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Two Pointers Approach

Two Pointers Approach

Efficiency is crucial when it comes to solving algorithmic problems.

7 min read
String Compression

String Compression

Given an array of characters chars, compress it using the following algorithm:

17 min read
Validate Binary Search Tree

Validate Binary Search Tree

Given the root of a binary tree, determine if it is a valid binary search tree (BST).

23 min read
Subarray Sum Equals K

Subarray Sum Equals K

Given an array of integers nums and an integer k, return the total number of subarrays whose sum equals...

14 min read
Squares of a Sorted Array

Squares of a Sorted Array

Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in non-decreasing order....

12 min read
Check If N and Its Double Exist

Check If N and Its Double Exist

Given an array arr of integers, check if there exist two indices i and j such that :

10 min read
Remove Element

Remove Element

Given an integer array nums and an integer val, remove all occurrences of val in nums in-place. The relative order of the...

15 min read
Merge Sorted Array

Merge Sorted Array

You are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number...

12 min read