Day 16 of #30DaysOfLeetCode Problem 3: Longest Substring Without Repeating Characters This problem helped me understand the sliding window technique and how to efficiently handle duplicate characters ...
🔥 This is a perfect “pre-flight checklist” before diving into advanced algorithms. HashMaps, recursion, DFS/BFS, binary search, sliding window, heaps — master these, and a lot of interview problems ...
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