🔥 LeetCode 4Sum Problem | Two Pointer + Nested Loop Explained Step-by-Step
Problem Link: https://leetcode.com/problems/4sum/
In this video, we solve the LeetCode 4Sum problem using an optimized Two Pointer technique combined with smart nested loops to find all unique quadruplets that sum to a given target.
✅ What you’ll learn in this video:
🔹 How the Two Pointer technique works for 4Sum
🔹 Why sorting is necessary before applying the algorithm
🔹 Full step-by-step walkthrough of the logic
🔹 How to efficiently skip duplicates
🔹 Time complexity discussion
🔹 Common mistakes to avoid while coding 4Sum
This tutorial focuses on making the logic simple and interview-ready. You will clearly understand how indices i, j, left, and right work together to generate unique quadruplets.
Perfect for:
🎯 DSA beginners
🎯 LeetCode problem solvers
🎯 Coding interview preparation
🎯 Students struggling with Two Pointer concepts
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