Master 3Sum (LeetCode 15) in Java | Two Pointer Approach | DSA Interview Prep | MDTech

Welcome to MDTech! 🚀 In this video, we dive deep into **LeetCode Problem 15 – 3Sum**, one of the most popular interview coding questions. We’ll solve it step-by-step in **both Java and JavaScript**, using the efficient **Two Pointer approach** after sorting the array. 💡 What You’ll Learn: • Problem explanation and constraints • Brute force vs optimized O(n²) solution • Handling duplicates efficiently • Full code walkthroughs in Java and JavaScript • Common pitfalls and interview tips Problem link: https://leetcode.com/problems/3sum/ 📘 Related Problems: • LeetCode II – Two Sum - https://www.youtube.com/watch?v=TdBWJV8_zI4 Timestamps: 00:00 Introduction 00:10 Problem statement 01:08 Understanding problem 05:07 Brute force solution explained 11:28 Brute force solution execution in leetcode 16:54 Better solution explained 28:34 Better solution execution in leetcode 34:15 Optimal solution explained 41:45 Optimal solution execution in leetcode 47:00 Wrap up 🎯 This video is perfect for: • Students preparing for FAANG / tech interviews • DSA learners improving problem-solving skills • Developers brushing up on Two Pointer techniques On this channel, you'll find: ✅ Beginner to Advanced DSA Tutorials (Arrays, Linked Lists, Trees, Graphs, Dynamic Programming & more!) ✅ Coding Interview Preparation (Google, Microsoft, Amazon, FAANG & top tech companies) ✅ LeetCode, CodeChef, HackerRank Solutions with in-depth explanations ✅ System Design & Competitive Programming Tips 🎯 Whether you're a beginner starting your DSA journey or a pro sharpening your problem-solving skills, this channel has something for you!🔔 Subscribe now & start your DSA mastery journey today! 📌 Follow us for updates & extra content: 📱Instagram: https://www.instagram.com/maheshrd999/ 🌐 LinkedIn: https://www.linkedin.com/in/mahesh-dharwad-b4839267/ #LeetCode #LeetCode15 #3Sum #DSA #CodingInterview #Java #JavaScript #TwoPointer #Algorithm #ProblemSolving #MDTech #LeetCodeSolutions #InterviewPreparation