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Kth Largest Element in an Array
Binary search is the tool here, but the real test is whether your invariant stays crisp. Interviewers love it because it reveals your boundary precision and your edge-case discipline. If you can state the invariant for your search space, you'll stop making off-by-one mistakes.
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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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