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Quick Summary
Match spam reports to incoming calls based on receiver identity and a strict time window.
Assign each report to the chronologically closest eligible call with deterministic tie-breaking.
Aggregate matched caller frequencies and return formatted result strings.
What This Tests
Timestamp parsing and time arithmetic
Hash map grouping and efficient lookups
Greedy matching with tie-breaking rules
Leveraging pre-sorted input properties
Common Patterns
Hashing
Greedy
Sorting
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