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Quick Summary
Implement an in-memory key-value store supporting insertion, retrieval, and deletion operations.
Handle string-based keys and values with efficient average-case constant-time operations.
Return a specific sentinel value when attempting to access non-existent keys.
What This Tests
Hash table mechanics and native language implementations
Object-oriented class design and method signatures
Time and space complexity evaluation
Edge case handling for missing keys and overwrites
Common Patterns
Hashing
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