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Quick Summary

Group participants by country and aggregate their available dates.
For each country, find the date with the highest number of overlapping attendees.
Break ties by selecting the earliest chronological date and return the final schedule.

What This Tests

Nested data aggregation and grouping
Frequency counting and max-finding logic
String-based date comparison and ordering
Efficient hash map usage for multi-key indexing

Common Patterns

Hashing

Sorting

Stdout

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