15. 3Sum | Leetcode Blind 75 | Java Solution (Two Pointers) скачать в хорошем качестве

15. 3Sum | Leetcode Blind 75 | Java Solution (Two Pointers)

Master the "3Sum" problem (LeetCode 15) – A quintessential array problem for coding interviews!In this video, we tackle the famous 3Sum problem from the Blind 75 list. Finding three numbers that add up to zero can be tricky, especially when dealing with duplicate triplets. I’ll walk you through why the Brute Force approach (O(n^3)) is too slow and how we can optimize it to O(n^2) by sorting the array and applying a modified Two Sum (Two Pointers) technique. 👨‍💻 What We Cover: The Problem: Finding unique triplets that sum to zero. Brute Force Approach: Why three nested loops (O(n^3)) will lead to a Time Limit Exceeded (TLE) error. Optimal Approach: Sorting the array and reducing the problem to Two Sum using the Two Pointers method. Handling Duplicates: The crucial logic to skip duplicate elements and avoid duplicate triplets in your final result. Java Implementation: A clean, step-by-step code walkthrough. ⏱️ Timestamps:0:00 - 0:00 Introduction & Problem Statement 2:50 - Brute Force Solution ($O(n^3)$) 8:07 - Intuition for the Optimized Approach 16:20 - Using Two Sum (Two Pointers) Logic 💡 Key Concepts: Arrays & Two Pointers SortingTime Complexity: O(n^2) Space Complexity: $O(1)$ or $O(n)$ depending on the sorting algorithm Useful Links:LeetCode Problem: https://leetcode.com/problems/3sum/de... 👋 Connect With Me: Channel: ‪@buildwithjaswinder‬ LinkedIn:   / jaswinder-singh-virk-90b668128   Hashtags:#leetcode #3Sum #blind75 #javaprogramming #java #codinginterview #fang #faangpreparation #buildwithjaswinder #twopointers #softwareengineering #datastructures #faangpreparation #alogorithm #programming #codinginterview #coding #codingforbeginners #codingforbeginners #datastructuresandalgorithms #javaprogramming #java #education #computer