Find spammer with minimal hasMessaged calls

Q: Find spammer with minimal hasMessaged calls

This is a Coding & Algorithms interview question from HubSpot for Software Engineer roles. View the full question and solution on PracHub.

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Question

You have n accounts labeled 0..n-1 and an oracle hasMessaged(a, b) that returns true if account a has sent at least one message to account b. Define a "spammer" as an account that has messaged every other account and has received messages from none. Find the spammer if one exists using O(n) oracle calls and O(

extra space; otherwise return -1. Provide the algorithm, prove correctness, analyze time/space complexity, and discuss edge cases (n in {0,1}, multiple candidates, and self-messages).

Find spammer with minimal hasMessaged calls

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