Parallelize the lock BFS safely
SnapchatSoftware Engineer · Technical Screen
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Parallelize the lock BFS safely evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Follow-up: If multiple threads are available, how would you parallelize the BFS for the rotating-lock problem? Describe how to partition work across threads, maintain BFS level ordering if required, implement a thread-safe visited set and queues, prevent duplicate exploration, and evaluate trade-offs such as contention, memory overhead, and determinism.
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