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Quick Summary
Remove specific nodes from an N-ary tree based on a provided list of values.
Promote the children of removed nodes to become direct children of the removed nodes' parents.
Handle potential cascading removals where a grandchild might need to bypass multiple compressed ancestors.
What This Tests
Recursive DFS traversal and post-order processing
In-place modification of tree structures
Using HashSet for efficient O(1) lookups
Dynamic list manipulation during tree traversal
Common Patterns
DFS/BFS
Hashing
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