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Build a hash map, make it thread-safe, and review a producer-consumer queue

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MicrosoftCodingLast asked Apr 2026

Implement a hash map from scratch: hashing, buckets, collisions, resizing and the edge cases (null keys, rehashing while iterating). Then make it safe for many threads and discuss lock striping versus one lock. A related exercise in the same loop asks you to review and debug producer-consumer message queue code.

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