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Quick Summary
Match incoming spam reports to historical calls based on receiver identity and a strict time window.
Resolve ties by selecting the chronologically closest call, breaking further ties with original input order.
Aggregate results to return a frequency count of matched callers.
What This Tests
Hash map grouping and efficient lookups
Timestamp string parsing and numeric comparison
Greedy matching with deterministic tie-breaking
Data aggregation and formatted output generation
Common Patterns
Hashing
Greedy
Two Pointers
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