dsa1 min read
Backspace String Compare — Two Pointer O(1) Space
Compare two strings after applying backspace characters in O(1) space by scanning from right with skip counters.
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Crawler Log Folder — Stack Depth Counter
Track the minimum number of operations to return to the main folder by simulating directory navigation with a depth counter.
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Number of Recent Calls — Sliding Window Queue
Count ping requests within the last 3000ms using a queue that slides expired entries off the front.
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Make the String Great — Stack Same-Letter Case Check
Remove adjacent pairs of same letters with different cases using a stack to build the result character by character.
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Daily Temperatures — Monotonic Decreasing Stack
Find how many days until a warmer temperature using a monotonic decreasing stack of unresolved day indices.
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