LeetCode 3: Longest Substring Without Repeating Characters | Sliding Window Explained | Python DSA

Master one of the most frequently asked coding interview questions on LeetCode! In this video, we solve LeetCode 3: Longest Substring Without Repeating Characters using the Sliding Window technique in Python. What you'll learn: Understanding the problem statement Brute force approach and why it's inefficient Sliding Window intuition Step-by-step dry run Python implementation Time & Space Complexity Common interview mistakes Problem Covered 3. Longest Substring Without Repeating Characters Example: Input: "abcabcbb" Output: 3 Key Concepts Sliding Window Two Pointers Hash Set String Manipulation Time Complexity Optimization Time Complexity O(n) Space Complexity O(min(n, character set)) If you found this helpful, don't forget to Like, Share, and Subscribe for more DSA and AI interview preparation videos. #Python #LeetCode #DSA #CodingInterview #SlidingWindow #Algorithms #Programming #SoftwareEngineer #TechInterview #Coding