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Quick Summary
Locate a specific file or directory node in a tree-structured virtual file system by name.
Calculate the cumulative size of all files contained within the target node's subtree.
Handle both direct file lookups and nested directory aggregations efficiently.
What This Tests
Tree traversal and navigation techniques
Iterative versus recursive algorithm design
Subtree aggregation and state accumulation
Polymorphic object hierarchy handling
Common Patterns
DFS/BFS
Graph Traversal
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