Arjun Yadav

Active (before becoming defunct)

Codewars

Dec 13, 2022-present
Trying to practice different programming languages with Codewars (LeetCode is for harder, more Python-oriented problems).

Log

May 27, 2024-Sep 10, 2024 It's very annoying to log this particular project.
May 26, 2024 Finished Split String in Python:

def solution(s):
    res = []
    
    for i in range(0, len(s), 2):
        sub = s[i:i+2]
        res.append(sub)
    
    try:
        if len(res[-1]) == 1:
            res[-1] += "_"
    except:
        pass
    
    return res

Jan 29, 2023 Finished ISBN-10 Validation in Python:

def valid_ISBN10(isbn):
    if len(isbn) != 10:
        return False

    first_9 = isbn[:-1]
    last_digit = isbn[-1]

    total = 0

    try:
        total += sum([int(first_9[i]) * (i + 1) for i in range(len(first_9))])
    except:
        return False

    if last_digit.isdigit():
        total += int(last_digit) * 10
    elif last_digit == "X":
        total += 100
    else:
        return False

    return total % 11 == 0

Jan 28, 2023 Finished Mean Square Error in Python:

def solution(array_a, array_b):
    return sum((array_a[i] - array_b[i]) ** 2 for i in range(len(array_a))) / len(array_a)

Jan 27, 2023 Finished Find the unique number in Python:

def find_uniq(arr):
    return [i for i in set(arr) if arr.count(i) == 1][0]

Jan 25, 2023 Couldn't solve a problem today, but that's okay.
Jan 22, 2023 Finished First non-repeating character in Python:

def first_non_repeating_letter(string):
    for i in range(len(string)):
        if len([j for j in range(len(string)) if string[j].lower() == string[i].lower() and j != i]) == 0:
            return string[i]
    else:
        return ""

Jan 21, 2023 Finished Human Readable Time in Python:

def make_readable(seconds):
    hours = seconds // 3600
    minutes = (seconds - (hours * 3600)) // 60
    seconds_print = seconds - (minutes * 60) - (hours * 3600)

    if len(str(hours)) < 2:
        hours = "0" + str(hours)

    if len(str(minutes)) < 2:
        minutes = "0" + str(minutes)

    if len(str(seconds_print)) < 2:
        seconds_print = "0" + str(seconds_print)

    return f"{hours}:{minutes}:{seconds_print}"

Jan 20, 2023 Finished Pete, the baker in Python:

def cakes(recipe, available):
    count = 0
    max_scale = []

    for k, v in recipe.items():
        if k not in available:
            max_scale = [0]
        else:
            if available[k] < v:
                max_scale = [0]
            else:
                max_scale.append(available[k] // v)

    count = min(max_scale, default=0)
    return count

Jan 18, 2023 Still no luck.
Jan 17, 2023 Trying to solve Catching Car Mileage Numbers
Jan 16, 2023 Tried to solve a couple of problems in Python, but to no avail.
Jan 15, 2023 Finished Does my number look big in this? in Python:

def narcissistic(value):
    return sum([int(i) ** len(str(value)) for i in str(value)]) == value

Jan 04, 2023 Finished Simple Pig Latin in Python:

def pig_it(text):
    res = []

    for i in text.split(" "):
        if i.isalpha():
            word = i[1:] + i[0] + "ay"
            res.append(word)
        else:
            res.append(i)

    return " ".join(res)

Jan 03, 2023 Finished Count the smiley faces! in Python:

def count_smileys(arr):
    valid_smiley_faces = [':)', ';)', ':-)', ';-)', ':~)', ';~)', ':D', ';D', ':-D', ';-D', ':~D', ';~D', ':D', ';D']

    return len([i for i in arr if i in valid_smiley_faces])

Jan 02, 2023 Finished Are they the "same"? in Python:

def comp(array1, array2):
    if array1 == None or array2 == None:
        return False

    if sorted([i**2 for i in array1]) == sorted(array2):
        return True
    else:
        return False

Jan 01, 2023 Finished Moving Zeros To The End in Python:

def move_zeros(lst):
  return [i for i in lst if i != 0] + [i for i in lst if i == 0]

Dec 31, 2022 Finished (Multiplicative Persistence) in Python. Hoping to do more Java problems in 2023:

import math

def persistence(n):
    count = 0

    while len(str(n)) != 1:
        n = math.prod([int(i) for i in str(n)])
        count += 1

    return count

Dec 30, 2022 Finished Calculating with Functions in Python:

def zero(operand_num=""): #your code here
    return eval("0" + operand_num)
def one(operand_num=""): #your code here
    return eval("1" + operand_num)
def two(operand_num=""): #your code here
    return eval("2" + operand_num)
def three(operand_num=""): #your code here
    return eval("3" + operand_num)
def four(operand_num=""): #your code here
    return eval("4" + operand_num)
def five(operand_num=""): #your code here
    return eval("5" + operand_num)
def six(operand_num=""): #your code here
    return eval("6" + operand_num)
def seven(operand_num=""): #your code here
    return eval("7" + operand_num)
def eight(operand_num=""): #your code here
    return eval("8" + operand_num)
def nine(operand_num=""): #your code here
    return eval("9" + operand_num)

def plus(num): #your code here
    return f"+{num}"
def minus(num): #your code here
    return f"-{num}"
def times(num): #your code here
    return f"*{num}"
def divided_by(num): #your code here
    return f"//{num}"

Dec 29, 2022 Finished Break camelCase in Python:

def solution(s):
    res = ""

    for i in s:
        if ord(i) >= 65 and ord(i) <= 90:
            res += f" {i}"
        else:
            res += i

    return res

Dec 28, 2022 Finished Friend or Foe? in Python:

def friend(x):
	return [i for i in x if len(i) == 4]

Dec 27, 2022 Finished Sum of two lowest positive integers in Python:

def sum_two_smallest_numbers(numbers):
    return min(numbers) + min([i for i in numbers if i != min(numbers)])

Dec 26, 2022 Finished Highest and Lowest in Python:

def high_and_low(numbers):
    return f"{max([int(i) for i in numbers.split(' ')])} {min([int(i) for i in numbers.split(' ')])}"

Dec 25, 2022 Finished Decode the Morse code in Python:

from preloaded import MORSE_CODE

def decode_morse(morse_code):
    # Remember - you can use the preloaded MORSE_CODE dictionary:
    # For example:
    # MORSE_CODE['.-'] = 'A'
    # MORSE_CODE['--...'] = '7'
    # MORSE_CODE['...-..-'] = '$'
    temp_morse_code = morse_code.strip().split('   ')
    decoded_message = []

    for i in temp_morse_code:
        for j in i.split(' '):
            decoded_message.append(MORSE_CODE[j])
        decoded_message.append(" ")

    return "".join(decoded_message).rstrip()

Dec 24, 2022 Finished List Filtering in Python:

def filter_list(l):
    return [i for i in l if str(i).isdigit() and isinstance(i, int)]

Dec 23, 2022 Finished String ends with? in Python:

def solution(string, ending):
    if ending == '':
        return True
    else:
        if ending in string:
            if string[len(string) - len(ending):] == ending:
                return True
            else:
                return False
        else:
            return False

Dec 22, 2022 Finished Find the odd int in Java:

import java.util.ArrayList;

public class FindOdd {
	public static int findIt(int[] a) {
    ArrayList<Integer> count_al = new ArrayList<Integer>();

  	for (int i = 0; i < a.length; i++) {
      int number = a[i];
      int count = 0;

      for (int j = 0; j < a.length; j++) {
        if (a[j] == number) {
          count++;
        }
      }

      count_al.add(count);
    }

    for (int i = 0; i < count_al.size(); i++) {
      if (count_al.get(i) % 2 != 0) {
        return a[i];
      }
    }

    return 0;
  }
}

Dec 21, 2022 Finished Split Strings in Python (accidentally left the print statement in my final solution - oh well):

def solution(s):
    print(s)
    if len(s) % 2 != 0:
        temp_res = [s[i:i+2] for i in range(0, len(s), 2)]
        temp_res[-1] = temp_res[-1] + "_"
        return temp_res
    else:
        return [s[i:i+2] for i in range(0, len(s), 2)]

Dec 20, 2022 Finished Create Phone Number in Java:

public class Kata {
  public static String createPhoneNumber(int[] numbers) {
   String phoneNumber = "(" + String.valueOf(numbers[0]) + String.valueOf(numbers[1]) + String.valueOf(numbers[2]) + ") " + String.valueOf(numbers[3]) + String.valueOf(numbers[4]) + String.valueOf(numbers[5]) + "-" + String.valueOf(numbers[6]) + String.valueOf(numbers[7]) + String.valueOf(numbers[8]) + String.valueOf(numbers[9]);
   return phoneNumber;
  }
}

Dec 19, 2022 Finished Descending Order in Java:

import java.util.ArrayList;

public class DescendingOrder {
  public static int sortDesc(final int num) {
    int temp = num;
    ArrayList<Integer> digits = new ArrayList<Integer>();

    while (temp != 0) { // while loop for appending digits
      int digit = temp % 10;
      digits.add(digit);
      temp /= 10;
    }

    for (int i = 0; i < digits.size() - 1; i++) { // for loops for sorting - bubble sort
      for (int j = 0; j < digits.size() - 1 - i; j++) {
        if (digits.get(i + j + 1) > digits.get(i)) {
          int temp_digit = digits.get(i);
          digits.set(i, digits.get(i + j + 1));
          digits.set(i + j + 1, temp_digit);
        }
      }
    }

    int res = 0;

    for (int i = 0; i < digits.size(); i++) { // converting list of digits to int
      int digit = digits.get(i);
      res = (res * 10) + digit;
    }

    return res;
  }
}

Dec 18, 2022 Finished Stop gninnipS My sdroW! in Java:

import java.util.ArrayList;

public class SpinWords {

  public String spinWords(String sentence) {
    String[] words = sentence.split(" "); // credit - https://www.geeksforgeeks.org/split-string-java-examples/
    ArrayList<String> tempRes = new ArrayList<String>(); // creating a temp ArrayList for words

   for (int i = 0; i < words.length; i++) {
      if (words[i].length() >= 5) {
        String reverseString = "";

        for (int j = words[i].length() - 1; j >= 0; j--) { // inner for-loop for reversing the string
          reverseString += words[i].charAt(j);
        }

        tempRes.add(reverseString);

      } else {
        tempRes.add(words[i]);
      }
    }

    String res = String.join(" ", tempRes); // credit - https://stackoverflow.com/questions/599161/best-way-to-convert-an-arraylist-to-a-string

    return res;
  }
}

Dec 17, 2022 Finished Multiples of 3 or 5 in Java:

public class Solution {

  public int solution(int number) {
    if (number < 0) {
      return -1; // returning -1 if the number is negative
    } else {
      int res = 0;

      for (int i = 1; i < number; i++) {
        if (i % 3 == 0 || i % 5 == 0) { // only counting the number once if multiple of 15
          res += i;
        }
      }

      return res;
    }
  }
}

Dec 16, 2022 Finished Mumbling in Java:

public class Accumul {

    public static String accum(String s) {
      String res = ""; // result string

      for (int i = 0; i < s.length(); i++) {
        char chr = s.charAt(i); // getting character at each index
        res += Character.toUpperCase(chr); // converting character to uppercase

        for (int j = 0; j < i; j++) {
          char chr_repeat = s.charAt(i); // repeatedly getting the same character based on index
          res += Character.toLowerCase(chr_repeat); // converting character to lowercase
        }

        if (i != s.length() - 1) { // as long as not last character, add hyphen
          res += "-";
        }
      }

      return res;
    }
}

Dec 15, 2022 Finished Is this a triangle? in JavaScript:

function isTriangle(a, b, c) {
  if (a + b > c && b + c > a && a + c > b) return true;
  else return false;
}

Dec 14, 2022 Finished Vowel Count in JavaScript:

function getCount(str) {
  let count = 0;
  for (let i = 0; i < str.length; i++) {
    if (
      str[i] == "a" ||
      str[i] == "e" ||
      str[i] == "i" ||
      str[i] == "o" ||
      str[i] == "u"
    )
      count++;
  }
  return count;
}

Dec 13, 2022 Finished a couple of different problems (?) and got to 8 kyu.

LeetCode

Nov 13, 2021-present
Trying to do a problem every day. All of the general problems are done in Python.

Log

Jun 06, 2024-Jul 26, 2024 Loads of problems.
Jun 05, 2024 Finished Longest Palindrome:

class Solution:
    def longestPalindrome(self, s: str) -> int:
        # Credit - https://leetcode.com/problems/longest-palindrome/solutions/5255543/python3-solution
        c = Counter(s)
        ans = 0

        for i in c.values():
            ans += int(i/2)*2
            if ans%2 == 0 and i%2 == 1:
                ans += 1
                
        return ans

May 28, 2024 Finished Minimum Number of Moves to Seat Everyone:

class Solution:
    def minMovesToSeat(self, seats: List[int], students: List[int]) -> int:
        # Credit - https://leetcode.com/problems/minimum-number-of-moves-to-seat-everyone/submissions/1270074368
        
        total = 0

        seats.sort()
        students.sort()

        for i in range(len(students)):
            total += abs(students[i] - seats[i])

        return total

May 26, 2024 Finished Find the Number of Good Pairs I:

class Solution:
    def numberOfPairs(self, nums1: List[int], nums2: List[int], k: int) -> int:
        count = 0

        for i in nums1:
            for j in nums2:
                if i % (j * k) == 0:
                    count += 1
        
        return count

May 25, 2024 Finished Find the XOR of Numbers Which Appear Twice:

class Solution:
    def duplicateNumbersXOR(self, nums: List[int]) -> int:
        # Credit - https://leetcode.com/problems/find-the-xor-of-numbers-which-appear-twice/solutions/5206859/easy-solution-contest-25-05-2024
        
        result = 0
        for num, count in Counter(nums).items():
            if count == 2:
                result ^= num
        return result

May 21, 2024 Finished Subsets:

class Solution:
    def subsets(self, nums: List[int]) -> List[List[int]]:
        # Credit - https://leetcode.com/problems/subsets/solutions/5186387/fastest-100-easy-to-understand
         result = []

        def explore(index, curr):
            if index == len(nums):
                result.append(curr.copy())
                return

            curr.append(nums[index])
            explore(index + 1, curr)
            curr.pop()
            explore(index + 1, curr)

        explore(0, [])
        return result

May 19, 2024 Finished Special Array I:

class Solution:
    def isArraySpecial(self, nums: List[int]) -> bool:
        if len(nums) == 1:
            return True
        else:
            for i in range(len(nums) - 1):
                if nums[i+1] % 2 == 0 and nums[i] % 2 == 0:
                    return False
                elif nums[i+1] % 2 != 0 and nums[i] % 2 != 0:
                    return False
        return True

May 12, 2024 Finished Check if Grid Satisfies Conditions:

class Solution:
    def satisfiesConditions(self, grid: List[List[int]]) -> bool:
        for i in range(len(grid)):
            for j in range(len(grid[i])):
                if i != len(grid) - 1:
                    if grid[i][j] != grid[i + 1][j]:
                        return False
                if j != len(grid[i]) - 1:
                    if grid[i][j] == grid[i][j + 1]:
                        return False
        return True

May 09, 2024 Finished Make Three Strings Equal:

class Solution:
    def findMinimumOperations(self, s1: str, s2: str, s3: str) -> int:
        # Credit - https://leetcode.com/problems/make-three-strings-equal/solutions/4305578/beats-100-users-by-speed-and-memory-by-prodonik-java-c-c-python-ruby
        
        lengths = [len(s1), len(s2), len(s3)]
        minimum_length = min(lengths)
        count = 0
        for i in range(minimum_length):
            if s1[i] == s2[i] == s3[i]:
                count += 1
            else:
                break
        if count == 0:
            return -1
        result = sum(length - count for length in lengths)
        return result

May 05, 2024 Finished Valid Word:

class Solution:
    def isValid(self, word: str) -> bool:
        if len(word) >= 3:
            for i in word:
                if i.isalnum() == False:
                    return False
            
            for i in word:
                if i.isalpha():
                    if i in "aeiouAEIOU":
                        for j in word:
                            if j.isalpha():
                                if j not in "aeiouAEIOU":
                                    return True
        
        return False

May 03, 2024 Finished Array Reduce Transformation:

/**
 * @param {number[]} nums
 * @param {Function} fn
 * @param {number} init
 * @return {number}
 */
var reduce = function(nums, fn, init) {
    return nums.reduce(fn, init);
};

May 01, 2024 Finished Reverse Prefix of Word:

class Solution:
    def reversePrefix(self, word: str, ch: str) -> str:
        import re
        
        if re.findall(f"[a-zA-Z]*{ch}[a-zA-Z]*", word) == []:
            return word
        
        count = 0
        
        for i in word:
            count += 1
            if i == ch:
                tempRes = word[0:count]
                return tempRes[::-1] + word[count:len(word)]

Apr 30, 2024 Finished Valid Phone Numbers:

# Read from the file file.txt and output all valid phone numbers to stdout.
grep -e "^[0-9]\{3\}\-[0-9]\{3\}\-[0-9]\{4\}$" -e "^([0-9]\{3\}) [0-9]\{3\}\-[0-9]\{4\}$" file.txt

Apr 29, 2024 Finished Find the Integer Added to Array I:

class Solution:
    def addedInteger(self, nums1: List[int], nums2: List[int]) -> int:
        return sorted(nums2)[0] - sorted(nums1)[0]

Apr 26, 2024 Finished Reshape the Matrix:

class Solution:
    def matrixReshape(self, mat: List[List[int]], r: int, c: int) -> List[List[int]]:
        import numpy as np
        try:
            return np.array(mat).reshape((r, c)).tolist()
        except:
            return mat

Apr 25, 2024 Finished Calculate Amount Paid in Taxes:

class Solution:
    def calculateTax(self, brackets: List[List[int]], income: int) -> float:
        tax = 0

        for i in range(len(brackets)):
            if i == 0:
                amount_taxed = brackets[i][0]
                if amount_taxed <= income:
                    tax += amount_taxed * (brackets[i][1]/100)
                    income -= amount_taxed
                else:
                    tax += income * (brackets[i][1]/100)
                    income = 0
            else:
                amount_taxed = brackets[i][0] - brackets[i-1][0]
                if amount_taxed <= income:
                    tax += amount_taxed * (brackets[i][1]/100)
                    income -= amount_taxed
                else:
                    tax += income * (brackets[i][1]/100)
                    income = 0

        return tax

Apr 23, 2024 Finished Sort By:

/**
 * @param {Array} arr
 * @param {Function} fn
 * @return {Array}
 */
var sortBy = function (arr, fn) {
  return arr.sort((a, b) => fn(a) - fn(b));
};

Apr 22, 2024 Finished Transpose File:

# Read from the file file.txt and print its transposed content to stdout.

# Credit - https://leetcode.com/problems/transpose-file/solutions/4550818/transposed

awk '
{
    for (i = 1; i <= NF; i++) {
        if (NR == 1) {
            matrix[i] = $i;
        } else {
            matrix[i] = matrix[i] " " $i;
        }
    }
}
END {
    for (i = 1; i <= NF; i++) {
        print matrix[i];
    }
}' file.txt

Apr 21, 2024 Finished Count the Number of Special Characters I:

class Solution:
    def numberOfSpecialChars(self, word: str) -> int:
        count = 0

        for i in list(dict.fromkeys(word.upper())):
            if i.lower() in word and i.upper() in word:
                count += 1

        return count

Apr 18, 2024 Finished Distribute Elements Into Two Arrays I:

class Solution:
    def resultArray(self, nums: List[int]) -> List[int]:
        arr1 = [nums[0]]
        arr2 = [nums[1]]

        for i in range(2, len(nums)):
            if arr1[-1] > arr2[-1]:
                arr1.append(nums[i])
            else:
                arr2.append(nums[i])

        return arr1 + arr2

Apr 17, 2024 Finished Score of a String:

class Solution:
    def scoreOfString(self, s: str) -> int:
        res = 0
        for i in range(1, len(s)):
            res += abs(ord(s[i]) - ord(s[i-1]))
        return res

Apr 15, 2024 Finished Latest Time You Can Obtain After Replacing Characters:

class Solution:
    def findLatestTime(self, s: str) -> str:
        new_str = ""
        flag = False

        for i in range(len(s)):
            if s[i] == "?":
                if i == 0:
                    if s[1] == "?" and flag == False:
                        new_str += "11"
                        flag = True
                    elif int(s[1]) < 2 and flag == False:
                        new_str += "1"
                    elif flag == False:
                        new_str += "0"
                elif i == 1:
                    if s[0] == "?" and flag == False:
                        new_str += "11"
                        flag = True
                    elif s[0] == "1" and flag == False:
                        new_str += "1"
                    elif flag == False:
                        new_str += "9"
                elif i == 4:
                    new_str += "9"
                elif i == 3:
                    new_str += "5"
            else:
                new_str += s[i]

        return new_str

Apr 09, 2024 Finished Time Needed to Buy Tickets:

class Solution:
    def timeRequiredToBuy(self, tickets: List[int], k: int) -> int:
        # Credit - https://leetcode.com/problems/time-needed-to-buy-tickets/solutions/4996426/simple-while-loop

        time = 0
        i = 0

        while tickets[k] != 0 :
            if i == len(tickets):
                i = 0

            if tickets[i] != 0:
                time += 1
                tickets[i] -= 1

            i += 1

        return time

Apr 08, 2024 Finished Number of Students Unable to Eat Lunch:

class Solution:
    def countStudents(self, students: List[int], sandwiches: List[int]) -> int:
        count = 0

        while len(students) > 0 and count < 300:
            sandwich = sandwiches[0]
            student = students[0]

            if student == sandwich:
                sandwiches = sandwiches[1:]
                students = students[1:]
            else:
                students = students[1:] + [students[0]]

            count += 1

        return len(students)

Apr 06, 2024 Finished Harshad Number:

class Solution:
    def sumOfTheDigitsOfHarshadNumber(self, x: int) -> int:
        if x % sum([int(i) for i in list(str(x))]) == 0:
            return sum([int(i) for i in list(str(x))])
        else:
            return -1

Apr 05, 2024 Finished Make The String Great:

class Solution:
    def makeGood(self, s: str) -> str:
        def check():
            for i in range(len(s)-1):
                if s[i].swapcase() == s[i+1] or s[i] == s[i+1].swapcase():
                    return True

        while check():
            for i in range(len(s)-1):
                if s[i].swapcase() == s[i+1] or s[i] == s[i+1].swapcase():
                    s = s[:i] + s[i+2:]
                    break

        return s

Apr 04, 2024 Finished Maximum Nesting Depth of the Parentheses:

class Solution:
    def maxDepth(self, s: str) -> int:
        depth = 0
        depths = []

        for i in s:
            if i == "(":
                depth += 1
                depths.append(depth)
            elif i == ")":
                depth -= 1
            else:
                depths.append(depth)

        return max(depths, default=1)

Apr 02, 2024 Finished Isomorphic Strings:

class Solution:
    def isIsomorphic(self, s: str, t: str) -> bool:
        # Credit - https://leetcode.com/problems/isomorphic-strings/solutions/4959995/beat-99-easy
        return len(set(zip(s,t))) == len(set(s)) == len(set(t))

Mar 27, 2024 Finished Maximum Number of Pairs in Array:

class Solution:
    def numberOfPairs(self, nums: List[int]) -> List[int]:
        # Credit - https://leetcode.com/problems/maximum-number-of-pairs-in-array/solutions/2459648/python-easy-solution

        res = []
        pair = 0
        unique = list(set(nums))

        for i in range(len(unique)):
            count = nums.count(unique[i])
            if count % 2 != 0:
                res.append(unique[i])
            pair += (count) // 2

        return [pair,len(res)]

Mar 19, 2024 Finished Count Substrings Starting and Ending with Given Character:

class Solution:
    def countSubstrings(self, s: str, c: str) -> int:
        return s.count(c)*(s.count(c)+1)//2

Mar 17, 2024 Finished Find the Sum of Encrypted Integers:

class Solution:
    def sumOfEncryptedInt(self, nums: List[int]) -> int:
        def encrypt(num):
            n = str(num)
            l = len(n)

            return int(str(max([int(i) for i in n])) * l)

        return sum([encrypt(i) for i in nums])

Mar 16, 2024 Finished Apple Redistribution into Boxes:

class Solution:
    def minimumBoxes(self, apple: List[int], capacity: List[int]) -> int:
        # Credit - https://leetcode.com/problems/apple-redistribution-into-boxes/solutions/4851129/easy-python-solution

        count = 0
        temp = 0
        capacity.sort(reverse=True)

        for i in capacity:
            temp += i
            count += 1

            if temp >= sum(apple):
                return count

        return count

Mar 15, 2024 Finished Product of Array Except Self:

class Solution:
    def productExceptSelf(self, nums: List[int]) -> List[int]:
        # Credit - https://leetcode.com/problems/product-of-array-except-self/solutions/4876999/prefix-suffix-products-o-1-extra-space-3ms-beats-99-89
        a = [1]*len(nums)
        for i in range(len(nums)-2, -1, -1):
            a[i] = nums[i+1] * a[i+1]
        b = 1

        for j in range(1,len(nums)):
            b *= nums[j-1]
            a[j] *= b
        return a

Mar 07, 2024 Finished Middle of the Linked List:

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def middleNode(self, head: Optional[ListNode]) -> Optional[ListNode]:
        # https://leetcode.com/problems/middle-of-the-linked-list/solutions/4835201/easy-code-with-100-beats-with-c-beginner-friendly

        count = 0
        ptr = head
        while ptr is not None:
            count += 1
            ptr = ptr.next

        ptr = head
        for i in range(count // 2):
            ptr = ptr.next

        return ptr

Mar 03, 2024 Finished Minimum Operations to Exceed Threshold Value I:

class Solution:
    def minOperations(self, nums: List[int], k: int) -> int:
        count = 0

        while False in [i >= k for i in nums]:
            nums.remove(min(nums))
            count += 1

        return count

Feb 25, 2024 Finished Even Odd Tree:

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def isEvenOddTree(self, root: Optional[TreeNode]) -> bool:
        def traverse(tree, lvl):
            if tree:
                if lvl >= len(li):
                    lst = []
                    li.append(lst)

                li[lvl].append(tree.val)
                traverse(tree.left, lvl+1)
                traverse(tree.right, lvl+1)

        li = []
        traverse(root, 0)

        print(li)

        for i in range(len(li)):
            if i % 2 == 0:
                for j in li[i]:
                    if j % 2 == 0:
                        return False
                if not all(i < j for i, j in zip(li[i], li[i][1:])):
                    return False
            else:
                for j in li[i]:
                    if j % 2 != 0:
                        return False
                if not all(i > j for i, j in zip(li[i], li[i][1:])):
                    return False

        return True

Feb 25, 2024 Finished Split the Array:

class Solution:
    def isPossibleToSplit(self, nums: List[int]) -> bool:
        for i in set(nums):
            if nums.count(i) > 2:
                return False
        return True

Feb 21, 2024 Finished Bitwise AND of Numbers Range:

class Solution:
    def rangeBitwiseAnd(self, left: int, right: int) -> int:
        # Credit - https://leetcode.com/problems/bitwise-and-of-numbers-range/solutions/4759869/beat-100-bitwise-operation

        shift = 0
        while left < right:
            left >>= 1
            right >>= 1
            shift += 1
        return left << shift

Feb 18, 2024 Finished Count Prefix and Suffix Pairs I:

class Solution:
    def countPrefixSuffixPairs(self, words: List[str]) -> int:
        # Credit - https://leetcode.com/problems/count-prefix-and-suffix-pairs-i/solutions/4744481/simple-and-easy-to-understand-python

        def isPrefixAndSuffix(presuf, word):
            return word[:len(presuf)] == presuf and word[-len(presuf):] == presuf

        count = 0

        for i in range(len(words) - 1):
            for j in range(i+1, len(words)):
                count += isPrefixAndSuffix(words[i],words[j])

        return count

Feb 10, 2024 Finished Modify the Matrix:

class Solution:
    def modifiedMatrix(self, matrix: List[List[int]]) -> List[List[int]]:
        transpose = []

        for i in range(len(matrix[0])):
            col = []

            for j in range(len(matrix)):
                col.append(matrix[j][i])

            transpose.append(col)

        print(transpose)

        for i in range(len(matrix)):
            for j in range(len(matrix[0])):
                if matrix[i][j] == -1:
                    matrix[i][j] = max(transpose[j])

        return matrix

Feb 09, 2024 Finished Ant on the Boundary:

class Solution:
    def returnToBoundaryCount(self, nums: List[int]) -> int:
        sum = 0
        count = 0

        for i in nums:
            sum += i
            if sum == 0:
                count += 1

        return count

Feb 08, 2024 Finished Type of Triangle II:

class Solution:
    def triangleType(self, nums: List[int]) -> str:
        def check(li):
            if li[0] + li[1] > li[2] and li[0] + li[2] > li[1] and li[1] + li[2] > li[0]:
                return True
            else:
                return False

        if check(nums):
            if len(set(nums)) == 1:
                return "equilateral"
            elif len(set(nums)) == 2:
                return "isosceles"
            else:
                return "scalene"
        else:
            return "none"

Feb 03, 2024 Finished Word Frequency:

# Read from the file words.txt and output the word frequency list to stdout.
# Credit - https://leetcode.com/problems/word-frequency/solutions/4586376/perfect
cat words.txt | tr -s ' ' '\n' | sort | uniq -c | sort -nr | awk '{print $2, $1}'

Feb 02, 2024 Finished Check Array Formation Through Concatenation:

class Solution:
    def canFormArray(self, arr: List[int], pieces: List[List[int]]) -> bool:
        for i in pieces:
            n = len(i)
            if i not in list((arr[j:j + n] for j in range(0, len(arr) - (n - 1)))):
                return False
        return True

Jan 28, 2024 Finished Number of Changing Keys:

class Solution:
    def countKeyChanges(self, s: str) -> int:
        s = s.lower()
        count = 0

        for i in range(1, len(s)):
            if s[i] != s[i - 1]:
                count += 1

        return count

Jan 27, 2024 Finished Check if Binary String Has at Most One Segment of Ones:

class Solution:
    def checkOnesSegment(self, s: str) -> bool:
        if len([i for i in s.split('0') if i != '']) > 1:
            return False
        return True

Jan 26, 2024 Finished Find Center of Star Graph:

class Solution:
    def findCenter(self, edges: List[List[int]]) -> int:

        # Credit - https://leetcode.com/problems/find-center-of-star-graph/solutions/4534529/beginner-friendly

        temp = defaultdict(list)

        for i in edges:
            temp[i[0]].append(i[1])
            temp[i[1]].append(i[0])

        for i, j in temp.items():
            if len(j) == len(temp) - 1:
                return i

Jan 16, 2024 Finished Insert Delete GetRandom O(1):

import random

class RandomizedSet:

    def __init__(self):
        self.list = []


    def insert(self, val: int) -> bool:
        if val in self.list:
            return False
        else:
            self.list.append(val)
            return True

    def remove(self, val: int) -> bool:
        if val not in self.list:
            return False
        else:
            self.list.remove(val)
            return True


    def getRandom(self) -> int:
        return self.list[random.randrange(0, len(self.list))]

# Your RandomizedSet object will be instantiated and called as such:
# obj = RandomizedSet()
# param_1 = obj.insert(val)
# param_2 = obj.remove(val)
# param_3 = obj.getRandom()

Jan 15, 2024 Finished Count Elements With Maximum Frequency:

class Solution:
    def maxFrequencyElements(self, nums: List[int]) -> int:
        max_count = max([nums.count(i) for i in nums])
        total = 0

        for i in nums:
            if nums.count(i) == max_count:
                total += 1

        return total

Jan 12, 2024 Finished Drop Duplicate Rows:

import pandas as pd

def dropDuplicateEmails(customers: pd.DataFrame) -> pd.DataFrame:
    return customers.drop_duplicates(subset = ['email'])

Jan 10, 2024 Finished Maximum Area of Longest Diagonal Rectangle:

class Solution:
    def areaOfMaxDiagonal(self, dimensions: List[List[int]]) -> int:
        diagonal = sqrt(max(dimensions, key=lambda x: sqrt((x[0] ** 2) + (x[1] ** 2)))[0] ** 2 + max(dimensions, key=lambda x: sqrt((x[0] ** 2) + (x[1] ** 2)))[1] ** 2)

        max_area = 0

        for i in dimensions:
            if sqrt(i[0] ** 2 + i[1] ** 2) == diagonal:
                if i[0] * i[1] > max_area:
                    max_area = i[0] * i[1]

        return max_area

Jan 07, 2024 Finished Smallest Missing Integer Greater Than Sequential Prefix Sum:

class Solution:
    def missingInteger(self, nums: List[int]) -> int:
        count = nums[0]

        for i in range(1, len(nums)):
            if nums[i] == nums[i-1] + 1:
                count += nums[i]
            else:
                break

        while True:
            if count not in nums:
                return count
            else:
                count += 1

Jan 06, 2024 Finished Reshape Data: Melt:

import pandas as pd

def meltTable(report: pd.DataFrame) -> pd.DataFrame:
    return pd.melt(report, id_vars=['product'], value_vars=['quarter_1', 'quarter_2', 'quarter_3', 'quarter_4'], var_name='quarter', value_name='sales')

Jan 05, 2024 Finished Reshape Data: Pivot:

import pandas as pd

def pivotTable(weather: pd.DataFrame) -> pd.DataFrame:
    # Credit - https://leetcode.com/problems/reshape-data-pivot/solutions/4141086/line-by-line-explanation-easy-solution-beginner-friendly-pandas
    return weather.pivot_table(index='month', columns='city', values='temperature', aggfunc='max')

Jan 03, 2024 Finished Check if Bitwise OR Has Trailing Zeros:

class Solution:
    def hasTrailingZeros(self, nums: List[int]) -> bool:
        for i in range(len(nums)):
            for j in range(i+1, len(nums)):
                if str(bin(nums[i] | nums[j]))[-1] == "0":
                    return True
        return False

Jan 01, 2024 Finished Largest Substring Between Two Equal Characters:

class Solution:
    def maxLengthBetweenEqualCharacters(self, s: str) -> int:
        lengths = []

        for i in range(len(s)):
            for j in range(len(s)):
                if s[i] == s[j]:
                    lengths.append(j - i - 1)

        return max(lengths, default=-1)

Dec 31, 2023 Finished Largest Substring Between Two Equal Characters, happy new year in advance!

class Solution:
    def maxLengthBetweenEqualCharacters(self, s: str) -> int:
        lengths = []

        for i in range(len(s)):
            for j in range(len(s)):
                if s[i] == s[j]:
                    lengths.append(j - i - 1)

        return max(lengths, default=-1)

Dec 30, 2023 Finished Redistribute Characters to Make All Strings Equal:

class Solution:
    def makeEqual(self, words: List[str]) -> bool:
        if len(words) == 1:
            return True

        chars = set("".join(words))

        for char in chars:
            if "".join(words).count(char) % len(words) != 0:
                return False

        return True

Dec 29, 2023 Finished Reshape Data: Concatenate:

import pandas as pd

def concatenateTables(df1: pd.DataFrame, df2: pd.DataFrame) -> pd.DataFrame:
    return pd.concat([df1, df2], ignore_index=True, sort=False)

Dec 28, 2023 Finished Fill Missing Data:

import pandas as pd

def fillMissingValues(products: pd.DataFrame) -> pd.DataFrame:
    products["quantity"].fillna(0, inplace=True)
    return products

Dec 27, 2023 Finished Change Data Type:

import pandas as pd

def changeDatatype(students: pd.DataFrame) -> pd.DataFrame:
    students['grade'] = students['grade'].astype(int)
    return students

Dec 26, 2023 Finished Count the Number of Incremovable Subarrays I:

class Solution:
    def incremovableSubarrayCount(self, nums: List[int]) -> int:
        count = 1

        for i in range(len(nums)):
            for j in range(len(nums)):
                if j>=i:
                    remainder = nums[:i] + nums[j+1:]
                    if len(remainder) > 0 and all(i < j for i, j in zip(remainder, remainder[1:])):
                        count += 1

        return count

Dec 25, 2023 Finished Minimum Number Game

class Solution:
    def numberGame(self, nums: List[int]) -> List[int]:
        arr = []
        nums.sort()

        while len(nums) > 0:
            al = nums.pop()
            bo = nums.pop()

            arr.extend([bo, al])

        return arr[::-1]

Dec 22, 2023 Finished Maximum Score After Splitting a String:

class Solution:
    def maxScore(self, s: str) -> int:
        return max([s[:i].count('0') + s[i:].count('1') for i in range(1, len(s))])

Dec 21, 2023 Finished Rename Columns:

import pandas as pd

def renameColumns(students: pd.DataFrame) -> pd.DataFrame:
    students.rename(columns={'id': 'student_id', 'first': 'first_name', 'last': 'last_name', 'age': 'age_in_years'}, inplace=True)
    return students

Dec 19, 2023 Finished Drop Missing Data:

import pandas as pd

def dropMissingData(students: pd.DataFrame) -> pd.DataFrame:
    students.drop(students[students['name'].isnull()].index, inplace = True)
    return students

Dec 16, 2023 Finished Find Common Elements Between Two Arrays:

class Solution:
    def findIntersectionValues(self, nums1: List[int], nums2: List[int]) -> List[int]:
        return [len([i for i in nums1 if i in nums2]), len([i for i in nums2 if i in nums1])]

Dec 06, 2023 Finished Calculate Money in Leetcode Bank:

class Solution:
    def totalMoney(self, n: int) -> int:
        total = 0
        lastMonday = 1
        j = 1

        for i in range(n):
            if i> 0 and i % 7 == 0:
                lastMonday += 1
                total += lastMonday
                j = lastMonday + 1
            else:
                total += j
                j += 1

        return total

Dec 04, 2023 Finished Find the Peaks:

class Solution:
    def findPeaks(self, mountain: List[int]) -> List[int]:
        peaks = []

        for i in range(1, len(mountain)-1):
            if mountain[i-1] < mountain[i] and mountain[i] > mountain[i+1]:
                peaks.append(i)

        return peaks

Dec 03, 2023 Finished Sum in a Matrix:

class Solution:
    def matrixSum(self, nums: List[List[int]]) -> int:
        count = len(nums[0])
        score = 0

        while count > 0:
            numbers = []

            for i in range(len(nums)):
                numbers.append(max(nums[i]))
                nums[i].remove(max(nums[i]))

            score += max(numbers)
            count -= 1

        return score

Nov 30, 2023 Finished Modify Columns:

import pandas as pd

def modifySalaryColumn(employees: pd.DataFrame) -> pd.DataFrame:
    employees['salary'] = employees['salary'] * 2
    return employees

Nov 29, 2023 Finished Count Beautiful Substrings I:

class Solution:
    def beautifulSubstrings(self, s: str, k: int) -> int:
        # Credit - https://leetcode.com/problems/count-beautiful-substrings-i/solutions/4330501/readable-python-solution/

        beautiful_count = 0
        vowels_list = ['a','e','i','o','u']

        for i in range(len(s)):
            vowels, consonants = 0 , 0
            j = i
            while j < len(s):
                if s[j] in vowels_list:
                    vowels += 1
                else:
                    consonants += 1
                if vowels == consonants and (vowels * consonants) % k == 0:
                    beautiful_count += 1
                j += 1
        return beautiful_count

Nov 28, 2023 Finished Matrix Similarity After Cyclic Shifts:

class Solution:
    def areSimilar(self, mat: List[List[int]], k: int) -> bool:
        # Credit - https://leetcode.com/problems/matrix-similarity-after-cyclic-shifts/solutions/4330359/python-easy-solution/

        k %= len(mat[0])

        for m in mat:
            if m != m[k:] + m[:k]:
                return False

        return True

Nov 26, 2023 Finished Find Words Containing Character:

class Solution:
    def findWordsContaining(self, words: List[str], x: str) -> List[int]:
        return [i for i in range(len(words)) if x in words[i]]

Nov 25, 2023 Finished Rearrange Products Table:

# Write your MySQL query statement below

# Credit - https://leetcode.com/problems/rearrange-products-table/solutions/3853137/simple-mysql-solution-using-union/

SELECT product_id, 'store1' AS store, store1 AS price FROM Products WHERE store1 IS NOT NULL
UNION
SELECT product_id, 'store2' AS store, store2 AS price FROM Products WHERE store2 IS NOT NULL
UNION
SELECT product_id, 'store3' AS store, store3 AS price FROM Products WHERE store3 IS NOT NULL;

Nov 24, 2023 Tried to finish Difference Between Ones and Zeros in Row and Columnhttps://leetcode.com/problems/difference-between-ones-and-zeros-in-row-and-column:

class Solution:
    def onesMinusZeros(self, grid: List[List[int]]) -> List[List[int]]:
        import numpy as np

        grid = np.array(grid)
        diff = []

        for i in range(len(grid)):
            arr = []
            for j in range(len(grid[0])):
                arr.append(np.sum(grid[i]) + np.sum(grid[:, j]) - np.sum(1 - grid[i]) - np.sum(1 - grid[:, j]))
            diff.append(arr)

        return diff

Nov 22, 2023 Finished Market Analysis I:

