Intuition We aim to find the maximum sum of a subarray whose length is divisible by k. Instead of examining all possible subarrays, which would be inefficient, we employ a snake-like sliding trick. This involves moving forward one step at a time, kee...

Imagine going through a list once and solving a problem that would otherwise need nested loops and a prayer. That’s the magic of Two Pointers and Sliding Windows — algorithms that give you O(n) time for problems that feel like they should be O(n²). I...

You are given a string S, and your task is to find all the amazing substrings within S. An amazing substring is defined as any substring that begins with a vowel. The vowels considered for this task include both lowercase and uppercase letters: a, e,...
