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Databricks
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Quick Summary
Traverse a hierarchical directory tree to aggregate file counts.
Distinguish between encrypted and unencrypted files at each node.
Return a two-element array representing totals across the entire subtree.
What This Tests
Tree traversal and recursive state accumulation
Handling nested collections and custom objects
Post-order computation for subtree aggregation
Space and time complexity awareness
Common Patterns
DFS/BFS
Divide and Conquer
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