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Quick Summary
Simulate participant progression through sequential rooms in a game environment.
Track real-time room populations and rank players by progress and entry order.
Design efficient data structures to handle frequent updates and top-k queries.
What This Tests
Priority Queue customization and multi-key tie-breaking
Hash Map state management for O(1) lookups
Array-based frequency counting
Trade-offs between update and query complexity
Common Patterns
Heap / Priority Queue
Hashing
Sorting
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