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Simulate a redemption system by processing events strictly in their input order.
Track per-user redemption counts for each offer based on active time ranges and action types.
Filter and output redeemable offers for every distinct user appearing in the event log.
What This Tests
Event-driven state simulation
Hash map indexing and composite key management
Conditional filtering with temporal constraints
Strict output ordering and grouping requirements
Common Patterns
Simulation
Hashing
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