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HLD: degrees of separation between two users at billion-user scale
Tests whether you reach for bidirectional BFS over a sharded adjacency-list graph store to collapse search depth, rather than a naive single-direction BFS that explodes exponentially at scale.
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Generate a complete, structured system design answer — requirements, capacity estimation, API design, architecture, database choice, scaling, caching, fault tolerance, security, trade-offs, and more, walked through the way a strong senior engineer would in a real interview.
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