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Quick Summary

Calculate the daily peak concurrency of phone calls for each customer.
Handle calls that span multiple days and respect exclusive end timestamps.
Identify the earliest timestamp of maximum concurrency and list active call IDs.

What This Tests

Interval processing and event-driven timeline analysis
Hash-based grouping by composite keys
Event sorting with precise tie-breaking rules
Dynamic set tracking for active state management

Common Patterns

Sorting

Hashing

Stdout

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