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DoorDash
Coding Question
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Quick Summary
Compare two n-ary menu trees to count modified nodes.
Track changes in node values and active status.
Treat absent nodes and their entire subtrees as inactive during structural updates.
What This Tests
Tree traversal and recursion
Hash-based data structure lookups
State comparison and diffing logic
Handling edge cases in hierarchical data structures
Common Patterns
DFS/BFS
Hashing
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