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Quick Summary
Simulate day-by-day removal of all current leaf nodes from an N-ary tree.
Nodes that become leaves after previous removals are removed in subsequent iterations.
Return a nested list grouping node values by the day they are removed.
What This Tests
Tree traversal and recursive decomposition
Bottom-up dynamic programming on trees
Level or depth assignment from leaves to root
Handling variable-degree graph structures
Common Patterns
DFS/BFS
Dynamic Programming
Graph Traversal
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