🎲 PUZZLES 🎲

🎯 Longest string

In an 2D array of integers, find the longest string of consecutive integers without backtracking (only lateral movements allowed, diagonals not allowed).

🎯 Sudoku

Find a solution to a Sudoku board. More on Sudoku.

🎯 Add two numbers

Add two numbers (leetcode).

🎯 Longest substring without repeating characters

Longest substring without repeating characters (leetcode)

🎯 Merge without extra space

Merge without extra space (GeeksForGeeks)

🎯 Zigzag conversion

Zigzag conversion (leetcode)

🎯 Remove duplicates

Remove duplicates (leetcode)

🎯 Longest palindromic substring

Longest palindromic substring (leetcode)