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Quick Summary
Track user follow relationships over time using versioned edge histories.
Capture current state efficiently via incrementing snapshot IDs.
Query historical state by finding the most recent relevant update before a given snapshot ID.
What This Tests
Temporal data structures and version control concepts
Efficient mutation and query design using hash maps
Binary search for historical state retrieval
Optimizing space complexity by avoiding full graph copies
Common Patterns
Hashing
Binary Search
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