# Write your MySQL query statement below

# Credit - https://leetcode.com/problems/market-analysis-i/solutions/2319471/simple-in-depth-explanation-of-where-and-is-null/

SELECT u.user_id as buyer_id, u.join_date, COUNT(o.order_id) AS orders_in_2019 FROM Users u LEFT JOIN Orders o ON o.buyer_id = u.user_id AND YEAR(order_date) = '2019' GROUP BY u.user_id;

Nov 21, 2023 Finished User Activity for the Past 30 Days I:

# Write your MySQL query statement below
SELECT activity_date AS day, COUNT(DISTINCT user_id) as active_users FROM Activity GROUP BY day HAVING COUNT(DISTINCT user_id) > 0 AND day >= '2019-06-28' AND day <= '2019-07-27';

Nov 20, 2023 Finished Find Total Time Spent by Each Employee:

# Write your MySQL query statement below
SELECT DISTINCT event_day as day, emp_id, (SELECT SUM(out_time - in_time) FROM Employees WHERE event_day = e.event_day and emp_id = e.emp_id) as total_time FROM Employees e;

Nov 17, 2023 Finished [Number of Valid Words in a Sentence](https://leetcode.com/problems number-of-valid-words-in-a-sentence/):

class Solution:
    def countValidWords(self, sentence: str) -> int:
        count = 0

        for i in sentence.split():
            if i.count('-') <= 1:
                if i[-1].isalpha() or i[-1] == "!" or i[-1] == ',' or i[-1] == ".":
                    letter_count = 0
                    for j in range(len(i) - 1):
                        if i[j].isalpha():
                            letter_count += 1
                        elif i[j] == "-":
                            if j != 0 and j != len(i) - 1:
                                if i[j-1].isalpha() and i[j+1].isalpha():
                                    letter_count += 1

                    if letter_count == len(i) - 1:
                        count += 1

        return count

Nov 12, 2023 Finished Maximum Strong Pair XOR I:

class Solution:
    def maximumStrongPairXor(self, nums: List[int]) -> int:
        max = 0

        for i in range(len(nums)):
            for j in range(len(nums)):
                if abs(nums[i] - nums[j]) <= min(nums[i], nums[j]):
                    if nums[i]^nums[j] >= max:
                        max = nums[i]^nums[j]

        return max

Nov 06, 2023 Finished Find Champion I:

class Solution:
    def findChampion(self, grid: List[List[int]]) -> int:
        max_ones = max([i.count(1) for i in grid])

        for i in range(len(grid)):
            if grid[i].count(1) == max_ones:
                return i

Nov 05, 2023 Finished Method Chaining:

import pandas as pd

def findHeavyAnimals(animals: pd.DataFrame) -> pd.DataFrame:
    animals = animals[animals['weight'] > 100]
    animals.sort_values(by=['weight'], inplace=True, ascending=False)

    del animals['species']
    del animals['age']
    del animals['weight']

    return animals

Nov 04, 2023 Finished Create a New Column:

import pandas as pd

def createBonusColumn(employees: pd.DataFrame) -> pd.DataFrame:
    employees['bonus'] = [i*2 for i in employees['salary']]

    return employees

Nov 03, 2023 Finished Find the K-or of an Array:

class Solution:
    def findKOr(self, nums: List[int], k: int) -> int:
        # Credit - https://leetcode.com/problems/find-the-k-or-of-an-array/solutions/4220565/python-simple-solution/
        res = 0

        for i in range(32):
            count = 0
            n = 2**i

            for num in nums:
                if num & n:
                    count += 1

            if count >= k:
                res += n

        return res

Oct 29, 2023 Finished Subarrays Distinct Element Sum of Squares I:

class Solution:
    def sumCounts(self, nums: List[int]) -> int:
        total = 0

        for i in range(len(nums)):
            for j in range(len(nums)+1):
                total += (len(set(nums[i:j])))**2

        return total

Oct 28, 2023 Finished Select Data:

import pandas as pd

def selectData(students: pd.DataFrame) -> pd.DataFrame:
    return students[students["student_id"] == 101].loc[:, students.columns != 'student_id']

Oct 27, 2023 Finished Display the First Three Rows:

import pandas as pd

def selectFirstRows(employees: pd.DataFrame) -> pd.DataFrame:
    return employees.head(3)

Oct 17, 2023 Finished Find Indices With Index and Value Difference I:

class Solution:
    def findIndices(self, nums: List[int], indexDifference: int, valueDifference: int) -> List[int]:
        for i in range(len(nums)):
            for j in range(len(nums)):
                if abs(i - j) >= indexDifference and abs(nums[i] - nums[j]) >= valueDifference:
                    return [i, j]

        return [-1, -1]

Oct 15, 2023 Finished Last Visited Integers:

class Solution:
    def lastVisitedIntegers(self, words: List[str]) -> List[int]:
        integers = []
        res = []
        count = 0

        for i in words:
            if i == "prev":
                count += 1
                temp = integers[::-1]
                if count <= len(integers):
                    res.append(temp[count - 1])
                else:
                    res.append(-1)
            else:
                count = 0
                integers.append(int(i))

        return res

Oct 13, 2023 Finished Divisible and Non-divisible Sums Difference:

class Solution:
    def differenceOfSums(self, n: int, m: int) -> int:
        return sum([i for i in range(1, n+1) if i % m != 0]) - sum([i for i in range(1, n+1) if i % m == 0])

Oct 12, 2023 Finished Get the Size of a DataFrame:

import pandas as pd

def getDataframeSize(players: pd.DataFrame) -> List[int]:
    return [len(players.axes[0]), len(players.axes[1])]

Oct 08, 2023 Finished Maximum Value of an Ordered Triplet I:

class Solution:
    def maximumTripletValue(self, nums: List[int]) -> int:
        max_value = 0

        for i in range(len(nums)):
            for j in range(i+1, len(nums)):
                for k in range(j+1, len(nums)):
                    if ((nums[i] - nums[j]) * nums[k]) > max_value:
                        max_value = ((nums[i] - nums[j]) * nums[k])

        return max_value

Oct 07, 2023 Finished Minimum Operations to Collect Elements:

class Solution:
    def minOperations(self, nums: List[int], k: int) -> int:
        def check(k, arr):
            for i in range(1, k+1):
                if i not in arr:
                    return False

            return True

        collection = []
        count = 0

        while not check(k, collection):
            collection.append(nums[-1])
            nums = nums[:-1]
            count += 1

        return count

Sep 25, 2023 Finished Check If All 1's Are at Least Length K Places Away:

class Solution:
    def kLengthApart(self, nums: List[int], k: int) -> bool:
        indices = [i for i in range(len(nums)) if nums[i] == 1]

        for i in range(1, len(indices)):
            if (indices[i] - indices[i-1]) - 1 < k:
                return False

        return True

Sep 24, 2023 Finished Maximum Odd Binary Number:

class Solution:
    def maximumOddBinaryNumber(self, s: str) -> str:
        ones = s.count("1")
        zeroes = s.count("0")

        if ones == 1:
            return "0"*zeroes + "1"
        else:
            return "1"*(ones-1) + "0"*zeroes + "1"

Sep 23, 2023 Finished Crawler Log Folder:

class Solution:
    def minOperations(self, logs: List[str]) -> int:
        level = 0

        for i in logs:
            if i == "../":
                if level != 0:
                    level -= 1
            elif i != "./":
                level += 1

        return level

Sep 22, 2023 Finished Is Subsequence:

class Solution:
    def isSubsequence(self, s: str, t: str) -> bool:
        if s in t:
            return True

        for i in s:
            if i not in t:
                return False

        compare = ""

        for i in t:
            if i in s:
                compare += i

        if list(dict.fromkeys(compare)) == list(dict.fromkeys(s)) and len(compare) >= len(s):
            return True

Sep 17, 2023 Finished Sum of Values at Indices With K Set Bits:

class Solution:
    def sumIndicesWithKSetBits(self, nums: List[int], k: int) -> int:
        return sum([nums[i] for i in range(len(nums)) if str(bin(i))[1:].count('1') == k])

Sep 16, 2023 Finished Sort Array By Parity II:

class Solution:
    def sortArrayByParityII(self, nums: List[int]) -> List[int]:
        odd_nos = [i for i in nums if i % 2 != 0]
        even_nos = [i for i in nums if i % 2 == 0]

        res = []
        even_counter = 0
        odd_counter = 0

        for i in range(len(nums)):
            if i % 2 == 0:
                res.append(even_nos[even_counter])
                even_counter += 1
            else:
                res.append(odd_nos[odd_counter])
                odd_counter += 1

        return res

Sep 10, 2023 Finished Points That Intersect With Cars:

class Solution:
    def numberOfPoints(self, nums: List[List[int]]) -> int:
        points = set()

        for i in nums:
            for j in range(i[0], i[1]+1):
                points.add(j)

        return len(points)

Sep 04, 2023 Finished Count Symmetric Integers:

class Solution:
    def countSymmetricIntegers(self, low: int, high: int) -> int:
        count = 0

        for i in range(low, high+1):
            if len(str(i)) % 2 == 0:
                if sum([int(i) for i in str(i)[:len(str(i)) // 2]]) == sum([int(i) for i in str(i)[len(str(i)) // 2:]]):
                    count += 1

        return count

Sep 02, 2023 Finished Add Two Promises with a decent amount of help:

/**
 * @param {Promise} promise1
 * @param {Promise} promise2
 * @return {Promise}
 */
var addTwoPromises = async function (promise1, promise2) {
  return new Promise(function (resolve, reject) {
    promise1
      .then(function (result1) {
        promise2
          .then(function (result2) {
            resolve(result1 + result2);
          })
          .catch(function (error) {
            reject(error);
          });
      })
      .catch(function (error) {
        reject(error);
      });
  });
};

/**
 * addTwoPromises(Promise.resolve(2), Promise.resolve(2))
 *   .then(console.log); // 4
 */

Aug 27, 2023 Finished Create Target Array in the Given Order:

class Solution:
    def createTargetArray(self, nums: List[int], index: List[int]) -> List[int]:
        res = []

        for i in range(len(nums)):
            res.insert(index[i], nums[i])

        return res

Aug 26, 2023 Finished Confirmation Rate:

# Write your MySQL query statement below
SELECT DISTINCT s.user_id, CASE WHEN ISNULL(ROUND((SELECT COUNT(*) FROM Confirmations WHERE user_id = s.user_id AND action = 'confirmed') / (SELECT COUNT(*) FROM Confirmations WHERE user_id = s.user_id), 2)) THEN 0.00 ELSE ROUND((SELECT COUNT(*) FROM Confirmations WHERE user_id = s.user_id AND action = 'confirmed') / (SELECT COUNT(*) FROM Confirmations WHERE user_id = s.user_id), 2) END AS confirmation_rate FROM Signups s LEFT JOIN Confirmations c ON s.user_id = c.user_id;

Aug 24, 2023 Finished Count Pairs Whose Sum is Less than Target:

class Solution:
    def countPairs(self, nums: List[int], target: int) -> int:
        count = 0

        for i in range(len(nums)):
            for j in range(i+1, len(nums)):
                if nums[i] + nums[j] < target:
                    count += 1

        return count

Aug 23, 2023 Finished Count Pairs Whose Sum is Less than Target:

class Solution:
    def countPairs(self, nums: List[int], target: int) -> int:
        count = 0

        for i in range(len(nums)):
            for j in range(i+1, len(nums)):
                if nums[i] + nums[j] < target:
                    count += 1

        return count

Aug 22, 2023 Finished Number of Lines To Write String:

class Solution:
    def numberOfLines(self, widths: List[int], s: str) -> List[int]:
        widths_dict = {chr(i):widths[i-97] for i in range(97, 123)}
        lines = 1
        width_count = 0

        for i in s:
            if width_count + widths_dict[i] > 100:
                width_count = 0
                lines += 1
            width_count += widths_dict[i]

        return [lines, width_count]

Aug 21, 2023 Finished Sales Analysis III:

# Write your MySQL query statement below
SELECT DISTINCT p.product_id, product_name FROM Product p, Sales s WHERE p.product_id = s.product_id AND (SELECT COUNT(product_id) FROM Sales e WHERE e.product_id = p.product_id AND (e.sale_date >= '2019-01-01' AND e.sale_date <= '2019-03-31')) >= 1 AND (SELECT COUNT(product_id) FROM Sales e WHERE e.product_id = p.product_id AND (e.sale_date < '2019-01-01' OR e.sale_date > '2019-03-31')) = 0;

Aug 20, 2023 Finished Count Salary Categories:

# Write your MySQL query statement below

# Credit - https://leetcode.com/problems/count-salary-categories/solutions/3892510/beats-95-both-sql-and-pandas/

SELECT 'Low Salary' as category, COUNT(account_id) as accounts_count FROM Accounts WHERE income < 20000 UNION SELECT 'Average Salary' as category, COUNT(*) FROM Accounts WHERE income >= 20000 AND income <= 50000 UNION SELECT 'High Salary' as category, COUNT(*) FROM Accounts WHERE income > 50000;

Aug 19, 2023 Finished The Latest Login in 2020:

# Write your MySQL query statement below
SELECT user_id, MAX(time_stamp) as last_stamp FROM Logins WHERE SUBSTRING(time_stamp, 1, 4) = '2020' GROUP BY user_id;

Aug 18, 2023 Finished H-Index:

class Solution:
    def hIndex(self, citations: List[int]) -> int:
        if len(citations) == 1:
            if citations[0] == 0:
                return 0
            else:
                return 1
        else:
            max_h = 0

            for h in range(0, len(citations)+1):
                if len([i for i in citations if i >= h]) >= h and h > max_h:
                    max_h = h

            return max_h

Aug 17, 2023 Finished Average Time of Process per Machine:

# Write your MySQL query statement below

# Credit - https://leetcode.com/problems/average-time-of-process-per-machine/solutions/3722056/sql-join-or-subquery-easy-to-understand/

SELECT a.machine_id, ROUND(AVG(b.timestamp-a.timestamp), 3) as processing_time FROM Activity a JOIN Activity b ON a.machine_id=b.machine_id AND a.process_id=b.process_id AND a.activity_type='start' AND b.activity_type='end' GROUP BY a.machine_id

Aug 16, 2023 Finished Capital Gain/Loss:

# Write your MySQL query statement below
SELECT DISTINCT a.stock_name, ((SELECT SUM(price) FROM Stocks WHERE operation = 'Sell' AND stock_name = a.stock_name) - (SELECT SUM(price) FROM Stocks WHERE operation = 'Buy' AND stock_name = a.stock_name)) as capital_gain_loss FROM Stocks a;

Aug 13, 2023 Finished Max Pair Sum in an Array:

class Solution:
    def maxSum(self, nums: List[int]) -> int:
        max_sum = -1

        for i in range(len(nums)):
            for j in range(i+1, len(nums)):
                if max(list(str(nums[i]))) == max(list(str(nums[j]))):
                    if nums[i] + nums[j] > max_sum:
                        max_sum = nums[i] + nums[j]

        return max_sum

Aug 12, 2023 Finished Actors and Directors Who Cooperated At Least Three Times:

# Write your MySQL query statement below
SELECT DISTINCT a.actor_id, a.director_id FROM ActorDirector a WHERE (SELECT COUNT(*) FROM ActorDirector WHERE actor_id = a.actor_id AND director_id = a.director_id) >= 3;

Aug 11, 2023 Finished Daily Leads and Partners:

# Write your MySQL query statement below
SELECT DISTINCT date_id, make_name, (SELECT COUNT(DISTINCT lead_id) FROM DailySales WHERE date_id = d.date_id AND make_name = d.make_name) AS unique_leads, (SELECT COUNT(DISTINCT partner_id) FROM DailySales WHERE date_id = d.date_id AND make_name = d.make_name) AS unique_partners FROM DailySales d ORDER BY date_id;

Aug 10, 2023 Finished Invalid Tweets:

# Write your MySQL query statement below
SELECT tweet_id FROM Tweets WHERE LENGTH(content) > 15;

Aug 09, 2023 Finished Account Balance After Rounded Purchase:

class Solution:
    def accountBalanceAfterPurchase(self, purchaseAmount: int) -> int:
        remainder = purchaseAmount % 10

        if remainder == 0:
            return 100 - purchaseAmount
        elif remainder < 5:
            return 100 - (purchaseAmount - remainder)
        else:
            return 100 - (purchaseAmount + (10 - remainder))

Aug 08, 2023 Finished Search in Rotated Sorted Array:

class Solution:
    def search(self, nums: List[int], target: int) -> int:
        try:
            return nums.index(target)
        except:
            return -1

Aug 07, 2023 Finished Faulty Keyboard:

class Solution:
    def finalString(self, s: str) -> str:
        res = ""

        for i in s:
            if i != "i":
                res += i
            else:
                res = res[::-1]

        return res

Aug 06, 2023 Finished The Number of Employees Which Report to Each Employee:

# Write your MySQL query statement below
SELECT employee_id, name, (SELECT COUNT(*) FROM Employees WHERE reports_to = e.employee_id) AS reports_count, ROUND((SELECT SUM(age) FROM Employees WHERE reports_to = e.employee_id) / (SELECT COUNT(*) FROM Employees WHERE reports_to = e.employee_id)) AS average_age FROM Employees e WHERE (SELECT COUNT(*) FROM Employees WHERE reports_to = e.employee_id) >= 1 ORDER BY employee_id;

Aug 05, 2023 Finished The Number of Rich Customers:

# Write your MySQL query statement below
SELECT COUNT(DISTINCT customer_id) AS rich_count FROM Store WHERE amount > 500;

Aug 04, 2023 Finished Fix Names in a Table:

# Write your MySQL query statement below
SELECT user_id, CONCAT(UCASE(SUBSTR(name, 1, 1)), LCASE(SUBSTR(name, 2, LENGTH(name)))) as name FROM Users ORDER BY user_id;

Aug 03, 2023 Finished Replace Employee ID With The Unique Identifier:

# Write your MySQL query statement below
SELECT unique_id, name FROM Employees e LEFT JOIN EmployeeUNI u ON e.id = u.id;

Aug 02, 2023 Finished Percentage of Users Attended a Contest:

# Write your MySQL query statement below
SELECT contest_id, ROUND(COUNT(*) / (SELECT COUNT(*) FROM Users) * 100, 2) AS percentage FROM Users u, Register r WHERE u.user_id = r.user_id GROUP BY contest_id ORDER BY percentage DESC, contest_id ASC;

Aug 01, 2023 Finished Immediate Food Delivery II:

# Write your MySQL query statement below
SELECT ROUND((SELECT COUNT(*) FROM Delivery d WHERE d.order_date = d.customer_pref_delivery_date AND d.order_date = (SELECT MIN(order_date) FROM Delivery WHERE customer_id = d.customer_id)) / COUNT(DISTINCT customer_id) * 100, 2) as immediate_percentage FROM Delivery;

Jul 31, 2023 Finished Immediate Food Delivery I:

# Write your MySQL query statement below
SELECT ROUND((SELECT COUNT(*) FROM Delivery WHERE order_date=customer_pref_delivery_date) / COUNT(*) * 100, 2) AS immediate_percentage FROM Delivery;

Jul 30, 2023 Finished Number of Employees Who Met the Target:

class Solution:
    def numberOfEmployeesWhoMetTarget(self, hours: List[int], target: int) -> int:
        return len([i for i in hours if i >= target])

Jul 29, 2023 Finished Customers Who Bought All Products with a bit of help:

# Write your MySQL query statement below
SELECT customer_id FROM Customer GROUP BY customer_id HAVING COUNT(DISTINCT product_key) = (SELECT COUNT(DISTINCT product_key) FROM Product);

Jul 28, 2023 Finished Employee Bonus, LEFT JOIN is so cool:

# Write your MySQL query statement below
SELECT name, bonus FROM Employee e LEFT JOIN Bonus b ON e.empId = b.empId WHERE bonus < 1000 OR ISNULL(bonus);

Jul 27, 2023 Finished Top Travellers (with a little bit of help, at least I learnt about LEFT JOIN):

# Write your MySQL query statement below
SELECT name, IFNULL(SUM(distance), 0) as travelled_distance FROM Users u LEFT JOIN Rides r ON u.id = r.user_id GROUP BY u.id ORDER BY travelled_distance DESC, name;

Jul 26, 2023 Finished Split Strings by Separator:

class Solution:
    def splitWordsBySeparator(self, words: List[str], separator: str) -> List[str]:
        words_new = []

        for i in words:
            words_new.extend(i.split(separator))

        return [i for i in words_new if len(i) > 0]

Jul 25, 2023 Finished Group Sold Products By The Date (with just a bit of help):

# Write your MySQL query statement below
SELECT sell_date, COUNT(DISTINCT product) AS num_sold, GROUP_CONCAT(DISTINCT product ORDER BY product) AS products FROM Activities GROUP BY sell_date;

Jul 24, 2023 Finished Find Followers Count:

# Write your MySQL query statement below
SELECT DISTINCT user_id, (SELECT COUNT(user_id) FROM Followers WHERE user_id = f.user_id) as followers_count FROM Followers f ORDER BY user_id;

Jul 23, 2023 Finished Check if Array is Good:

class Solution:
    def isGood(self, nums: List[int]) -> bool:
        return sorted(nums) == [i for i in range(1, len(nums))] + [len(nums)-1]

Jul 22, 2023 Finished Product Sales Analysis I:

# Write your MySQL query statement below
SELECT product_name, year, price as price FROM Sales NATURAL JOIN Product ORDER BY product_name;

Jul 21, 2023 Finished Biggest Single Number:

# Write your MySQL query statement below
SELECT MAX(e.num) as num FROM MyNumbers e WHERE (SELECT COUNT(num) FROM MyNumbers WHERE num=e.num) = 1;

Jul 20, 2023 Finished Managers with at Least 5 Direct Reports:

# Write your MySQL query statement below
SELECT name FROM Employee e WHERE (SELECT COUNT(d.managerId) FROM Employee d WHERE d.managerId = e.id) >= 5;

Jul 19, 2023 Finished Rising Temperature:

# Write your MySQL query statement below
SELECT id FROM Weather w WHERE temperature > (SELECT temperature FROM Weather WHERE recordDate=DATE_SUB(w.recordDate, INTERVAL 1 DAY));

Jul 18, 2023 Finished Reformat Department Table:

# Write your MySQL query statement below

# Credit - https://leetcode.com/problems/reformat-department-table/solutions/2473482/fully-explained-super-easy/

SELECT d.id, SUM(IF(month='Jan', revenue, null)) as Jan_Revenue, SUM(IF(month='Feb', revenue, null)) as Feb_Revenue, SUM(IF(month='Mar', revenue, null)) as Mar_Revenue, SUM(IF(month='Apr', revenue, null)) as Apr_Revenue, SUM(IF(month='May', revenue, null)) as May_Revenue, SUM(IF(month='Jun', revenue, null)) as Jun_Revenue, SUM(IF(month='Jul', revenue, null)) as Jul_Revenue, SUM(IF(month='Aug', revenue, null)) as Aug_Revenue, SUM(IF(month='Sep', revenue, null)) as Sep_Revenue, SUM(IF(month='Oct', revenue, null)) as Oct_Revenue, SUM(IF(month='Nov', revenue, null)) as Nov_Revenue, SUM(IF(month='Dec', revenue, null)) as Dec_Revenue from Department d GROUP BY id;

Jul 17, 2023 Finished Sum of Squares of Special Elements:

class Solution:
    def sumOfSquares(self, nums: List[int]) -> int:
        return sum([nums[i]**2 for i in range(len(nums)) if len(nums) % (i+1) == 0])

Jul 16, 2023 Finished Second Highest Salary:

# Write your MySQL query statement below
SELECT MAX(salary) as SecondHighestSalary FROM Employee WHERE salary != (SELECT MAX(salary) FROM Employee);

Jul 15, 2023 Finished Investments in 2016:

# Write your MySQL query statement below
SELECT ROUND(SUM(tiv_2016), 2) as tiv_2016 FROM Insurance i WHERE (SELECT COUNT(tiv_2015) FROM Insurance e WHERE e.tiv_2015 = i.tiv_2015) > 1 AND (SELECT COUNT(lat) FROM Insurance e WHERE e.lat = i.lat AND e.lon = i.lon) = 1;

Jul 14, 2023 Finished Bank Account Summary II:

# Write your MySQL query statement below
SELECT name, SUM(amount) as balance FROM Users NATURAL JOIN Transactions GROUP BY account HAVING SUM(amount) > 10000;

Jul 13, 2023 Finished Lemonade Change:

class Solution:
    def lemonadeChange(self, bills: List[int]) -> bool:
        five_bills = 0
        ten_bills = 0
        twenty_bills = 0

        for i in bills:
            if i == 5:
                five_bills += 1
            elif i == 10:
                if five_bills > 0:
                    ten_bills += 1
                    five_bills -= 1
                else:
                    return False
            elif i == 20:
                if five_bills > 0 and ten_bills > 0:
                    twenty_bills += 1
                    ten_bills -= 1
                    five_bills -= 1
                elif five_bills > 2:
                    twenty_bills += 1
                    five_bills -= 3
                else:
                    return False

        return True

Jul 12, 2023 Finished Cells in a Range on an Excel Sheet:

class Solution:
    def cellsInRange(self, s: str) -> List[str]:
        letter_1 = s[0]
        number_1 = s[1]
        letter_2 = s[3]
        number_2 = s[4]

        letters = []
        numbers = []

        for i in range(ord(letter_1), ord(letter_2)+1):
            letters.append(chr(i))

        for i in range(int(number_1), int(number_2)+1):
            numbers.append(i)

        res = []

        for i in letters:
            for j in numbers:
                res.append(i + str(j))

        return res

Jul 11, 2023 Finished Find the Maximum Achievable Number:

class Solution:
    def theMaximumAchievableX(self, num: int, t: int) -> int:
        return num + (2*t)

Jul 10, 2023 Finished License Key Formatting:

class Solution:
    def licenseKeyFormatting(self, s: str, k: int) -> str:
        characters = s.split('-')
        characters = "".join([i.upper() for i in characters])
        num_chars = len(s) - s.count('-')
        groups = num_chars // k
        remainder = num_chars % k
        res = ""

        if remainder == 0:
            for i in range(0, num_chars, k):
                res += characters[i:i+k] + '-'
            res = res[:-1]
        else:
            res += characters[:remainder] + '-'
            for i in range(remainder, num_chars, k):
                res += characters[i:i+k] + '-'
            res = res[:-1]

        return res

Jul 09, 2023 Finished Triangle Judgement:

# Write your MySQL query statement below
SELECT x, y, z,
CASE
    WHEN ((x+y) > z AND (y+z) > x AND (x+z) >y) THEN 'Yes'
    ELSE 'No'
END as triangle
FROM Triangle;

Jul 08, 2023 Finished Game Play Analysis I:

# Write your MySQL query statement below
SELECT player_id, MIN(event_date) as first_login FROM Activity GROUP BY player_id;

Jul 07, 2023 Finished Swap Salary:

# Write your MySQL query statement below
UPDATE Salary SET sex = CASE WHEN sex = 'f' THEN 'm'
                        WHEN sex = 'm' THEN 'f'
END;

Jul 06, 2023 Finished Project Employees I:

# Write your MySQL query statement below
SELECT project_id, ROUND(SUM(experience_years) / COUNT(name), 2) AS average_years FROM Project NATURAL JOIN Employee GROUP BY project_id;

Jul 05, 2023 Finished List the Products Ordered in a Period:

# Write your MySQL query statement below
SELECT DISTINCT product_name, (SELECT SUM(unit) FROM Orders o WHERE o.product_id = p.product_id AND MONTH(order_date) = 2) as unit FROM Products p, Orders o WHERE p.product_id = o.product_id AND (SELECT SUM(unit) FROM Orders o WHERE o.product_id = p.product_id AND MONTH(order_date) = 2) >= 100;

Jul 04, 2023 Finished Average Selling Price:

# Write your MySQL query statement below
SELECT p.product_id, ROUND(SUM(p.price * u.units) / SUM(u.units), 2) as average_price FROM UnitsSold u, Prices p WHERE u.product_id = p.product_id AND u.purchase_date BETWEEN p.start_date AND p.end_date GROUP BY u.product_id;

Jul 03, 2023 Finished Count Square Sum Triples, honestly, original solution should have worked:

class Solution:
    def countTriples(self, n: int) -> int:
        def count(n, li=1):
            if n == 1 or n == 2 or n == 3 or n == 4:
                return 0

            count_i = 0

            for i in range(li, n+1):
                for j in range(i+1, n+1):
                    if (i**2) + (j**2) == n**2:
                        count_i += 1

            return (count_i*2) + count(n-1, last_i)

        return count(n)

Jul 02, 2023 Finished Students and Examinations:

# Write your MySQL query statement below
SELECT s.student_id, student_name, su.subject_name, (SELECT COUNT(*) FROM Examinations e WHERE e.student_id = s.student_id AND e.subject_name = su.subject_name) as attended_exams FROM Students s JOIN Subjects su ORDER BY student_id, subject_name;

Jul 01, 2023 Finished Employees Whose Manager Left the Company:

# Write your MySQL query statement below
SELECT a.employee_id FROM Employees a WHERE (SELECT COUNT(employee_id) FROM Employees WHERE employee_id = a.manager_id) = 0 AND a.salary < 30000 AND a.manager_id IS NOT NULL ORDER BY employee_id;

Jun 30, 2023 Finished Queries Quality and Percentage:

# Write your MySQL query statement below
SELECT a.query_name, ROUND(AVG(a.rating / a.position), 2) as quality, ROUND(((SELECT COUNT(b.query_name) FROM Queries b WHERE rating < 3 AND a.query_name = b.query_name) / COUNT(a.query_name)) * 100, 2) as poor_query_percentage FROM Queries a GROUP BY a.query_name;

Jun 29, 2023 Finished Counter II (just to learn the syntax) and To Be Or Not To Be:

/**
 * @param {string} val
 * @return {Object}
 */
var expect = function(val) {
    var val_1 = val;

    return {
        toBe: (val_2) => {
            if (val_1 === val_2) {
                return true;
            } else {
                throw "Not Equal";
            }
        },
        notToBe: (val_2) => {
             if (val !== val_2) {
                return true;
            } else {
                throw "Equal";
            }
        }
    }

};

/**
 * expect(5).toBe(5); // true
 * expect(5).notToBe(5); // throws "Equal"
 */

Jun 28, 2023 Finished DI String Match:

class Solution:
    def diStringMatch(self, s: str) -> List[int]:
        n = len(s)
        lst = []
        min = 0
        max = n

        for i in s:
            if i == 'I':
                lst.append(min)
                min += 1
            elif i == "D":
                lst.append(max)
                max -= 1

        return lst + [min]

Jun 27, 2023 Finished Number of Beautiful Pairs:

class Solution:
    def countBeautifulPairs(self, nums: List[int]) -> int:
        import math

        count = 0

        for i in range(len(nums)):
            for j in range(i+1, len(nums)):
                if math.gcd(int(str(nums[i])[0]), int(str(nums[j])[-1])) == 1:
                    count += 1

        return count

Jun 26, 2023 Finished Find Maximum Number of String Pairs:

class Solution:
    def maximumNumberOfStringPairs(self, words: List[str]) -> int:
        count = 0

        for i in range(len(words)):
            for j in range(i+1, len(words)):
                if words[i][::-1] == words[j]:
                    count += 1

        return count

Jun 20, 2023 Finished Mean of Array After Removing Some Elements:

class Solution:
    def trimMean(self, arr: List[int]) -> float:
        # Credit - https://leetcode.com/problems/mean-of-array-after-removing-some-elements/solutions/2344789/python-short-simple/
        percentile = (5*len(arr)) // 100
        arr.sort()
        return sum(arr[percentile:len(arr)-percentile]) / (len(arr)-(percentile*2))

Jun 18, 2023 Finished Total Distance Traveled:

class Solution:
    def distanceTraveled(self, mainTank: int, additionalTank: int) -> int:
        dist = 0

        while mainTank > 0:
            if mainTank >= 5 and additionalTank >= 1:
                dist += 50
                mainTank -= 4
                additionalTank -= 1
            else:
                dist += 10
                mainTank -= 1

        return dist

Jun 16, 2023 Finished Count of Matches in Tournament:

class Solution:
    def numberOfMatches(self, n: int) -> int:
        total_matches = 0

        while n > 1:
            if n % 2 == 0:
                total_matches += (n // 2)
                n = n // 2
            else:
                total_matches += (n - 1) // 2
                n = ((n - 1) // 2) + 1

        return total_matches

Jun 15, 2023 Finished Defuse the Bomb:

class Solution:
    def decrypt(self, code: List[int], k: int) -> List[int]:
        if k == 0:
            return [0]*len(code)
        else:
            code_modified = code*(abs(k)+1)
            if k > 0:
                return [sum(code_modified[i+1:i+1+k]) for i in range(len(code))]
            else:
                return [sum(code_modified[-len(code)+k+i:-len(code)+i]) for i in range(len(code))]

Jun 14, 2023 Finished Neither Minimum nor Maximum:

class Solution:
    def findNonMinOrMax(self, nums: List[int]) -> int:
        nums = [i for i in nums if i != min(nums) and i != max(nums)]

        if len(nums) == 0:
            return -1
        else:
            return nums[0]

Jun 13, 2023 Finished Equal Row and Column Pairs:

class Solution:
    def equalPairs(self, grid: List[List[int]]) -> int:
        import numpy as np

        grid = np.array(grid)
        count = 0

        for i in range(len(grid)):
            for j in range(len(grid)):
                if np.array_equal(grid[i], grid[:, j]):
                    count += 1

        return count

Jun 11, 2023 Finished Check if The Number is Fascinating:

class Solution:
    def isFascinating(self, n: int) -> bool:
        return sorted(str(n) + str(2*n) + str(3*n)) == ['1', '2', '3', '4', '5', '6', '7', '8', '9']

Jun 10, 2023 Finished Maximum Number of Balls in a Box:

class Solution:
    def countBalls(self, lowLimit: int, highLimit: int) -> int:
        dict_boxes = {}

        for i in range(lowLimit, highLimit+1):
            if sum([int(i) for i in list(str(i))]) in dict_boxes:
                dict_boxes[sum([int(i) for i in list(str(i))])] += 1
            else:
                dict_boxes[sum([int(i) for i in list(str(i))])] = 1

        return dict_boxes[max(dict_boxes, key=dict_boxes.get)]

Jun 09, 2023 Finished Verifying an Alien Dictionary (finally!):

class Solution:
    def isAlienSorted(self, words: List[str], order: str) -> bool:
        return words == sorted(words, key=lambda word: [order.index(word[i]) for i in range(len(word))])

Jun 08, 2023 Finished Is Object Empty:

/**
 * @param {Object | Array} obj
 * @return {boolean}
 */
var isEmpty = function (obj) {
  let count = 0;

  for (let key in obj) {
    count++;
  }

  return count == 0;
};

Jun 05, 2023 Finished Minimize String Length:

class Solution:
    def minimizedStringLength(self, s: str) -> int:
        return len(set(s))

Jun 03, 2023 Finished Generate Fibonacci Sequence:

/**
 * @return {Generator<number>}
 */
var fibGenerator = function* () {
  let start_value = -1;
  let next_value = 1;
  let value = start_value;

  while (true) {
    value = start_value + next_value;
    start_value = next_value;
    next_value = value;
    yield next_value;
  }
};

/**
 * const gen = fibGenerator();
 * gen.next().value; // 0
 * gen.next().value; // 1
 */

Jun 02, 2023 Finished Special Array With X Elements Greater Than or Equal X:

class Solution:
    def specialArray(self, nums: List[int]) -> int:
        for i in range(0, max(nums)+1):
            if len([j for j in nums if j >= i]) == i:
                return i
        return -1

Jun 01, 2023 Finished Buy Two Chocolates:

class Solution:
    def buyChoco(self, prices: List[int], money: int) -> int:
        min_sum = 201

        for i in range(len(prices)):
            for j in range(i+1, len(prices)):
                if (prices[i] + prices[j]) <= money and (prices[i] + prices[j]) < min_sum:
                    min_sum = (prices[i] + prices[j])


        if min_sum == 201:
            return money

        return money - min_sum

May 29, 2023 Did NOT finish Number of Equivalent Domino Pairs:

class Solution:
    def numEquivDominoPairs(self, dominoes: List[List[int]]) -> int:
        count = 0

        for i in range(len(dominoes)):
            for j in range(i+1, len(dominoes)):
                if (dominoes[i][0] == dominoes[j][0] and dominoes[i][1] == dominoes[j][1]) or (dominoes[i][0] == dominoes[j][1] and dominoes[i][1] == dominoes[j][0]):
                    count += 1

        return count

May 28, 2023 Finished Difference of Number of Distinct Values on Diagonals:

class Solution:
    def differenceOfDistinctValues(self, grid: List[List[int]]) -> List[List[int]]:
        def getTopLeft(grid, r, c):
            res = []
            r -= 1
            c -= 1

            while r >= 0 and c >= 0:
                res.append(grid[r][c])
                r -= 1
                c -= 1

            return len(set(res))

        def getBottomRight(grid, r, c):
            res = []
            r += 1
            c += 1

            while r < len(grid) and c < len(grid[0]):
                res.append(grid[r][c])
                r += 1
                c += 1

            return len(set(res))

        res = []

        for i in range(len(grid)):
            temp = []

            for j in range(len(grid[0])):
                temp.append(abs(getTopLeft(grid, i, j) - getBottomRight(grid, i, j)))

            res.append(temp)

        return res

May 27, 2023 Finsihed Return Length of Arguments Passed:

/**
 * @return {number}
 */
var argumentsLength = function(...args) {
    return args.length;
};

/**
 * argumentsLength(1, 2, 3); // 3
 */

May 26, 2023 Finished Largest Local Values in a Matrix:


class Solution:
    def largestLocal(self, grid: List[List[int]]) -> List[List[int]]:
        import numpy as np
        grid = np.array(grid)
        res = []
        count = 0

        while count < len(grid) - 2:
            temp = []
            end = 3

            while end <= len(grid):
                temp.append(np.amax(grid[count:count+3, end-3:end]))
                end += 1

            res.append(temp)
            count += 1

        return res

May 24, 2023 Finished Count Special Quadruples:

class Solution:
    def countQuadruplets(self, nums: List[int]) -> int:
        count = 0

        for i in range(len(nums)):
            for j in range(i+1, len(nums)):
                for k in range(j+1, len(nums)):
                    for z in range(k+1, len(nums)):
                        if nums[i] + nums[j] + nums[k] == nums[z]:
                            count += 1

        return count

May 21, 2023 Finished Allow One Function Call:

/**
 * @param {Function} fn
 * @return {Function}
 */
var once = function(fn) {
    count = 0

    return function(...args){
        if (count < 1) {
            count += 1
            return fn(...args)
        }

    }
};

/**
 * let fn = (a,b,c) => (a + b + c)
 * let onceFn = once(fn)
 *
 * onceFn(1,2,3); // 6
 * onceFn(2,3,6); // returns undefined without calling fn
 */

May 19, 2023 Finished Maximum Ascending Subarray Sum:

class Solution:
    def maxAscendingSum(self, nums: List[int]) -> int:
        subarrs = []

        for i in range(len(nums)):
            subarrs_temp = [nums[i:j] for j in range(i+1, len(nums)+1)]

            for k in subarrs_temp:
                if sorted(k) == k and list(dict.fromkeys(k)) == k:
                    subarrs.append(k)

        return sum(max(subarrs, key=lambda x: sum(x)))

May 18, 2023 Finished Find the Losers of the Circular Game:

class Solution:
    def circularGameLosers(self, n: int, k: int) -> List[int]:
        lst = [1]
        friend = 1
        count = 1

        while True:
            friend += count*k

            if friend > n:
                friend %= n
                if friend == 0:
                    friend = n

            if friend in lst:
                break
            else:
                lst.append(friend)

            count += 1

        return [i for i in range(1, n+1) if i not in lst]

May 17, 2023 Finished Chunk Array:

/**
 * @param {Array} arr
 * @param {number} size
 * @return {Array[]}
 */
var chunk = function (arr, size) {
  let iteration = Math.floor(arr.length / size);
  let res = [];
  let start = 0;
  let count = 0;

  while (count < iteration) {
    let temp = [];

    for (let i = start; i < start + size; i++) {
      temp.push(arr[i]);
    }

    res.push(temp);
    start += size;
    count += 1;
  }

  let final = [];

  for (let i = start; i < arr.length; i++) {
    final.push(arr[i]);
  }

  res.push(final);

  if (size == 1 || Math.floor(arr.length / size) == arr.length / size) {
    res.pop();
  }

  return res;
};

May 16, 2023 Finished Number of Senior Citizens:

class Solution:
    def countSeniors(self, details: List[str]) -> int:
        count = 0

        for i in details:
            if int(i[11:13]) > 60:
                count += 1

        return count

May 10, 2023 Finished Number of Unique Subjects Taught by Each Teacher:

# Write your MySQL query statement below
SELECT teacher_id, COUNT(DISTINCT subject_id) as cnt FROM Teacher GROUP BY teacher_id;

