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Rotting Oranges
This is really about exploring a state space without revisiting the same work. Interviewers love it because it reveals your traversal modeling and your edge-case discipline. The trap is revisiting states or missing a base case; your visited/queue logic needs to be tight.
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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