3Sum SOLVED! Two Pointer + Duplicate Logic Explained (Hindi+JavaScript) | 50 LeetCode Challenge (21)

My Udemy Course on JavaScript Logic Building and Coding Practice in English:
https://www.udemy.com/course/javascri...

Welcome to Video 21 of my series: 50 LeetCode Challenges in JavaScript (Hindi).
In this series, we solve LeetCode problems from Easy to Medium to Hard with clear Hindi explanations and clean JavaScript solutions.

Today’s challenge is 3Sum.
This is a classic array and two-pointer interview problem where you must find all unique triplets whose sum is zero.

In this video, you will learn:
Why sorting is required before using two pointers
How the left and right pointers work together
How to avoid duplicate triplets correctly
How to handle edge cases cleanly
Optimized O(n²) solution explained step by step
Interview-ready JavaScript implementation

Who this video is for:
JavaScript beginners
Students preparing for coding interviews
Anyone practicing LeetCode problems
Learners who want clear explanations in Hindi

Challenge in this video:
3Sum Medium

LeetCode Problem Link:
https://leetcode.com/problems/3sum/

Code Solution for this challenge:
https://github.com/ashsal/javascript-...

My YouTube Course on JavaScript Logic Building and Coding Practice in Hindi:
   • Javascript JS Coding Practice 1 - From Bas...  

My JavaScript Course on YouTube:
   • Learn Javascript in Hindi  

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