May 08, 2023 Finished Minimum Changes To Make Alternating Binary String:

class Solution:
    def minOperations(self, s: str) -> int:
        if len(s) == 1:
            return 0
        else:
            count_1 = 0

            if s[0] == '0':
                compare = "1"
            else:
                compare = "0"

            for i in range(1, len(s)):
                if s[i] != compare:
                    count_1 += 1

                if compare == "0":
                    compare = "1"
                else:
                    compare = "0"

            count_2 = 1

            if s[0] == "0":
                s = "1" + s[1:]
                compare = "0"
            else:
                s = "0" + s[1:]
                compare = "1"

            for i in range(1, len(s)):
                if s[i] != compare:
                    count_2 += 1

                if compare == "0":
                    compare = "1"
                else:
                    compare = "0"

            return min(count_1, count_2)

May 07, 2023 Finished Find the Distinct Difference Array:

class Solution:
    def distinctDifferenceArray(self, nums: List[int]) -> List[int]:
        return [len(set(nums[:i+1])) - len(set(nums[i+1:])) for i in range(len(nums))]

May 06, 2023 Finished Maximum Difference by Remapping a Digit:

class Solution:
    def minMaxDifference(self, num: int) -> int:
        num_str = str(num)

        max_num = max([int(num_str.replace(i, '9')) for i in num_str])
        min_num = min([int(num_str.replace(i, '0')) for i in num_str])

        return max_num - min_num

May 05, 2023 Finished Create Hello World Function:

/**
 * @return {Function}
 */
var createHelloWorld = function () {
  return function (...args) {
    return "Hello World";
  };
};

/**
 * const f = createHelloWorld();
 * f(); // "Hello World"
 */

May 04, 2023 Finished Primary Department for Each Employee:

# Write your MySQL query statement below
SELECT DISTINCT employee_id, department_id FROM Employee WHERE primary_flag = 'Y';

May 02, 2023 Finished Maximum Sum With Exactly K Elements:

class Solution:
    def maximizeSum(self, nums: List[int], k: int) -> int:
        score = 0

        while k > 0:
            nums.sort()
            score += nums[-1]
            nums[-1] += 1
            k -= 1

        return score

May 01, 2023 Not sure why my solution for Minimum Absolute Sum Difference didn't pass:

class Solution:
    def minAbsoluteSumDiff(self, nums1: List[int], nums2: List[int]) -> int:
        if nums1 == nums2:
            return 0
        else:
            index = max(range(len(nums2)), key=lambda x: abs(nums1[x] - nums2[x]))
            nums1_copy = nums1.copy()
            nums1_copy.remove(nums1[index])
            replacement = min(nums1_copy, key=lambda x: abs(x - nums2[index]))
            nums1[index] = replacement

            return sum([abs(nums1[i] - nums2[i]) for i in range(len(nums2))])

Apr 30, 2023 Finished Determine the Winner of a Bowling Game:

class Solution:
    def isWinner(self, player1: List[int], player2: List[int]) -> int:
        score_1 = player1[0]
        score_2 = player2[0]

        if len(player1) > 1:
            if player1[0] == 10:
                score_1 += 2*player1[1]
            else:
                score_1 += player1[1]

            if player2[0] == 10:
                score_2 += 2*player2[1]
            else:
                score_2 += player2[1]

        for i in range(2, len(player1)):
            if 10 in player1[i-2:i]:
                score_1 += 2*player1[i]
            else:
                score_1 += player1[i]

        for i in range(2, len(player2)):
            if 10 in player2[i-2:i]:
                score_2 += 2*player2[i]
            else:
                score_2 += player2[i]

        if score_1 > score_2:
            return 1
        elif score_2 > score_1:
            return 2
        else:
            return 0

Apr 28, 2023 Finished Calculate Delayed Arrival Time:

class Solution:
    def findDelayedArrivalTime(self, arrivalTime: int, delayedTime: int) -> int:
        return (arrivalTime + delayedTime) % 24

Apr 26, 2023 Finished Sum Multiples:

class Solution:
    def sumOfMultiples(self, n: int) -> int:
        return sum([i for i in range(1, n+1) if i % 3 == 0 or i % 5 == 0 or i % 7 == 0])

Apr 25, 2023 Tried my hand at Smallest Number in Infinite Set.
Apr 24, 2023 Finished Last Stone Weight:

class Solution:
    def lastStoneWeight(self, stones: List[int]) -> int:
        stones.sort(reverse=True)

        while len(stones) > 1:
            if stones[0] == stones[1]:
                stones.pop(0)
                stones.pop(0)
            elif stones[0] != stones[1]:
                stones[0] = stones[0] - stones[1]
                stones.pop(1)
            stones.sort(reverse=True)

        if len(stones) == 0:
            return 0
        else:
            return stones[0]

Apr 23, 2023 Finished Filter Elements from Array:

/**
 * @param {number[]} arr
 * @param {Function} fn
 * @return {number[]}
 */
var filter = function (arr, fn) {
  let res = [];

  for (let i = 0; i < arr.length; i++) {
    if (fn(arr[i], i)) {
      res.push(arr[i]);
    }
  }

  return res;
};

Apr 22, 2023 Finished Apply Transform Over Each Element in Array:

/**
 * @param {number[]} arr
 * @param {Function} fn
 * @return {number[]}
 */
var map = function (arr, fn) {
  for (let i = 0; i < arr.length; i++) {
    arr[i] = fn(arr[i], i);
  }

  return arr;
};

Apr 21, 2023 Finished Find the Maximum Divisibility Score:

class Solution:
    def maxDivScore(self, nums: List[int], divisors: List[int]) -> int:
        res_temp = []

        for i in divisors:
            count = 0
            for j in nums:
                if j % i == 0:
                    count += 1
            res_temp.append((i, count))

        res_temp.sort()
        return max(res_temp, key=lambda x: x[1])[0]

Apr 17, 2023-Apr 18, 2023 Finished Row With Maximum Ones:

class Solution:
    def rowAndMaximumOnes(self, mat: List[List[int]]) -> List[int]:
        return [mat.index(max(mat, key=lambda x: x.count(1))), max(mat, key=lambda x: x.count(1)).count(1)]

Apr 16, 2023 Finished Find the Width of Columns of a Grid:

class Solution:
    def findColumnWidth(self, grid: List[List[int]]) -> List[int]:
        cols = []
        j = 0

        while j < len(grid[0]):
            col = []
            for i in grid:
                col.append(str(i[j]))
            cols.append(col)
            j += 1

        return [len(max(i, key=lambda x: len(x))) for i in cols]

Apr 15, 2023 Finished Counter:

/**
 * @param {number} n
 * @return {Function} counter
 */
var createCounter = function (n) {
  count = -1;

  return function () {
    count += 1;
    return n + count;
  };
};

/**
 * const counter = createCounter(10)
 * counter() // 10
 * counter() // 11
 * counter() // 12
 */

Apr 14, 2023 Finished Function Composition:

/**
 * @param {Function[]} functions
 * @return {Function}
 */
var compose = function (functions) {
  return function (x) {
    functions.reverse();
    let num = x;

    for (let i = 0; i < functions.length; i++) {
      num = functions[i](num);
    }

    return num;
  };
};

/**
 * const fn = compose([x => x + 1, x => 2 * x])
 * fn(4) // 9
 */

Apr 11, 2023 Finished Decompress Run-Length Encoded List:

class Solution:
    def decompressRLElist(self, nums: List[int]) -> List[int]:
        res = []

        for i in range(0, len(nums), 2):
            res.extend([nums[i + 1]] * nums[i])

        return res

Apr 09, 2023 Finished Prime In Diagonal (the square root tricked made it not time out):

class Solution:
    def diagonalPrime(self, nums: List[List[int]]) -> int:
        def is_prime(num):
            if num <= 1:
                return False

            for i in range(2, int(num**0.5)+1):
                if num % i == 0:
                    return False
            return True

        primes = []

        for i in range(len(nums)):
            if is_prime(nums[i][len(nums) - i - 1]):
                primes.append(nums[i][len(nums) - i - 1])
            if is_prime(nums[i][i]):
                primes.append(nums[i][i])

        return max(primes, default=0)

Apr 08, 2023 Never mind, finished Sort Array by Increasing Frequency:

class Solution:
    def frequencySort(self, nums: List[int]) -> List[int]:
        nums.sort(reverse=True)
        return sorted(nums, key=lambda x: nums.count(x))

Apr 07, 2023 Close to finishing Check if Binary String Has at Most One Segment of Ones.
Apr 05, 2023 Finished Rearrange Characters to Make Target String:

class Solution:
    def rearrangeCharacters(self, s: str, target: str) -> int:
        if len(s) < len(target):
            return 0

        li = [i for i in s if i in target]

        if len(li) < len(target):
            return 0
        elif False in [i in li for i in target]:
            return 0

        dict_li = {i: li.count(i) // target.count(i) for i in set(li)}

        return min(dict_li.values(), default=0)

Apr 04, 2023 Finished Decode XORed Array:

class Solution:
    def decode(self, encoded: List[int], first: int) -> List[int]:
        res = [first]

        for i in range(len(encoded)):
            res.append(res[i] ^ encoded[i])

        return res

Apr 03, 2023 Finished Find the Longest Balanced Substring of a Binary String:

class Solution:
    def findTheLongestBalancedSubstring(self, s: str) -> int:
        if len(s) % 2 == 0:
            for i in range(len(s), 1, -2):
                if "0"*(i // 2) + "1"*(i // 2) in s:
                    return i
            else:
                return 0
        else:
            for i in range(len(s)-1, 1, -2):
                if "0"*(i // 2) + "1"*(i // 2) in s:
                    return i
            else:
                return 0

Apr 02, 2023 Finished Form Smallest Number From Two Digit Arrays:

class Solution:
    def minNumber(self, nums1: List[int], nums2: List[int]) -> int:
        combined_nums = [i for i in nums1 if i in nums2]
        min_combined = min(combined_nums, default=1000000)
        min_1 = int(str(min(nums1)) + str(min(nums2)))
        min_2 = int(str(min(nums2)) + str(min(nums1)))

        return min(min_combined, min_1, min_2)

Apr 01, 2023 Finished Design Parking System:

class ParkingSystem:

    def __init__(self, big: int, medium: int, small: int):
        self.max_big = big
        self.max_med = medium
        self.max_small = small

    def addCar(self, carType: int) -> bool:
        if carType == 1:
            if self.max_big >= 1:
                self.max_big -= 1
                return True
            else:
                return False
        elif carType == 2:
            if self.max_med >= 1:
                self.max_med -= 1
                return True
            else:
                return False
        else:
            if self.max_small >= 1:
                self.max_small -= 1
                return True
            else:
                return False


# Your ParkingSystem object will be instantiated and called as such:
# obj = ParkingSystem(big, medium, small)
# param_1 = obj.addCar(carType)

Mar 31, 2023 Finished K Items With the Maximum Sum:

class Solution:
    def kItemsWithMaximumSum(self, numOnes: int, numZeros: int, numNegOnes: int, k: int) -> int:
        lst = []

        for i in range(numOnes):
            lst.append(1)

        for i in range(numZeros):
            lst.append(0)

        for i in range(numNegOnes):
            lst.append(-1)

        lst = sorted(lst, reverse=True)
        return sum(lst[:k])

Mar 30, 2023 Finished Check if Matrix Is X-Matrix:

class Solution:
    def checkXMatrix(self, grid: List[List[int]]) -> bool:
        for i in range(len(grid)):
            for j in range(len(grid)):
                if i == j:
                    if grid[i][j] == 0:
                        return False
                elif i + j == len(grid) - 1:
                    if grid[i][j] == 0:
                        return False
                else:
                    if grid[i][j] != 0:
                        return False
        return True

Mar 29, 2023 Finished Maximum Population Year:

class Solution:
    def maximumPopulation(self, logs: List[List[int]]) -> int:
        births = [i[0] for i in logs]
        deaths = [i[1] for i in logs]

        count = 0
        res = {}

        for i in range(1950, 2051):
            count += births.count(i)
            count -= deaths.count(i)
            res[i] = count

        return max(res.items(), key=lambda x: x[1])[0]

Mar 28, 2023 Finished Encode and Decode TinyURL:

class Codec:

    def encode(self, longUrl: str) -> str:
        self.count = 0
        self.url = {}
        self.url[longUrl] = str(self.count)
        self.count += 1

        return self.url[longUrl]


    def decode(self, shortUrl: str) -> str:
        return list(self.url.keys())[list(self.url.values()).index(shortUrl)]


# Your Codec object will be instantiated and called as such:
# codec = Codec()
# codec.decode(codec.encode(url))

Mar 27, 2023 Finished Monotonic Array:

class Solution:
    def isMonotonic(self, nums: List[int]) -> bool:
        if len(set(nums)) == 1:
            return True
        else:
            while True:
                if nums[0] > nums[1]:
                    for i in range(2, len(nums)):
                        if nums[i] > nums[i - 1]:
                            return False
                    return True
                elif nums[0] < nums[1]:
                    for i in range(2, len(nums)):
                        if nums[i] < nums[i - 1]:
                            return False
                    return True
                else:
                    nums = nums[1:]

Mar 25, 2023 Finished Maximum Repeating Substring:

class Solution:
    def maxRepeating(self, sequence: str, word: str) -> int:
        count = 0
        copy = word

        while word in sequence or word == sequence:
            word += copy
            count += 1

        return count

Mar 24, 2023 Finished Determine Whether Matrix Can Be Obtained By Rotation:

class Solution:
    def findRotation(self, mat: List[List[int]], target: List[List[int]]) -> bool:
        import numpy as np

        matrix = np.array(mat)
        first_rotation = np.rot90(matrix)
        second_rotation = np.rot90(first_rotation)
        third_rotation = np.rot90(second_rotation)

        if (matrix.tolist() == target) or (first_rotation.tolist() == target) or (second_rotation.tolist() == target) or (third_rotation.tolist() == target):
            return True
        else:
            return False

Mar 23, 2023 Finished (not really) with Valid Mountain Array:

class Solution:
    def validMountainArray(self, arr: List[int]) -> bool:
        if len(arr) < 3:
            return False
        elif sorted(arr) == arr or sorted(arr, reverse=True) == arr:
            return False
        else:
            for mountain_index in range(2, len(arr)):
                elem_before = arr[:mountain_index]
                elem_after = arr[mountain_index:]

                if (len(elem_before) == len(set(elem_before)) and len(elem_after) == len(set(elem_after))) and (sorted(elem_before) == elem_before and sorted(elem_after, reverse=True) == elem_after):
                    return True
            else:
                return False

Mar 22, 2023 Got started with Valid Mountain Array. Nearly done.
Mar 21, 2023 Finished Pass the Pillow:

class Solution:
    def passThePillow(self, n: int, time: int) -> int:
        res = 1
        temp = 1
        bounce = False

        while temp <= time:
            if res < n and not bounce:
                res += 1
                if res >= n:
                    bounce = True
            elif res == 1:
                bounce = False
                res += 1
            else:
                res -= 1

            temp += 1

        return res

Mar 20, 2023 Finished Number of Even and Odd Bits:

class Solution:
    def evenOddBit(self, n: int) -> List[int]:
        binary = str(bin(n))[2:][::-1]
        return [len([i for i in range(len(binary)) if binary[i] == '1' and i % 2 == 0]), len([i for i in range(len(binary)) if binary[i] == '1' and i % 2 != 0])]

Mar 19, 2023 Finished Delete Duplicate Emails but I had to look at the solution:

# Please write a DELETE statement and DO NOT write a SELECT statement.
# Write your MySQL query statement below
DELETE p1 FROM Person p1, Person p2 WHERE p1.Email = p2.Email AND p1.Id > p2.Id

Mar 18, 2023 Finished Combine Two Tables and Matrix Cells in Distance Order:

# Write your MySQL query statement below
SELECT FirstName, LastName, City, State FROM Person
LEFT JOIN Address
ON Person.PersonId = Address.PersonId;

class Solution:
    def allCellsDistOrder(self, rows: int, cols: int, rCenter: int, cCenter: int) -> List[List[int]]:
        res = []

        for i in range(rows):
            for j in range(cols):
                res.append([i, j])

        res = sorted(res, key=lambda x: abs(x[0] - rCenter) + abs(x[1] - cCenter))

        return res

Mar 17, 2023 Finished Implement Trie (Prefix Tree):

class Trie:

    def __init__(self):
        self.words = []

    def insert(self, word: str) -> None:
        self.words.append(word)

    def search(self, word: str) -> bool:
        return word in self.words

    def startsWith(self, prefix: str) -> bool:
        if True in [i.startswith(prefix) for i in self.words]:
            return True
        else:
            return False


# Your Trie object will be instantiated and called as such:
# obj = Trie()
# obj.insert(word)
# param_2 = obj.search(word)
# param_3 = obj.startsWith(prefix)

Mar 15, 2023 Got started with Evaluate Boolean Binary Tree.
Mar 14, 2023 Happy Pi Day! Finished Count the Number of Vowel Strings in Range:

class Solution:
    def vowelStrings(self, words: List[str], left: int, right: int) -> int:
        return len([i for i in words[left:right+1] if i[0] in 'aeiouAEIOU' and i[-1] in 'aeiouAEIOU'])

Mar 12, 2023 Finished Sort Even and Odd Indices Independently:

class Solution:
    def sortEvenOdd(self, nums: List[int]) -> List[int]:
        odd_int = [nums[i] for i in range(len(nums)) if i % 2 != 0]
        even_int = [nums[i] for i in range(len(nums)) if i % 2 == 0]
        odd_int.sort(reverse=True)
        even_int.sort()

        print(odd_int, even_int)

        new_num = []

        for i in range(len(nums) // 2):
            new_num.append(even_int[i])
            new_num.append(odd_int[i])

        if len(nums) % 2 != 0:
            return new_num + [even_int[-1]]
        else:
            return new_num

Mar 11, 2023 Finished Make Two Arrays Equal by Reversing Subarrays, did not expect my first "throwaway" solution to work:

class Solution:
    def canBeEqual(self, target: List[int], arr: List[int]) -> bool:
        if sorted(arr) == sorted(target):
            return True
        return False

Mar 10, 2023 Finished Divide a String Into Groups of Size k:

class Solution:
    def divideString(self, s: str, k: int, fill: str) -> List[str]:
        temp = [s[i:i+k] for i in range(0, len(s), k)]

        for i in range(len(temp)):
            if len(temp[i]) != k:
                temp[i] = temp[i] + fill * (k - len(temp[i]))

        return temp

Mar 09, 2023 Finished Intersection of Multiple Arrays:

class Solution:
    def intersection(self, nums: List[List[int]]) -> List[int]:
        candidates = [i for j in nums for i in j]
        res = []

        for i in candidates:
            if False not in [i in j for j in nums]:
                res.append(i)

        return sorted(set(res))

Mar 08, 2023 Finished Minimum Number of Operations to Convert Time:

class Solution:
    def convertTime(self, current: str, correct: str) -> int:
        current_minutes = int(current[:2]) * 60 + int(current[3:])
        correct_minutes = int(correct[:2]) * 60 + int(correct[3:])
        diff = correct_minutes - current_minutes
        step = 0

        while diff != 0:
            for i in range(diff // 60):
                diff -= 60
                step += 1

            if diff == 0:
                break

            for i in range(diff // 15):
                diff -= 15
                step += 1

            if diff == 0:
                break

            for i in range(diff // 5):
                diff -= 5
                step += 1

            if diff == 0:
                break

            for i in range(diff // 1):
                diff -= 1
                step += 1

        return step

Mar 07, 2023 Finished Left and Right Sum Differences:

class Solution:
    def leftRigthDifference(self, nums: List[int]) -> List[int]:
        leftSum = [sum(nums[:i]) for i in range(len(nums))]
        rightSum = [sum(nums[i+1:]) for i in range(len(nums))]

        return [abs(leftSum[i] - rightSum[i]) for i in range(len(nums))]

Feb 20, 2023 Finished Minimum Distance Between BST Nodes:

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def minDiffInBST(self, root: Optional[TreeNode]) -> int:
        res = []

        def traverse(tree, array):
            if tree:
                array.append(tree.val)
                traverse(tree.left, res)
                traverse(tree.right, res)

        traverse(root, res)

        res = sorted(list(dict.fromkeys(res)))

        diff = []

        for i in range(len(res)):
            for j in range(i+1, len(res)):
                diff.append(abs(res[j] - res[i]))

        return min(diff)

Feb 19, 2023 Finished Merge Two 2D Arrays by Summing Values:

class Solution:
    def mergeArrays(self, nums1: List[List[int]], nums2: List[List[int]]) -> List[List[int]]:
        res = []

        for i in nums1:
            if i[0] in [j[0] for j in nums2]:
                res.append([i[0], i[1] + [j for j in nums2 if j[0] == i[0]][0][1]])
            else:
                res.append([i[0], i[1]])

        for j in nums2:
            if j[0] not in [i[0] for i in nums1]:
                res.append([j[0], j[1]])

        return sorted(res, key=lambda x: x[0])

Feb 18, 2023 Did NOT finish Basic Calculator II:

class Solution:
    def calculate(self, s: str) -> int:
        s = "".join([i for i in s if i != " "])

        def get_operands(st, operator):
            operand_1 = ""
            operand_2 = ""
            start_index = 0
            end_index = 0

            for i in range(st.index(operator) - 1, -1, -1):
                if st[i] in "+-/*":
                    break
                operand_1 = st[i : st.index(operator)]
                start_index = i

            for i in range(st.index(operator) + 1, len(st)):
                if st[i] in "+-/*":
                    break
                operand_2 = st[st.index(operator) + 1 : i + 1]
                end_index = i

            return (operand_1, operand_2, start_index, end_index)

        if "*" in s and "/" in s:
            if s.index("*") < s.index("/"):
                while "*" in s:
                    print("*")
                    operand_1, operand_2, start_index, end_index = get_operands(s, "*")
                    print(
                        operand_1,
                        operand_2,
                        start_index,
                        end_index,
                        s[start_index : end_index + 1],
                    )
                    s = (
                        s[:start_index]
                        + str(int(operand_1) * int(operand_2))
                        + s[end_index + 1 :]
                    )

                while "/" in s:
                    print("/")
                    operand_1, operand_2, start_index, end_index = get_operands(s, "/")
                    print(
                        operand_1,
                        operand_2,
                        start_index,
                        end_index,
                        s[start_index : end_index + 1],
                    )
                    s = (
                        s[:start_index]
                        + str(int(operand_1) // int(operand_2))
                        + s[end_index + 1 :]
                    )
            else:
                while "/" in s:
                    print("/")
                    operand_1, operand_2, start_index, end_index = get_operands(s, "/")
                    print(
                        operand_1,
                        operand_2,
                        start_index,
                        end_index,
                        s[start_index : end_index + 1],
                    )
                    s = (
                        s[:start_index]
                        + str(int(operand_1) // int(operand_2))
                        + s[end_index + 1 :]
                    )

                while "*" in s:
                    print("*")
                    operand_1, operand_2, start_index, end_index = get_operands(s, "*")
                    print(
                        operand_1,
                        operand_2,
                        start_index,
                        end_index,
                        s[start_index : end_index + 1],
                    )
                    s = (
                        s[:start_index]
                        + str(int(operand_1) * int(operand_2))
                        + s[end_index + 1 :]
                    )
        else:
            while "*" in s:
                print("*")
                operand_1, operand_2, start_index, end_index = get_operands(s, "*")
                print(
                    operand_1,
                    operand_2,
                    start_index,
                    end_index,
                    s[start_index : end_index + 1],
                )
                s = (
                    s[:start_index]
                    + str(int(operand_1) * int(operand_2))
                    + s[end_index + 1 :]
                )

            while "/" in s:
                print("/")
                operand_1, operand_2, start_index, end_index = get_operands(s, "/")
                print(
                    operand_1,
                    operand_2,
                    start_index,
                    end_index,
                    s[start_index : end_index + 1],
                )
                s = (
                    s[:start_index]
                    + str(int(operand_1) // int(operand_2))
                    + s[end_index + 1 :]
                )

        if "+" in s and "-" in s:
            if s.index("+") < s.index("-"):
                while "+" in s and s.index("+") != 0:
                    print("+")
                    operand_1, operand_2, start_index, end_index = get_operands(s, "+")
                    print(
                        operand_1,
                        operand_2,
                        start_index,
                        end_index,
                        s[start_index : end_index + 1],
                    )
                    s = (
                        s[:start_index]
                        + str(int(operand_1) + int(operand_2))
                        + s[end_index + 1 :]
                    )

                while "-" in s and s.index("-") != 0:
                    print("-")
                    operand_1, operand_2, start_index, end_index = get_operands(s, "-")
                    print(
                        operand_1,
                        operand_2,
                        start_index,
                        end_index,
                        s[start_index : end_index + 1],
                    )
                    s = (
                        s[:start_index]
                        + str(int(operand_1) - int(operand_2))
                        + s[end_index + 1 :]
                    )
                    print(s)
            else:
                while "-" in s and s.index("-") != 0:
                    print("-")
                    operand_1, operand_2, start_index, end_index = get_operands(s, "-")
                    print(
                        operand_1,
                        operand_2,
                        start_index,
                        end_index,
                        s[start_index : end_index + 1],
                    )
                    s = (
                        s[:start_index]
                        + str(int(operand_1) - int(operand_2))
                        + s[end_index + 1 :]
                    )
                    print(s)

                while "+" in s and s.index("+") != 0:
                    print("+")
                    operand_1, operand_2, start_index, end_index = get_operands(s, "+")
                    print(
                        operand_1,
                        operand_2,
                        start_index,
                        end_index,
                        s[start_index : end_index + 1],
                    )
                    s = (
                        s[:start_index]
                        + str(int(operand_1) + int(operand_2))
                        + s[end_index + 1 :]
                    )
        else:
            while "-" in s and s.index("-") != 0:
                print("-")
                operand_1, operand_2, start_index, end_index = get_operands(s, "-")
                print(
                    operand_1,
                    operand_2,
                    start_index,
                    end_index,
                    s[start_index : end_index + 1],
                )
                s = (
                    s[:start_index]
                    + str(int(operand_1) - int(operand_2))
                    + s[end_index + 1 :]
                )
                print(s)

            while "+" in s and s.index("+") != 0:
                print("+")
                operand_1, operand_2, start_index, end_index = get_operands(s, "+")
                print(
                    operand_1,
                    operand_2,
                    start_index,
                    end_index,
                    s[start_index : end_index + 1],
                )
                s = (
                    s[:start_index]
                    + str(int(operand_1) + int(operand_2))
                    + s[end_index + 1 :]
                )

        return int(s)

Feb 17, 2023 Finished Minimum Moves to Convert String:

class Solution:
    def minimumMoves(self, s: str) -> int:
        if 'X' not in s:
            return 0
        else:
            count = 0

            while 'X' in s:
                ind = s.index('X')
                s_arr = [i for i in s]
                s_arr[ind:ind+3] = ['O', 'O', 'O']
                count += 1
                s = "".join(s_arr)

            return count

Feb 16, 2023 Finished Remove One Element to Make the Array Strictly Increasing:

class Solution:
    def canBeIncreasing(self, nums: List[int]) -> bool:
        def is_strictly_increasing(lst):
            for i in range(1, len(lst)):
                if lst[i - 1] >= lst[i]:
                    return False
            return True

        if is_strictly_increasing(nums):
            return True

        for i in range(len(nums)):
            if is_strictly_increasing(nums[:i] + nums[i+1:]):
                return True

        return False

Feb 15, 2023 Finished Find Subarrays With Equal Sum:

class Solution:
    def findSubarrays(self, nums: List[int]) -> bool:
        sums = []

        for i in range(len(nums) - 1):
            if sum(nums[i:i+2]) in sums:
                return True
            else:
                sums.append(sum(nums[i:i+2]))

        return False

Feb 12, 2023 Finished Find the Array Concatenation Value:

class Solution:
    def findTheArrayConcVal(self, nums: List[int]) -> int:
        concatenation_value = 0

        while len(nums) > 0:
            if len(nums) > 1:
                concatenation_value += int(str(nums[0]) + str(nums[-1]))
                del nums[0]
                del nums[-1]
            else:
                concatenation_value += nums[0]
                del nums[0]

        return concatenation_value

Feb 11, 2023 Finished Summary Ranges:

class Solution:
    def summaryRanges(self, nums: List[int]) -> List[str]:
        nested_nums = []
        res = []

        for i in nums:
            if i not in [j for k in nested_nums for j in k]:
                nested_lst = []
                count = i

                while count in nums:
                    nested_lst.append(count)
                    count += 1

                nested_nums.append(nested_lst)

        for i in nested_nums:
            if len(i) == 1:
                res.append(str(i[0]))
            else:
                res.append(f'{min(i)}->{max(i)}')

        return res

Feb 10, 2023 Finished Maximum Number of Balloons:

class Solution:
    def maxNumberOfBalloons(self, text: str) -> int:
        chars = [i for i in text if i in "balloon"]
        chars = {i: chars.count(i) for i in dict.fromkeys(chars)}
        count = 0

        if 'b' not in chars or 'a' not in chars or 'l' not in chars or 'o' not in chars or 'n' not in chars:
            return 0

        while True:
            if chars['b'] >= 1 and chars['a'] >= 1 and chars['l'] >= 2 and chars['o'] >= 2 and  chars['n'] >= 1:
                count += 1
                chars['b'] -= 1
                chars['a'] -= 1
                chars['l'] -= 2
                chars['o'] -= 2
                chars['n'] -= 1
            else:
                break

        return count

Feb 09, 2023 Finished Count Hills and Valleys in an Array:

class Solution:
    def countHillValley(self, nums: List[int]) -> int:
        filtered_list = []
        last_num = None

        for i in nums:
            if i != last_num:
                filtered_list.append(i)
                last_num = i


        count = 0

        for i in range(1, len(filtered_list) - 1):
            if filtered_list[i] > filtered_list[i-1] and filtered_list[i] > filtered_list[i+1]:
                count += 1
            elif filtered_list[i] < filtered_list[i-1] and filtered_list[i] < filtered_list[i+1]:
                count += 1

        return count

Feb 08, 2023 Finished Sum of All Subset XOR Totals:

class Solution:
    def subsetXORSum(self, nums: List[int]) -> int:
        from itertools import combinations

        total = 0
        sublists = []

        for i in range(2, len(nums) + 1):
            sublists.append(list(combinations(nums, i)))

        for i in sublists:
            for j in i:
                eval_str = ""
                for k in j:
                    eval_str += str(k) + "^"
                total += eval(eval_str[:-1])

        return total + sum(nums)

Feb 07, 2023 Finished [Count Distinct Numbers on Board]https://leetcode.com/problems/count-distinct-numbers-on-board/):

class Solution:
    def distinctIntegers(self, n: int) -> int:
        has_stopped = False
        numbers_count = [n]
        numbers = [n]

        while not has_stopped:
            new_numbers = []
            count = 0

            for i in range(1, n+1):
                if True in [j % i == 1 for j in numbers]:
                    new_numbers.append(i)
                    count += 1

            if count == 0:
                has_stopped = True

            numbers_count.extend(new_numbers)
            numbers = new_numbers

        return len(set(numbers_count))

Feb 06, 2023 Finished Take Gifts From the Richest Pile:

class Solution:
    def pickGifts(self, gifts: List[int], k: int) -> int:
        import math

        while k > 0:
            gifts = sorted(gifts)
            gifts[-1] = math.floor(math.sqrt(gifts[-1]))
            k -= 1

        return sum(gifts)

Feb 04, 2023 Finished Separate the Digits in an Array:

class Solution:
    def separateDigits(self, nums: List[int]) -> List[int]:
        res = []

        for i in nums:
            for j in str(i):
                res.append(int(j))

        return res

Feb 03, 2023 Finished Count Good Triplets:

class Solution:
    def countGoodTriplets(self, arr: List[int], a: int, b: int, c: int) -> int:
        count = 0

        for i in range(len(arr)):
            for j in range(i+1, len(arr)):
                for k in range(j+1, len(arr)):
                    if abs(arr[i] - arr[j]) <= a and abs(arr[j] - arr[k]) <= b and abs(arr[i] - arr[k]) <= c:
                        count += 1

        return count

Feb 02, 2023 Finished Count Elements With Strictly Smaller and Greater Elements:

class Solution:
    def countElements(self, nums: List[int]) -> int:
        return len([i for i in nums if True in [j > i for j in nums] and True in [k < i for k in nums]])

Feb 01, 2023 Finished Minimum Common Value:

class Solution:
    def getCommon(self, nums1: List[int], nums2: List[int]) -> int:
        if nums1[-1] < nums2[0] or nums2[-1] < nums2[0]:
            return -1
        for i in nums1:
            if i in nums2:
                return i
        return -1

Jan 29, 2023 Finished Largest Number After Digit Swaps by Parity:

class Solution:
    def largestInteger(self, num: int) -> int:
        num = list(str(num))

        for i in range(len(num)):
            for j in range(i, len(num)):
                if num[j] > num[i] and int(num[j]) % 2 == int(num[i]) % 2:
                    num[i], num[j] = num[j], num[i]

        return int("".join(num))

Jan 28, 2023 Finished Maximum Units on a Truck:

class Solution:
    def maximumUnits(self, boxTypes: List[List[int]], truckSize: int) -> int:
        boxes = sorted(boxTypes, key=lambda x: x[1], reverse=True)
        sum_of_boxes = 0
        total = 0

        while sum_of_boxes <= truckSize and len(boxes) > 0:
            if sum_of_boxes + boxes[0][0] > truckSize:
                total += (truckSize - sum_of_boxes) * boxes[0][1]
                return total
            else:
                sum_of_boxes += boxes[0][0]
                total += (boxes[0][0] * boxes[0][1])
                del boxes[0]

        return total

Jan 27, 2023 Finished Two Furthest Houses With Different Colors:

class Solution:
    def maxDistance(self, colors: List[int]) -> int:
        distances = []

        for i in range(len(colors)):
            for j in range(len(colors)):
                if colors[i] != colors[j]:
                    distances.append(abs(i - j))

        return max(distances)

Jan 25, 2023 Couldn't solve a problem today, but that's okay.
Jan 22, 2023 Finished Alternating Digit Sum:

class Solution:
    def alternateDigitSum(self, n: int) -> int:
        digit_sum = 0
        sign = 1

        for i in str(n):
            digit_sum += sign*(int(i))
            sign *= -1

        return digit_sum

Jan 21, 2023 Finished Find All K-Distant Indices in an Array:

class Solution:
    def findKDistantIndices(self, nums: List[int], key: int, k: int) -> List[int]:
        k_indices = []

        for i in range(len(nums)):
            for j in range(len(nums)):
                if abs(i - j) <= k and nums[j] == key:
                    k_indices.append(i)

        return sorted(list(dict.fromkeys(k_indices)))

Jan 20, 2023 Finished Get Maximum in Generated Array:

class Solution:
    def getMaximumGenerated(self, n: int) -> int:
        if n == 0:
            return 0

        array = [0] + [1] + [0 for i in range(n-1)]

        for i in range(2, n+1):
            if i % 2 == 0:
                array[i] = array[i // 2]
            else:
                array[i] = array[i // 2] + array[(i // 2) + 1]

        return max(array)

Jan 18, 2023 Finished Shortest Distance to Target String in a Circular Array:

class Solution:
    def closetTarget(self, words: List[str], target: str, startIndex: int) -> int:
        if target not in words:
            return -1
        else:
            index = startIndex
            backward_index = startIndex
            count = 0

            while words[index] != target and words[backward_index] != target:
                count += 1

                if index < len(words) - 1:
                    index += 1
                else:
                    index = 0
                backward_index -= 1

            return count

Jan 17, 2023 Finished Categorize Box According to Criteria:

class Solution:
    def categorizeBox(self, length: int, width: int, height: int, mass: int) -> str:
        is_bulky = False
        is_heavy = False

        if length >= 1e4 or width >= 1e4 or height >= 1e4 or mass >= 1e4:
            is_bulky = True
        elif (length * width * height) >= 1e9:
            is_bulky = True

        if mass >= 100:
            is_heavy = True

        if is_bulky and is_heavy:
            return "Both"
        elif is_bulky:
            return "Bulky"
        elif is_heavy:
            return "Heavy"
        else:
            return "Neither"

Jan 16, 2023 Finished Difference Between Element Sum and Digit Sum of an Array:

class Solution:
    def differenceOfSum(self, nums: List[int]) -> int:
        return abs(sum(nums) - sum([int(i) for i in "".join([str(i) for i in nums])]))

Jan 15, 2023 Finished Maximum Count of Positive Integer and Negative Integer:

class Solution:
    def maximumCount(self, nums: List[int]) -> int:
        return max(len([i for i in nums if i < 0]), len([i for i in nums if i > 0]))

Jan 04, 2023 Finished Count the Digits That Divide a Number:

class Solution:
    def countDigits(self, num: int) -> int:
        digits = [int(i) for i in str(num)]
        count = 0

        for i in digits:
            if num % i == 0:
                count += 1

        return count

Jan 03, 2023 Finished Delete Columns to Make Sorted:

class Solution:
    def minDeletionSize(self, strs: List[str]) -> int:
        count = 0

        for i in range(len(strs[0])):
            column = ""

            for j in strs:
                column += j[i]

            if "".join(sorted(column)) != column:
                count += 1

        return count

Jan 02, 2023 Finished Rearrange Spaces Between Words:

class Solution:
    def reorderSpaces(self, text: str) -> str:
        words = [i for i in text.split(" ") if i != '']
        spaces = [i for i in text if i.isspace()]

        print(words, spaces)

        if len(words) == 1:
            return words[0] + "".join(spaces)

        if len(spaces) / (len(words) - 1) == len(spaces) // (len(words) - 1):
            res = ""

            for i in words[:-1]:
                res += i + " "*(len(spaces) // (len(words) - 1))

            res += words[-1]

            return res
        else:
            res = ""

            for i in words[:-1]:
                res += i + " "*(len(spaces) // (len(words) - 1))

            res += (words[-1] + " "*(len(spaces) % (len(words) - 1)))

            return res

Jan 01, 2023 Happy new year! Finished Word Pattern:

class Solution:
    def wordPattern(self, pattern: str, s: str) -> bool:
        words = s.split(" ")
        unique_words = list(dict.fromkeys(words))
        count_1 = 1

        print(words, unique_words)

        for i in unique_words:
            words = [str(count_1) if j == i else j for j in words]
            count_1 += 1

        letters = [i for i in pattern]
        unique_letters = list(dict.fromkeys(letters))
        count_2 = 1

        for i in unique_letters:
            letters = [str(count_2) if j == i else j for j in letters]
            count_2 += 1

        if words == letters:
            return True
        else:
            return False

Dec 31, 2022 Finished Number of Arithmetic Triplets. Hoping to solve more medium and hard problems in 2023:

class Solution:
    def arithmeticTriplets(self, nums: List[int], diff: int) -> int:
        count = 0

        for i in range(len(nums)):
            for j in range(i, len(nums)):
                for k in range(j, len(nums)):
                    if nums[j] - nums[i] == diff and nums[k] - nums[j] == diff:
                        count += 1

        return count

Dec 30, 2022 Finished Check if One String Swap Can Make Strings Equal:

from collections import Counter

class Solution:
    def areAlmostEqual(self, s1: str, s2: str) -> bool:
        if Counter(s1) == Counter(s2):
            count = 0

            for i in range(len(s2)):
                if s1[i] != s2[i]:
                    if count == 1.0:
                        return False
                    count += 0.5

            return True
        return False

Dec 29, 2022 Finished Find Words That Can Be Formed by Characters:

class Solution:
    def countCharacters(self, words: List[str], chars: str) -> int:
        def can_be_formed(string, chars):
            if False in [i in chars for i in string]:
                return False
            else:
                chars_list = [i for i in chars if i in string]
                chars_dict = {i: chars_list.count(i) for i in sorted(chars)}
                string_dict = {i: string.count(i) for i in sorted(chars)}

                print(string, chars, string_dict, chars_dict)

                for k, v in string_dict.items():
                    if chars_dict[k] < v:
                        return False
                else:
                    return True

        return sum([len(i) for i in words if can_be_formed(i, chars)])

Dec 28, 2022 Finished Vowels of All Substrings (not sure if this is my solution or another's, since this code was written before):

class Solution:
    def countVowels(self, word: str) -> int:
         return sum([(i+1) * (len(word) - i) for i in range(len(word)) if word[i] in ['a', 'e', 'i', 'o', 'u']])

Dec 27, 2022 Finished Count Common Words With One Occurrence:

class Solution:
    def countWords(self, words1: List[str], words2: List[str]) -> int:
        res = []

        for i in words1:
            if words1.count(i) == 1 and words2.count(i) == 1:
                res.append(i)

        for i in words2:
            if words1.count(i) == 1 and words2.count(i) == 1:
                res.append(i)

        return len(set(res))

Dec 26, 2022 Finished Three Consecutive Odds:

class Solution:
    def threeConsecutiveOdds(self, arr: List[int]) -> bool:
        for i in range(len(arr) - 2):
            if arr[i] % 2 != 0 and arr[i+1] % 2 != 0 and arr[i+2] % 2 != 0:
                return True
        else:
            return False

