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Quick Summary
Construct a company hierarchy from direct parent-child pairs.
Route each incoming loan to its ultimate owning company by following parent links.
Maintain and return dynamic aggregations of loan IDs per top-level entity.
What This Tests
Hash map usage for relationship storage and aggregation
Tree/graph navigation and path resolution
Stateful data structure design
Memoization and path compression techniques
Common Patterns
Hashing
Graph Traversal
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