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Learn how to solve LeetCode 3: Longest Substring Without Repeating Characters in Python the easy way! We’ll use a sliding window trick with a set to track unique characters—clean, fast, and beginner-friendly Examples: Input: "abcabcbb" → Output: 3 Input: "bbbbb" → Output: 1 Input: "pwwkew" → Output: 3 Perfect for daily coding practice ...
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