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Quick Summary
Design a key-value store that maintains a chronological timeline of updates for each key.
Support querying historical states at specific timestamps while correctly handling deletion markers.
Ensure all mutation operations respect strictly increasing timestamps and perform efficiently.
What This Tests
Hash table design and data organization
Ordered collections and efficient range queries
State management and temporal logic
Handling edge cases like deletions and missing keys
Common Patterns
Hashing
Binary Search
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