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11:57
YouTube
BitSize Learning
Why This 26-Slot Array Instantly Solves LeetCode 567
LeetCode 567 (Permutation in String) is a classic sliding window problem — but the real trick is understanding the invariant, not memorizing the code. In this video, I explain the clean diff[26] sliding window approach using micro-step updates, showing exactly why matches == 26 guarantees a permutation. We build diff = window(s2) − s1 ...
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