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Maximum Subarray
Maximum Subarray is about turning repeated work into a reusable state instead of re-solving subproblems. Interviewers love it because it reveals your state-and-transition thinking and your edge-case discipline. Once you define the right state, the transitions usually write themselves.
Learn this pattern
Arrays and Hashing Interview Questions
Arrays and hashing problems are about fast lookup choices: set for membership, map for attached state, and buckets when counts are bounded. Reach for this family when brute force compares too many pairs or when you need to remember what you saw earlier in one pass.
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