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Quick Summary
Represent a forest where each node stores its direct parent index.
Remove a specified node along with all of its descendants.
Mark deleted entries as -1 in-place without shifting remaining indices.
What This Tests
Tree and graph traversal strategies
Transforming parent-pointer arrays into child-adjacency structures
In-place data modification and array indexing
Iterative versus recursive depth-first exploration
Common Patterns
Graph Traversal
DFS/BFS
Hashing
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Hint 1
Hint 2
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Input
parentIndex =
target =
Output
Expected
