🔍 Problem:
Given a string s, return the length of the longest substring that does not contain duplicate characters.
🔥 In this video, we solve Longest Substring Without Repeating Characters using 3 approaches:
✅ Brute Force (O(n²)) – Try all substrings (inefficient 🚫).
✅ Sliding Window / Two-Pointer (O(n)) – Dynamically expand & shrink the window.
✅ Optimized Sliding Window (O(n)) – Use a HashSet for efficient lookups.
📌 Links
🔗 Problem: https://leetcode.com/problems/longest-substring-without-repeating-characters/description/
🔗 Solution Submission: https://leetcode.com/problems/longest-substring-without-repeating-characters/submissions/1590603944/
📌 Timestamps:
⏳ 00:00 - Introduction
📖 00:30 - Problem Explanation
🔍 02:45 - Brute Force Approach (O(n²))
🔍 07:20 - Two-Pointer / Sliding Window (O(n))
⚡ 18:50 - Optimized Sliding Window (O(n))
🚀 25:00 - Coding Implementation
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