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Simulate a credit management system where grant and usage events arrive out of chronological order.
Query the total balance at a specific time by replaying all known events in strict timeline order.
Deduct credits from active grants using a greedy strategy that prioritizes soonest-expiring credits.
What This Tests
Event simulation and chronological processing
Priority queue management for interval scheduling
State tracking under asynchronous inputs
Greedy allocation strategies
Common Patterns
Heap / Priority Queue
Sorting
Hashing
Greedy
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