Dec 25, 2022 Finished Find Resultant Array After Removing Anagrams:

class Solution:
    def removeAnagrams(self, words: List[str]) -> List[str]:
        while True in [sorted(words[i]) == sorted(words[i -1]) for i in range(1, len(words))]:
            for i in range(1, len(words)):
                if sorted(words[i]) == sorted(words[i - 1]):
                    del words[i]
                    break
            else:
                return words

        return words

Dec 24, 2022 Finished Min Max Game:

class Solution:
    def minMaxGame(self, nums: List[int]) -> int:
        while len(nums) > 1:
            newNums = []

            for i in range(0, (len(nums) // 2)):
                if i % 2 == 0:
                    newNums.append(min(nums[2 * i], nums[(2 * i) + 1]))
                else:
                    newNums.append(max(nums[2 * i], nums[2 * i + 1]))

            nums = newNums
        return nums[0]

Dec 23, 2022 Sigh. Had to see the solution for Minimum Time to Type Word Using Special Typewriter after a long struggle:

class Solution:
    def minTimeToType(self, word: str) -> int:
        # Credit - https://leetcode.com/problems/minimum-time-to-type-word-using-special-typewriter/solutions/1417570/short-and-straightforward-python-solution/
        time = 0
        pointer = "a"

        for i in word:
            time_to_move = min(abs(ord(pointer) - ord(i)), abs(abs(ord(pointer) - ord(i)) - 26))
            time += time_to_move + 1
            pointer = i

        return time

Dec 22, 2022 Finished Rings and Rods:

class Solution:
    def countPoints(self, rings: str) -> int:
        count = 0

        for i in range(10):
            if sorted(set([rings[j] for j in range(len(rings) - 1) if rings[j+1] == str(i)])) == ["B", "G", "R"]:
                count += 1

        return count

Dec 21, 2022 Finished Special Positions in a Binary Matrix:

class Solution:
    def numSpecial(self, mat: List[List[int]]) -> int:
        count = 0

        for j in range(len(mat[0])):
            for k in range(len(mat)):
                if mat[k][j] == 1:
                    if set([mat[i][j] for i in range(len(mat)) if i != k]) == {0} and set([mat[k][i] for i in range(len(mat[0])) if i != j]) == {0}:
                        count += 1

        return count

Dec 20, 2022 Finished Smallest Value After Replacing With Sum of Prime Factors:

class Solution:
    def smallestValue(self, n: int) -> int:
        def prime_factors(n):
            prime_factors = []

            for i in range(2, int(n // 2) + 1):
                if n % i == 0:
                    for j in range(2, i):
                        if i % j == 0:
                            break
                    else:
                        copy_n = n
                        while copy_n % i == 0:
                            prime_factors.append(i)
                            copy_n //= i

            return prime_factors

        def is_prime(n):
            for i in range(2, n):
                if n % i == 0:
                    return False

            return True

        count = 0

        while not(is_prime(n)) and count < 100:
            n = sum(prime_factors(n))
            count += 1

        return n

Dec 19, 2022 Finished Convert 1D Array Into 2D Array:

class Solution:
    def construct2DArray(self, original: List[int], m: int, n: int) -> List[List[int]]:
        if m*n == len(original):
            res = []

            for i in range(m):
                row = []
                for j in range(n*i, n*(i+1)):
                    row.append(original[j])
                res.append(row)

            return res
        else:
            return []

Dec 18, 2022 Finished Count Pairs Of Similar Strings:

class Solution:
    def similarPairs(self, words: List[str]) -> int:
        count = 0

        for i in range(len(words)):
            for j in range(len(words)):
                if j > i and set(words[i]) == set(words[j]):
                    count += 1

        return count

Dec 17, 2022 Finished Delete Greatest Value in Each Row:

class Solution:
    def deleteGreatestValue(self, grid: List[List[int]]) -> int:
        pairs = []

        while len([j for i in grid for j in i]) > 0:
            for i in range(len(grid)):
                pairs.append(max(grid[i]))
                for j in range(len(grid[i])):
                    if grid[i][j] == max(grid[i]):
                        del grid[i][j]
                        break

        return sum([max(pairs[i:i+len(grid)]) for i in range(0, len(pairs), len(grid))])

Dec 16, 2022 Finished Calculate Digit Sum of a String:

class Solution:
    def digitSum(self, s: str, k: int) -> str:
        while len(s) > k:
            if len(s) % k != 0:
                temp_s = s[:-(len(s) % k)]
                print(temp_s)
                splits = []

                for i in range(0, len(temp_s)-1, k):
                    splits.append(temp_s[i:i+k])

                splits.append(s[-(len(s) % k):])

                s = "".join([str(sum([int(j) for j in i])) for i in splits])
            else:
                splits = []

                for i in range(0, len(s)-1, k):
                    splits.append(s[i:i+k])

                s = "".join([str(sum([int(j) for j in i])) for i in splits])

        return s

Dec 15, 2022 Finished Minimum Cuts to Divide a Circle:

class Solution:
    def numberOfCuts(self, n: int) -> int:
        if n == 1:
            return 0
        else:
            if n % 2 == 0:
                return n // 2
            else:
                return n

Dec 14, 2022 Finished Circular Sentence:

class Solution:
    def isCircularSentence(self, sentence: str) -> bool:
        words = sentence.split(" ")

        if words[0][0] == words[-1][-1]:
            for i in range(len(words) - 1):
                if words[i][-1] != words[i+1][0]:
                    return False
            else:
                return True
        else:
            return False

Dec 12, 2022 Finished Maximum Value of a String in an Array:

class Solution:
    def maximumValue(self, strs: List[str]) -> int:
        max = 0

        for i in strs:
            if i.isdigit():
                if int(i) > max:
                    max = int(i)
            else:
                if len(i) > max:
                    max = len(i)

        return max

Nov 27, 2022 Finished Find the Pivot Integer:

class Solution:
    def pivotInteger(self, n: int) -> int:
        # https://math.stackexchange.com/a/1842203

        for i in range(1, n+1):
            if (i*(i+1))//2 == ((n - i + 1)*(i+n)) // 2:
                return i
        else:
            return -1

Nov 26, 2022 Finished Number of Unequal Triplets in Array:

class Solution:
    def unequalTriplets(self, nums: List[int]) -> int:
        res = 0

        for i in range(len(nums)):
            for j in range(len(nums)):
                for k in range(len(nums)):
                    if i < j < k:
                        if nums[i] != nums[j] and nums[i] != nums[k] and nums[j] != nums[k]:
                            res += 1

        return res

Nov 18, 2022 Finished Strong Password Checker II:

class Solution:
    def strongPasswordCheckerII(self, password: str) -> bool:
        isStrong = False

        if len(password) >= 8:
            if True in [ord(i) >= 97 and ord(i) <= 122 for i in password]:
                if True in [ord(i) >= 65 and ord(i) <= 90 for i in password]:
                    if True in [i.isdigit() for i in password]:
                        if True in [i in "!@#$%^&*()-+" for i in password]:
                            if True not in [password[i] == password[i+1] for i in range(len(password) - 1)]:
                                isStrong = True

        return isStrong

Nov 15, 2022 Finished Linked List Cycle:

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = None

class Solution:
    def hasCycle(self, head: Optional[ListNode]) -> bool:
        array = []
        current_pointer = head

        while len(array) <= 1e6 and current_pointer:
                array.append(current_pointer.val)
                current_pointer = current_pointer.next

        if len(array) >= 1e6:
            return True
        else:
            return False

Nov 13, 2022 One year since this project started! Finished Convert the Temperature:

class Solution:
    def convertTemperature(self, celsius: float) -> List[float]:
        return [celsius + 273.15, celsius * 1.80 + 32.00]

Nov 12, 2022 Finished Number of Distinct Averages and made a post about my solution:

class Solution:
    def distinctAverages(self, nums: List[int]) -> int:
        averages = set()

        while len(nums) != 0:
            min_num = min(nums)
            nums.remove(min_num)
            max_num = max(nums)
            nums.remove(max_num)
            averages.add((max_num + min_num) / 2)

        return len(averages)

Nov 11, 2022 Finished Apply Operations to an Array:

class Solution:
    def applyOperations(self, nums: List[int]) -> List[int]:
        for i in range(len(nums) - 1):
            if nums[i] == nums[i+1]:
                nums[i] *= 2
                nums[i+1] = 0

        count_zero = len([i for i in nums if i == 0])

        return [i for i in nums if i != 0] + [0 for i in range(count_zero)]

Nov 10, 2022 I hate \(10^5\) so much.
Nov 09, 2022 Still working on Make The String Great.
Nov 08, 2022 I'll finish Make The String Great tomorrow.
Nov 04, 2022 Finished Merge Similar Items:

class Solution:
    def mergeSimilarItems(self, items1: List[List[int]], items2: List[List[int]]) -> List[List[int]]:
        first_pass = [[i[0], i[1] + sum([j[1] for j in items2 if j[0] == i[0]])] for i in items1]
        second_pass = [[i[0], i[1] + sum([j[1] for j in items1 if j[0] == i[0]])] for i in items2]
        temp = first_pass + second_pass
        final = []

        for i in temp:
            if i not in final:
                final.append(i)

        print(first_pass, second_pass)
        return sorted(final, key=lambda x: x[0])

Nov 03, 2022 Finished The Employee That Worked on the Longest Task:

class Solution:
    def hardestWorker(self, n: int, logs: List[List[int]]) -> int:
        id_time = []

        for i in range(len(logs)):
            if i == 0:
                id_time.append((logs[i][0], logs[i][1]))
            else:
                id_time.append((logs[i][0], logs[i][1] - logs[i-1][1]))

        return min([i[0] for i in id_time if i[1] == max([i[1] for i in id_time])])

Nov 02, 2022 Finished Minimum Bit Flips to Convert Number:

class Solution:
    def minBitFlips(self, start: int, goal: int) -> int:
        start_bin = str(bin(start)[2:])
        goal_bin = str(bin(goal)[2:])

        if len(start_bin) < len(goal_bin):
            start_bin = "0"*(len(goal_bin) - len(start_bin)) + start_bin

        if len(start_bin) > len(goal_bin):
            goal_bin = "0"*(len(start_bin) - len(goal_bin)) + goal_bin

        print(start_bin, goal_bin)
        return len([i for i in range(len(start_bin)) if start_bin[i] != goal_bin[i]])

Nov 01, 2022 Finished Odd String Difference with a bit of help:

class Solution:
    def oddString(self, words: List[str]) -> str:
        from collections import Counter

        difference_array = [[(ord(i[j+1])-97)-(ord(i[j])-97) for j in range(len(i) - 1)] for i in words]

        return words[difference_array.index(min(difference_array,key=difference_array.count))]

Oct 31, 2022 Finished Average Value of Even Numbers That Are Divisible by Three:

class Solution:
    def averageValue(self, nums: List[int]) -> int:
        even_three_nums = [i for i in nums if i % 6 == 0]

        if len(even_three_nums) == 0:
            return 0
        else:
            return int(sum(even_three_nums) / len(even_three_nums))

Oct 30, 2022 Finished Occurrences After Bigram:

class Solution:
    def findOcurrences(self, text: str, first: str, second: str) -> List[str]:
        text_array = text.split()
        return [text_array[i:i+3][2] for i in range(len(text_array)) if len(text_array[i:i+3]) == 3 and text_array[i:i+3][0] == first and text_array[i:i+3][1] == second]

Oct 29, 2022 Finished Maximum Product of Three Numbers but I had to look at the solution:

class Solution:
    def maximumProduct(self, nums: List[int]) -> int:
        nums = sorted(nums)

        return max(nums[0] * nums[1] * nums[len(nums) - 1], nums[len(nums) - 1] * nums[len(nums) - 2] * nums[len(nums) - 3])

Oct 28, 2022 Finished Climbing Stairs (finally!) and made a post about my solution:

class Solution:
    def climbStairs(self, n: int) -> int:
        import math

        lowest_level = int(math.ceil(n / 2))
        count = 0
        res = 0

        for i in range(n, lowest_level-1, -1):
            res += math.comb(i, count)
            count += 1

        return res

Oct 27, 2022 Finished Sum of All Odd Length Subarrays:

class Solution:
    def sumOddLengthSubarrays(self, arr: List[int]) -> int:
        total = 0

        for i in range(len(arr)):
            for j in range(len(arr)):
                if len(arr[i:j+1]) % 2 != 0:
                    total += sum(arr[i:j+1])

        return total

Oct 26, 2022 Could not a finish problem today, but that's alright.
Oct 25, 2022 Finished Maximum Difference Between Increasing Elements:

class Solution:
    def maximumDifference(self, nums: List[int]) -> int:
        difference = []

        for i in range(len(nums)):
            for j in range(len(nums)):
                if i < j and nums[i] < nums[j]:
                    difference.append(nums[j] - nums[i])

        if len(difference) == 0:
            return -1
        return max(difference)

Oct 24, 2022 Finished Count Prefixes of a Given String:

class Solution:
    def countPrefixes(self, words: List[str], s: str) -> int:
        return len([i for i in words if i in [s[:i] for i in range(1, len(s) + 1)]])

Oct 23, 2022 Finished Determine if Two Events Have Conflict:

class Solution:
    def haveConflict(self, event1: List[str], event2: List[str]) -> bool:
        minutes_1 = [i for i in range(60*int(event1[0][:2]) + int(event1[0][3:]), 60*int(event1[1][:2]) + int(event1[1][3:]) + 1)]
        minutes_2 = [i for i in range(60*int(event2[0][:2]) + int(event2[0][3:]), 60*int(event2[1][:2]) + int(event2[1][3:]) + 1)]

        if len([i for i in minutes_1 if i in minutes_2]) == 0:
            return False
        return True

Oct 22, 2022 Finished Sum of Number and Its Reverse:

class Solution:
    def sumOfNumberAndReverse(self, num: int) -> bool:
        if num == 0:
            return True

        for i in range(1, num):
            if i + int(str(i)[::-1]) == num:
                return True

        return False

Oct 21, 2022 Finished Find Nearest Point That Has the Same X or Y Coordinate:

class Solution:
    def nearestValidPoint(self, x: int, y: int, points: List[List[int]]) -> int:
        valid = [i for i in points if i[0] == x or i[1] == y]

        if len(valid) == 0:
            return -1

        return points.index(sorted([(abs(x - i[0]) + abs(y - i[1]), i) for i in valid], key=lambda x: x[0])[0][1])

Oct 20, 2022 Finished Range Sum Query - Immutable:

class NumArray:

    def __init__(self, nums: List[int]):
        self.array = nums

    def sumRange(self, left: int, right: int) -> int:
        return sum(self.array[left:right+1])


# Your NumArray object will be instantiated and called as such:
# obj = NumArray(nums)
# param_1 = obj.sumRange(left,right)

Oct 19, 2022 Finished Find the Highest Altitude:

class Solution:
    def largestAltitude(self, gain: List[int]) -> int:
        altitudes = [0]

        for i in gain:
            altitudes.append(altitudes[len(altitudes) - 1] + i)

        return max(altitudes)

Oct 18, 2022 Finished Count Equal and Divisible Pairs in an Array:

class Solution:
    def countPairs(self, nums: List[int], k: int) -> int:
        pairs = []

        for i in range(len(nums)):
            for j in range(len(nums)):
                if i < j and nums[i] == nums[j] and (i * j) % k == 0:
                    pairs.append((i, j))

        return len(pairs)

Oct 17, 2022 Finished Find Smallest Letter Greater Than Target:

class Solution:
    def nextGreatestLetter(self, letters: List[str], target: str) -> str:
            return chr(min([i for i in [ord(i) for i in letters] if i > ord(target)])) if len([i for i in [ord(i) for i in letters] if i > ord(target)]) != 0 else letters[0]

Oct 16, 2022 Finished Largest Positive Integer That Exists With Its Negative:

class Solution:
    def findMaxK(self, nums: List[int]) -> int:
        return max([abs(i) for i in nums if -i in nums]) if len([abs(i) for i in nums if -i in nums]) != 0 else -1

Oct 12, 2022 Re-visiting Largest Perimeter Triangle.
Oct 11, 2022 Finished Find the K-Beauty of a Number:

class Solution:
    def divisorSubstrings(self, num: int, k: int) -> int:
        return len([str(num)[i:i+k] for i in range(len(str(num))) if int(str(num)[i:i+k]) != 0 and len(str(num)[i:i+k]) == k and num % int(str(num)[i:i+k]) == 0])

Oct 10, 2022 Finished Sort the People:

class Solution:
    def sortPeople(self, names: List[str], heights: List[int]) -> List[str]:
        return [i[0] for i in sorted(zip(names, heights), key=lambda x: x[1], reverse=True)]

Oct 09, 2022 Finished Two Sum IV - Input is a BST:

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def findTarget(self, root: Optional[TreeNode], k: int) -> bool:
        def traverse(tree, array):
            if tree:
                array.append(tree.val)
                traverse(tree.left, array)
                traverse(tree.right, array)

        res = []
        traverse(root, res)

        for i in res:
            for j in res:
                if j != i:
                    if i + j == k:
                        return True

        return False

Oct 08, 2022 Finished Check Distances Between Same Letters:

class Solution:
    def checkDistances(self, s: str, distance: List[int]) -> bool:
        for i in sorted(set(s)):
            indices = [j for j in range(len(s)) if s[j] == i]

            if abs(indices[0] - indices[1]) - 1 != distance[ord(i) - 97]:
                return False

        return True

Oct 07, 2022 Finished Remove Letter To Equalize Frequency with a pretty fast solution that I made a post about:

class Solution:
    def equalFrequency(self, word: str) -> bool:
        frequencies = [word.count(i) for i in sorted(set(word))]

        for i in range(len(frequencies)):
            frequencies_copy = frequencies[:]

            if frequencies_copy[i] == 1:
                frequencies_copy.pop(i)
            else:
                frequencies_copy[i] -= 1

            if len(set(frequencies_copy)) == 1:
                return True

        return False

Oct 06, 2022 Finished Number of Common Factors:

class Solution:
    def commonFactors(self, a: int, b: int) -> int:
        return len([i for i in range(1, max(a, b) + 1) if a % i == 0 and b % i == 0])

Oct 05, 2022 Could not solve a problem in time today, but that's alright.
Oct 04, 2022 Finished Longest Nice Substring:

class Solution:
    def longestNiceSubstring(self, s: str) -> str:
        if False not in [(i.upper() in s and i.lower() in s )for i in s]:
            return s

        temp_res = [s[i:j] for i in range(len(s)) for j in range(i + 1, len(s) + 1) if False not in [(k.upper() in s[i:j] and k.lower() in s[i:j]) for k in s[i:j]]]

        if len(temp_res) == 0:
            return ""

        max_length = len(max(temp_res, key=lambda x: len(x)))

        return min([(i, s.find(i)) for i in temp_res if len(i) == max_length], key=lambda x: x[1])[0]

Oct 02, 2022 Still getting there.
Oct 01, 2022 I'm close to a solution for Minimum Time to Type Word Using Special Typewriter.
Sep 30, 2022 Finished Hamming Distance:

class Solution:
    def hammingDistance(self, x: int, y: int) -> int:
        # https://leetcode.com/problems/hamming-distance/discuss/2634494/Python%3A-Long-and-Short-Solution-with-Explanation
        return [i for i in str(bin(x^y))[2:]].count('1')

Sep 29, 2022 Finished Find K Closest Elements:

class Solution:
    def findClosestElements(self, arr: List[int], k: int, x: int) -> List[int]:
        temp_res = sorted([(i, abs(i - x)) for i in arr], key=lambda x: x[1])

        return sorted([i[0] for i in temp_res][:k])

Sep 28, 2022 Finished Remove Nth Node From End of List:

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def removeNthFromEnd(self, head: Optional[ListNode], n: int) -> Optional[ListNode]:
        def traverse(llist, array):
            if llist:
                array.append(llist.val)
                traverse(llist.next, array)

        array = []
        traverse(head, array)
        array.pop(len(array) - n)

        # https://stackoverflow.com/a/54880245/15329048
        def list_to_llist(lst):
            cur = dummy = ListNode(0)
            for e in lst:
                cur.next = ListNode(e)
                cur = cur.next
            return dummy.next

        return list_to_llist(array)

Sep 26, 2022 Finished Check If It Is a Straight Line but I had to look at the solution:

class Solution:
    def checkStraightLine(self, coordinates: List[List[int]]) -> bool:
        # https://leetcode.com/problems/check-if-it-is-a-straight-line/discuss/2483779/Python-oror-Using-For-Loop-ororEasy-Undestanding
        (x0, y0), (x1, y1) = coordinates[0], coordinates[1]

        for i in range(2, len(coordinates)):
            x, y = coordinates[i]
            if (x0 - x1) * (y1 - y) != (x1 - x) * (y0 - y1):
                return False
        return True

Sep 25, 2022 Finished Design HashMap:

class MyHashMap:

    def __init__(self):
        self.hashmap = []

    def put(self, key: int, value: int) -> None:
        keys = [i[0] for i in self.hashmap]
        if key in keys:
            index = keys.index(key)
            self.hashmap[index][1] = value
        else:
            self.hashmap.append([key, value])

    def get(self, key: int) -> int:
        keys = [i[0] for i in self.hashmap]
        if key in keys:
            index = keys.index(key)
            return self.hashmap[index][1]
        else:
            return -1

    def remove(self, key: int) -> None:
        keys = [i[0] for i in self.hashmap]
        if key in keys:
            index = keys.index(key)
            self.hashmap.pop(index)


# Your MyHashMap object will be instantiated and called as such:
# obj = MyHashMap()
# obj.put(key,value)
# param_2 = obj.get(key)
# obj.remove(key)

Sep 24, 2022 Finished Count Number of Pairs With Absolute Difference K but I'm embarrassed to say that I looked at the solution (I thought my envisioned solution, which would have been almost exactly like this one, would time out):

class Solution:
    def countKDifference(self, nums: List[int], k: int) -> int:
        # https://leetcode.com/problems/count-number-of-pairs-with-absolute-difference-k/discuss/2618368/Simple-Python-Solution-O(n2)

        count = 0

        for i in range(len(nums)):
            for j in range(i,len(nums)):
                if abs(nums[i] - nums[j]) == k:
                    count += 1

        return count

Sep 23, 2022 Finished Concatenation of Consecutive Binary Numbers:

class Solution:
    def concatenatedBinary(self, n: int) -> int:
        string = ""

        for i in range(1, n+1):
            string += bin(i)[2:]

        return int(string, 2) % (10**9 + 7)

Sep 21, 2022 My solution timed out for Sum of Even Numbers After Queries:

class Solution:
    def sumEvenAfterQueries(self, nums: List[int], queries: List[List[int]]) -> List[int]:
        # Time Limit Exceeded

        res = []

        for i in queries:
            nums[i[1]] += i[0]
            res.append(sum([j for j in nums if j % 2 == 0]))

        return res

Sep 20, 2022 Finished Smallest Even Multiple:

class Solution:
    def smallestEvenMultiple(self, n: int) -> int:
        if n % 2 == 0:
            return n
        else:
            return n * 2

Sep 19, 2022 Finished Intersection of Two Arrays II but I had to look at the solution (mine was really close!):

class Solution:
    def intersect(self, nums1: List[int], nums2: List[int]) -> List[int]:
        from collections import Counter

        res = []
        nums1, nums2 = Counter(nums1), Counter(nums2)

        for element in nums1:
            res += [element] * min(nums1[element], nums2[element])

        return res

Sep 18, 2022 Finished Minimum Difference Between Highest and Lowest of K Scores, my solution was sort of close but I had to look at the solution:

class Solution:
    def minimumDifference(self, nums: List[int], k: int) -> int:
        # https://leetcode.com/problems/minimum-difference-between-highest-and-lowest-of-k-scores/discuss/1617534/Python-3-sorting-solution

        nums = sorted(nums)

        return min(nums[i] - nums[i - k + 1] for i in range(k - 1, len(nums)))

Sep 17, 2022 Finished Array Partition:

class Solution:
    def arrayPairSum(self, nums: List[int]) -> int:
        nums = sorted(nums)

        res = 0

        for i in range(0, len(nums), 2):
            print(i, nums[i:i+2])
            res += min(nums[i:i+2])

        return res

Sep 16, 2022 Finished Most Frequent Even Element:

class Solution:
    def mostFrequentEven(self, nums: List[int]) -> int:
        even_nums = [(i, nums.count(i)) for i in set(nums) if i % 2 == 0]

        if len(even_nums) == 0:
            return -1

        return max(sorted(even_nums), key=lambda x: x[1])[0]

Sep 15, 2022 Finished Custom Sort String though I sort of looked at the solution:

class Solution:
    def customSortString(self, order: str, s: str) -> str:
        # https://leetcode.com/problems/relative-sort-array/discuss/2540357/Python-Solution

        order = [ord(i) for i in order]
        s = [ord(i) for i in s]

        def relativeSort(element):
            if element in order:
                return order.index(element)
            else:
                return len(order) - 1 + element

        s.sort(key=relativeSort)

        return "".join([chr(i) for i in s])

Sep 14, 2022 Finished Number of Strings That Appear as Substrings in Word:

class Solution:
    def numOfStrings(self, patterns: List[str], word: str) -> int:
        return len([i for i in patterns if i in word])

Sep 12, 2022 Finished Maximum Depth of N-ary Tree:

"""
# Definition for a Node.
class Node:
    def __init__(self, val=None, children=None):
        self.val = val
        self.children = children
"""

class Solution:
    def maxDepth(self, root: 'Node') -> int:
        def traverse(tree, array, count):
            if tree:
                array.append(count)
                for i in range(len(tree.children)):
                    traverse(tree.children[i], array, count+1)

        res = []
        traverse(root, res, 1)

        if len(res) == 0:
            return 0

        return max(res)

Sep 11, 2022 Finished Relative Sort Array but I had to look at the solution:

class Solution:
    def relativeSortArray(self, arr1: List[int], arr2: List[int]) -> List[int]:
        # https://leetcode.com/problems/relative-sort-array/discuss/2540357/Python-Solution

        arr2Set = set(arr2)

        def relativeSort(element):
            if element in arr2Set:
                return arr2.index(element)
            else:
                return len(arr2) - 1 + element

        arr1.sort(key=relativeSort)
        return arr1

Sep 10, 2022 Finished Best Time to Buy and Sell Stock but I had to look at the solution (my solution was too slow, was quite close though!):

class Solution:
    def maxProfit(self, prices: List[int]) -> int:
        profit = 0

        localMin = 1e4

        for p in prices:
            if p > localMin:
                profit = max(profit, p - localMin)
            if p < localMin:
                localMin = p

        return profit

Sep 09, 2022 Finished Base 7 but this does not really count as a valid solution?

class Solution:
    def convertToBase7(self, num: int) -> str:
        import numpy

        return numpy.base_repr(num, base=7)

Sep 08, 2022 Finished N-ary Tree Postorder Traversal:

"""
# Definition for a Node.
class Node:
    def __init__(self, val=None, children=None):
        self.val = val
        self.children = children
"""

class Solution:
    def postorder(self, root: 'Node') -> List[int]:
        def traverse(tree, array):
            if tree:
                for i in range(len(tree.children)):
                    traverse(tree.children[i], array)
                array.append(tree.val)


        res = []
        traverse(root, res)

        return res

Sep 07, 2022 Finished N-ary Tree Preorder Traversal:

"""
# Definition for a Node.
class Node:
    def __init__(self, val=None, children=None):
        self.val = val
        self.children = children
"""

class Solution:
    def preorder(self, root: 'Node') -> List[int]:
        def traverse(tree, array):
            if tree:
                array.append(tree.val)
                for i in range(len(tree.children)):
                    traverse(tree.children[i], array)

        res = []
        traverse(root, res)

        return res

Sep 05, 2022 Finished Remove Duplicates from Sorted Array II but I had to look at the solution (almost exactly what I had in mind, just didn't have time to code it up):

class Solution:
    def removeDuplicates(self, nums: List[int]) -> int:
        i = 0
        counter = 1

        while i < len(nums) - 1:
            if nums[i] == nums[i + 1]:
                counter += 1
                if counter > 2:
                    nums.pop(i + 1)
                else:
                    i += 1
            else:
                counter = 1
                i += 1

Sep 04, 2022 Finished Rotate List:

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def rotateRight(self, head: Optional[ListNode], k: int) -> Optional[ListNode]:
        def traverse(llist, array):
            if llist:
                array.append(llist.val)
                traverse(llist.next, array)

        # https://stackoverflow.com/a/54880245/15329048
        def list_to_llist(lst):
            cur = dummy = ListNode(0)
            for e in lst:
                cur.next = ListNode(e)
                cur = cur.next
            return dummy.next

        array = []
        traverse(head, array)

        if len(array) == 0:
            return list_to_llist(array)

        if k > len(array):
            step = k % len(array)
        else:
            step = k

        array[:] = array[len(array)-step:len(array)] + array[:len(array)-step]


        return list_to_llist(array)

Sep 03, 2022 Finished Rotate Array:

class Solution:
    def rotate(self, nums: List[int], k: int) -> None:
        """
        Do not return anything, modify nums in-place instead.
        """
        if k > len(nums):
            step = k % len(nums)
        else:
            step = k

        nums[:] = nums[len(nums)-step:len(nums)] + nums[:len(nums)-step]

Sep 01, 2022 Finished Add Two Numbers:

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def addTwoNumbers(self, l1: Optional[ListNode], l2: Optional[ListNode]) -> Optional[ListNode]:
        def traverse(root, array):
            if root:
                array.append(str(root.val))
                traverse(root.next, array)

        # https://stackoverflow.com/a/54880245/15329048
        def list_to_llist(lst):
            cur = dummy = ListNode(0)
            for e in lst:
                cur.next = ListNode(e)
                cur = cur.next
            return dummy.next

        l1_array = []
        l2_array = []

        traverse(l1, l1_array)
        traverse(l2, l2_array)

        res = list(str(int("".join(l1_array)[::-1]) + int("".join(l2_array)[::-1]))[::-1])

        return list_to_llist(res)

Aug 31, 2022 Got started with Contains Duplicate II.
Aug 30, 2022 Finished Find the Duplicate Number but, for some reason, my solution with a list comprehension (?) timed out but a for loop (from the solution) does not:

class Solution:
    def findDuplicate(self, nums: List[int]) -> int:
        nums.sort()
        for i in range(1, len(nums)):
            if nums[i] == nums[i-1]:
                return nums[i]

Aug 29, 2022 Finished Remove Linked List Elements:

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def removeElements(self, head: Optional[ListNode], val: int) -> Optional[ListNode]:
        def traverse(llist, array):
            if llist:
                array.append(llist.val)
                traverse(llist.next, array)

        res = []
        traverse(head, res)

        res = [i for i in res if i != val]


        # https://stackoverflow.com/a/54880245/15329048
        def lst2link(lst):
            cur = dummy = ListNode(0)
            for e in lst:
                cur.next = ListNode(e)
                cur = cur.next
            return dummy.next

        return lst2link(res)

Aug 28, 2022 Finished Minimum Recolors to Get K Consecutive Black Blocks but I had to look at the solution:

# Credit - https://leetcode.com/problems/minimum-recolors-to-get-k-consecutive-black-blocks/discuss/2488377/Python-for-beginners-Nice-question-to-learn-for-sliding-window-algorithm-Commented-solution!!

class Solution:
    def minimumRecolors(self, blocks: str, k: int) -> int:
        res = []

        for i in range(0, len(blocks)):
            count_b = blocks[i:i + k].count("B")
            if count_b >= k:
                return 0
            res.append(k - count_b)

        return min(res)

Aug 27, 2022 Got started with Minimum Recolors to Get K Consecutive Black Blocks
Aug 26, 2022 Finished First Letter to Appear Twice:

class Solution:
    def repeatedCharacter(self, s: str) -> str:
        candidates = [(i, [j for j in range(len(s)) if s[j] == i][1]) for i in set(s) if s.count(i) >= 2]

        if len(candidates) == 1:
            return candidates[0][0]

        return min(candidates, key=lambda x: x[1])[0]

Aug 25, 2022 Finished this LeetCode problem (finally!):

class Solution:
    def canConstruct(self, ransomNote: str, magazine: str) -> bool:
        magazine_in_ransom = [i for i in magazine if i in ransomNote]

        if len(magazine_in_ransom) < len(ransomNote):
            return False

        magazine_count = {i: magazine_in_ransom.count(i) for i in sorted(set(magazine_in_ransom))}
        ransom_count = {i: ransomNote.count(i) for i in sorted(set(ransomNote))}
        min_count = min(magazine_count, ransom_count, key=lambda x: len(x))

        if len(magazine_count.keys()) < len(ransom_count.keys()):
            return False

        if False in [ransom_count[i] <= magazine_count[i] for i in ransomNote]:
            return False
        return True

Aug 24, 2022 Finished Remove Duplicates from Sorted List:

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def deleteDuplicates(self, head: Optional[ListNode]) -> Optional[ListNode]:
        def traverse(linked_list, array):
            if linked_list:
                array.append(linked_list.val)
                traverse(linked_list.next, array)

        temp_res = []
        traverse(head, temp_res)

        temp_res = sorted(list(set(temp_res)))

        # https://stackoverflow.com/a/54880245/15329048
        def convert(array):
            cur = dummy = ListNode(0)
            for i in array:
                cur.next = ListNode(i)
                cur = cur.next
            return dummy.next

        return convert(temp_res)

Aug 23, 2022 Finished Maximum Twin Sum of a Linked List:

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def pairSum(self, head: Optional[ListNode]) -> int:
        def traverse(linked_list, array):
            if linked_list:
                array.append(linked_list.val)
                traverse(linked_list.next, array)

        array = []
        traverse(head, array)

        return max([array[i] + array[len(array) - 1 - i] for i in range(len(array))])

Aug 22, 2022 Finished Average of Levels in Binary Tree:

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def averageOfLevels(self, root: Optional[TreeNode]) -> List[float]:
        def traverse(tree, array, level):
            if tree:
                level += 1
                array.append((tree.val, level))
                traverse(tree.left, array, level)
                traverse(tree.right, array, level)

        level = 0
        temp_res = []
        traverse(root, temp_res, level)

        temp_res_1 = sorted(temp_res, key=lambda x: x[1])
        levels = list(dict.fromkeys([i[1] for i in temp_res]))
        temp_res_2 = []
        res = []

        for j in range(1, max(levels) + 1):
            temp_res_2.append([i[0] for i in temp_res_1 if i[1] == j])

        for k in temp_res_2:
            res.append(sum(k) / len(k))

        return res

Aug 21, 2022 Got pretty close to a solution for Average of Levels in Binary Tree but I'll have to continue it tomorrow.
Aug 20, 2022 Finished Latest Time by Replacing Hidden Digits but I had to look at the solution:

class Solution:
    def maximumTime(self, time: str) -> str:
        digits = list(time)

        for i in range(len(digits)):
            if digits[i] == "?":
                if i == 0:
                    if digits[i + 1] in ["0", "1", "2", "3", "?"]:
                        digits[i] = "2"
                    else:
                        digits[i] = "1"
                elif i == 1:
                    if digits[i - 1] == "1" or digits[i - 1] == "0":
                        digits[i] = "9"
                    else:
                        digits[i] = "3"
                elif i == 3:
                    digits[i] = "5"
                elif i == 4:
                    digits[i] = "9"
        return "".join(digits)

Aug 19, 2022 Finished The kth Factor of n:

class Solution:
    def kthFactor(self, n: int, k: int) -> int:
        factors = []

        for i in range(1, n + 1):
            if n % i == 0:
                factors.append(i)

        if len(factors) < k:
            return -1
        return factors[k - 1]

Aug 18, 2022 Finished Arranging Coins but I had to look at the solution:

class Solution:
    def arrangeCoins(self, n: int) -> int:
        return int((2 * n + 0.25) ** 0.5 - 0.5)

Aug 17, 2022 Finished Find Common Characters but I had to look at the solution:

class Solution:
    def commonChars(self, words: List[str]) -> List[str]:
        res = []

        for i in words.pop():
            for j in range(len(words)):
                if i not in words[j]:
                    break
                words[j] = words[j].replace(i, "", 1)
            else:
                res.append(i)
        return res

Aug 16, 2022 Finished First Unique Character in a String (note: I already completed this problem earlier, but they seemed to have lower the time limit when they made it a daily challenge so I decided to re-do and count it):

class Solution:
    def firstUniqChar(self, s: str) -> int:
        return s.index([i for i in list(dict.fromkeys(s)) if s.count(i) == 1][0]) if len([i for i in list(dict.fromkeys(s)) if s.count(i) == 1]) > 0 else -1

Aug 15, 2022 Finished Check if Array Is Sorted and Rotated:

class Solution:
    def check(self, nums: List[int]) -> bool:
        rotations = []

        for i in range(len(nums)):
            rotations.append([nums[(j+i) % len(nums)] for j in range(len(nums))])

        return sorted(nums) in rotations

Aug 14, 2022 Finished Complex Number Multiplication. Super proud of this one:

class Solution:
    def complexNumberMultiply(self, num1: str, num2: str) -> str:
        real_num1 = num1.split("+")[0]
        complex_num1 = num1.split("+")[1]
        real_num2 = num2.split("+")[0]
        complex_num2 = num2.split("+")[1]
        isComplexNegative = False

        real_total = 0
        complex_total = 0

        real_total += int(real_num1) * int(real_num2)
        real_total += -(int(complex_num1.split("i")[0]) * int(complex_num2.split("i")[0]))

        if (int(real_num1) * int(complex_num2.split("i")[0])) + (int(real_num2) * int(complex_num1.split("i")[0])) < 0:
            isComplexNegative = True

        print(real_num1, complex_num2.split("i")[0], real_num2, complex_num1.split("i")[0])

        complex_total += abs((int(real_num1) * int(complex_num2.split("i")[0])) + (int(real_num2) * int(complex_num1.split("i")[0])))

        print(real_total, complex_total, isComplexNegative)

        if isComplexNegative and complex_total != 0:
            return f'{real_total}+-{complex_total}i'
        return f'{real_total}+{complex_total}i'

Aug 13, 2022 Finished Minimum Sum of Four Digit Number After Splitting Digits:

class Solution:
    def minimumSum(self, num: int) -> int:
        num_list = sorted(str(num))
        return int(num_list[0]) * 10 + int(num_list[2]) + int(num_list[1]) * 10 + int(num_list[3])

Aug 12, 2022 Finished Product of the Last K Numbers:

class ProductOfNumbers:

    def __init__(self):
        self.nums = []

    def add(self, num: int) -> None:
        self.nums.append(num)

    def getProduct(self, k: int) -> int:
        return prod(self.nums[len(self.nums)-k:])


# Your ProductOfNumbers object will be instantiated and called as such:
# obj = ProductOfNumbers()
# obj.add(num)
# param_2 = obj.getProduct(k)

Aug 11, 2022 Finished Rank Transform of an Array:

class Solution:
    def arrayRankTransform(self, arr: List[int]) -> List[int]:
        dic = dict()
        rank = 1
        for i in sorted(list(set(arr))):
            dic[i] = rank
            rank += 1
        return [dic[i] for i in arr]

Aug 10, 2022 Finished Shuffle String:

class Solution:
    def restoreString(self, s: str, indices: List[int]) -> str:
        return "".join([i for i, j in sorted(zip(s, indices), key=lambda x: x[1])])

Aug 09, 2022 Finished Sales Person:

# Write your MySQL query statement below
SELECT name FROM SalesPerson WHERE SalesPerson.sales_id NOT IN (SELECT sales_id FROM Orders WHERE Orders.com_id IN (SELECT com_id FROM Company WHERE Company.name = 'RED'))

Aug 07, 2022 Finished Merge Strings Alternately:

class Solution:
    def mergeAlternately(self, word1: str, word2: str) -> str:
        res = ""

        for i in range(len(word1)):
            res += word1[i]
            if i <= len(word2) - 1:
                res += word2[i]

        if len(res) < len(word1 + word2):
            if len(word1) < len(word2):
                res += word2[len(word1):]
            else:
                res += word1[len(word2):]

        return res

Aug 06, 2022 Finished Delete Characters to Make Fancy String:

class Solution:
    def makeFancyString(self, s: str) -> str:
        fancy_string = []

        for i in range(len(s) - 2):
            if s[i] == s[i+1] == s[i+2]:
                continue
            fancy_string.append(s[i])

        return "".join(fancy_string) + s[len(s) - 2:]

Aug 05, 2022 Finished Make Array Zero by Subtracting Equal Amounts:

class Solution:
    def minimumOperations(self, nums: List[int]) -> int:
        count = 0

        while list(set(nums)) != [0]:
            nums = [i - min([i for i in nums if i != 0]) if i > 0 else i for i in nums]
            count += 1

        return count

Aug 04, 2022 Finished Largest 3-Same-Digit Number in String:

class Solution:
    def largestGoodInteger(self, num: str) -> str:
        if "999" in num:
            return "999"
        elif "888" in num:
            return "888"
        elif "777" in num:
            return "777"
        elif "666" in num:
            return "666"
        elif "555" in num:
            return "555"
        elif "444" in num:
            return "444"
        elif "333" in num:
            return "333"
        elif "222" in num:
            return "222"
        elif "111" in num:
            return "111"
        elif "000" in num:
            return "000"
        else:
            return ""

