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Quick Summary
Manage credit grants that span time intervals and support point-in-time deductions.
Handle out-of-order event processing while maintaining accurate cumulative balances.
Return -1 if requested deductions exceed available credits at a specific timestamp.
What This Tests
Interval management and timeline aggregation
Hash map data structures for fast lookups
Difference arrays and prefix sum techniques
Decoupling stateful updates from instantaneous queries
Common Patterns
Prefix Sum
Hashing
Sorting
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