Array

Maximum Difference Between Even and Odd Frequency 1

Is Subsequence

Learn how to check if one string is a subsequence of another using two pointers, recursion, and memoization. Efficient C++ solutions with dry runs and complexity analysis included.

Squares of a Sorted Array

Learn how to efficiently square and sort a non-decreasing integer array using a two-pointer technique. This optimal solution runs in O(n) time with O(1) extra space, making it perfect for handling large datasets smoothly.

Remove Duplicates from Sorted Array 2

Partition Array Into Three Parts With Equal Sum

Find Pivot Index

Subarray Sums Divisible by K

Range Sum Query 2D - Immutable

Range Sum Query - Immutable

Number of Laser Beams in a Bank

Game of Life