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Quick Summary
Maintain a dynamic registry of customers with unique IDs and evolving total revenue.
Process direct registrations and referral-based registrations where referrers earn credit from referred earnings.
Query the system for the top K customers whose total revenue meets a specified threshold.
What This Tests
Dynamic state management with frequent value updates
Efficient ordering and retrieval using priority structures
Hash map usage for constant-time ID and record access
Filtering and ranking logic under time constraints
Common Patterns
Heap / Priority Queue
Hashing
Sorting
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