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Quick Summary

Validate transactions by verifying both accounts exist and the sender has sufficient balance.
Aggregate valid transaction counts per sender account in a single pass.
Return the top 10 senders sorted by count descending, with ties broken by account ID ascending.

What This Tests

Hash table lookups for O(1) data retrieval
Conditional filtering and data aggregation
Custom multi-key sorting
String-to-integer parsing and comparison

Common Patterns

Hashing

Sorting

Test Cases

Input

Output

Expected