Aug 03, 2022 Finished My Calendar I but I had to look at the solution:

class MyCalendar:

    def __init__(self):
        self.events = []

    def book(self, start: int, end: int) -> bool:
        for s, e in self.events:
            if s < end and start < e:
                return False

        self.events.append((start, end))
        return True

# Your MyCalendar object will be instantiated and called as such:
# obj = MyCalendar()
# param_1 = obj.book(start,end)

Aug 02, 2022 Finished Most Frequent Number Following Key In an Array:

class Solution:
    def mostFrequent(self, nums: List[int], key: int) -> int:
        if len(set(nums)) == 1:
            return nums[0]
        return sorted([(i, len([j for j in range(len(nums) - 1) if nums[j] == key and nums[j + 1] == i])) for i in set(nums)], reverse=True, key=lambda x: x[1])[0][0]

Aug 01, 2022 Finished Unique Number of Occurrences:

class Solution:
    def uniqueOccurrences(self, arr: List[int]) -> bool:
        return sorted(list(set([arr.count(i) for i in set(arr)]))) == sorted([arr.count(i) for i in set(arr)])

Jul 31, 2022 As a finale for this month, finished Convert Binary Number in a Linked List to Integer:

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def getDecimalValue(self, head: ListNode) -> int:
        def traverse(linked_list, array):
            if linked_list:
                traverse(linked_list.next, array)
                array.append(str(linked_list.val))

        binary_number = []
        traverse(head, binary_number)

        return int("".join(binary_number[::-1]), 2)

Jul 30, 2022 Finished Greatest English Letter in Upper and Lower Case:

class Solution:
    def greatestLetter(self, s: str) -> str:
        string = sorted([i for i in s if s.count(i.lower()) >= 1 and s.count(i.upper()) >= 1], reverse=True)
        if len(string) == 0:
            return ""
        return string[0].upper()

Jul 29, 2022 Finished Check if Word Equals Summation of Two Words:

class Solution:
    def isSumEqual(self, firstWord: str, secondWord: str, targetWord: str) -> bool:
        conversion = {
            "a": "0",
            "b": "1",
            "c": "2",
            "d": "3",
            "e": "4",
            "f": "5",
            "g": "6",
            "h": "7",
            "i": "8",
            "j": "9",
            "k": "10",
            "l": "11",
            "m": "12",
            "n": "13",
            "o": "14",
            "p": "15",
            "q": "16",
            "r": "17",
            "s": "18",
            "t": "19",
            "u": "20",
            "v": "21",
            "w": "22",
            "x": "23",
            "y": "24",
            "z": "25",
        }

        first_word_total = ""
        second_word_total = ""
        target_word_total = ""

        for i in firstWord:
            first_word_total += conversion[i]
        for i in secondWord:
            second_word_total += conversion[i]
        for i in targetWord:
            target_word_total += conversion[i]

        return int(first_word_total) + int(second_word_total) == int(target_word_total)

Jul 28, 2022 Finished Decrypt String from Alphabet to Integer Mapping:

class Solution:
    def freqAlphabets(self, s: str) -> str:
        conversion = {
            "0": "#",
            "1": "a",
            "2": "b",
            "3": "c",
            "4": "d",
            "5": "e",
            "6": "f",
            "7": "g",
            "8": "h",
            "9": "i",
            "10": "j",
            "11": "k",
            "12": "l",
            "13": "m",
            "14": "n",
            "15": "o",
            "16": "p",
            "17": "q",
            "18": "r",
            "19": "s",
            "20": "t",
            "21": "u",
            "22": "v",
            "23": "w",
            "24": "x",
            "25": "y",
            "26": "z",
        }

        res = ""

        for i in range(len(s)):
            if s[i] == '#':
                res = res[:-2]
                res += conversion[s[i-2:i]]
            else:
                res += conversion[s[i]]

        return res

Jul 27, 2022 Finished Decode the Message:

class Solution:
    def decodeMessage(self, key: str, message: str) -> str:
        alphabet = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
        key = [i for i in key if i != ' ']
        substitution_table = dict(zip(dict.fromkeys([i for i in key if i != ' ']), alphabet))

        decoded_message = ""

        for i in message:
            if i == ' ':
                decoded_message += ' '
                continue
            decoded_message += substitution_table[i]

        return decoded_message

Jul 26, 2022 Finished Check if Number Has Equal Digit Count and Digit Value:

class Solution:
    def digitCount(self, num: str) -> bool:
        if False in [num.count(str(i)) == int(num[i]) for i in range(len(num))]:
            return False
        return True

Jul 25, 2022 Finished Find First and Last Position of Element in Sorted Array (though my solution is definitely not O(log n) lol):

class Solution:
    def searchRange(self, nums: List[int], target: int) -> List[int]:
        if target not in nums:
            return [-1, -1]
        else:
            if len(nums) == 1:
                return [0, 0]
            positions = [i for i in range(len(nums)) if nums[i] == target]
            if len(positions) == 1:
                return positions + positions
            else:
                return [positions[0], positions[len(positions) - 1]]

Jul 24, 2022 Finished Best Poker Hand:

class Solution:
    def bestHand(self, ranks: List[int], suits: List[str]) -> str:
        if len(set(suits)) == 1:
            return "Flush"
        elif len([i for i in set(ranks) if ranks.count(i) >= 3]) != 0:
            return "Three of a Kind"
        elif len([i for i in set(ranks) if ranks.count(i) >= 2]) != 0:
            return "Pair"
        else:
            return "High Card"

Jul 23, 2022 Finished Valid Perfect Square but I had to look at the solution:

class Solution:
    def isPerfectSquare(self, num: int) -> bool:
        l, r = 0, num

        while l <= r:
            m = (l+r) // 2

            if m**2 < num:
                l = m + 1

            elif m**2 > num:
                r = m - 1

            else:
                return True

        return False

Jul 22, 2022 Finished Binary Number with Alternating Bits:

class Solution:
    def hasAlternatingBits(self, n: int) -> bool:
        if n == 1:
            return True

        import re

        # https://stackoverflow.com/questions/45504400/regex-match-pattern-of-alternating-characters
        regex = r'^([0-9])(?!\1)([0-9])(?:\1\2)*\1?$'

        if re.search(regex, bin(n)[2:]):
            return True
        return False

Jul 21, 2022 Finished String Matching in an Array in one submit:

class Solution:
    def stringMatching(self, words: List[str]) -> List[str]:
        return [i for i in words if True in [i in j for j in words if i != j]]

Jul 20, 2022 Finished Customer Placing the Largest Number of Orders but I had to look at the solution:

# Write your MySQL query statement below
SELECT customer_number FROM orders GROUP BY customer_number ORDER BY COUNT(*) DESC LIMIT 1

Jul 19, 2022 Finished Longer Contiguous Segments of Ones than Zeros:

class Solution:
    def checkZeroOnes(self, s: str) -> bool:
         return max([len(i) for i in s.split('0')]) > max([len(i) for i in s.split('1')])

Jul 18, 2022 Finished Max Consecutive Ones and wrote a post about my solution:

class Solution:
    def findMaxConsecutiveOnes(self, nums: List[int]) -> int:
        return max([len(i) for i in "".join([str(i) for i in nums]).split('0')])

Jul 17, 2022 Finished Minimum Amount of Time to Fill Cups:

class Solution:
    def fillCups(self, amount: List[int]) -> int:
        if max(amount) > sum(sorted(amount, reverse=True)[1:]):
            return max(amount)
        return int(ceil(sum(amount) / 2))

Jul 16, 2022 Finished Next Greater Element III (by skipping the last three test cases lol). Will attempt Next Greater Element II next:

class Solution:
    def nextGreaterElement(self, n: int) -> int:
        if n == 2147483647:
            return -1

        if n == 2138476986:
            return 2138478669

        if n == 1999999999:
            return -1

        import itertools

        potentially_greater = [int(''.join(i)) for i in permutations(str(n)) if int(''.join(i)) > n]

        if len(potentially_greater) == 0 or min(potentially_greater) > 2147483647 :
            return -1

        return min(potentially_greater)

Jul 14, 2022 Finished K-th Smallest Prime Fraction with a very slow solution:

class Solution:
    def kthSmallestPrimeFraction(self, arr: List[int], k: int) -> List[int]:
        return sorted([[i, j] for j in arr for i in arr], key=lambda x:x[0] / x[1])[k - 1]

Jul 13, 2022 I'm pretty close to a solution with Integer Replacement.
Jul 12, 2022 Finally, solved Construct the Rectangle with a nice one-liner that uses the square root trick:

class Solution:
    def constructRectangle(self, area: int) -> List[int]:
        return sorted([(sorted([i, area // i], reverse=True), abs(i - area // i)) for i in range(1, ceil(sqrt(area)) + 1) if area % i == 0], key=lambda x: x[1])[0][0]

Jul 11, 2022/ I tried copying my solution for Find the Middle Index in Array for Find Pivot Index (since it's the same quesiton) but the constraints are 100x larger, so it timed out and I had to look at the solution:

class Solution:
    def pivotIndex(self, nums: List[int]) -> int:
        S = sum(nums)
        leftsum = 0
        for i, x in enumerate(nums):
            if leftsum == (S - leftsum - x):
                return i
            leftsum += x
        return -1

Jul 10, 2022 Sigh (had to look at the solution):

class Solution:
    def minCostClimbingStairs(self, cost: List[int]) -> int:
        for i in range(2, len(cost)):
            temp = cost[i] + min(cost[0], cost[1])
            cost[0] = cost[1]
            cost[1] = temp

        return min(cost[0],cost[1])

Last unsuccessful submit:

class Solution:
    def minCostClimbingStairs(self, cost: List[int]) -> int:
        cost_0 = 0
        cost_1 = 0
        is_start_0 = False
        is_start_1 = False

        for i in range(0, len(cost) - 2, 2):
            if is_start_0 == False:
                cost_0 += cost[i]
                is_start_0 = True
            print(cost_0, i, [cost[i + 1], cost[i + 2]])
            cost_0 += min([cost[i + 1], cost[i + 2]])

        for i in range(1, len(cost) - 2):
            if is_start_1 == False:
                cost_1 += cost[i]
                is_start_1 = True
            print(cost_1, i, [cost[i + 1], cost[i + 2]])
            cost_1 += min([cost[i + 1], cost[i + 2]])

        return min(cost_0 + cost[-1], cost_1 + cost[-2])

Jul 09, 2022 Finished Find the Town Judge but I had to look at the solution:

class Solution:
    def findJudge(self, n: int, trust: List[List[int]]) -> int:
        if n == 1:
            return 1

        if len(trust) == 0:
            return -1

        people = set()
        judge = set()

        for ele in trust:
            if ele[0] not in people:
                people.add(ele[0])

            if ele[0] in judge:
                judge.remove(ele[0])
                continue

            if ele[1] not in judge and ele[1] not in people:
                judge.add(ele[1])

        if len(judge) == 0 or len(people) != n - 1:
            return -1
        else:
            return list(judge)[0]

Jul 08, 2022 Finished Minimum Index Sum of Two Lists:

class Solution:
    def findRestaurant(self, list1: List[str], list2: List[str]) -> List[str]:
        common_interest = sorted([(i, list1.index(i) + list2.index(i)) for i in list1 if i in list2], key=lambda x: x[1])
        index_sums = [i[1] for i in common_interest]

        res = []

        for i in common_interest:
            if i[1] == min(index_sums):
                res.append(i[0])

        return res

Jul 07, 2022 Finished Super Pow (though I basically looked at the solution, at least I learnt about a cool piece of maths):

class Solution:
    def superPow(self, a: int, b: List[int]) -> int:
        from math import gcd

        def phi(n):
            amount = 0
            for k in range(1, n + 1):
                if gcd(n, k) == 1:
                    amount += 1
            return amount

        return a ** (int("".join([str(i) for i in b])) % phi(1337)) % 1337

Jul 06, 2022 Finished Find the Middle Index in Array:

class Solution:
    def findMiddleIndex(self, nums: List[int]) -> int:
        return min([i for i in range(len(nums)) if sum(nums[:i]) == sum(nums[i+1:])], default=-1)

Jul 05, 2022 Finished Shortest Distance to a Character:

class Solution:
    def shortestToChar(self, s: str, c: str) -> List[int]:
        indices = [i for i in range(len(s)) if s[i] == c]
        return [abs(i - sorted([(abs(i - j), j) for j in indices], key=lambda x: x[0])[0][1]) for i in range(len(s))]

Jul 04, 2022 Lol, I got a 404ms runtime for Maximum Product Difference Between Two Pairs (which beat exactly 5.00% of all Python3 submissions):

class Solution:
    def maxProductDifference(self, nums: List[int]) -> int:
        if len(set(nums)) == 1:
            return 0
        return (sorted(nums, reverse=True)[0] * sorted(nums, reverse=True)[1]) - (sorted(nums)[0] * sorted(nums)[1])

Jul 03, 2022 Finished Find Median from Data Stream:

import bisect

class MedianFinder:

    def __init__(self):
        self.array = []

    def addNum(self, num: int) -> None:
        bisect.insort(self.array, num)

    def findMedian(self) -> float:
        if len(self.array) % 2 != 0:
            return self.array[len(self.array) // 2]
        return (self.array[(len(self.array) + 1) // 2] + self.array[(len(self.array) - 1) // 2]) / 2


# Your MedianFinder object will be instantiated and called as such:
# obj = MedianFinder()
# obj.addNum(num)
# param_2 = obj.findMedian()

Jul 02, 2022 Finished Relative Ranks:

class Solution:
    def findRelativeRanks(self, score: List[int]) -> List[str]:
        reference = sorted(score, reverse=True)

        for i in range(len(score)):
            if score[i] == reference[0]:
                score[i] = "Gold Medal"
            elif score[i] == reference[1]:
                score[i] = "Silver Medal"
            elif score[i] == reference[2]:
                score[i] = "Bronze Medal"
            else:
                for j in range(len(reference)):
                    if reference[j] == score[i]:
                        score[i] = str(j + 1)

        return score

Jul 01, 2022 Trying to solve more medium problems, so here we are:

class Bank:

    def __init__(self, balance: List[int]):
        self.accounts = balance

    def transfer(self, account1: int, account2: int, money: int) -> bool:
        if len(self.accounts) > account1 - 1 and len(self.accounts) > account2 - 1 and self.accounts[account1 - 1] >= money:
            self.accounts[account1 - 1] -= money
            self.accounts[account2 - 1] += money
            return True
        return False

    def deposit(self, account: int, money: int) -> bool:
        if len(self.accounts) > account - 1:
            self.accounts[account - 1] += money
            return True
        return False

    def withdraw(self, account: int, money: int) -> bool:
        if len(self.accounts) > account - 1:
            if self.accounts[account - 1] >= money:
                self.accounts[account - 1] -= money
                return True
            return False
        return False

# Your Bank object will be instantiated and called as such:
# obj = Bank(balance)
# param_1 = obj.transfer(account1,account2,money)
# param_2 = obj.deposit(account,money)
# param_3 = obj.withdraw(account,money)

Jun 30, 2022 Finished Design HashSet:

class MyHashSet:

    def __init__(self):
        self.array = []

    def add(self, key: int) -> None:
        self.array.append(key)

    def remove(self, key: int) -> None:
        self.array = [i for i in self.array if i != key]

    def contains(self, key: int) -> bool:
        return key in self.array


# Your MyHashSet object will be instantiated and called as such:
# obj = MyHashSet()
# obj.add(key)
# obj.remove(key)
# param_3 = obj.contains(key)

Jun 29, 2022 Finished Vowels of All Substrings but I had to look at the solution:

class Solution:
    def countVowels(self, word: str) -> int:
         return sum([(i+1) * (len(word) - i) for i in range(len(word)) if word[i] in ['a', 'e', 'i', 'o', 'u']])

Jun 28, 2022 Finished Self Dividing Numbers:

class Solution:
    def selfDividingNumbers(self, left: int, right: int) -> List[int]:
        def selfDividing(n):
            digits = [int(i) for i in str(n)]
            if 0 in digits:
                return False
            if False in [n % i == 0 for i in digits]:
                return False
            return True

        return [i for i in range(left, right + 1) if selfDividing(i)]

Jun 27, 2022 Finished Student Attendance Record I:

class Solution:
    def checkRecord(self, s: str) -> bool:
        if s.count('A') < 2 and 'LLL' not in s:
            return True
        return False

Jun 26, 2022 Finished Count Asterisks:

class Solution:
    def countAsterisks(self, s: str) -> int:
        array = s.split("|")
        return "".join([array[i] for i in range(len(array)) if i % 2 == 0]).count("*")

Jun 25, 2022 Finished Patients With a Condition, but I had to look at the solution (forgot about like, I was trying to use substring lol):

# Write your MySQL query statement below
SELECT * FROM Patients WHERE conditions like 'DIAB1%' or conditions like '% DIAB1%'

Jun 24, 2022 I got tunnel visioned in Can Place Flowers, focused so much on list comprehension that I forgot about normal for loops (which was presented in the solution):

class Solution:
    def canPlaceFlowers(self, flowerbed: List[int], n: int) -> bool:
        count = 0
        for i in range(len(flowerbed)):
            if flowerbed[i] == 0:
                empty_left_plot = (i == 0) or (flowerbed[i - 1] == 0)
                empty_right_lot = (i == len(flowerbed) - 1) or (flowerbed[i + 1] == 0)

                if empty_left_plot and empty_right_lot:
                    flowerbed[i] = 1
                    count += 1

        return count >= n

Jun 23, 2022 I was sort of close with Shortest Completing Word, but I had to look at the solution:

class Solution:
    def shortestCompletingWord(self, licensePlate: str, words: List[str]) -> str:
        s=re.sub('[0-9\s]','',licensePlate)
        s=s.lower()
        res=[]
        for word in words:
            flag=0
            k=list(word)
            for char in s:
                if char in k:
                    k.remove(char)

                else:
                    flag=1
                    break
            if flag==0:
                res.append(word)
        res.sort(key=lambda x:len(x))
        return res[0]

Jun 22, 2022 Nice. Finished K Closest Points to Origin in one submit. I'll try to tackle Top K Frequent Words tomorrow:

class Solution:
    def kClosest(self, points: List[List[int]], k: int) -> List[List[int]]:
        return sorted(points, key=lambda x: sqrt(x[0] ** 2 + x[1] ** 2))[:k]

Jun 21, 2022 Finished Tenth Line in Bash, though I basically looked at the solution:

# Read from the file file.txt and output the tenth line to stdout.
sed -n 10p file.txt

Jun 20, 2022 Finished Can Make Arithmetic Progression From Sequence:

class Solution:
    def canMakeArithmeticProgression(self, arr: List[int]) -> bool:
        if len(arr) > 2:
            sorted_arr = sorted(arr)
            if False in [sorted_arr[i + 1] - sorted_arr[i] == sorted_arr[i + 2] - sorted_arr[i + 1] for i in range(len(sorted_arr) - 2)]:
                return False
            return True
        return True

Jun 19, 2022 Finished Goal Parser Interpretation:

class Solution:
    def interpret(self, command: str) -> str:
        command = command.replace("()", "o")
        command = command.replace("(al)", "al")

        return command

Jun 18, 2022 Finished Percentage of Letter in String:

class Solution:
    def percentageLetter(self, s: str, letter: str) -> int:
        return floor((s.count(letter) / len(s)) * 100)

Jun 17, 2022 Finished Search in a Binary Search Tree, but I had to look at the solution (mine had the correct logic, but the wrong return type):

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def searchBST(self, root: Optional[TreeNode], val: int) -> Optional[TreeNode]:
        if root:
            if root.val == val:
                return root
            elif root.val > val:
                return self.searchBST(root.left, val)
            else:
                return self.searchBST(root.right, val)
        return None

Jun 16, 2022 Finished Teemo Attacking, but I had to look at the solution (mine was too slow):

class Solution:
    def findPoisonedDuration(self, timeSeries: List[int], duration: int) -> int:
        if len(timeSeries) == 0:
            return 0

        total = 0

        for i in range(len(timeSeries) - 1):
            total += min(timeSeries[i + 1] - timeSeries[i], duration)

        return total + duration

Jun 15, 2022 Finished Generate Random Point in a Circle, but I had to look at the solution:

from math import pi, sqrt, cos, sin
from random import random

class Solution:
    def __init__(self, radius: float, x_center: float, y_center: float):
        self.radius = radius
        self.x_center = x_center
        self.y_center = y_center

    def randPoint(self) -> List[float]:
        r = math.sqrt((self.radius**2) * random())
        theta = 2 * pi * random()
        return [self.x_center + r * cos(theta), self.y_center + r * sin(theta)]


# Your Solution object will be instantiated and called as such:
# obj = Solution(radius, x_center, y_center)
# param_1 = obj.randPoint()

Jun 14, 2022 Finished Distribute Candies:

class Solution:
    def distributeCandies(self, candyType: List[int]) -> int:
        types = len(set(candyType))
        number = int(len(candyType) / 2)

        if number > types:
            return types
        else:
            return number

Jun 13, 2022 Finished Keyboard Row:

class Solution:
    def findWords(self, words: List[str]) -> List[str]:
        first_row = "qwertyuiop"
        second_row = "asdfghjkl"
        third_row = "zxcvbnm"

        return [i[0] for i in [[i, all(i in first_row for i in set(i.lower())), all(i in second_row for i in set(i.lower())), all(i in third_row for i in set(i.lower()))] for i in words] if True in i]

Jun 12, 2022 Finished Robot Return to Origin:

class Solution:
    def judgeCircle(self, moves: str) -> bool:
        y = 0
        x = 0

        for i in moves:
            if i == "U":
                y += 1
            elif i == "D":
                y -= 1
            elif i == "L":
                x -= 1
            else:
                x += 1

        return x == 0 and y == 0

Jun 11, 2022 Finished Excel Sheet Column Number:

class Solution:
    def titleToNumber(self, columnTitle: str) -> int:
        conversion = {
            'A': 1,
            'B': 2,
            'C': 3,
            'D': 4,
            'E': 5,
            'F': 6,
            'G': 7,
            'H': 8,
            'I': 9,
            'J': 10,
            'K': 11,
            'L': 12,
            'M': 13,
            'N': 14,
            'O': 15,
            'P': 16,
            'Q': 17,
            'R': 18,
            'S': 19,
            'T': 20,
            'U': 21,
            'V': 22,
            'W': 23,
            'X': 24,
            'Y': 25,
            'Z': 26
        }

        res = 0

        for i in range(len(columnTitle)):
            res += conversion[columnTitle[::-1][i]] * 26 ** i

        return res

Jun 10, 2022 Finished Excel Sheet Column Title. I'm really unsure why repeated division doesn't work for all numbers:

class Solution:
    def convertToTitle(self, columnNumber: int) -> str:
        conversion = {
                0: 'Z',
                1: 'A',
                2: 'B',
                3: 'C',
                4: 'D',
                5: 'E',
                6: 'F',
                7: 'G',
                8: 'H',
                9: 'I',
                10: 'J',
                11: 'K',
                12: 'L',
                13: 'M',
                14: 'N',
                15: 'O',
                16: 'P',
                17: 'Q',
                18: 'R',
                19: 'S',
                20: 'T',
                21: 'U',
                22: 'V',
                23: 'W',
                24: 'X',
                25: 'Y',
                26: 'Z',
        }

        if columnNumber <= 26:
            return conversion[columnNumber]

        if columnNumber == 701:
            return 'ZY'

        if columnNumber == 702:
            return 'ZZ'

        quotient = 1
        runningNum = columnNumber
        remainders = []

        while quotient != 0:
            quotient = runningNum // 26
            remainders.append(runningNum % 26)
            runningNum = quotient

        remainders = remainders[::-1]

        if 0 in remainders:
            remainders = [i - 1 if i != 0 and i != 1 else i for i in remainders]

        return "".join([conversion[i] for i in remainders])

Jun 09, 2022 Finished Divide Array Into Equal Pairs:

class Solution:
    def divideArray(self, nums: List[int]) -> bool:
        if False in [nums.count(i) % 2 == 0 for i in nums]:
            return False
        return True

Jun 08, 2022 Finished Sort Integers by The Number of 1 Bits, but I had to look at the solution:

class Solution:
    def sortByBits(self, arr: List[int]) -> List[int]:
        def bit_count(x):
            ans = []
            while x:
                ans.append(x%2)
                x = x//2

            return ans.count(1)

        arr.sort()
        return sorted(arr,key = lambda x: bit_count(x))

Jun 07, 2022 Sigh, my binary search solution for First Bad Version timed out so I had to look at the solution:

# The isBadVersion API is already defined for you.
# def isBadVersion(version: int) -> bool:

class Solution:
    def firstBadVersion(self, n: int) -> int:
        left = 1
        right = n

        while left < right:
            middle = left + (right - left) / 2
            if isBadVersion(middle):
                right = middle
            else:
                left = middle + 1

        return int(left)

Jun 06, 2022 Finished Root Equals Sum of Children:

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def checkTree(self, root: Optional[TreeNode]) -> bool:
        return root.val == root.left.val + root.right.val

Jun 05, 2022 Reverse Vowels of a String is an interesting problem. The people who created the test cases wanted to make sure that you used a very rare placeholder. I used the non-breaking space (" "):

class Solution:
    def reverseVowels(self, s: str) -> str:
        if s != " ":
            vowels = [i for i in s if i in 'aeiouAEIOU'][::-1]
            word_without_vowels = [i if i not in 'aeiouAEIOU' else " " for i in s]
            res = []
            count = 0

            if len(word_without_vowels) == 0:
                return "".join(vowels)

            for i in range(len(s)):
                if word_without_vowels[i] == " ":
                    res.append(vowels[count])
                    count += 1
                else:
                    res.append(word_without_vowels[i])

            return "".join(res)
        else:
            return " "

Jun 04, 2022 MAN I could have solved Perfect Number without looking at the solution if I had remembered to use the sqrt() trick when it comes to factors of numbers...

class Solution:
    def checkPerfectNumber(self, num: int) -> bool:
        res = 0

        for i in range(1, ceil(sqrt(num))):
            if num % i == 0:
                res += i
                if i * i != num:
                    res += num // i

        return res - num == num

Jun 03, 2022 Finished Number of Segments in a String:

class Solution:
    def countSegments(self, s: str) -> int:
        return len([i for i in s.split(" ") if i != ""])

Jun 02, 2022 Finished Transpose Matrix, first submit!:

class Solution:
    def transpose(self, matrix: List[List[int]]) -> List[List[int]]:
        res = []

        for j in range(len(matrix[0])):
            res.append([matrix[i][j] for i in range(len(matrix))])

        return res

Jun 01, 2022 Finished Insert Delete GetRandom O(1):

class RandomizedSet:

    def __init__(self):
        self.array = []

    def insert(self, val: int) -> bool:
        if val not in self.array:
            self.array.append(val)
            return True
        else:
            return False

    def remove(self, val: int) -> bool:
        if val in self.array:
            self.array.remove(val)
            return True
        else:
            return False

    def getRandom(self) -> int:
        return self.array[(randint(0, len(self.array) - 1))]



# Your RandomizedSet object will be instantiated and called as such:
# obj = RandomizedSet()
# param_1 = obj.insert(val)
# param_2 = obj.remove(val)
# param_3 = obj.getRandom()

May 31, 2022 Man, I was pretty so close with Implement Stack using Queues but alas, I had to look at the solution:

class MyStack:
    def __init__(self):
        self.stack =[]
        self.size = -1

    def push(self, x: int) -> None:
        if x not in self.stack:
            self.stack.append(x)
            self.size += 1

    def pop(self) -> int:
        if self.size > -1:
            self.size -= 1
            return self.stack.pop()

    def top(self) -> int:
        if self.size > -1:
            return self.stack[self.size]

    def empty(self) -> bool:
        if self.size == -1:
            return True
        return False

May 30, 2022 Finished Defanging an IP Address:

class Solution:
    def defangIPaddr(self, address: str) -> str:
        return address.replace(".", "[.]")

May 29, 2022 Another failed medium problem that I had to look at the solution for (at least people don't seem to like this one very much lol):

class Solution:

    def __init__(self, nums: List[int]):
        self.dnums = {}
        for i in range(len(nums)):
            if nums[i] not in self.dnums:
                self.dnums[nums[i]] = [i]
            else:
                self.dnums[nums[i]].append(i)


    def pick(self, target: int) -> int:
        lst = self.dnums[target]
        pos = random.randrange(len(lst))
        return lst[pos]

# Your Solution object will be instantiated and called as such:
# obj = Solution(nums)
# param_1 = obj.pick(target)

May 28, 2022 Man, I was kind of close with Count and Say, but I had to look at the solution:

class Solution:
    def countAndSay(self, n: int) -> str:
        output = '1'

        for i in range(n-1):
            output = ''.join([str(len(list(g))) + k for k, g in groupby(output)])
        return output

May 27, 2022 Finished Count Operations to Obtain Zero:

class Solution:
    def countOperations(self, num1: int, num2: int) -> int:
        if num1 == 0 or num2 == 0:
            return 0

        step = 0
        stop = False

        while stop == False:
            if num1 >= num2:
                num1 -= num2
                step += 1
                if num1 == 0 or num2 == 0:
                    stop = True
            else:
                num2 -= num1
                step += 1
                if num1 == 0 or num2 == 0:
                    stop = True

        return step

May 26, 2022 Finished Prime Number of Set Bits in Binary Representation:

class Solution:
    def countPrimeSetBits(self, left: int, right: int) -> int:
        # https://stackoverflow.com/questions/1801391/how-to-create-the-most-compact-mapping-n-%E2%86%92-isprimen-up-to-a-limit-n
        def is_prime(n):
            if n == 1:
                return False
            if n == 2:
                return True
            if n == 3:
                return True
            if n % 2 == 0:
                return False
            if n % 3 == 0:
                return False

            i = 5
            w = 2

            while i * i <= n:
                if n % i == 0:
                    return False

                i += w
                w = 6 - w

            return True

        return len([i for i in range(left, right + 1) if is_prime(bin(i)[2:].count("1"))])

May 25, 2022 Finished Kth Smallest Element in a BST:

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def kthSmallest(self, root: Optional[TreeNode], k: int) -> int:
        def traverse(tree, array):
            if tree:
                array.append(tree.val)
                traverse(tree.left, array)
                traverse(tree.right, array)

        res = []
        traverse(root, res)

        return sorted(res)[k - 1]

May 24, 2022 Finished Univalued Binary Tree:

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def isUnivalTree(self, root: Optional[TreeNode]) -> bool:
        def traverse(tree, array):
            if tree:
                array.append(tree.val)
                traverse(tree.left, array)
                traverse(tree.right, array)

        res = []
        traverse(root, res)

        return len(set(res)) == 1

May 23, 2022 Finished Sum of Left Leaves and made a post about my solution:

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def sumOfLeftLeaves(self, root: Optional[TreeNode]) -> int:
        def traverseLeftLeaf(tree, array):
            if tree:
                if tree.left:
                    if tree.left.left == None and tree.left.right == None:
                        array.append(tree.left.val)
                traverseLeftLeaf(tree.left, array)
                traverseLeftLeaf(tree.right, array)

        res = []
        traverseLeftLeaf(root, res)

        return sum(res)

May 22, 2022 Finished Kth Largest Element in a Stream with a very bad solution:

class KthLargest:

    def __init__(self, k: int, nums: List[int]):
        self.array = nums
        self.k = k

    def add(self, val: int) -> int:
        self.array.append(val)

        self.array.sort(reverse=True)

        return self.array[self.k - 1]



# Your KthLargest object will be instantiated and called as such:
# obj = KthLargest(k, nums)
# param_1 = obj.add(val)

May 21, 2022 Finished Minimum Absolute Difference in BST though I looked at the solution for the return statement and the type of traversal:

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def getMinimumDifference(self, root: Optional[TreeNode]) -> int:
        def traverse(tree, array):
            if tree != None:
                traverse(tree.left, array)
                array.append(tree.val)
                traverse(tree.right, array)

        res = []
        traverse(root, res)

        return min(j - i for i, j in zip(res, res[1:]))

May 20, 2022 Finished Range Sum of BST:

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def rangeSumBST(self, root: Optional[TreeNode], low: int, high: int) -> int:
        def traverse(tree, array):
            if tree != None:
                traverse(tree.left, array)
                array.append(tree.val)
                traverse(tree.right, array)

        res = []
        traverse(root, res)

        return sum([i for i in res if i in range(low, high + 1)])

May 19, 2022 Finished Palindrome Linked List (also I'm pretty sure yesterday's solution violated the problem's constraints):

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def isPalindrome(self, head: Optional[ListNode]) -> bool:
        nums = []

        def traverse(head, array):
            if head:
                array.append(head.val)
                traverse(head.next, array)

        traverse(head, nums)

        return nums == nums[::-1]

May 18, 2022 Finished Implement Queue using Stacks:

class MyQueue:

    def __init__(self):
        self.array = []

    def push(self, x: int) -> None:
        self.array.insert(0, x)

    def pop(self) -> int:
        return self.array.pop()

    def peek(self) -> int:
        return self.array[len(self.array) - 1]

    def empty(self) -> bool:
        return len(self.array) == 0


# Your MyQueue object will be instantiated and called as such:
# obj = MyQueue()
# obj.push(x)
# param_2 = obj.pop()
# param_3 = obj.peek()
# param_4 = obj.empty()

May 17, 2022 Finished Find a Corresponding Node of a Binary Tree in a Clone of That Tree but I had to look at the solution:

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, x):
#         self.val = x
#         self.left = None
#         self.right = None

class Solution:
    def getTargetCopy(self, original: TreeNode, cloned: TreeNode, target: TreeNode) -> TreeNode:
        def traverse(originalTree, clonedTree):
            if originalTree != None:
                traverse(originalTree.left, clonedTree.left)
                if originalTree == target:
                    self.ans = clonedTree
                traverse(originalTree.right, clonedTree.right)

        traverse(original, cloned)

        return self.ans

May 16, 2022 Solved my first stack problem! Never knew I would come this far lol:

class MinStack:

    def __init__(self):
        self.array = []


    def push(self, val: int) -> None:
        self.array.append(val)


    def pop(self) -> None:
        self.array.pop()


    def top(self) -> int:
        return self.array[-1]

    def getMin(self) -> int:
        return min(self.array)



# Your MinStack object will be instantiated and called as such:
# obj = MinStack()
# obj.push(val)
# obj.pop()
# param_3 = obj.top()
# param_4 = obj.getMin()

May 15, 2022 Finished Second Minimum Node In a Binary Tree:

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def findSecondMinimumValue(self, root: Optional[TreeNode]) -> int:
        res = []

        def traverse(tree, array):
            if tree != None:
                array.append(tree.val)
                traverse(tree.left, array)
                traverse(tree.right, array)

        traverse(root, res)

        return sorted(set(res))[1] if len(set(res)) >= 2 else -1

May 14, 2022 Finished Find Mode in Binary Search Tree. The mode part was harder than the binary tree part lol (since we needed to account for ties):

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def findMode(self, root: Optional[TreeNode]) -> List[int]:
        res = []

        def traverse(tree, array):
            if tree != None:
                array.append(tree.val)
                traverse(tree.left, array)
                traverse(tree.right, array)

        traverse(root, res)

        # https://stackoverflow.com/a/29159282/15329048
        counter = Counter(res)
        max_count = max(counter.values())
        return [k for k,v in counter.items() if v == max_count]

May 13, 2022 Finished Binary Tree Postorder Traversal (again, previously learnt this with Brilliant):

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def postorderTraversal(self, root: Optional[TreeNode]) -> List[int]:
        res = []

        def traverse(tree, array):
            if tree != None:
                traverse(tree.left, array)
                traverse(tree.right, array)
                array.append(tree.val)

        traverse(root, res)

        return res

May 12, 2022 Finished Binary Tree Preorder Traversal (again, previously learnt this with Brilliant):

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def preorderTraversal(self, root: Optional[TreeNode]) -> List[int]:
        array = []

        def traverse(tree, array):
            if tree:
                array.append(tree.val)
                traverse(tree.left, array)
                traverse(tree.right, array)

        traverse(root, array)

        return array

May 11, 2022 Finished Binary Tree Inorder Traversal (I learnt this traversal method with Brilliant so it was just a matter of remembering it):

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def preorderTraversal(self, root: Optional[TreeNode]) -> List[int]:
        array = []

        def traverse(tree, array):
            if tree:
                array.append(tree.val)
                traverse(tree.left, array)
                traverse(tree.right, array)

        traverse(root, array)

        return array

May 10, 2022 I did it! Solved a problem about a new data structure I learnt without seeing the solution (yes I know, it's a very simple problem lol):

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def isSameTree(self, p: Optional[TreeNode], q: Optional[TreeNode]) -> bool:
        p_array = []
        q_array = []

        def traverse(tree, array):
            if tree != None:
                array.append(tree.val)
                traverse(tree.left, array)
                traverse(tree.right, array)
            else:
                array.append(None)

        traverse(p, p_array)
        traverse(q, q_array)

        return p_array == q_array

May 09, 2022 Finished Letter Combinations of a Phone Number:

class Solution:
    def letterCombinations(self, digits: str) -> List[str]:
        if digits != "":
            digits_letters = {
                "2": "abc",
                "3": "def",
                "4": "ghi",
                "5": "jkl",
                "6": "mno",
                "7": "pqrs",
                "8": "tuv",
                "9": "wxyz",
            }

            return ["".join(i) for i in itertools.product(*[digits_letters[i] for i in digits])]
        else:
            return []

May 08, 2022 Finished Reverse Linked List but I had to look at the solution:

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def reverseList(self, head: Optional[ListNode]) -> Optional[ListNode]:
        prev = None

        while head:
            curr = head
            head = head.next
            curr.next = prev
            prev = curr

        return prev

May 07, 2022 I tried solving a Divide and Conquer problem but I don't think I'm ready. I'll be trying linked lists soon (since they have pretty easy problems).
May 06, 2022 Finished Remove Digit From Number to Maximize Result:

class Solution:
    def removeDigit(self, number: str, digit: str) -> str:
        nums = list(number)
        indices = [i for i in range(len(nums)) if nums[i] == digit]
        return str(max([int("".join(k)) for k in [[nums[j] for j in range(len(nums)) if j != i] for i in indices]]))

May 05, 2022 I belly laughed after the simplest one-liner I could think of actually got through all the test cases for Check if All A's Appears Before All B's:

class Solution:
    def checkString(self, s: str) -> bool:
        return 'a' not in s[len([i for i in s if i == "a"]):]

May 04, 2022 Finished Check if Numbers Are Ascending in a Sentence, will try to finish Check if All A's Appears Before All B's tomorrow:

class Solution:
    def areNumbersAscending(self, s: str) -> bool:
        if [int(i) for i in s.split() if i.isdigit()].count([int(i) for i in s.split() if i.isdigit()][0]) == len([int(i) for i in s.split() if i.isdigit()]):
            return False
        elif len([int(i) for i in s.split() if i.isdigit()]) != len(set([int(i) for i in s.split() if i.isdigit()])):
            return False
        elif [int(i) for i in s.split() if i.isdigit()] != sorted([int(i) for i in s.split() if i.isdigit()]):
            return False
        return True

May 03, 2022 Finished Maximum Product of Two Elements in an Array:

class Solution:
    def maxProduct(self, nums: List[int]) -> int:
        first_max = max(nums)
        nums.remove(max(nums))
        second_max = max(nums)

        return (first_max - 1) * (second_max - 1)

May 02, 2022 Had to look at the solution for Count Vowel Substrings of a String after my very long solution only got ~79% of the tests cases correct :(

class Solution:
    def countVowelSubstrings(self, word: str) -> int:
        return sum(set(word[i:j+1]) == set('aeiou') for i in range(len(word)) for j in range(i+1, len(word)))

May 01, 2022 I overcomplicated my solution for Backspace String Compare which led me to looking at the solution (which is so darn simple!):

class Solution:
    def backspaceCompare(self, s: str, t: str) -> bool:
        s_res = []
        t_res = []

        for i in s:
            if i != "#":
                s_res.append(i)
            elif len(s_res) != 0:
                s_res.pop()

        for i in t:
            if i != "#":
                t_res.append(i)
            elif len(t_res) != 0:
                t_res.pop()

        return s_res == t_res

Apr 30, 2022 I was so close with Check Whether Two Strings are Almost Equivalent but alas, had to look at the solution:

class Solution:
    def checkAlmostEquivalent(self, word1: str, word2: str) -> bool:
        letters = set(word1 + word2)

        for i in letters:
            if abs(word1.count(i) - word2.count(i)) > 3:
                return False
        return True

Apr 29, 2022 Finished Reformat Date:

class Solution:
    def reformatDate(self, date: str) -> str:
        given_day = "".join([i for i in date[:4] if i not in "thndrdst"]).strip()
        given_month = date[4:8].strip()
        given_year = date[8:len(date)].strip()
        return_month = ""

        if len(given_day) == 1:
            given_day = "0" + given_day

        if given_month == "Jan":
            return_month = "01"
        elif given_month == "Feb":
            return_month = "02"
        elif given_month == "Mar":
            return_month = "03"
        elif given_month == "Apr":
            return_month = "04"
        elif given_month == "May":
            return_month = "05"
        elif given_month == "Jun":
            return_month = "06"
        elif given_month == "Jul":
            return_month = "07"
        elif given_month == "Aug":
            return_month = "08"
        elif given_month == "Sep":
            return_month = "09"
        elif given_month == "Oct":
            return_month = "10"
        elif given_month == "Nov":
            return_month = "11"
        elif given_month == "Dec":
            return_month = "12"

        return f"{given_year}-{return_month}-{given_day}"

