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Quick Summary
Design a system to store pins with unique IDs, scores, and categories.
Prevent duplicate entries while efficiently grouping pins by their category.
Retrieve the top K highest-scoring IDs for a specified category without altering the underlying data structure.
What This Tests
Hash table usage for grouping and duplicate detection
Heap / Priority Queue operations for dynamic ranking
State preservation during temporary data extraction
Time and space complexity tradeoffs in data structure design
Common Patterns
Heap / Priority Queue
Hashing
Sorting
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