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Quick Summary
Manage worker profiles and track office entry/exit events via monotonic timestamps.
Calculate total worked duration by accumulating only completed visit intervals.
Enforce unique worker IDs and return specific status codes for invalid operations.
What This Tests
Hash map design for O(1) state retrieval and updates
Object-oriented modeling and data encapsulation
State tracking logic for entry/exit cycles
Input validation and precise return type handling
Common Patterns
Hashing
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