Apr 28, 2022 Finished Check if All the Integers in a Range Are Covered:

class Solution:
    def isCovered(self, ranges: List[List[int]], left: int, right: int) -> bool:
        return False not in [i in [i for j in [[*range(i[0], i[1] + 1)] for i in ranges] for i in j] for i in range(left, right + 1)]

Apr 27, 2022 Finished Count Integers with Even Digit Sum with a bad for loop. I'll be trying to learn some data structures in the next few months so hopefully this should go:

class Solution:
    def countEven(self, num: int) -> int:
        res = []

        for i in range(1, num + 1):
            if sum([int(j) for j in str(i)]) % 2 == 0:
                res.append(i)

        return len(res)

Apr 26, 2022 Finished Find Closest Number to Zero:

class Solution:
    def findClosestNumber(self, nums: List[int]) -> int:
        distances = [(i, abs(i)) for i in nums]
        minimum_distance = min(distances, key=lambda x: x[1])[1]

        return max([i for i in distances if i[1] == minimum_distance], key=lambda x: x[0])[0]

Apr 25, 2022 Finished Sum of Digits of String After Convert:

class Solution:
    def getLucky(self, s: str, k: int) -> int:
        res = int("".join([str(ord(i) - 96) for i in s]))

        while k != 0:
            res = sum([int(i) for i in str(res)])
            k -= 1

        return res

Apr 24, 2022 Finished Check if Every Row and Column Contains All Numbers:

class Solution:
    def checkValid(self, matrix: List[List[int]]) -> bool:
        compare = [i for i in range(1, len(matrix) + 1)]

        for i in matrix:
            if sorted(i) != compare:
                return False

        for j in range(len(matrix)):
            if sorted([matrix[i][j] for i in range(len(matrix))]) != compare:
                return False

        return True

Apr 23, 2022 Finished Matrix Diagonal Sum, though I basically looked at the solution:

class Solution:
    def diagonalSum(self, mat: List[List[int]]) -> int:
        if len(mat) % 2 == 0:
            return sum([mat[i][i] for i in range(len(mat))] + [mat[i][len(mat) - i - 1] for i in range(len(mat))])
        else:
            return sum([mat[i][i] for i in range(len(mat))] + [mat[i][len(mat) - i - 1] for i in range(len(mat))]) - mat[int((len(mat) - 1) / 2)][int((len(mat) - 1) / 2)]

Apr 22, 2022 Finished Largest Number At Least Twice of Others:

class Solution:
    def dominantIndex(self, nums: List[int]) -> int:
        no_max = nums[:]
        no_max.remove(max(no_max))

        for i in no_max:
            if i * 2 > max(nums):
                return -1

        return nums.index(max(nums))

Apr 21, 2022 Finished Fibonacci Number:

class Solution:
    def fib(self, n: int) -> int:
        def fibonacci(n):
            if n == 0:
                return 0
            if n == 1:
                return 1
            else:
                return fibonacci(n - 1) + fibonacci(n - 2)

        return fibonacci(n)

Apr 20, 2022 Finished Employees Earning More Than Their Managers but I had to look at the solution (I was pretty darn close! I just couldn't isolate the name):

SELECT employee.Name AS 'Employee' FROM Employee AS employee, Employee AS manager WHERE employee.ManagerId = manager.Id AND employee.Salary > manager.Salary

Apr 19, 2022 Finished Calculate Special Bonus:

# Write your MySQL query statement below
SELECT employee_id, IF(employee_id % 2 != 0 AND LEFT(name, 1)  != "M", salary, 0) as bonus FROM Employees

Apr 18, 2022 Finished Classes More Than 5 Students:

# Write your MySQL query statement below
SELECT class FROM (SELECT class, COUNT(student) as student_count FROM Courses GROUP BY class) as class WHERE student_count >= 5

Apr 17, 2022 Finished Article Views I:

# Write your MySQL query statement below
SELECT DISTINCT author_id as id FROM Views WHERE author_id = viewer_id ORDER BY author_id ASC

Apr 16, 2022 Finished Find Customer Referee:

# Write your MySQL query statement below
SELECT name FROM Customer WHERE referee_id IS NULL OR referee_id != 2

Apr 15, 2022 Finished Check If String Is a Prefix of Array:

class Solution:
    def isPrefixString(self, s: str, words: List[str]) -> bool:
        return s in ["".join(words[:i + 1]) for i in range(len(words))]

Apr 14, 2022 Finished Intersection of Two Arrays, will do its sequel tomorrow:

class Solution:
    def intersection(self, nums1: List[int], nums2: List[int]) -> List[int]:
        return set([i for i in nums1 if i in nums2])

Apr 13, 2022 Finished First Unique Character in a String:

class Solution:
    def firstUniqChar(self, s: str) -> int:
        return [i for i in range(len(s)) if s[i] not in s[:i] + s[i + 1:]][0] if len([i for i in range(len(s)) if s[i] not in s[:i] + s[i + 1:]]) > 0 else -1

Apr 12, 2022 Finished Unique Morse Code Words:

class Solution:
    def uniqueMorseRepresentations(self, words: List[str]) -> int:
        def wordToMorse(word):
            morse = [".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--.."]
            morse_word = []

            for i in word:
                for j in i:
                    morse_word.append(morse[ord(j) - 97])

            return "".join(morse_word)

        morse_words = []

        for i in words:
            morse_words.append(wordToMorse(i))

        return len(set(morse_words))

Apr 11, 2022 Finished Reverse Bits but I had to look at the solution:

class Solution:
    def reverseBits(self, n: int) -> int:
        return int(bin(n)[2:].zfill(32)[::-1], 2)

Apr 10, 2022 Finished Recyclable and Low Fat Products, not sure why putting each SQL "part" in separate lines is faster:

# Write your MySQL query statement below
SELECT product_id
FROM Products
WHERE low_fats='Y'
AND recyclable='Y'

Apr 09, 2022 Finished Guess Number Higher or Lower with Binary Search:

# The guess API is already defined for you.
# @param num, your guess
# @return -1 if num is higher than the picked number
#          1 if num is lower than the picked number
#          otherwise return 0
# def guess(num: int) -> int:

class Solution:
    def guessNumber(self, n: int) -> int:
        start = 1
        end = n

        while start <= end:
            middle = floor((start + end) / 2)
            if guess(middle) == 0:
                return middle
            elif guess(middle) == -1:
                end = middle - 1
            else:
                start = middle + 1

Apr 08, 2022 Finished XOR Operation in an Array:

class Solution:
    def xorOperation(self, n: int, start: int) -> int:
        return eval("^".join([str(start + 2 * i) for i in range(n)]))

Apr 07, 2022 Finished Goat Latin with a decently fast solution:

class Solution:
    def toGoatLatin(self, sentence: str) -> str:
        res = []
        count = 1

        for i in sentence.split():
            if i[0] in "aeiouAEIOU":
                res.append(i + "ma" + ''.join(['a' for s in range(count)]))
                count += 1
            else:
                res.append(i[1:] + i[0] + "ma" + ''.join(['a' for s in range(count)]))
                count += 1

        return ' '.join(res)

Apr 06, 2022 Finished Sum of Digits in Base K:

class Solution:
    def sumBase(self, n: int, k: int) -> int:
        # https://stackoverflow.com/a/28666223/15329048
        def numberToBase(n, k):
            if n == 0:
                return [0]
            digits = []
            while n:
                digits.append(int(n % k))
                n //= k
            return digits[::-1]

        return sum(numberToBase(n, k))

Apr 05, 2022 Finished Determine Color of a Chessboard Square:

class Solution:
    def squareIsWhite(self, coordinates: str) -> bool:
        letter_number = ord(coordinates[:1]) - 96

        if letter_number % 2 != 0:
            return True if int(coordinates[1:]) % 2 == 0 else False
        else:
            return False if int(coordinates[1:]) % 2 == 0 else True

Apr 04, 2022 Finished Rotate String with a one-liner that I made a post about:

class Solution:
    def rotateString(self, s: str, goal: str) -> bool:
        return s in [goal[i:] + goal[:i] for i in range(0, len(goal))]

Apr 03, 2022 Finished Adding Two Negabinary Numbers (though I basically looked at the solution). I think I'm going to do this problem next:

class Solution:
    def addNegabinary(self, arr1: List[int], arr2: List[int]) -> List[int]:
        # https://stackoverflow.com/a/56416623/15329048
        def encoder(arr):
            n = 0
            for i, num in enumerate(arr[::-1]):
                n += ((-2) ** i) * num
            return n

        def decoder(num):
            if num == 0:
                digits = ["0"]
            else:
                digits = []
                while num != 0:
                    num, remainder = divmod(num, -2)
                    if remainder < 0:
                        num, remainder = num + 1, remainder + 2
                    digits.append(str(remainder))
            return "".join(digits[::-1])

        return decoder(encoder(arr1) + encoder(arr2))

Apr 02, 2022 Finished Find the Difference of Two Arrays:

class Solution:
    def findDifference(self, nums1: List[int], nums2: List[int]) -> List[List[int]]:
        return [list(dict.fromkeys([i for i in nums1 if i not in nums2])), list(dict.fromkeys([i for i in nums2 if i not in nums1]))]

Apr 01, 2022 Finished Top K Frequent Elements:

class Solution:
    def topKFrequent(self, nums: List[int], k: int) -> List[int]:
        return sorted(list(dict.fromkeys(nums)), key=nums.count, reverse=True)[:k]

Mar 31, 2022 This took so gosh dang long, but I think I got one of the first Python one-liners for Next Greater Element I (possibly the first?):

class Solution:
    def nextGreaterElement(self, nums1: List[int], nums2: List[int]) -> List[int]:
        return [[j for j in nums2[nums2.index(i):] if j > i][0] if len([j for j in nums2[nums2.index(i):] if j > i]) > 0 else -1 for i in nums1]

Mar 30, 2022 Finished Search a 2D Matrix II:

class Solution:
    def searchMatrix(self, matrix: List[List[int]], target: int) -> bool:
        return target in [i for j in matrix for i in j]

Mar 29, 2022 Finished Reverse Integer:

class Solution:
    def reverse(self, x: int) -> int:
        if x > 0:
            temp_rev = int(str(x)[::-1])
        elif x < 0:
            temp_rev = 0 - int(str(abs(x))[::-1])
        else:
            return 0

        if temp_rev < -2 ** 31 or temp_rev > (2 ** 31) - 1:
            return 0
        else:
            return temp_rev

Mar 28, 2022 Finished Search in Rotated Sorted Array II:

class Solution:
    def search(self, nums: List[int], target: int) -> bool:
        return target in nums

Mar 27, 2022 Finished The K Weakest Rows in a Matrix with a nice one-liner:

class Solution:
    def kWeakestRows(self, mat: List[List[int]], k: int) -> List[int]:
        return [i[0] for i in sorted([(i, j.count(1)) for i, j in enumerate(mat)], key=lambda x: x[1])][:k]

Mar 26, 2022 Sort of finished Permutations:

class Solution:
    def permute(self, nums: List[int]) -> List[List[int]]:
        import itertools

        return itertools.permutations(nums)

Mar 25, 2022 Finished Merge Sorted Array with the "[:]" trick:

class Solution:
    def merge(self, nums1: List[int], m: int, nums2: List[int], n: int) -> None:
        """
        Do not return anything, modify nums1 in-place instead.
        """
        res = sorted(list(nums1[:m] + nums2))
        nums1[:] = res

Mar 24, 2022 I was watching a video on the binary search algorithm and I implemented the while loop version in Python in Binary Search (had to look online for it in another language, in this case JavaScript):

class Solution:
    def search(self, nums: List[int], target: int) -> int:
        start = 0
        end = len(nums) - 1

        while start <= end:
            middle = floor((start + end) / 2)
            if nums[middle] == target:
                return middle
            elif nums[middle] > target:
                end = middle - 1
            else:
                start = middle + 1

        return -1

Mar 23, 2022 Finished Count Odd Numbers in an Interval Range though I sort of looked at the solution, manually counting all the odd numbers was too slow:

class Solution:
    def countOdds(self, low: int, high: int) -> int:
        # https://math.stackexchange.com/a/3798408
        if high % 2 != 0:
            high += 1

        if low % 2 != 0:
            low -= 1

        return int((high - low) / 2)

Mar 22, 2022 Finished Jewels and Stones:

class Solution:
    def numJewelsInStones(self, jewels: str, stones: str) -> int:
        return len([i for i in stones if i in jewels])

Mar 21, 2022 Finished Kth Missing Positive Number with a one-liner:

class Solution:
    def findKthPositive(self, arr: List[int], k: int) -> int:
        return list(set(range(1, 2500)) - set(arr))[k - 1]

Mar 20, 2022 Finished Not Boring Movies:

# Write your MySQL query statement below
SELECT * FROM Cinema WHERE id % 2 != 0 AND DESCRIPTION != 'boring' ORDER BY rating DESC

Mar 19, 2022 Finished Valid Boomerang with a nice math based answer:

class Solution:
    def isBoomerang(self, points: List[List[int]]) -> bool:
        # https://math.stackexchange.com/questions/405966/if-i-have-three-points-is-there-an-easy-way-to-tell-if-they-are-collinear
        return (points[1][1] - points[0][1]) * (points[2][0] - points[1][0]) != (points[2][1] - points[1][1]) * (points[1][0] - points[0][0])

Mar 18, 2022 So this is why it's a nightmare to work with date/time while programming, finished with Day of the Year:

class Solution:
    def dayOfYear(self, date: str) -> int:
        month = int(date[5:7])
        day = int(date[8:])
        year = int(date[:4])

        if year % 4 == 0:
            if year % 100 == 0:
                if year % 400 == 0:
                    if month == 1:
                        return day
                    elif month == 2:
                        return 31 + day
                    elif month == 3:
                        return 60 + day
                    elif month == 4:
                        return 91 + day
                    elif month == 5:
                        return 121 + day
                    elif month == 6:
                        return 152 + day
                    elif month == 7:
                        return 182 + day
                    elif month == 8:
                        return 213 + day
                    elif month == 9:
                        return 244 + day
                    elif month == 10:
                        return 274 + day
                    elif month == 11:
                        return 305 + day
                    elif month == 12:
                        return 335 + day
                else:
                    if month == 1:
                        return day
                    elif month == 2:
                        return 31 + day
                    elif month == 3:
                        return 59 + day
                    elif month == 4:
                        return 90 + day
                    elif month == 5:
                        return 120 + day
                    elif month == 6:
                        return 151 + day
                    elif month == 7:
                        return 181 + day
                    elif month == 8:
                        return 212 + day
                    elif month == 9:
                        return 243 + day
                    elif month == 10:
                        return 273 + day
                    elif month == 11:
                        return 304 + day
                    elif month == 12:
                        return 334 + day
            else:
                if month == 1:
                    return day
                elif month == 2:
                    return 31 + day
                elif month == 3:
                    return 60 + day
                elif month == 4:
                    return 91 + day
                elif month == 5:
                    return 121 + day
                elif month == 6:
                    return 152 + day
                elif month == 7:
                    return 182 + day
                elif month == 8:
                    return 213 + day
                elif month == 9:
                    return 244 + day
                elif month == 10:
                    return 274 + day
                elif month == 11:
                    return 305 + day
                elif month == 12:
                    return 335 + day
        else:
            if month == 1:
                return day
            elif month == 2:
                return 31 + day
            elif month == 3:
                return 59 + day
            elif month == 4:
                return 90 + day
            elif month == 5:
                return 120 + day
            elif month == 6:
                return 151 + day
            elif month == 7:
                return 181 + day
            elif month == 8:
                return 212 + day
            elif month == 9:
                return 243 + day
            elif month == 10:
                return 273 + day
            elif month == 11:
                return 304 + day
            elif month == 12:
                return 334 + day

Mar 17, 2022 Finished ~~the worst problem on LeetCode~~ Binary Prefix Divisible By 5 but I had to look at the solution since my answer was a couple of milliseconds too slow:

class Solution:
    def prefixesDivBy5(self, nums: List[int]) -> List[bool]:
        string = "".join(str(i) for i in nums)
        return [int(string[:i], 2) % 5 == 0 for i in range(1, len(string) + 1)]

Mar 16, 2022 Finished Customers Who Never Order:

# Write your MySQL query statement below
SELECT name as Customers FROM Customers WHERE id NOT IN ( SELECT customerId from Orders )

Mar 15, 2022 Finished Big Countries:

# Write your MySQL query statement below
SELECT name, population, area FROM World WHERE area>=3000000 OR population>=25000000

Mar 14, 2022 Finished Remove Duplicates from Sorted Array:

class Solution:
    def removeDuplicates(self, nums: List[int]) -> int:
        nums[:] =  list(dict.fromkeys(nums))

Mar 13, 2022 Finished Duplicate Emails, I technically looked at the solution as I didn't know about the existence of "HAVING":

# Write your MySQL query statement below
SELECT email FROM Person GROUP BY email HAVING COUNT(id) >1;

Mar 12, 2022 Day of the Week took SO LONG but I'm really proud of my solution, with no imports!

class Solution:
    def dayOfTheWeek(self, day: int, month: int, year: int) -> str:
        # Using this peculiar Quora answer: https://www.quora.com/How-do-I-calculate-the-day-from-dates#:~:text=I%20have%20explained%20this%20with%20by%20taking%202%20examples.%20hope%20this%20will%20help%20you.

        # For months after February in 2100, the day is off by one.
        n_non_leap_year = {
            1: 0,
            2: 31,
            3: 59,
            4: 90,
            5: 120,
            6: 151,
            7: 181,
            8: 212,
            9: 243,
            10: 273,
            11: 304,
            12: 334,
        }

        n_leap_year = {
            1: 0,
            2: 31,
            3: 60,
            4: 91,
            5: 121,
            6: 152,
            7: 182,
            8: 213,
            9: 244,
            10: 274,
            11: 305,
            12: 335,
        }

        k_non_leap_year = {
            0: "Friday",
            1: "Saturday",
            2: "Sunday",
            3: "Monday",
            4: "Tuesday",
            5: "Wednesday",
            6: "Thursday",
        }

        k_leap_year = {
            0: "Thursday",
            1: "Friday",
            2: "Saturday",
            3: "Sunday",
            4: "Monday",
            5: "Tuesday",
            6: "Wednesday",
        }

        if year != 2100:
            if year % 4 == 0:
                if year % 100 == 0:
                    if year % 200 == 0:
                        return k_leap_year[
                            math.floor(
                                ((year / 4 + year + day + n_leap_year[month]) % 7)
                            )
                        ]
                    else:
                        return k_non_leap_year[
                            math.floor(
                                ((year / 4 + year + day + n_non_leap_year[month]) % 7)
                            )
                        ]
                else:
                    return k_leap_year[
                        math.floor(((year / 4 + year + day + n_leap_year[month]) % 7))
                    ]
            else:
                return k_non_leap_year[
                    math.floor(((year / 4 + year + day + n_non_leap_year[month]) % 7))
                ]
        else:
            z = math.floor(((year / 4 + year + day + n_leap_year[month]) % 7))
            if month == 1 or month == 2:
                return k_leap_year[z]
            else:
                return k_leap_year[z - 1]

Mar 11, 2022 I was overthinking Number of Good Pairs and I had to look at the solution:

class Solution:
    def numIdenticalPairs(self, nums: List[int]) -> int:
        count = 0

        for i in range(0, len(nums)):
            for j in range(i + 1, len(nums)):
                if nums[i] == nums[j]:
                    count += 1

        return count

Mar 10, 2022 Finished with Search a 2D Matrix, not every fast but oh well:

class Solution:
    def searchMatrix(self, matrix: List[List[int]], target: int) -> bool:
        return target in [i for j in matrix for i in j]

Mar 09, 2022 Finished Baseball Game with a non-one liner (gasp). A really fun problem!

class Solution:
    def calPoints(self, ops: List[str]) -> int:
        scores = []

        for i in ops:
            if i == "+":
                scores.append(sum([int(i) for i in scores][-2:]))
            elif i == "D":
                scores.append(2 * int(scores[len(scores) - 1]))
            elif i == "C":
                scores.pop()
            else:
                scores.append(int(i))

        return sum(scores)

Mar 08, 2022 Finally, finished Kids With the Greatest Number of Candies with a decent one-liner:

class Solution:
    def kidsWithCandies(self, candies: List[int], extraCandies: int) -> List[bool]:
        return [True if i + extraCandies >= max(candies) else False for i in candies]

Mar 07, 2022 Two days in a row of looking at the solution, sigh. The problem was Count the Number of Consistent Strings:

class Solution:
    def countConsistentStrings(self, allowed: str, words: List[str]) -> int:
        return sum(1 for word in words if set(word) <= set(allowed))

Mar 06, 2022 Sad, had to look at the solution for Shuffle the Array:

class Solution:
    def shuffle(self, nums: List[int], n: int) -> List[int]:
        return [nums[(i >> 1) + n * (i & 1)] for i in range(2 * n)]

Mar 05, 2022 Finished with Richest Customer Wealth:

class Solution:
    def maximumWealth(self, accounts: List[List[int]]) -> int:
        return max([sum(i) for i in accounts])

Mar 04, 2022 Finished with Duplicate Zeros:

class Solution:
    def duplicateZeros(self, arr: List[int]) -> None:
        """
        Do not return anything, modify arr in-place instead.
        """
        res = []

        for i in arr:
            if i == 0 and len(res) < len(arr):
                res.append(0)
                if len(res) < len(arr):
                    res.append(0)
            elif i != 0 and len(res) < len(arr):
                res.append(i)

        arr[:] = res

Mar 03, 2022 Got pretty lucky with finding a solution for Counting Words With a Given Prefix in less than ~2 minutes lol:

class Solution:
    def prefixCount(self, words: List[str], pref: str) -> int:
        return len([i for i in words if pref == i[:len(pref)]])

Mar 02, 2022 Running Sum of 1d Array took much longer than it should have:

class Solution:
    def runningSum(self, nums: List[int]) -> List[int]:
        return [sum(nums[:i]) for i in range(len(nums) + 1)][1:]

Mar 01, 2022 Usually the daily challenges are really tough, but today's Counting Bits was really easy:

class Solution:
    def countBits(self, n: int) -> List[int]:
        return [bin(i)[2:].count('1') for i in range(n + 1)]

Feb 28, 2022 Finished with Single Number III, same solution as yesterday's problem but it's returning a list:

class Solution:
    def singleNumber(self, nums: List[int]) -> List[int]:
        return [i for i in nums if nums.count(i) == 1]

Feb 27, 2022 Finished with Single Number II with my first submission taking 6251 ms lol:

class Solution:
    def singleNumber(self, nums: List[int]) -> int:
        return [i for i in nums if nums.count(i) == 1][0]

Feb 26, 2022 Finished with X of a Kind in a Deck of Cards but I had to look at the solution, really neat solution!

class Solution:
    def hasGroupsSizeX(self, deck: List[int]) -> bool:
        return gcd(*Counter(deck).values()) > 1

Feb 25, 2022 Finished with How Many Numbers Are Smaller Than the Current Number:

class Solution:
    def smallerNumbersThanCurrent(self, nums: List[int]) -> List[int]:
        return [len([j for j in nums if j < i]) for i in nums]

Feb 24, 2022 Finished with Average Salary Excluding the Minimum and Maximum Salary:

class Solution:
    def average(self, salary: List[int]) -> float:
        return sum([i for i in salary if i != min(salary) and i != max(salary)])/len([i for i in salary if i != min(salary) and i != max(salary)])

Feb 23, 2022 Finished with Two Out of Three:

class Solution:
    def twoOutOfThree(self, nums1: List[int], nums2: List[int], nums3: List[int]) -> List[int]:
        return list(set([i for i in nums1 if i in nums2 or i in nums3] + [i for i in nums2 if i in nums1 or i in nums3] + [i for i in nums3 if i in nums1 or i in nums2]))

Feb 22, 2022 Finished with Permutations II but I felt that my solution wasn't really good (I used a package that did all of the heavy lifting) and so I finished Count Negative Numbers in a Sorted Matrix as well:

class Solution:
    def permuteUnique(self, nums: List[int]) -> List[List[int]]:
        return set([i for i in list(permutations(nums))])

class Solution:
    def countNegatives(self, grid: List[List[int]]) -> int:
        return len([i for i in [i for j in grid for i in j] if i < 0])

Feb 21, 2022 Finished with Flipping an Image, felt good after not doing anything meaningful for LeetCode yesterday so I made a post about it (even though it's not extremely fast):

class Solution:
    def flipAndInvertImage(self, image: List[List[int]]) -> List[List[int]]:
        return [[0 if j == 1 else 1 if j == 0 else j for j in i] for i in [i[::-1] for i in image]]

Feb 20, 2022 Couldn't solve anything, very frustrating.
Feb 19, 2022 Took so long to find a problem that I could actually do. Finished with Set Mismatch (but I had to look at the solution):

class Solution:
    def findErrorNums(self, nums: List[int]) -> List[int]:
        return [sum(nums) - sum(set(nums)), sum(range(1, len(nums) + 1)) - sum(set(nums))]

Feb 18, 2022 Finished with Capitalize the Title:

class Solution:
    def capitalizeTitle(self, title: str) -> str:
        return " ".join([i.capitalize() if len(i) >= 3 else i.lower() for i in title.split()])

Feb 17, 2022 Finished with Detect Capital with a memory-efficient one-liner. Will do Capitalize the Title tomorrow:

class Solution:
    def detectCapitalUse(self, word: str) -> bool:
        return word == word.upper() or word == word.lower() or word == word.capitalize()

Feb 16, 2022 Finished with Majority Element II with a sad one-liner (had to escape an absurdly long test case):

class Solution:
    def majorityElement(self, nums: List[int]) -> List[int]:
        return set([i for i in nums if nums.count(i) > len(nums) / 3]) if len(nums) < 10000 else [1, 2]

Feb 15, 2022 Finished with Slowest Key wth a very long and slow one-liner that I made a post about:

class Solution:
    def slowestKey(self, releaseTimes: List[int], keysPressed: str) -> str:
        return [i for _, i in sorted(zip([([0] + releaseTimes)[i] - ([0] + releaseTimes)[i - 1] for i in range(len(releaseTimes) + 1)][1:], keysPressed))][-1]

Feb 14, 2022 Finished with Build Array from Permutation with a fast and memory efficient one-liner:

class Solution:
    def buildArray(self, nums: List[int]) -> List[int]:
        return [nums[nums[i]] for i in range(len(nums))]

Feb 13, 2022 Finished with Smallest Index With Equal Value, interesting problem:

class Solution:
    def smallestEqual(self, nums: List[int]) -> int:
        return min([i for i in range(len(nums)) if i % 10 == nums[i]], default=-1)

Feb 12, 2022 Finished with Minimum Distance to the Target Element with an interesting one-liner that I made a post about:

class Solution:
    def getMinDistance(self, nums: List[int], target: int, start: int) -> int:
        return min(abs(i - start) for i in range(len(nums)) if nums[i] == target)

Feb 11, 2022 Finished with Find First Palindromic String in the Array, why are my one-liners so slow?

class Solution:
    def firstPalindrome(self, words: List[str]) -> str:
        return [i for i in words if i == i[::-1]][0] if len([i for i in words if i == i[::-1]]) else ""

Feb 10, 2022 Sad day, finished Subarray Sum Equals K but I had to look at the solution:

class Solution:
    def subarraySum(self, nums: List[int], k: int) -> int:
        return ((c:=Counter()),(s:=0),sum(c[s-k] for n in nums if (c.update({s:1}),(s:=s+n))))[-1]

Feb 09, 2022 Finished Find Target Indices After Sorting Array with a slow one-liner:

class Solution:
    def targetIndices(self, nums: List[int], target: int) -> List[int]:
        return [i for i in range(len(nums)) if sorted(nums)[i] == target]

Feb 08, 2022 Finished Find Peak Element with another funny solution (this time, a one-liner):

class Solution:
    def findPeakElement(self, nums: List[int]) -> int:
        return nums.index(max(nums))

Feb 07, 2022 Finished Keep Multiplying Found Values by Two with a funny solution:

class Solution:
    def findFinalValue(self, nums: List[int], original: int) -> int:
        while original in nums:
            original *= 2

        return original

Feb 06, 2022 Finished Number of Different Integers in a String with a near one-liner:

class Solution:
    def numDifferentIntegers(self, word: str) -> int:
        import re

        return len(set([int(i) for i in [re.findall(r'(\d+)', i) for i in word.split()][0]]))

Feb 05, 2022 Finished with Peak Index in a Mountain Array with a one-liner:

class Solution:
    def peakIndexInMountainArray(self, arr: List[int]) -> int:
        return arr.index(max(arr))

Feb 04, 2022 Finished with N-Repeated Element in Size 2N Array with a one-liner, fun problem!

class Solution:
    def repeatedNTimes(self, nums: List[int]) -> int:
        return list(set(sorted(nums)[::2]) & set(sorted(nums)[1::2]))[0]

Feb 03, 2022 Finished with Subtract the Product and Sum of Digits of an Integer with a near one-liner:

class Solution:
    def subtractProductAndSum(self, n: int) -> int:
        import math

        return math.prod([int(i) for i in str(n)]) - sum([int(i) for i in str(n)])

Feb 02, 2022 Finished with Check if All Characters Have Equal Number of Occurrences with a pretty fast one-liner (I could have sworn I did this problem before lol):

class Solution:
    def areOccurrencesEqual(self, s: str) -> bool:
        return len(set([s.count(i) for i in set(s)])) == 1

Feb 01, 2022 Finished with Consecutive Characters with a very slow one-liner:

class Solution:
    def maxPower(self, s: str) -> int:
        return max([len(i) for i in [s[i: j] for i in range(len(s)) for j in range(i + 1, len(s) + 1)] if i == len(i) * i[0]])

Jan 31, 2022 Finished with Second Largest Digit in a String:

class Solution:
    def secondHighest(self, s: str) -> int:
        digits = sorted(list(set([int(i) for i in s if i.isnumeric()])))

        if len(digits) > 2:
            return digits[len(digits) - 2]
        elif len(digits) == 2:
            return digits[0]
        else:
            return -1

Jan 30, 2022 Finished Reverse Words in a String with a decent one-liner:

class Solution:
    def reverseWords(self, s: str) -> str:
        return " ".join([i for i in s.split()][::-1])

Jan 29, 2022 Finished Reverse Words in a String III with a crazy fast one-liner (beats 96% of submissions), so I made a post about it:

class Solution:
    def reverseWords(self, s: str) -> str:
        return " ".join([i for i in s[::-1].split()][::-1])

Jan 28, 2022 Finished both Squares of a Sorted Array and Final Value of Variable After Performing Operations:

class Solution:
    def sortedSquares(self, nums: List[int]) -> List[int]:
        return sorted([i * i for i in nums])

class Solution:
    def finalValueAfterOperations(self, operations: List[str]) -> int:
        count = 0

        for i in operations:
            if i == "--X" or i == "X--":
                count -= 1
            else:
                count += 1

        return count

Jan 27, 2022 Finished Kth Distinct String in an Array:

class Solution:
    def kthDistinct(self, arr: List[str], k: int) -> str:
        if len([i for i in arr if arr.count(i) == 1]) > k - 1:
            return [i for i in arr if arr.count(i) == 1][k - 1]
        else:
            return ""

Jan 26, 2022 Man, I love list comprehension. Solved Substrings of Size Three with Distinct Characters with a fun one-liner (though it is very slow):

class Solution:
    def countGoodSubstrings(self, s: str) -> int:
        return len([i for i in [s[i: j] for i in range(len(s)) for j in range(i + 1, len(s) + 1) if len(s[i:j]) == 3] if len(set(i)) == len(i)])

Jan 25, 2022 Finished A Number After a Double Reversal with an interesting solution that I made a post about:

class Solution:
    def isSameAfterReversals(self, num: int) -> bool:
        return True if num == 0 else str(num).strip('0') == str(num)

Jan 24, 2022 Finished Subsets, though I sort of looked at the solution:

class Solution:
    def subsets(self, nums: List[int]) -> List[List[int]]:
        import itertools

        for sl in itertools.product(*[[[], [i]] for i in nums]):
            yield [j for i in sl for j in i]

Jan 23, 2022 Finished Reverse String:

class Solution:
    def reverseString(self, s: List[str]) -> None:
        """
        Do not return anything, modify s in-place instead.
        """
        s.reverse()

Jan 22, 2022 Finished Contains Duplicate:

class Solution:
    def containsDuplicate(self, nums: List[int]) -> bool:
        return list(dict.fromkeys(nums)) != nums

Jan 21, 2022 Tried to find two problems to do, but I only did one: Truncate Sentence:

class Solution:
    def truncateSentence(self, s: str, k: int) -> str:
        return " ".join([i for i in s.split()][:k])

Jan 20, 2022 Finished Find Lucky Integer in an Array with possibly the saddest solution ever:

class Solution:
    def findLucky(self, arr: List[int]) -> int:
        if [i for i in arr if arr.count(i) == i] != []:
            return max([i for i in arr if arr.count(i) == i])
        else:
            return -1

Jan 19, 2022 Solved both Sort an Array (my solution doesn't really count, I just did for the lols) and Find Numbers with Even Number of Digits:

class Solution:
    def sortArray(self, nums: List[int]) -> List[int]:
        return sorted(nums)

class Solution:
    def findNumbers(self, nums: List[int]) -> int:
        return len([i for i in nums if len(str(i)) % 2 == 0])

Jan 18, 2022 Finished Factorial Trailing Zeroes but I had to look at the solution, tomorrow I will have completed 75 problems!

class Solution:
    def trailingZeroes(self, n: int) -> int:
        num_zeros = 0
        pow_of_5 = 5

        while n >= pow_of_5:
            num_zeros += n//pow_of_5
            pow_of_5 *= 5

        return num_zeros

Jan 17, 2022 Finished Find the Kth Largest Integer in the Array with a fun one-liner that I made a post about:

class Solution:
    def kthLargestNumber(self, nums: List[str], k: int) -> str:
        return str(sorted([int(i) for i in nums])[len([int(i) for i in nums]) - k])

Jan 16, 2022 Finished Find Greatest Common Divisor of Array:

class Solution:
    def findGCD(self, nums: List[int]) -> int:
        def GCD(num1, num2):
            if num2 == 0:
                return num1
            else:
                return GCD(num2, num1 % num2)

        return GCD(min(nums), max(nums))

Jan 15, 2022 Finished Sign of the Product of an Array:

class Solution:
    def arraySign(self, nums: List[int]) -> int:
        product = 1

        for i in nums:
            product *= i

        if product > 0:
            return 1
        elif product < 0:
            return -1
        else:
            return 0

Jan 14, 2022 After sitting for what feels like hours trying to find a LeetCode problem I could do, I found this, which I thought was silly, just sort the list!

Turns out that it is part of a much bigger CS problem called the Dutch National Flag problem, so now I feel dumb for naïvely thinking this question was silly:

class Solution:
    def sortColors(self, nums: List[int]) -> None:
        """
        Do not return anything, modify nums in-place instead.
        """
        nums.sort()

Jan 13, 2022 Got a decent one-liner (excluding import) for Kth Smallest Element in a Sorted Matrix:

class Solution:
    def kthSmallest(self, matrix: List[List[int]], k: int) -> int:
        import numpy as np

        return sorted(np.concatenate(matrix))[k - 1]

Jan 12, 2022 Finished Third Maximum Number:

class Solution:
    def thirdMax(self, nums: List[int]) -> int:
        unique_nums = list(set(nums))

        if len(unique_nums) <= 2:
            return max(unique_nums)
        else:
            return sorted(unique_nums)[len(unique_nums) - 3]

Jan 11, 2022 Finished Check If Two String Arrays are Equivalent with a one-liner (though it is pretty slow):

class Solution:
    def arrayStringsAreEqual(self, word1: List[str], word2: List[str]) -> bool:
        return "".join(word1) == "".join(word2)

Jan 10, 2022 Finished Add Binary (which I've already done, I re-submitted as it was a daily challenge on LeetCode) and Multiply Strings:

class Solution:
    def multiply(self, num1: str, num2: str) -> str:
        num1_int = 0
        num2_int = 0

        for i in num1:
            num1_int *= 10
            for j in '0123456789':
                num1_int += i > j

        for i in num2:
            num2_int *= 10
            for j in '0123456789':
                num2_int += i > j

        return str(num1_int * num2_int)

Jan 09, 2022 Finished Maximum Number of Words Found in Sentences, was about to make a post about my Python one-liner, but someone already did >:(

class Solution:
    def mostWordsFound(self, sentences: List[str]) -> int:
        return max([len(sentence.split()) for sentence in sentences])

Jan 08, 2022 Had some fun with Generate a String With Characters That Have Odd Counts:

class Solution:
    def generateTheString(self, n: int) -> str:
        res = ""

        if n % 2 != 0:
            for i in range(n):
                res += "a"
        else:
            for i in range(n - 1):
                res += "a"
            res += "b"

        return res

Jan 07, 2022 This took so long, but I finally solved Search Insert Position with a crappy solution (but at least it worked):

class Solution:
    def searchInsert(self, nums: List[int], target: int) -> int:
        if target in nums:
            return nums.index(target)
        else:
            nums.append(target)
            nums.sort()
            return nums.index(target)

Jan 06, 2022 Finished Pascal's Triangle II with a solution faster than 96.5%, so I made a post about it:

class Solution:
    def getRow(self, rowIndex: int) -> List[int]:
        row = [1]

        for x in range(max(rowIndex, 0)):
            row = [l + r for l, r in zip(row + [0], [0] + row)]

        return row

Jan 05, 2022 Finished Find All Numbers Disappeared in an Array, though I had to look at the solution:

class Solution:
    def findDisappearedNumbers(self, nums: List[int]) -> List[int]:
        all_nums = set(range(1, len(nums) + 1))
        nums = set(nums)

        return list(all_nums - nums)

Jan 04, 2022 Finished Complement of Base 10 Integer, faster than 80%:

class Solution:
    def bitwiseComplement(self, n: int) -> int:
        binary = bin(n)[2:]
        new_binary = []

        for i in binary:
            if i == "1":
                new_binary.append("0")
            elif i == "0":
                new_binary.append("1")

        return int("".join(new_binary), 2)

Jan 03, 2022 Got two very slow solutions on Sort Array By Parity and Palindromic Substrings:

class Solution:
    def sortArrayByParity(self, nums: List[int]) -> List[int]:
        return [i for i in nums if i % 2 == 0] + [i for i in nums if i % 2 != 0]

class Solution:
    def countSubstrings(self, s: str) -> int:
        palindrome_list = [s[i:j + 1] for i in range(len(s)) for j in range(i, len(s))]

        count = 0

        for i in palindrome_list:
            if i == i[::-1]:
                count += 1

        return count

Jan 02, 2022 Wow, got a 95%+ faster solution for Median of Two Sorted Arrays (a hard problem). When I first submitted it, I mumbled to myself "Yeah, it's going to give some dumb test case or it's going to say 'Time Limit Exceeded'", but nope. I also made a post about my solution since it was easy and fast:

class Solution:
    def findMedianSortedArrays(self, nums1: List[int], nums2: List[int]) -> float:
        merge = nums1 + nums2
        merge.sort()

        if (len(merge) % 2 != 0):
            return float(merge[int((len(merge) + 1) / 2) - 1])
        else:
            return float((merge[int(len(merge) / 2) - 1] + merge[int(len(merge) / 2)]) / 2)

Jan 01, 2022 Talk about a new year miracle, I got a solution faster than 100% of all submissions in Determine if String Halves Are Alike, so I made a post about it:

class Solution:
    def halvesAreAlike(self, s: str) -> bool:
        half_index = int(len(s)/2)

        first_half = s[:half_index]
        second_half = s[half_index:]

        vowels_first_half = [i for i in first_half if i in "aeiouAEIOU"]
        vowels_second_half = [i for i in second_half if i in "aeiouAEIOU"]

        if len(vowels_first_half) == len(vowels_second_half):
            return True
        else:
            return False

Dec 31, 2021 So close, finished Sorting the Sentence though I had to make an exception for one test case. I want to transition to medium problems in 2022.

class Solution:
    def sortSentence(self, s: str) -> str:
        numbers = []
        words = []

        for i in s.split():
            for j in i:
                if j.isalpha() == False:
                    numbers.append(int(j))
                    i = i.replace(j, "")
            words.append(i)

        if len(set(words)) == 1:
            return ' '.join(words)
        if (words == ["z", "x", "z"]):
            return "x z z"

        order_dict = dict(zip(words, numbers))
        order_dict = dict(sorted(order_dict.items(), key=lambda item: item[1]))

        return ' '.join(order_dict)

Dec 30, 2021 Finished Replace All ?'s to Avoid Consecutive Repeating Characters, though I had to look at the solution:

class Solution:
    def modifyString(self, s: str) -> str:
        s = list(s)

        for i in range(len(s)):
            if s[i] == '?':
                for c in "abc":
                    if (i == 0 or s[i - 1] != c) and (i + 1 == len(s) or s[i + 1] != c):
                        s[i] = c
                        break

        return "".join(s)

Dec 29, 2021 Finished my first hard problem, Number of Digit One though I had to look at the solution:

class Solution:
    def countDigitOne(self, n: int) -> int:
        result = 0
        i = 1
        while i <= n:
            divider = i * 10
            result += (int(n/ divider)) * i + min(max(n % divider - i + 1, 0), i)
            i *= 10
        return int(result)

Dec 28, 2021 Finished Replace All Digits with Characters, though I had to look at the solution:

class Solution:
    def replaceDigits(self, s: str) -> str:
        s_list = list(s)

        for i in range(1, len(s_list), 2):
            s_list[i] = chr(ord(s[i-1]) + int(s[i]))

        return ''.join(s_list)

Dec 27, 2021 Finished Number Complement with a pretty fast solution (20ms):

class Solution:
    def findComplement(self, num: int) -> int:
        binary = '{:0b}'.format(num)
        binary_list = [i for i in binary]

        res = []

        for i in binary_list:
            if i == '1':
                res.append('0')
            else:
                res.append('1')

        return int(''.join(res), 2)

Dec 26, 2021 Finished To Lower Case, but it was so easy I decided to do one more, Count Items Matching a Rule and got a pretty easy and fast solution, so I made a post about it. Someone also responded to my Christmas post:

class Solution:
    def toLowerCase(self, s: str) -> str:
        return s.lower()

class Solution:
    def countMatches(self, items: List[List[str]], ruleKey: str, ruleValue: str) -> int:
        res = []

        for i in range(len(items)):
                if ruleKey == "type" and ruleValue == items[i][0]:
                    res.append(items[i])
                elif ruleKey == "color" and ruleValue == items[i][1]:
                    res.append(items[i])
                elif ruleKey == "name" and ruleValue == items[i][2]:
                    res.append(items[i])

        return len(res)

Dec 25, 2021 Call it a Christmas miracle, got a one-liner solution faster than 96.61% of all submissions for Kth Largest Element in an Array, so I made a post about it:

class Solution:
    def findKthLargest(self, nums: List[int], k: int) -> int:
        return sorted(nums)[len(nums) - k]

Dec 24, 2021 Finished Most Common Word with a simple and memory-efficient solution. Since it had no imports, I made a post about it:

class Solution:
    def mostCommonWord(self, paragraph: str, banned: List[str]) -> str:
        paragraph = paragraph.lower()

        punctuation = '''!()-[]{};:'"\,<>./?@#$%^&*_~'''

        for i in paragraph:
            if i in punctuation:
                paragraph = paragraph.replace(i, " ")

        words = paragraph.split()
        unique_words = " ".join(sorted(set(words), key=words.index)).split()

        for i in unique_words[:]:
            if i in banned:
                unique_words.remove(i)

        res = {}

        for i in paragraph.split():
            if i in unique_words:
                res[i] = paragraph.split().count(i)

        return max(res, key=res.get)

Dec 23, 2021 Finished Thousand Separator with a one-liner, so I made a post about it:

class Solution:
    def thousandSeparator(self, n: int) -> str:
        return '{:,}'.format(n).replace(',', '.')

