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Largest Local Values in a Matrix
Largest Local Values in a Matrix is a classic scan-and-record problem: the right bookkeeping beats brute force. It's a great warm-up that builds data-structure instincts without a ton of moving parts. The classic trap is mishandling duplicates or overwriting useful information too early.
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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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Arrays and Hashing Interview Questions gives you a useful next rep while you are still on your phone.