3. Longest Substring Without Repeating Characters | Leetcode Unlocked - Python
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Master the Sliding Window technique with this deep dive into LeetCode's 'Longest Substring Without Repeating Characters' problem (LeetCode 3)! This is one of the most classic and fundamental problems for coding interviews.
In this video, we break down the problem step-by-step. We start by understanding the difference between a substring and a subsequence, then explore why a brute-force approach is too slow. The main focus is on the elegant and efficient Sliding Window algorithm. I'll show you how to use two pointers (left and right) and a Hash Set to find the solution in optimal O(N) time.
We'll walk through a detailed code implementation in Python, and then provide the full, working solutions in Java, C++, and JavaScript so you can see how the core logic applies across different languages.
Perfect for coding interview preparation and improving problem-solving skills.
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Solution Link:
https://leetcode.com/problems/longest...
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#leetcode #python #algorithms #codinginterview #problem_solving