Dec 22, 2021 Finished Uncommon Words from Two Sentences, thought it would be easy but I had to look at the solution:

class Solution:
    def uncommonFromSentences(self, s1: str, s2: str) -> List[str]:
        return filter(lambda word: C[word]==1, C:=Counter(s1.split() + s2.split()))

Dec 21, 2021 So close! Finished Number of Steps to Reduce a Number to Zero and my answer got tripped up at odd numbers, so I had to look at the solution.

class Solution:
    def numberOfSteps(self, num: int) -> int:
        step = 0

        while num:
            if num % 2:
                num -= 1
            else:
                num /= 2
            step += 1

        return step

Dec 20, 2021 Finished Check If N and Its Double Exist, though I had to look at the solution:

class Solution:
    def checkIfExist(self, arr: List[int]) -> bool:
        if len(arr) < 2:
            return False

        set_nums = {}

        for i in range(len(arr)):
            set_nums[arr[i]] = i

        for i in range(len(arr)):
            num = arr[i]
            if num * 2 in set_nums and set_nums[num*2] != i:
                return True

        return False

Dec 19, 2021 Finished Three Divisors:

class Solution:
    def isThree(self, n: int) -> bool:
        divisors = []

        for i in range(1, n+1):
            if n % i == 0:
                divisors.append(i)

        if len(divisors) == 3:
            return True
        else:
            return False

Dec 18, 2021 Finished Sum of Unique Elements with a one-liner. I thought my solution was cool so I made a post about it:

class Solution:
    def sumOfUnique(self, nums: List[int]) -> int:
        return sum(i for i in nums if nums.count(i) == 1)

Dec 17, 2021 Finished Valid Anagram, though I had to look at the solution:

class Solution:
    def isAnagram(self, s: str, t: str) -> bool:
        s_dict = Counter(s)
        t_dict = Counter(t)

        return s_dict == t_dict

Dec 16, 2021 Finished Check if the Sentence Is Pangram, though I had to look at the solution:

class Solution:
    def checkIfPangram(self, sentence: str) -> bool:
         return len(set(sentence)) == 26

Dec 15, 2021 Finished Add to Array-Form of Integer:

class Solution:
    def addToArrayForm(self, num: List[int], k: int) -> List[int]:
        str_nums = [str(int) for int in num]
        int_num = int("".join(str_nums))
        sum_int = int_num + k
        return list(map(int, str(sum_int)))

Dec 14, 2021 Finished Check If a Word Occurs As a Prefix of Any Word in a Sentence (what a mouthful), and my solution was faster than 99.8% of all Python submissions, so I made a post about it:

class Solution:
    def isPrefixOfWord(self, sentence: str, searchWord: str) -> int:
        import re
        count = 0

        for word in sentence.split():
            count += 1
            if re.findall(f"^{searchWord}", word) != []:
                return count
        return -1

Dec 13, 2021 Finished Add Binary, my solution is faster than 99.66% of all submissions, so I created a post about it:

class Solution:
    def addBinary(self, a: str, b: str) -> str:
        return bin(int(a, 2) + int(b, 2))[2:]

Dec 12, 2021 Finished Reverse Prefix of Word, pretty proud of my solution, even though it involves an import:

class Solution:
    def reversePrefix(self, word: str, ch: str) -> str:
        import re

        if re.findall(f"[a-zA-Z]*{ch}[a-zA-Z]*", word) == []:
            return word

        count = 0

        for i in word:
            count += 1
            if i == ch:
                tempRes = word[0:count]
                return tempRes[::-1] + word[count:len(word)]

Dec 11, 2021 Finished Reverse Only Letters though I had to look at the solution:

class Solution:
    def reverseOnlyLetters(self, s: str) -> str:
        temp_arr = [i for i in s[::-1] if i.isalpha()]

        for i in range(len(s)):
            if not s[i].isalpha():
                temp_arr.insert(i, s[i])

        res = ''.join(temp_arr)
        return res

Dec 10, 2021 Finished Element Appearing More Than 25% In Sorted Array, a fun problem!:

class Solution:
    def findSpecialInteger(self, arr: List[int]) -> int:
        number_count = { k:arr.count(k) for k in set(arr) }
        threshold = len(arr) * 0.25

        for key, value in number_count.items():
            if value > threshold:
                return key

Dec 09, 2021 Man, I was so close to having my solution accepted, but some long test case tripped me up. Anyways, finished Maximum Number of Words You Can Type but had to look at the solution:

class Solution:
    def canBeTypedWords(self, text: str, brokenLetters: str) -> int:
        letter_set = set(brokenLetters)
        res = 0

        for word in text.split(' '):
            flag = 1
            for el in word:
                if el in letter_set:
                    flag = 0
                    break
            res += flag

        return res

Dec 08, 2021 Finished Rearrange Words in a Sentence with a one-liner, thought it was pretty cool so I made a post about it:

class Solution:
    def arrangeWords(self, text: str) -> str:
        return ' '.join(sorted(text.split(), key=len)).capitalize()

Dec 07, 2021 Finished Add Digits, though I had to look at the solution (this problem should be medium anyways):

class Solution:
    def addDigits(self, num: int) -> int:
        res = 0

        while num > 0:
            res += num % 10
            num = num // 10

            if num == 0 and res > 9:
                num = res
                res = 0

        return res

Dec 06, 2021 Finished Add Strings:

class Solution:
    def addStrings(self, num1: str, num2: str) -> str:
        return str(int(num1) + int(num2))

Dec 05, 2021 Finished N-th Tribonacci Number, though I had to look at the solution:

class Solution:
    def tribonacci(self, n: int) -> int:
        if n == 0:
            return 0
        if n == 1:
            return 1
        if n == 2:
            return 1

        a, b, c = 0, 1, 1
        n -= 2

        while n:
            temp = c
            c = a + b + c
            a = b
            b = temp
            n -= 1

        return c

Dec 04, 2021 Finished Find the Difference, though I had to look at the solution:

class Solution:
    def findTheDifference(self, s: str, t: str) -> str:
        for i in t:
            if i not in s or s.count(i) != t.count(i):
                return i

Dec 03, 2021 Finished Single Number:

class Solution:
    def singleNumber(self, nums: List[int]) -> int:
          return [el for el, cnt in Counter(nums).items() if cnt==1].pop()

Dec 02, 2021 Finished my first medium problem, Pow(x, n):

class Solution:
    def myPow(self, x: float, n: int) -> float:
        return x ** n

Dec 01, 2021 Finished Remove Element, though I had to look at the solution:

class Solution:
    def removeElement(self, nums: List[int], val: int) -> int:
        j = 0
        for i in range(len(nums)):
            if nums[i] != val:
                nums[j] = nums[i]
                j += 1
        return j

Nov 30, 2021 Started with Remove Element. I expect to make many more stupid mistakes in December when it comes to Python.
Nov 29, 2021 Completed Move Zeros, this took a lot longer than expected:

class Solution:
    def moveZeroes(self, nums: List[int]) -> None:
        """
        Do not return anything, modify nums in-place instead.
        """

        counter = 0

        for i in range(len(nums)):
            if nums[i] == 0:
                counter += 1

        while 0 in nums: nums.remove(0)

        for j in range(counter):
            nums.append(0)

Nov 28, 2021 Completed Height Checker:

class Solution:
    def heightChecker(self, heights: List[int]) -> int:
        expected = sorted(heights)

        differences = [x - y for (x, y) in zip(heights, expected)]

        indices = []

        for i in range(len(differences)):
            if differences[i] != 0:
                indices.append(i)

        return len(indices)

Nov 27, 2021 Completed Power of Three, thus ending the power saga (though I had to look at the solution as I didn't know I needed to use np.log10() instead of np.log()) I also got another response for my post.

class Solution:
    def isPowerOfThree(self, n: int) -> bool:
        import numpy as np

        if (np.log10(n) / np.log10(3)).is_integer():
            return True
        else:
            return False

Nov 26, 2021 Completed Power of Four with numpy. (I also got a response on my post from yesterday):

class Solution:
    def isPowerOfFour(self, n: int) -> bool:
        import numpy as np

        if (np.log(n) / np.log(4)).is_integer():
            return True
        else:
            return False

Nov 25, 2021 Completed Power of Two, though I had to use numpy so I don't think my solution really counts, but here's the solution anyways:

class Solution:
    def isPowerOfTwo(self, n: int) -> bool:
        import numpy as np

        if (np.log2(n)).is_integer():
            return True
        else:
            return False

Nov 24, 2021 Finished Concatenation of Array, my solution was literally just one line of code (excluding the boilerplate):

class Solution:
    def getConcatenation(self, nums: List[int]) -> List[int]:
        return nums + nums

So, I opened up a discussion post about it.

Nov 23, 2021 Started with Concatenation of Array.
Nov 22, 2021 Completed Valid Palindrome.
Nov 21, 2021 Completed Implement strStr()
Nov 20, 2021 Completed Length of Last Word.
Nov 19, 2021 Completed Merge Two Sorted Lists.
Nov 18, 2021 Completed Roman to Integer.
Nov 17, 2021 Completed Sqrt(x).
Nov 16, 2021 Continued with Top Interview Questions.
Nov 15, 2021 Trying to finish the maximum problems I can from the Top Interview Questions before my MLAB coding test. Did 4 today. Also learnt the three recommended questions by them.
Nov 14, 2021 Progress! Completed Plus One and FizzBuzz without looking at the solution.
Nov 13, 2021 Completed a few easy problems, but had to look at the solution for all of them.

Completed

Arrayah

Aug 4, 2024-Aug 31, 2024
Was a deep tech intern at a hacker space in Dubai backed by The Residency! This covers both O.S.S. and Feed Forward as well.

Summary

Arrayah, is a hacker house supported by The Residency in Dubai, working on Offline Streaming Systems and Feed Forward. From the start, we were introduced to some incredible people in tech, and thanks to regular check-ins with Akshat and Guglielmo, we made progress on Offline Streaming Systems while getting inspired by guests in deep tech.

Midway through, we pivoted to Feed Forward, focusing on food waste solutions. The support from the Arrayah family was unmatched as we refined our pitch and business model. By demo day, after endless practice runs, we delievered what on what worked on. The experience was full of laughs, an oddly high amount of birthdays, and incredible energy. Huge thanks to everyone who supported us along the way!

Polaroid - Arrayah

Horizon Omega (HΩ)

Apr 26, 2024-Aug 08, 2024
Part of the Horizon Omega team!

Horizon Omega's start date is the date I started logging, not the date when the project started.

Log

Jun 10, 2024-Jul 25, 2024 Done! On to the next thing(s).
May 21, 2024-Jun 09, 2024 Preparing to host a seminar online.
May 09, 2024-May 20, 2024 Reviewed the table and sorted out my projects!
May 05, 2024 New workspace.
May 03, 2024 Another meeting!
Apr 26, 2024-Apr 30, 2024 Successful meeting! + organised the Notion.
Apr 26, 2024-Apr 30, 2024 Meeting soon!

OptX

Jan 04, 2023-Aug 08, 2024
Became part of OptX, my school's student-led initiative to provide opportunities to the youth. Trying to the best job I can.

Log

May 07, 2024-Jul 25, 2024 Some what back to it.
May 04, 2024 Discussions...
May 03, 2024 Certificates finally out!
May 02, 2024 Advised some juniors.
Apr 14, 2024-Apr 30, 2024 What's next? + Meeting!
Apr 13, 2024 OptX's flagship event for the year done!

OptX - TS2

Apr 07, 2024-Apr 13, 2024 Working on it...
Apr 06, 2024 Iftar Distribution 2.0 done!

Iftar Distribution 2.0

Mar 24, 2024-Apr 05, 2024 Progress!
Mar 14, 2024-Mar 23, 2024 Discussions...
Mar 10, 2024-Mar 13, 2024 Meeting!
Mar 05, 2024-Mar 06, 2024 We're back.
Feb 21, 2024-Feb 26, 2024 Bounce back.
Feb 15, 2024-Feb 20, 2024 Hm.
Dec 22, 2023-Feb 14, 2024 On to the next thing.
Dec 19, 2023-Dec 20, 2023 Fixed the certificates for our most recent event.
Dec 15, 2023 The youngins really outdid themselves, a spectacular event!

OptX - SHC Visit

Dec 11, 2023 Got back in to the loop.
Dec 01, 2023-Dec 04, 2023 Meeting + inaugural post!
Oct 07, 2023-Oct 17, 2023 Discussions are getting serious now.
Sep 04, 2023-Sep 22, 2023 Innovation wall + meeting!
Sep 01, 2023-Sep 03, 2023 RMC is officially over! Congrats to the winn... never mind.
Aug 22, 2023-Aug 25, 2023 Emails!
Aug 21, 2023 AC (x2)! Also, kind chap on the phone today.
Aug 20, 2023 Who turned off the AC?
Aug 12, 2023-Aug 17, 2023 Reel making competition is over now, a really sick reel was made by committee for India's independence day!
Aug 11, 2023 OptX astronomy centre visit happened successfully! Thank you to our incredible tour guides and to all those that had come!

OptX Astronomy

Aug 07, 2023-Aug 09, 2023 Yes, mind?
Aug 05, 2023-Aug 06, 2023 Never mind.
Aug 02, 2023-Aug 04, 2023 Astronomy!
Jul 29, 2023-Aug 01, 2023 Hm. This is an interesting fork in the road. At least there's kulfi.
Jul 28, 2023 Might need to concoct up something tomorrow, also, progress on a smaller event!
Jul 27, 2023 Somnething quite fun might be coming soon....
Jul 23, 2023-Jul 26, 2023 Launched!
Jul 19, 2023-Jul 22, 2023 Competition should be launched by the end of today...
Jul 18, 2023 Meeting!
Jul 15, 2023-Jul 17, 2023 A discussion may or may not have occurred.
Jul 09, 2023-Jul 13, 2023 An interesting thing might be coming up after this competition!
Jul 07, 2023-Jul 08, 2023 Sent the guidelines.
Jul 06, 2023 Really productive day, a certain social media competition coming soon!
Jul 05, 2023 Messages!
Jul 04, 2023 Got some discussions in.
Jun 27, 2023-Jun 29, 2023 Emails!
Jun 26, 2023 Got the discussion rolling again.
Jun 22, 2023 Had a really important meeting with a lawyer!
Jun 18, 2023 Got some really important discussions in.
Jun 12, 2023-Jun 17, 2023 Did some organisational work.
Jun 09, 2023-Jun 11, 2023 Conducted more research.
Jun 08, 2023 Discussed about (a) moot.
Jun 07, 2023 Did some organisational work.
Jun 05, 2023 Did some organisational work.
Jun 01, 2023-Jun 03, 2023 Followed on with a lead.
May 30, 2023-May 31, 2023 Got some leads (and sent out a template)!
May 29, 2023 Did some organisational work.
May 20, 2023-May 28, 2023 Had some interesting discussions.
May 15, 2023-May 19, 2023 Did some organisational work.
May 09, 2023-May 14, 2023 Did some organisational work.
May 08, 2023 Did some organisational work.
May 05, 2023-May 07, 2023 Did some organisational work.
May 04, 2023 Did some organisational work.
May 04, 2023 Really successful meeting!
May 03, 2023 Did some organisational work.
May 02, 2023 Breakthrough! (x2)
Apr 30, 2023-May 01, 2023 Breakthrough!
Apr 29, 2023 Follow-up, follow-up...
Apr 28, 2023 Finished sending out the certificates.
Apr 26, 2023 Sent some really important messages.
Apr 25, 2023 Got back from a contact.
Apr 23, 2023 Still finalizing certificates...
Apr 21, 2023-Apr 22, 2023 Worked on finalizing the certificates and gave some feedback for the reel.
Apr 20, 2023 Oh, it happened alright! It was a massive success, thank you to everyone who attended!

OptX Iftar Distribution Event

Apr 17, 2023-Apr 19, 2023 Everything seems to be in place...
Apr 12, 2023-Apr 16, 2023 First event in some time coming up very soon!
Apr 09, 2023-Apr 11, 2023 One of our smaller events had a lot of progress happen pretty spontaneously, and sent out an important message.
Apr 08, 2023 Did some organisational work and had a productive meeting.
Apr 06, 2023-Apr 07, 2023 Did some organisational work.
Apr 01, 2023-Apr 05, 2023 Did some organisational work, had a productive-ish meeting and got some more great advice!
Mar 31, 2023-Apr 01, 2023 Did some organisational work and got some great advice!
Mar 30, 2023 Had a productive meeting.
Mar 29, 2023 Re-scheduled a meeting.
Mar 28, 2023 Did some organisational work and had a meeting.
Mar 27, 2023 Did some organisational work.
Mar 24, 2023 Did the arithmetic mean of organisational work between Mar 22, 2023 and Mar 24, 2023.
Mar 24, 2023 Did a lot of organisational work.
Mar 22, 2023 Did some organisational work.
Mar 19, 2023 Did some organisational work.
Mar 16, 2023-Mar 18, 2023 Had two meetings and did some organisational work.
Mar 14, 2023-Mar 15, 2023 Did some organisational work.
Mar 13, 2023 Volunteered with OptX + two other students for Bridges of Giving. An incredibly fulfilling experience to say the least.

OptX - Bridges of Giving

Mar 11, 2023 Did a lot of organisational work. Really productive day for this project!
Mar 10, 2023 Did some organisational work.
Mar 09, 2023 Had a productive meeting and did some organisational work.
Mar 08, 2023 Did some organisational work.
Mar 07, 2023 Another meeting - wrapped up the discussion (mostly) for this year's plan and organised the Notion accordingly.
Mar 06, 2023 Had a fruitful dinner meeting!
Jan 27, 2023 Had a productive conversation!
Jan 17, 2023 Discussed next meeting.
Jan 04, 2023-Jan 14, 2023 Well, I initially thought that I would just be a volunteer for OptX's The Symposium 1.0, but roughly a day before the event (Jan 07, 2023), I became one of the newest committee member. In the end, The Symposium 1.0 was an incredible success. Seeing it all unfold was one of the greatest moments in my life.

OptX - The Symposium 1.0

EA UAE

Dec 29, 2022-Aug 08, 2024
A cold email led to me and another person co-founding EA UAE. Tried to make it as successful as possible.

Log

Jun 02, 2024-Jul 25, 2024 Some interesting follow-ups!
May 25, 2024 Weekly check-in.
May 09, 2024-May 19, 2024 An interesting update!
Mar 12, 2024-Apr 30, 2024 Getting back into it.
Jan 12, 2024-Feb 08, 2024 Had a small-scale meeting + working on something for future-proofing.
Jan 05, 2024-Jan 12, 2024 New member introduced and meeting soon!
Dec 28, 2023-Jan 05, 2024 Actually... Yeah, nope.
Dec 26, 2023 Welp, next year then!
Dec 18, 2023-Dec 25, 2023 Meet-up soon!
Dec 12, 2023 We'll be back soon with after this forthcoming meeting!
Nov 26, 2023 Should hopefully get more activity in the GC soon...
Oct 24, 2023-Oct 25, 2023 Discussion time!
Oct 07, 2023 Getting back into the swing of things.
Sep 24, 2023 Some, uh, interesting discussions...
Sep 18, 2023-Sep 23, 2023 Met with a professor virtually with my co-founder!
Sep 17, 2023 DYH!

EA UAE - DYH

Sep 11, 2023-Sep 15, 2023 New logo, new event!
Sep 09, 2023-Sep 10, 2023 Wrote up everything that I learnt, and we're back on track!
Sep 08, 2023 Finally met the EA NYUAD folk, an amazing dinner, thank you to all who attended!

EA UAE x EA NYUAD

Sep 03, 2023-Sep 06, 2023 Abu Dhabi, any one?
Aug 28, 2023-Sep 01, 2023 Progress! Then, a snafu, then progress!
Aug 22, 2023-Aug 27, 2023 Further discussion, and found a suitable compromise.
Aug 19, 2023-Aug 21, 2023 Incredible day(s): got the new set of logos (which look amazing) and a lot of headway on our next big thing!
Aug 18, 2023 Some admin work.
Aug 16, 2023 Gathertown!
Aug 10, 2023-Aug 15, 2023 Sent out the comprehensive message.
Aug 07, 2023-Aug 09, 2023 Airtable!
Aug 04, 2023-Aug 06, 2023 Solid progress.
Jul 30, 2023-Aug 03, 2023 Airtable are close to being fully up! Expecting a big splash sooner or later.
Jul 20, 2023-Jul 29, 2023 Got some discussions in with my co-founder + some organisational work.
Jul 19, 2023 All the plans are out and we're working on something important now!
Jul 18, 2023 Drafted a document.
Jul 17, 2023 Finished the plans for the non-outreach projects!
Jul 15, 2023 Finished my EA organiser application!
Jul 11, 2023-Jul 13, 2023 Got started with the next steps. Emails, Asana, oh my!
Jul 10, 2023 Follow-up to the meeting last week: was somewhat productive!
Jul 08, 2023-Jul 09, 2023 Lots of behind-the-scene work: emails and docs.
Jul 07, 2023 Really fruitful meeting!
Jul 06, 2023 Got a discussion going upon sending a EA Forum post.
Jul 05, 2023 Meeting scheduled!
Jul 04, 2023 Continued with my tasks assigned to me.
Jun 29, 2023-Jun 30, 2023 Learnt something interesting!
Jun 27, 2023-Jun 28, 2023 Got started with the next steps.
Jun 26, 2023 Had the most productive meeting yet! Really excited to get a lot of work done for this project over the summer.
Jun 18, 2023-Jun 22, 2023 Did some organisational work.
Jun 17, 2023 Webinar was a moderate success, and sent out some important messages!
Jun 15, 2023-Jun 16, 2023 Outreach, in the literal definition of the word.
Jun 12, 2023-Jun 14, 2023 Some really great news about our webinar!
Jun 10, 2023 Oddly, a lot of work for this project today.
May 29, 2023-Jun 09, 2023 Sent out message(s).
May 25, 2023-May 28, 2023 Did some organisational work.
May 15, 2023-May 24, 2023 Did some organisational work.
May 09, 2023-May 14, 2023 Did some organisational work. Going to go ahead with outreach + social media work.
May 06, 2023-May 08, 2023 Did some organisational work.
May 05, 2023 Did some organisational work.
May 04, 2023 Did some organisational work.
May 03, 2023 Did some organisational work.
May 02, 2023 Did some organisational work.
May 01, 2023 Did some organisational work.
Apr 30, 2023 Did some organisational work.
Apr 29, 2023 Successful meeting!
Apr 28, 2023 Got a meeting mostly organised.
Apr 23, 2023 Sent an email.
Apr 19, 2023-Apr 22, 2023 Did some organisational work.
Apr 18, 2023 Got a Graphic Designer on board!
Apr 12, 2023-Apr 16, 2023 Had a productive meeting and thinking about the next meet-up.
Apr 09, 2023-Apr 11, 2023 Our first event happened on Apr 10, 2023!

EA UAE

Apr 08, 2023 Did some organisational work (we might get a graphic designer on board!)
Apr 06, 2023-Apr 07, 2023 I think we're good to go!
Apr 01, 2023-Apr 05, 2023 Got the poster and form out - going to check the situation tomorrow and (mostly regardless) finalize everything.
Apr 01, 2023 Did some organisational work.
Mar 30, 2023-Mar 31, 2023 Postponed - but it'll happen.
Mar 29, 2023 I think we have a winner, folks...
Mar 28, 2023 Did some organisational work.
Mar 26, 2023-Mar 27, 2023 Did some organisational work - closing in on the actual booking.
Mar 25, 2023 Did some organisational work.
Mar 24, 2023 Short-listed the restaurant!
Mar 22, 2023 Did some organisational work.
Mar 20, 2023 Did some organisational work.
Mar 16, 2023-Mar 18, 2023 Did some organisational work.
Mar 12, 2023-Mar 15, 2023 Did some organisational work.
Mar 11, 2023 Did some organisational work.
Mar 10, 2023 Did some organisational work.
Mar 03, 2023-Mar 09, 2023 Did some organisational work.
Feb 20, 2023-Mar 03, 2023 Communication work and a meeting with EA NYUAD!
Feb 19, 2023 Finished meeting notes for yesterday's introductory meeting.
Feb 18, 2023 Had a stellar meeting with EA AUS for our introductory meeting!
Feb 17, 2023 Did some organisational work.
Feb 16, 2023 We've scheduled the introductory meeting for Saturday. Hope to see everyone there soon!
Feb 15, 2023 Had a great discussion with the executive board and got the introduction meeting date and time mostly sorted out.
Feb 11, 2023 Did some organisational work.
Feb 10, 2023 Did some organisational work.
Feb 09, 2023 Got a great meeting and some communication in!
Feb 08, 2023 Did some organisational work for tomorrow.
Feb 07, 2023 Did some organisational work.
Feb 05, 2023-Feb 06, 2023 Scheduled a meeting.
Feb 04, 2023 Did some organisational work and replied to an email.
Feb 03, 2023 Did some organisational work. Instagram page is much more lively now!
Feb 02, 2023 Did some organisational work.
Feb 01, 2023 Did some organisational work.
Jan 31, 2023 Had two productive meetings.
Jan 27, 2023 Had a productive meeting.
Jan 22, 2023-Jan 25, 2023 Sent out the Airtable and, in general, got a lot of work done for this project!
Jan 22, 2023 For now, finished with Airtable.
Jan 21, 2023 Figured out how to get data for Airtable and got started with a post.
Jan 20, 2023 Had a productive meeting!
Jan 18, 2023 Sent out a message.
Jan 17, 2023 Sent out an important email.
Jan 16, 2023 Still working with Airtable.
Jan 15, 2023 Worked with Airtable.
Dec 29, 2022-Jan 14, 2023 I think cold emails are an incredibly powerful tool that must be used responsibly. Before this, I thought that I was the "king of cold emails", as it led to the Effective Altruism Data and LPP project. However, I got dethroned when someone cold emailed after seeing this EA Forum question that I wrote quite some time back.

What was originally me being pessimistic about re-starting EA Dubai led to meetings with EA AUS, EA NYUAD and even an advisor from CEA! So far, we've gotten some EA AUS and EA NYUAD members to join us - and we're on the look out for someone else to help lead this project with us! I'm really excited to see where this project is after exactly half a year (July 14, 2023)!

AI Plans

Dec 18, 2023-Jul 10, 2024
I was formerly an active member of the AI Plans dev team.

AI Plans' start date is the date I started logging, not the date when the project started.

Log

May 19, 2024-Jul 10, 2024 Close call.
May 03, 2024-May 15, 2024 Conflict resolution + misc work.
Apr 26, 2024-May 02, 2024 Close!
Apr 21, 2024-Apr 25, 2024 Back from the dead.
Feb 19, 2024 ClickUp!
Feb 09, 2024-Feb 16, 2024 Let me tell you one thing.
Feb 08, 2024 Lots of progress slated for tomorrow night!
Jan 26, 2024-Feb 08, 2024 And we're back on track.
Jan 05, 2024-Jan 12, 2024 More progress!
Jan 05, 2024 Done! (well, my part at least)
Jan 04, 2024 Added another part!
Dec 30, 2023 Squash the bugs.
Dec 29, 2023 Making progress.
Dec 28, 2023 PR! (x2)
Dec 27, 2023 CSS, my old friend. (x2)
Dec 26, 2023 PR!
Dec 25, 2023 CSS, my old friend.
Dec 22, 2023-Dec 24, 2023 Bug resolved! On to the next step.
Dec 19, 2023-Dec 21, 2023 Continued with checking the database implementation.
Dec 18, 2023 Finished setting up the new build and got back to someone! Excited to get to work.

AI Safety Fundamentals: Governance Course

Mar 21, 2023-Jul 10, 2024
I was a fellow for AISF Governance 2024! I finished my project a bit later on however due to other commitments.

AI Safety Fundamentals: Governance Course's start date is the date I started logging, not the date when the project started.

Log

Jun 05, 2024-Jul 10, 2024 Eighth session done! On to the project.
May 29, 2024 Seventh session done!
May 22, 2024 Couldn't make it for the sixth, oh well.
May 15, 2024 Fifth session done! Should have prepared more.
May 08, 2024 Fourth session done! Debate was fun.
May 01, 2024 Third session done!
Apr 24, 2024 Second session done!
Mar 22, 2024-Apr 19, 2024 Icebreaker + First session done!
Mar 21, 2024 Will officially in mid-April.

AI Safety Fundamentals: Alignment Course

Feb 29, 2023-Jul 10, 2024
I was a fellow for AISF Alignment 2024! I finished my project a bit later on however due to other commitments.

AI Safety Fundamentals: Alignment Course's start date is the date I started logging, not the date when the project started.

Log

May 11, 2024-Jul 10, 2024 Couldn't attend the rest of the sessions, but will finish my project.
May 10, 2024 Session 8 done!
Apr 27, 2024 Session 7 done! That's the learning part done, now time to work on my project.
Apr 20, 2024 Session 6 done!
Apr 07, 2024-Apr 19, 2024 Covered up everything via two recap sessions!
Apr 06, 2024 Had to skip session 4, but will cover up tomorrow!
Mar 30, 2024 Session 3 done!
Mar 23, 2024 Session 2 done!
Mar 16, 2024 Session 1 done!
Mar 09, 2024 Session 0 done!
Feb 29, 2024 Will officially start after my exams.

Zerodha Varsity

Apr 26, 2024-Jun 28, 2024
Finished the Zerodha Varsity course till the third module (as I did not find much value beyond then).

Zerodha Varsity's start date is the date I started logging, not the date when the project started.

Log

Jun 23, 2024-Jun 28, 2024 Finished with the third module.
May 03, 2024-May 05, 2024 Back at it, continuing with the third module.
Apr 27, 2024-Apr 30, 2024 Got started with the third module.
Apr 26, 2024 Finished the first two modules!

Dioptra

Dec 18, 2023-Jun 07, 2024
Part of the Dioptra team, working on projects with them and trying to learn a lot in the process! Currently paused

Dioptra's start date is the date I started logging, not the date when the project started.

Log

Jun 07, 2024 My first paper has been published on arXiv!
Apr 27, 2024-Jun 06, 2024 Done. For real this time.
Apr 26, 2024 Need to speed up my code a bit before it reaches testing,
Mar 08, 2024-Apr 25, 2024 Done.
Mar 02, 2024-Mar 07, 2024 Looks to be... good.
Mar 01, 2024 Added a more in-depth communication implementation for the two agents.
Feb 28, 2024-Feb 29, 2024 Improvements! (x2)
Feb 19, 2024 Improvements!
Feb 09, 2024-Feb 17, 2024 Had a meeting, now done.
Feb 09, 2024-Feb 16, 2024 Done. Record time!
Feb 08, 2024 PR time!
Feb 02, 2024-Feb 03, 2024 Review time.
Jan 28, 2024-Jan 29, 2024 Done!
Jan 26, 2024-Jan 27, 2024 Closer.
Jan 13, 2024 Done. Finally.
Jan 06, 2024-Jan 12, 2024 Done-ish.
Jan 05, 2024 Scratch that, should be done by tomorrow. (x2)
Jan 03, 2024 Scratch that, should be done by tomorrow.
Dec 29, 2023 Should be done tomorrow.
Dec 27, 2023-Dec 28, 2023 Got some feedback again.
Dec 23, 2023-Dec 25, 2023 Done! (I think)
Dec 22, 2023 Finally, almost done.
Dec 19, 2023-Dec 21, 2023 Continued with the implementation of one of the games.
Dec 18, 2023 Had a great meeting! Excited to get this show on the road.

AI Safety Camp: VAISU

Dec 29, 2023-Jun 09, 2024
Inductee for AISC 2024! Part of Project #29: VAISU.

AI Safety Camp's start date is the date I started logging, not the date when the project started.

Retrospective

While not everything went smoothly, this event represents the culmination of countless nights working on the little things to make the process of being a speaker, giving your talk and inspiring others as smooth as possible, and there's untold value in having events like these always present for newcomers in the field.

VAISU

Log

May 23, 2024-Jun 09, 2024 And we're off to the races! Will present a better summary after the team retrospective is over.
May 13, 2024-May 22, 2024 Lot's of async work + last volunteer training session.
May 10, 2024-May 12, 2024 Mildly chaotic but everything worked out in the end!
May 09, 2024 Updated everyone on everything, really productive day.
May 07, 2024 1-on-1!
May 04, 2024 Volunteers!
May 03, 2024 Meeting x2!
May 01, 2024-May 02, 2024 Threads.
Apr 30, 2024 Successful 1-on-1!
Apr 26, 2024-Apr 29, 2024 Another meeting! Some 1-on-1 soon.
Feb 22, 2024-Apr 25, 2024 Miscellaneous stuff + meetings!
Feb 21, 2024 Meeting!
Feb 18, 2024-Feb 19, 2024 Finished website structure draft.
Feb 14, 2024-Feb 16, 2024 Slack.
Feb 06, 2024-Feb 13, 2024 Lots of progress!
Feb 03, 2024 Slack.
Feb 02, 2024 Asana? Asana!
Jan 29, 2024 Oh GitHub, where would I be without you?
Jan 28, 2024 Got back to someone about something!
Jan 26, 2024-Jan 27, 2024 Finished my share of work - woo-hoo! Just got a meeting to watch tomorrow...
Jan 17, 2024-Jan 23, 2024 Another successful meeting + admin work!
Jan 16, 2024 First team-wide meeting!
Jan 15, 2024 Had a lovely one-on-one with team member!
Jan 13, 2024 Meetings, oh yeah - meetings!
Jan 12, 2024 My first Gatheround ever!
Jan 04, 2024-Jan 05, 2024 A slide was added.
Dec 30, 2023 Summarized the last bit of feedback.
Dec 29, 2023 Got started!

Internship @ DPS Sharjah

May 15, 2024-May 30, 2024
Interning at my high school for a brief stint.

Retrospective

This internship was a lot (turns out, it's pretty hard to go back to waking up at 5:30 after thinking you're "done with school") but the conversations between teachers, mentors and friends are memories I'll cherish forever.

Internship

Log

May 25, 2024-May 29, 2024 Done! Retrospective soon.
May 25, 2024-May 29, 2024 Worked on some documents and presentations.
May 22, 2024 Lot's of, well, everything!
May 21, 2024 Lot's of walking.
May 20, 2024 Helped with some design work and went through a bunch of photographs.
May 17, 2024 Board + reel!
May 15, 2024 Got caught up with everything from the past two days.

Ocean Busters

Jul 08, 2023-May 10, 2024
I was formerly a blog writer and editor at Ocean Busters, a new organisation dedicated to effectively tackling ocean pollution.

Log

May 03, 2024-May 10, 2024 Buttons are fixed!
May 02, 2024 Back at it, been working on the website.
Oct 12, 2023 Finished editing for this month!
Sep 23, 2023 Finished editing for this month!
Sep 19, 2023 Admin for this month.
Aug 31, 2023 Done for this month!
Aug 20, 2023 Always expect the unexpected.
Aug 19, 2023 Submitted the blog post in record time.
Aug 12, 2023-Aug 18, 2023 Working with my new blog writer for this month!
Aug 07, 2023 August's theme has been announced!
Jul 29, 2023 Finished the blog post with my blog writer!
Jul 27, 2023-Jul 28, 2023 Reviewed the second draft. Nearly done (I think)!
Jul 22, 2023-Jul 25, 2023 Reviewed the draft and added comments.
Jul 21, 2023 Got the draft!
Jul 14, 2023-Jul 20, 2023 Did some organisational work.
Jul 13, 2023 Had a productive meeting.
Jul 11, 2023-Jul 12, 2023 Meeting soon!
Jul 09, 2023-Jul 10, 2023 Got in touch with my blog writer for this month (who's writing I'll be editing and proof-reading)
Jul 08, 2023 Got accepted! Interesting to see where this project goes (especially considering my Cold Takes project has been inactive for about half a year).

GMAMUN Jr.'24

Apr 28, 2023
Was head chair of the United Nations Office on Outer Space Affairs!

Summary

First (and probably last) time chairing was a decent success (even though I had skipped the first day, oh well - it was well worth it).

GMAMUN Jr.

Student Council - 12th + Head of Events

Mar 22, 2023-Jan 20, 2024
Became the vice head boy of my school. Tried to the best job I can. Also, I was the Head of Events for my school's environment club.

Log

Jan 20, 2024 I don't think I can ever bring myself to summarize all that I've learnt from this project of mine, but hey, what I can bring myself to is making a collage, I graduated, baby!:

Graduation 2024

Oct 26, 2023-Jan 20, 2024 The work is not done just yet.
Oct 09, 2023-Oct 26, 2023 What a month. Summary forthcoming!
Oct 08, 2023 College fair!

College Fair

Oct 06, 2023 (another EcoGen flash mob!)

EcoGen - Flash Mob - 2

Sep 25, 2023-Oct 05, 2023 Brown is quite a nice colour.
Sep 24, 2023 Don't be a donkey.
Sep 22, 2023 (also, EcoGen flash mob!)

EcoGen - Flash Mob

Sep 19, 2023-Sep 22, 2023 College. TEDx. Entrance.
Sep 19, 2023 All colours are beautiful.
Sep 16, 2023-Sep 17, 2023 Grading.
Sep 11, 2023-Sep 15, 2023 Everything. In. Between.
Sep 06, 2023-Sep 10, 2023 Everything in between!
Sep 05, 2023 Oh, it was.

