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Quick Summary
Process a chronological sequence of API calls to manage users, friendships, and transactions.
Maintain real-time state using hash maps and sets for balances, pending requests, and connections.
Apply conditional transfer rules based on friendship status and account funds, then output final balances.
What This Tests
Hash table usage for O(1) lookups and updates
Sequential state simulation
String tokenization and parsing
Constraint validation logic
Common Patterns
Hashing
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