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Quick Summary
Match incoming transactions to previously stored loans using user ID, exact amount, and a resolved top-level company.
Merchant strings must be mapped to their root companies via hierarchical relationships.
Requires efficient indexing and caching to support fast, read-only lookups across sequential method calls.
What This Tests
Hash-based indexing and composite key design
Hierarchical data resolution and path caching
Stateful object behavior across multiple invocations
Efficient lookup strategies under uniqueness guarantees
Common Patterns
Hashing
Union Find
Graph Traversal
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