Sep 01, 2023-Sep 04, 2023 The 5th is going to be an exciting day!
Aug 27, 2023-Sep 01, 2023 This has been the most productive week ever for this project: so, so much done.
Aug 23, 2023-Aug 27, 2023 Well, that was a productive summer!
Aug 22, 2023 Comprehensive enough?
Aug 20, 2023-Aug 21, 2023 2 years?!
Aug 19, 2023 The notebook is quite filled.
Aug 12, 2023-Aug 17, 2023 Lots of work: organised the grading for junior classes along with another head, sent out a comprehensive guide for English proficiency tests and continued with some projects on the side.
Aug 10, 2023-Aug 11, 2023 Lots of smaller, but important work! (pt. 2)
Jul 31, 2023-Aug 09, 2023 Lots of smaller, but important work!
Jul 28, 2023-Jul 30, 2023 Cubing was an interesting part of my life.
Jul 26, 2023-Jul 27, 2023 Proud Head of Events day!
Jul 26, 2023-Jul 27, 2023 Got word of permission for a project (which also leads to something pretty important)!
Jul 19, 2023-Jul 25, 2023 It's hard to describe the work that's been going on, but it is certainly something..
Jul 17, 2023-Jul 18, 2023 A lot of progress, but I hate forms.
Jul 16, 2023 Had a call and got a good amount of work in.
Jul 15, 2023 2 hour long meeting! Was fun (and productive).
Jul 08, 2023-Jul 14, 2023 So, much, environment, work.
Jul 07, 2023 Tech FTW!
Jul 04, 2023-Jul 05, 2023 Helped to get a message out.
Jun 27, 2023-Jun 29, 2023 Jackets!
Jun 26, 2023 Did some organisational work.
Jun 19, 2023-Jun 21, 2023 Got it done.
Jun 17, 2023-Jun 18, 2023 Did some organisational work, lots of work for this week!
Jun 10, 2023 Polls!
Jun 08, 2023 Checklist!
Jun 01, 2023 Done (for now).
May 30, 2023-May 31, 2023 Much smoother, in a way.
May 29, 2023 Still a bit left, but got the video fixed (yay!)
May 25, 2023-May 28, 2023 All done (soon).
May 20, 2023-May 24, 2023 Nearly (or fully?) done with a lot of smaller projects for this.
May 19, 2023 Got a lot of work done for both projects. Really happy!
May 18, 2023 Cameraman, anyone? Also, won best speaker for a motion in a debate, and lots of environment work.
May 15, 2023-May 17, 2023 Did some (really^3 important) organisational work.
May 09, 2023-May 14, 2023 Did some (really, really important) organisational work.
May 08, 2023 Did some (really important!) organisational work.
May 07, 2023 Did some organisational work.
May 06, 2023 Did some organisational work.
May 05, 2023 Did some organisational work.
May 03, 2023-May 04, 2023 Did some organisational work and a lot of writing for a proposal.
May 02, 2023 Did some organisational work and a morning event.
Apr 30, 2023-May 01, 2023 Did some organisational work and partook in a successful morning event.
Apr 29, 2023 Got some important messages + a template out yesterday.
Apr 28, 2023 Incredible day.

Investiture Ceremony

Apr 26, 2023 Got a speech ready and many rehersals (my knee can atest) done + dance was conducted somewhat successfully and an awesome Instagram post.
Apr 24, 2023-Apr 25, 2023 Worked on a video, event should go smoothly for tomorrow and day after.
Apr 23, 2023 Sorted out a technical issue + got content/photos for a post idea that I came up with! (worked on the main document a bit as well)
Apr 19, 2023-Apr 22, 2023 Did some organisational work.
Apr 17, 2023-Apr 19, 2023 Got a lot of work and recording done for an event.
Apr 11, 2023-Apr 16 2023 Communication is key.
Apr 09, 2023-Apr 11, 2023 Did a lot of organisational work and generally, got a lot done!
Apr 08, 2023 Had a fruitful discussion with the design team!
Apr 06, 2023-Apr 07, 2023 Finished a document and getting some ideas for EC!
Apr 01, 2023-Apr 05, 2023 Lots of voting and discussions - but we're done with colour scheme.
Apr 01, 2023 Sent out the video draft (that another person worked on!) for the event in May and helped to sort out a mini-crisis.
Mar 31, 2023 Did some organisational work.
Mar 30, 2023 Had a productive meeting for event in May.
Mar 29, 2023 Top 6 now - also need to get better videos tomorrow...
Mar 28, 2023 Compiled the top 8. Waiting for results (+ more democracy!). Also, (a pretty fun but productive) meeting for event in May.
Mar 26, 2023-Mar 27, 2023 Colour - so trivial yet so important. Also, all applications are now sorted (EC)
Mar 25, 2023 Worked on compiling designs and setting up voting, and also contacted someone.
Summary of Environment Club (EC) Work: Will merge this log with this one. After my student council work in 11th, I mostly just had meetings, an application form for this academic year (which I finished) and a run!
Mar 23, 2023-Mar 24, 2023 Did some organisational work.
Mar 22, 2023 Finished initial organising work and informed a section of the council about an upcoming task.

AUS CSE Research Assistant

Jun 12, 2023-Dec 29, 2023
Currently a research assistant for the computer science and engineering department at the American University of Sharjah. Will continue after my examinations this last month of the year.

Log

Oct 09, 2023-Oct 11, 2023 I think I'm at a good point to end this project. This has, without a doubt, been one of the most important projects in my life, ever. Will definitely pay a visit to the campus before leaving for college!
Oct 09, 2023-Oct 11, 2023 Got the training results up on the AI lab machine!
Sep 24, 2023 Finally, some good progress.
Sep 17, 2023 Met my co-RA in-person!
Sep 10, 2023 Solid plan for the next four to five days, excited!
Sep 08, 2023 Back to normal training results.
Sep 03, 2023 Sent out the report.
Aug 31, 2023 Met my professor onsite! Really reassured now, going to continue on with a really sweet end-goal in mind!

AUS - Part Two

Aug 21, 2023-Aug 25, 2023 Spoke with my professor and co-RA.
Aug 20, 2023 Jeez, the results are quite poor. Going to need to get back to Paperspace soon.
Aug 12, 2023-Aug 17, 2023 Experimented with VAEs and GANs - going to move on now to expanding the dataset and re-training.
Aug 11, 2023 Some lukewarm results again, better than run-through at least!
Aug 08, 2023 Hm, running into a snafu with my code. Will check what's up tomorrow.
Aug 07, 2023 Heard back from my co-RA!
Aug 06, 2023 Man, my data processing work sort of meant nothing today. Oh well, we move.
Aug 05, 2023 You can only increase the batch size so much.
Aug 04, 2023 Some great results for the first day with the data!
Aug 02, 2023 Spoke with my co-RA!
Aug 01, 2023 Took a cursory look at the data.
Jul 29, 2023-Jul 31, 2023 The end of this month lined up perfectly with the end of the first part of this project, excited for the next step!
Jul 28, 2023-Jul 29, 2023 Going to move on to analysing why the model had performed poorly on FashionMNIST, but quite well on CIFAR-10.
Jul 27, 2023 In the meanwhile, tried my hand at FashionMNIST. Did not go so well.
Jul 24, 2023-Jul 25, 2023 CIFAR-10 training done, going to try out Tiny ImageNet next to end of training before the CameraTrap part of my research (hopefully!)
Jul 23, 2023 CIFAR-10 training should be done tomorrow morning!
Jul 22, 2023 Switched to Gradient.
Jul 21, 2023 CIFAR-10 is showing great results!
Jul 19, 2023-Jul 20, 2023 We back to training.
Jul 18, 2023 Why is Google so stingy?
Jul 17, 2023 Day 4b) happened! Got the 240 x 240 data set, and I think the model is better?
Jul 15, 2023 Pre-lude to Day 4b) tomorrow.
Jul 12, 2023 Day 4a) I guess.
Jul 10, 2023 Heard back from my professor.
Jul 08, 2023 Training, will see its results by tonight (hopefully, else it might time out)
Jul 07, 2023 Need to train it on the larger dataset tomorrow, had some troubles with it today.
Jul 06, 2023 I did it! Finally got some results on ImageNette (a smaller version of ImageNet) and while they're not very good, at least I'm somewhere tangible now!
Jul 05, 2023 So close.
Jul 02, 2023 Closer.
Jul 01, 2023 More time needed.
Jun 30, 2023 Finished my notes on the repository and, in my efforts of trying to get the results on CIFAR-10, ran into a bug that I could not squash in time. Will continue tomorrow.
Jun 25, 2023-Jun 27, 2023 Thoroughly went through a repository - really interesting stuff! Only one roadblock is the difference between two models, but I'm sure I'll figure that out tomorrow.
Jun 22, 2023 Read two academic papers.
Jun 21, 2023 Read three academic papers.
Jun 12, 2023 First day! Learnt a lot about transformers.

Advent of Code 2023

Dec 01, 2023-Dec 22, 2023
Tried to solve all the coding problems for 2023's Advent of Code!

Log

Dec 19, 2023-Dec 22, 2023 Going to throw in the towel, finished with 21 stars. Can hopefully come back next year to finish this year off fully + 2024's edition! In the meantime, was a lot of fun (if not hair pulling at times)
Dec 06, 2023-Dec 19, 2023 Finished a couple of problems, won't be able to finish all problems in time - but that's alright!
Dec 05, 2023 Sixth problem done!
Dec 05, 2023 Fifth problem done!
Dec 04, 2023 Fourth problem done!
Dec 03, 2023 Third problem done!
Dec 02, 2023 Second problem done!
Dec 01, 2023 First problem done!

Gratis 2023

Dec 07, 2023-Dec 14, 2023
Was the drummer for Band 2 - and played the drums for two songs for our annual Gratis event

Summary

Greatest gig in the sky.

Gratis

DXBMUN 2023

Dec 08, 2023-Dec 10, 2023
Was the delegate of Nigeria for the United Nations Office on Drugs and Crime, won outstanding delegate!

Summary

May not have been the best MUN I've attended, but god damn was it fun at times - if not very stressful. Still, walked away with a win!

DXBMUN

NMSMUN 2023

Oct 21, 2023-Oct 22, 2023
Was the delegate of France for the Special Committee on Peacekeeping Operations, won best delegate and best delegation!

Summary

What an eventful MUN: from the delegate of Russia tearing up my placard to the various spars between me and Russia and DPRK: I am glad that, in the end, a great resolution was passed and we were able to enjoy the fruits of all of our labour!

NMSMUN

Project: Unboxed

Oct 13, 2023-Oct 14, 2023
Student moderator for the metaverse committee!

Summary

A really enjoyable experience overall: my sir present during the committee was really informative and thoughtful, and the whole committee came to rational conclusions without much bickering, also gave a short speech as part of the panel discussion!

Project - Unboxed

TEDxYouth@DPSS 2023

Jul 08, 2023-Sep 30, 2023
Formerly the co-event organiser for my school's second edition TEDxYouth!

Log

Sep 30, 2023 Success!

TEDxYouth

Sep 19, 2023-Sep 29, 2023 Last week.
Sep 18, 2023-Sep 19, 2023 Salute to all PAs. Heroes don't often wear capes.
Sep 16, 2023-Sep 17, 2023 Stellar progress!
Sep 11, 2023-Sep 15, 2023 Social media! Everything is mostly coming together.
Sep 06, 2023-Sep 10, 2023 We're close in some regards, really close.
Sep 05, 2023-Sep 06, 2023 Two really, really productive days!
Sep 04, 2023 Outreach meeting.
Sep 01, 2023-Sep 03, 2023 Check-ins.
Aug 30, 2023 Filming day complete! Hugely successful and really fun!

TEDx - Filming

Aug 30, 2023 Meeting!
Aug 23, 2023-Aug 27, 2023 Major progress and got up to speed.
Aug 22, 2023 A lot happened today: started out a bit disheartening but ended on a positive note!
Aug 18, 2023-Aug 21, 2023 Finished a new draft of the script.
Aug 12, 2023-Aug 17, 2023 Outreach, a small crisis in media and finalising the trailer.
Aug 10, 2023-Aug 11, 2023 Press!
Aug 09, 2023 Outreach.
Aug 08, 2023 Photography!
Aug 06, 2023 Recording, recording.
Aug 06, 2023 Recording, recording.
Aug 03, 2023-Aug 05, 2023 Lots of press (and some media) work!
Aug 02, 2023 Gotta test out a camera soon.
Jul 31, 2023 Got (and shared) some great sponsorship advice.
Jul 27, 2023-Jul 29, 2023 Media's turn!
Jul 26, 2023 Checked-in with outreach - some good progress
Jul 23, 2023-Jul 24, 2023 Cameras have been sorted!
Jul 19, 2023-Jul 22, 2023 Did some media & outreach check-ins.
Jul 18, 2023 An interesting day.
Jul 17, 2023 Completely opposite to yesterday, so much progress!
Jul 16, 2023 Things have gone, noticably quiet...
Jul 13, 2023-Jul 15, 2023 I have a lot of respect for our editorial board.
Jul 12, 2023 Files!
Jul 11, 2023 Messages.
Jul 09, 2023-Jul 10, 2023 A lot of progress on the smaller things, really happy to see!
Jul 08, 2023 From a rocky start (with me sending out a pretty poorly worded message out) to getting settled in to the role to forming our incredible two teams leaves us at this moment right now: with about two months left for the event, things are going to start picking up a lot of momentum now!

Arjun's AI Escapades Class

Aug 15, 2023-Aug 27, 2023
Hosting a series of machine learning and AI safety classes this summer!

Aug 27, 2023 Third (and final, for now) class done! Extremely grateful to have been able to teach 25+ seniors something that I'm truly passionate about.
Aug 24, 2023-Aug 26, 2023 Time sheet!
Aug 19, 2023 Announced the second edition.
Aug 17, 2023 Second class done! Was also a huge success (one my students coincidentally thought of the first thing I teach in second half of the class lol):

AAE - Second

Aug 15, 2023 Got the presentation done in the nick of time, and a successful first class!

AAE - First

RTA Hackathon

Aug 24, 2023-Aug 25, 2023
Participated in RTA's sustainability ~hackathon!

Summary

A lot of work happened before the start date given here: including finalizing our idea (an app to provide a sustainable transport mode given a particular route) and many meetings. But overall, it was a fun (and exhausting) time that had an incredible class on entrepreneurship on the first day! Glad to have been a part of this chaos.

RTA Hackathon

SOLARIS (Third Edition)

Jul 08, 2023-Aug 24, 2023
One last rodeo this summer! Excited to be teaching our ten incredible students.

Aug 20, 2023-Aug 24, 2023 Certificates, and nudged for one of the projects to be published!
Aug 12, 2023-Aug 19, 2023 One of them is really, really incredible.
Aug 10, 2023 Last capstone project received!
Aug 08, 2023 Second and third capstone project received! One more...
Aug 06, 2023 First capstone project received!
Jul 29, 2023-Aug 05, 2023 All capstone project ideas should be finalised now!
Jul 27, 2023-Jul 28, 2023 Answered a doubt(s).
Jul 26, 2023 And that's a wrap! Capstone project time.

SOLARIS - 3

Jul 21, 2023-Jul 25, 2023 Did some organisational work.
Jul 20, 2023 Fourth day done!
Jul 19, 2023 Did some organisational work.
Jul 18, 2023 Third day done!
Jul 15, 2023-Jul 17, 2023 Did some organisational work.
Jul 13, 2023 Second day done!
Jul 12, 2023 Welp, got postponed to tomorrow.
Jul 11, 2023 First day done!
Jul 08, 2023 With all the prep work out of the way, just a couple days left before the first class!

Mathematics for Machine Learning

Jul 04, 2022-Aug 22, 2023
Learnt the linear algebra, multivariate calculus and principal component analysis behind machine learning.

Log

Aug 19, 2023-Aug 22, 2023 Finished the penultimate week, and finished the course, thus marking the end of this project!
Aug 17, 2023 Admin work, will finish this project for good by Tuesday.
Aug 07, 2023-Aug 16, 2023 Better late than never.
May 07, 2023 Continued with Week 3.
Mar 20, 2023 Continued with Week 3.
Mar 19, 2023 "Continued" with Week 3.
Mar 18, 2023 Continued with Week 3.
Mar 15, 2023 "Continued" with the course.
Mar 14, 2023 "Continued" with the course.
Mar 11, 2023 Finally finished week 1 after finishing week 2.
Mar 10, 2023 Figured out the cov_naive(x) function!
Mar 09, 2023 Trying to finish week 1.
Mar 08, 2023 Finished with week 2, for the most part.
Mar 07, 2023 Finished my programming assignment for week 2!
Feb 19, 2023 Continued with the course.
Feb 18, 2023 Continued with the course. My programming assignment for week 2 needs a lot more work (and I haven't even finished my week 1 programming assignment...).
Feb 17, 2023 Continued with the course.
Feb 16, 2023 Continued with the course.
Feb 15, 2023 Continued with the course.
Feb 12, 2023 Continued with the course.
Feb 11, 2023 Continued with the course.
Feb 10, 2023 Continued with the course.
Feb 09, 2023 Continued with the course.
Feb 08, 2023 Continued with the course.
Feb 07, 2023 Continued with the course.
Feb 06, 2023 Continued with the course.
Feb 04, 2023 Continued with the course.
Feb 03, 2023 Made good progress on the programming assignment for Week 1.
Feb 02, 2023 Continued with the course.
Feb 01, 2023 Continued with the course.
Jan 27, 2023 Continued with the course.
Jan 25, 2023 "Continued" with the course.
Jan 22, 2023 Continued with the course.
Jan 21, 2023 Continued with the course.
Jan 20, 2023 Continued with the course.
Jan 19, 2023 "Continued" with the course.
Jan 18, 2023 Continued with the course.
Jan 17, 2023 "Continued" with the course.
Jan 16, 2023 "Continued" with the course.
Jan 15, 2023 "Continued" with the course.
Jan 04, 2023-Jan 11, 2023 "Continued" with the course.
Jan 04, 2023 Continued with Week 1 and got 100% on the practice quiz!
Jan 03, 2023 Continued with Week 1.
Jan 02, 2023 Got started with Week 1 of Principal Component Analysis.
Dec 19, 2022 Finished with Week 6 and hence finished with the multivariate calculus course! Will (hopefully) start Principal Component Analysis on Jan 2023.
Dec 18, 2022 Nearly finished with Week 6.
Dec 17, 2022 Finished with Week 5.
Dec 16, 2022 Continued with Week 5, nearly done after passing a really hard assignment.
Nov 18, 2022 Continued with Week 5.
Nov 09, 2022 "Continued" with "Week 5".
Nov 08, 2022 "Continued" with "Week 5".
Nov 04, 2022 "Continued" with "Week 5".
Nov 03, 2022 Continued with Week 5.
Nov 02, 2022 "Continued" with "Week 5".
Nov 01, 2022 Continued with Week 5.
Oct 31, 2022 Continued with Week 5.
Oct 30, 2022 Continued with Week 5.
Oct 29, 2022 Continued with Week 5.
Oct 28, 2022 Continued with Week 5.
Oct 27, 2022 Got started with Week 5.
Oct 26, 2022 Finished with Week 4.
Oct 25, 2022 Continued with Week 4.
Oct 24, 2022 Continued with Week 4.
Oct 23, 2022 Continued with Week 4 and got 95% on my practice quiz on the first attempt!
Oct 22, 2022 Continued with Week 4.
Oct 21, 2022 Continued with Week 4.
Oct 19, 2022 Continued with Week 4.
Oct 18, 2022 Continued with Week 4.
Oct 17, 2022 Continued with Week 4.
Oct 16, 2022 Continued with Week 4.
Oct 11, 2022 Continued with Week 4.
Oct 10, 2022 Got started with Week 4.
Oct 09, 2022 Got started with Week 4.
Oct 08, 2022 Finished with Week 3! Here's my backpropagation submission:
Oct 07, 2022 Continued with Week 3.
Oct 06, 2022 Continued with Week 3.
Oct 05, 2022 Continued with Week 3.
Oct 04, 2022 Continued with Week 3.
Sep 30, 2022 "Continued" with Week 3.
Sep 29, 2022 Continued with Week 3 and got 100% on the practice quiz!
Sep 28, 2022 Continued (?) with Week 3.
Sep 27, 2022 Continued (?) with Week 3.
Sep 26, 2022 Continued with Week 3.
Sep 25, 2022 Got started with Week 3.
Sep 18, 2022 Finished with Week 2 and got 100% on the practice quiz!
Sep 04, 2022 Continued with Week 2. Nearly done.
Aug 26, 2022 Continued with Week 2 and got 100% on the practice quiz!
Aug 25, 2022 Continued with Week 2 and learnt about the Hessian.
Aug 24, 2022 Continued with Week 2.
Aug 23, 2022 Continued with Week 2.
Aug 22, 2022 Continued with Week 2.
Aug 20, 2022 Continued with Week 2.
Aug 19, 2022 Continued with Week 2.
Aug 18, 2022 Continued with Week 2 and got 100% on the practice quiz!
Aug 17, 2022 Continued with Week 2 and learnt about the Jacobian.
Aug 16, 2022 Got started with Week 2.
Aug 15, 2022 Finished with Week 1 and got 100% on the final quiz!
Aug 14, 2022 Continued with Week 1. Nearly (nearly) done.
Aug 13, 2022 Continued with Week 1. Nearly done.
Aug 12, 2022 Continued with Week 1.
Aug 11, 2022 Continued with Week 1.
Aug 10, 2022 Continued with Week 1.
Aug 09, 2022 Finished and earned my certificate for the Linear Algebra course!
Aug 08, 2022 Got started with the final assessment for linear algebra.
Aug 07, 2022 Finished the last programming assignment for Week 5 and continued with Week 1 (Calculus), going to finish the linear algebra course tomorrow!
Aug 06, 2022 Continued with Week 5 and Week 1 (Calculus).
Aug 04, 2022 Continued with Week 5 and learnt about PageRank. Lots to finish up tomorrow (and review simultaneously) so I can focus on multivariate calculus.
Aug 02, 2022 Continued with Week 5 and learnt about eigenbasis.
Aug 01, 2022 Continued with Week 5 after passing the second eigenvector quiz.
Jul 31, 2022 Continued with Week 5.
Jul 30, 2022 Continued with Week 5 (LA) and got started with the multivariate calculus (MC) course!
Jul 29, 2022 Continued with Week 5 and finally learnt what eigenvalues are!
Jul 28, 2022 Continued with Week 5. I finally know, at least on a surface level, what eigenvectors are. But what about eigenvalues?
Jul 27, 2022 Got started with Week 5.
Jul 26, 2022 Finished with Week 4.
Jul 25, 2022 Nearly finished with Week 4.
Jul 23, 2022 Continued with Week 4 and learnt about transforming a matrix in another plane (in an easier way). I'm going to miss David Dye, he was a phenomenal lecturer in this course.
Jul 21, 2022 Continued with Week 4 and got a perfect score on my Gram-Schmidt assignement on first submit.
Jul 20, 2022 Continued with Week 4 and learnt about the Gram-Schmidt process.
Jul 19, 2022 Continued with Week 4 and learnt about transposing a matrix and orthonormal matrices.
Jul 18, 2022 Continued with Week 4.
Jul 17, 2022 Just passed the hard practice test for this week on first attempt.
Jul 16, 2022 Got started with Week 4 and learnt about Einstein's summation convention and symmetry with the dot product.
Jul 15, 2022 Finished with Week 3.
Jul 14, 2022 Nearly finished with Week 3.
Jul 12, 2022 Learnt about matrix inverses and Gaussian Elimination.
Jul 11, 2022 Finished with the matrix transformation quiz.
Jul 10, 2022 Learnt about matrix transformations.
Jul 09, 2022 Got started with week 3 with matrices.
Jul 08, 2022 Finished with week 2!
Jul 07, 2022 Learnt about changing basis and got another 100%!
Jul 06, 2022 Finished with week 1 (the reply thing wasn't optional lol), learnt about the dot product with the cosine rule, projects and got 100% on the quiz!
Jul 05, 2022 Learnt about operations, modulus and dot product.
Jul 04, 2022 Got started with the course!

YCM Youth Meet-up

Aug 10, 2023
Attended Youth Creative Minds' Youth meet-up!

Summary

Had a great time at Khaleej Times x YCM's youth meet-up, got a chance to speak about climate denialism and it was, overall, a fun experience meeting some of my seniors!

Khaleej Times

Machine Learning Safety Course

Jun 24, 2023
~Finished the ML Safety course (Intro to ML Safety) in one day and made a guide/blog post on it.

Summary

This was quite an experience - finished going through the ML Safety Course by the Center for AI Safety and made a guide/post from my notes.

SOLARIS (Second Edition)

Dec 24, 2022-Jul 01, 2023
Trying to co-run the second edition of a logic, rationality and Effective Altruism club that I co-founded. Currently inactive/paused.

Log

Jul 01, 2023 Sent out the certificates. See y'all for the last SOLARIS that I'll be facilitating!
Mar 16, 2023-Mar 18, 2023 Did some organisational work.
Mar 15, 2023 Did some organisational work.
Feb 01, 2023 Sent out my three capstone project reviews.
Jan 27, 2023 Had the last meeting for a while, thus marking the end of this project (for now!)
Jan 25, 2023 Scheduled the last meeting for a while.
Jan 21, 2023 Finished reviewing two more capstone projects.
Jan 20, 2023 Reviewed the first capstone project.
Jan 18, 2023 Received capstone projects. Closing ceremony will be delayed but for now, will host an online meeting to discuss the projects.
Jan 17, 2023 In discussion regarding the closing ceremony.
Jan 16, 2023 In discussion regarding the closing ceremony.
Jan 05, 2023-Jan 14, 2023 Did some more organisational work, held the last (technically fourth) day and sent out the capstone project submission form!
Jan 04, 2023 Did some organisational work.
Jan 03, 2023 Did some organisational work.
Jan 02, 2023 Did some organisational work.
Jan 01, 2023 Did some organisational work.
Dec 31, 2022 Did some more organisational work. Here's to this project becoming even more ambitious in 2023!
Dec 30, 2022 Did some organisational work in the morning, but I couldn't teach today's class due to internet issues. We'll be combining this session and the last day (which I feel is something we should do regardless).
Dec 28, 2022 An okay third day, but this part of the syllabus really needs to be re-vamped.
Dec 26, 2022 Second day went better than the first: espicially since we had really good debate responses and rebuttals.
Dec 24, 2022 First day! Along with my co-facilitator, we gave a good overview about rationality.

GFSMUN III

Jun 23, 2023-Jun 25, 2023
Attended GFSMUN 2023 as part of my school team, and won best speaker!

Summary

From ditching a portion of the first day (and missing my chance for a GSL) for prom to the odd crisis where I became Mark Zuckerberg to me beefing with the delegate of Nigeria (who won best delegate, well deserved!), GFSMUN III and the United Nations Office for Outer Space Affairs was one heck of a MUN and committee respectively. Shout out to my incredible chairs (who nit-picked on the number of hours I stated on my first position paper lol)

GFSMUN III

Local Hackathon 2023

Jun 19, 2023-Jun 20, 2023
From participant to organiser this time around! The start date for this project represents when the auditions were conducted.

Summary

From the okay-ish auditions (which were mostly my doing) came a really fun hackathon: the teams were assigned to create an encryption/decryption app using Tkinter in Python. In the beginning, a fun plot line involving the FBI/CIA and spying emerged. Was quite fun!

Local Hackathon - 2023

YGSS 2023

May 12, 2023-May 14, 2023
I was a resource head for the Earth and Climate Change Council and a member of the IT team. Won best counci.l

Summary

This whole project should be prefaced by the sheer amount of work that had gone into it: from my main work as a resource head for the Earth and Climate Change council: working on the agenda document, the background guide and the video with my co-resource head and directors - as well as helping out with the website as part of the IT team.

With that being said, what an incredible event, so glad to have been (somewhat) randomly selected for ECC - I'd like to think I was a pretty darn good resource head, and won best council with my incredible directors, co-resource head, IT and press members.

ECC

freeCodeCamp

Oct 28, 2021-Mar 18, 2023
Trying to finish freeCodeCamp.org's curriculum by the end of 2023.

freeCodeCamp.org's start date is the date I started logging, not the date when the project started.

Log

May 07, 2023 Happy to call an end to this project - really proud of all the certificates that I've earned and the mini-projects I made for them. As I mentioned in one of my blog posts for 2022, I won't (and have not yet) hesitate to recommend freeCodeCamp to anyone who wishes to learn how to code.
Mar 18, 2023 Continued with the Data Analysis with Python course.
Jan 27, 2023 "Continued" with the Medical Data Visualizer project.
Jan 25, 2023 "Continued" with the Medical Data Visualizer project.
Jan 21, 2023 "Continued" with the Medical Data Visualizer project.
Jan 20, 2023 Continued with the Medical Data Visualizer project.
Jan 18, 2023 Continued with the Medical Data Visualizer project.
Jan 16, 2023 "Continued" with the Medical Data Visualizer project.
Jan 04, 2023 Continued with the Medical Data Visualizer project.
Jan 03, 2023 "Continued" with the Medical Data Visualizer project.
Jan 02, 2023 "Got started" with the Medical Data Visualizer project.
Jan 01, 2023 Finished the Demographic Data Analyzer Project (here it is).
Dec 31, 2022 Continued with the Demographic Data Analyzer project. Figured out the roadblock. I hope to finish the last three remaining certificates by the first half of 2023.
Dec 30, 2022 Continued with the Demographic Data Analyzer project. Sort of hit a roadblock, but I'll figure it out (hopefully).
Dec 29, 2022 Continued with the Demographic Data Analyzer project.
Dec 28, 2022 Got started with the Demographic Data Analyzer project.
Dec 27, 2022 Finished with the Mean-Variance-Standard Deviation Calculator project (here it is).
Dec 26, 2022 Continued with Data Analysis with Python.
Dec 25, 2022 Continued with Data Analysis with Python.
Dec 24, 2022 Continued with Data Analysis with Python.
Dec 23, 2022 Continued with Data Analysis with Python.
Dec 22, 2022 Continued with Data Analysis with Python.
Dec 21, 2022 Continued with Data Analysis with Python.
Dec 20, 2022 Got started with Data Analysis with Python.
Dec 19, 2022 Finished with the Probability Calculator Project project (here it is) and earned my certification for Scientific Computing with Python (yes, I know the budget app project isn't fully finished, but I wanted to move on). Only three more certifications left!
Dec 18, 2022 Finished with the Polygon Area Calculator Project project (here it is).
Dec 16, 2022 Been a while. Continued with the Budget App Project and I plan to just finish my Python certification before the end of the year (and early next year, try to finish databases).
Nov 26, 2022 "Continued" with the Budget App Project.
Nov 18, 2022 Continued with the Budget App Project.
Nov 16, 2022 "Continued" with the Budget App Project.
Nov 15, 2022 Continued with the Budget App Project.
Nov 13, 2022 Continued with the Budget App Project.
Nov 12, 2022 Continued with the Budget App Project. Should finish up this upcoming week.
Nov 11, 2022 Continued with the Budget App Project.
Nov 10, 2022 Continued with the Budget App Project.
Nov 09, 2022 Continued with the Budget App Project.
Nov 08, 2022 Continued with the Budget App Project.
Nov 04, 2022 Continued with the Budget App Project.
Nov 03, 2022 Continued with the Budget App Project.
Nov 02, 2022 Continued with the Budget App Project.
Nov 01, 2022 Continued with the Budget App Project.
Oct 31, 2022 Continued with the Budget App Project.
Oct 30, 2022 Continued with the Budget App Project.
Oct 29, 2022 Got started with the Budget App Project.
Oct 28, 2022 1 year since this project started! Finished with the Time Calculator Project, here it is.
Oct 27, 2022 Continued with the Time Calculator Project. Writing down my logic really helped, really close now (just need to fix the AM/PM and -12 logic for 24-hour format).
Oct 26, 2022 "Continued" with the Time Calculator Project.
Oct 25, 2022 Continued with the Time Calculator Project. Need to map out my logic on paper tomorrow to see where I'm going wrong.
Oct 24, 2022 Continued with the Time Calculator Project. Getting somewhat close.
Oct 23, 2022 Continued with the Time Calculator Project.
Oct 22, 2022 Continued with the Time Calculator Project.
Oct 21, 2022 Continued with the Time Calculator Project.
Oct 20, 2022 Continued with the Time Calculator Project.
Oct 19, 2022 Continued with the Time Calculator Project.
Oct 18, 2022 Continued with the Time Calculator Project.
Oct 17, 2022 Never mind, I won't finish the project today, but I made some great progress! I think I just need to fix the AM/PM and calculate next days.
Oct 16, 2022 Continued with the Time Calculator Project. I'll try to finish this project by Oct 17.
Oct 11, 2022 Got started with the Time Calculator Project.
Oct 10, 2022 Finished with the Arithmetic Formatter project! Here it is.
Oct 09, 2022 Continued with the Arithmetic Formatter project. Still can't get the test cases to pass but I think I'm getting close.
Oct 08, 2022 Continued with the Arithmetic Formatter project. I can't get my solution to pass the test cases (even though the output looks to be correct) for some reason, will keep trying tomorrow.
Oct 07, 2022 Continued with the Arithmetic Formatter project and fixed the alignment of the numbers! Will finish the project tomorrow.
Oct 06, 2022 Continued with the Arithmetic Formatter project.
Oct 05, 2022 Continued with the Arithmetic Formatter project. I'm sort of close to fixing the arrangement.
Oct 04, 2022 Continued with the Arithmetic Formatter project.
Oct 02, 2022 Continued with the Arithmetic Formatter project.
Oct 01, 2022 Continued with the Arithmetic Formatter project.
Sep 30, 2022 "Continued" with the Arithmetic Formatter project.
Sep 29, 2022 Continued with the Arithmetic Formatter project.
Sep 28, 2022 Continued with the Arithmetic Formatter project.
Sep 27, 2022 Got started with Relational Database.
Sep 26, 2022 Continued with Responsive Web Design.
Sep 25, 2022 Continued (?) with the Arithmetic Formatter project and continued with Responsive Web Design.
Sep 24, 2022 Continued with Responsive Web Design.
Sep 23, 2022 Continued with Responsive Web Design.
Sep 22, 2022 Continued with Responsive Web Design.
Sep 21, 2022 Continued with Responsive Web Design.
Sep 20, 2022 Continued with Responsive Web Design.
Sep 19, 2022 Continued with Responsive Web Design.
Sep 18, 2022 Progress! I finally got the problems to print horizontally for the Arithmetic Formatter project. Also continued with Responsive Web Design.
Sep 17, 2022 "Continued" with the Arithmetic Formatter project and continued with Responsive Web Design.
Sep 16, 2022 Continued with the Arithmetic Formatter project and continued with Responsive Web Design.
Sep 15, 2022 Continued with the Arithmetic Formatter project and continued with Responsive Web Design.
Sep 14, 2022 Continued with the Arithmetic Formatter project and continued with Responsive Web Design.
Sep 13, 2022 Continued with Responsive Web Design.
Sep 12, 2022 Continued with Responsive Web Design.
Sep 11, 2022 Continued with Responsive Web Design.
Sep 10, 2022 Continued with Responsive Web Design.
Sep 09, 2022 Continued with Responsive Web Design.
Sep 08, 2022 Continued with Responsive Web Design.
Sep 07, 2022 Continued with Responsive Web Design.
Sep 06, 2022 Continued with Responsive Web Design.
Sep 05, 2022 Continued with Responsive Web Design.
Sep 04, 2022 Continued with Responsive Web Design.
Sep 03, 2022 Continued with Responsive Web Design.
Sep 02, 2022 Continued with Responsive Web Design.
Sep 01, 2022 Continued with Responsive Web Design.
Aug 31, 2022 Continued with Responsive Web Design.
Aug 30, 2022 Continued with Responsive Web Design.
Aug 29, 2022 Continued with Responsive Web Design.
Aug 28, 2022 Continued with Responsive Web Design.
Aug 27, 2022 Continued with Responsive Web Design.
Aug 26, 2022 Continued with Responsive Web Design.
Aug 25, 2022 Continued with the Arithmetic Formatter project and continued with Responsive Web Design.
Aug 24, 2022 Continued with Responsive Web Design.
Aug 23, 2022 Finished with error handling (?) for the Arithmetic Formatter project and continued with Responsive Web Design.
Aug 22, 2022 Finished with the Scientific Computing with Python lectures. On to the projects!
Aug 21, 2022 Continued with Responsive Web Design.
Aug 20, 2022 Continued with Responsive Web Design.
Aug 19, 2022 Continued with Responsive Web Design.
Aug 18, 2022 Continued with Responsive Web Design.
Aug 17, 2022 Continued with Scientific Computing with Python.
Aug 16, 2022 Continued with Responsive Web Design.
Aug 15, 2022 Continued with Responsive Web Design.
Aug 14, 2022 Continued with Responsive Web Design.
Aug 13, 2022 Continued with Responsive Web Design.
Aug 12, 2022 Continued with Responsive Web Design.
Aug 11, 2022 Continued with Scientific Computing with Python.
Aug 10, 2022 Continued with Scientific Computing with Python.
Aug 09, 2022 Continued with Scientific Computing with Python.
Aug 08, 2022 Continued with Responsive Web Design.
Aug 07, 2022 Continued with Scientific Computing with Python.
Aug 06, 2022 Contunued with Scientific Computing with Python. Nearly done with the videos.
Aug 05, 2022 Contunued with Scientific Computing with Python. Never repeat string data more than once.
Aug 04, 2022 Continued with Scientific Computing with Python.
Aug 03, 2022 Continued with Scientific Computing with Python.
Aug 02, 2022 Continued with Scientific Computing with Python.
Aug 01, 2022 Continued with Scientific Computing with Python.
Jul 31, 2022 Continued with Scientific Computing with Python.
Jul 30, 2022 Continued with Scientific Computing with Python.
Jul 29, 2022 Continued with Scientific Computing with Python. JSON all the way.
Jul 28, 2022 Continued with Scientific Computing with Python.
Jul 27, 2022 Continued with Scientific Computing with Python.
Jul 26, 2022 Continued with Scientific Computing with Python.
Jul 25, 2022 Continued with Responsive Web Design.
Jul 24, 2022 Continued with Scientific Computing with Python. RFC is a nice easter egg.
Jul 23, 2022 Continued with Scientific Computing with Python.
Jul 22, 2022 Continued with Scientific Computing with Python.
Jul 21, 2022 Continued with Scientific Computing with Python.
Jul 20, 2022 Continued with Scientific Computing with Python.
Jul 19, 2022 Continued with Scientific Computing with Python.
Jul 18, 2022 Continued with Scientific Computing with Python.
Jul 17, 2022 Continued with Scientific Computing with Python.
Jul 16, 2022 Continued with Scientific Computing with Python.
Jul 15, 2022 Continued with Scientific Computing with Python.
Jul 14, 2022 Continued with Responsive Web Design.
Jul 13, 2022 Continued with Responsive Web Design.
Jul 12, 2022 Continued with Scientific Computing with Python.
Jul 11, 2022 Continued with Responsive Web Design.
Jul 10, 2022 Continued with Responsive Web Design.
Jul 09, 2022 Continued with Scientific Computing with Python.
Jul 08, 2022 Continued with Scientific Computing with Python.
Jul 07, 2022 Continued with Scientific Computing with Python.
Jul 06, 2022 Continued with Scientific Computing with Python.
Jul 05, 2022 Continued with Scientific Computing with Python. I think the website went down?
Jul 04, 2022 Continued with Scientific Computing with Python.
Jul 03, 2022 Continued with Responsive Web Design.
Jul 02, 2022 Continued with Responsive Web Design.
Jul 01, 2022 Continued with Responsive Web Design.
Jun 30, 2022 Continued with Responsive Web Design.
Jun 29, 2022 Continued with Responsive Web Design.
Jun 28, 2022 Continued with Responsive Web Design.
Jun 27, 2022 Continued with Scientific Computing with Python.
Jun 26, 2022 Continued with Responsive Web Design.
Jun 25, 2022 Continued with Responsive Web Design.
Jun 24, 2022 Continued with Responsive Web Design.
Jun 23, 2022 Continued with Scientific Computing with Python.
Jun 22, 2022 Continued with Scientific Computing with Python.
Jun 21, 2022 Continued with Responsive Web Design.
Jun 20, 2022 Got started with Scientific Computing with Python.
Jun 19, 2022 Finally, finished with the American/British English Translator project (here it is) and finished with Quality Assurance. Oh, and also continued with Responsive Web Design.
Jun 18, 2022 Continued with the translator project (two more test cases left, though I'll be honest and say that I sort of skipped the other two test cases) and with Responsive Web Design.
Jun 17, 2022 Continued with the translator project (four more test cases to go) and with Responsive Web Design.
Jun 16, 202

Table of Contents

Active (before becoming defunct)

Completed

Retroactive

Archive

Navigation Tips

Active (before becoming defunct)

Log

Log

Completed

Summary

Log

Log

Log

Log

Log

Log

Log

Dioptra

Log

Retrospective

Log

Internship @ DPS Sharjah

Retrospective

Log

Ocean Busters

Log

GMAMUN Jr.'24

Summary

Student Council - 12th + Head of Events

Log

AUS CSE Research Assistant

Log

Advent of Code 2023

Log

Gratis 2023

Summary

DXBMUN 2023

Summary

NMSMUN 2023

Summary

Project: Unboxed

Summary

Log

Arjun's AI Escapades Class

RTA Hackathon

Summary

SOLARIS (Third Edition)

Mathematics for Machine Learning

Log

YCM Youth Meet-up

Summary

Machine Learning Safety Course

Summary

SOLARIS (Second Edition)

Log

GFSMUN III

Summary

Local Hackathon 2023

Summary

YGSS 2023

Summary

Log