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Minimum Window Substring
Minimum Window Substring is the sliding window pattern: grow, shrink, and maintain just enough state to stay linear. It's a hard one for a reason: it stresses stateful scanning when the rules pile up. Once your window update rules are consistent, you get linear time almost for free.
Learn this pattern
Sliding Window Algorithm
Sliding window processes arrays or strings by moving a window through the data, updating results incrementally instead of recalculating from scratch. Reach for it when you see "contiguous subarray," "longest/shortest substring," or "at most K distinct."
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