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Rebuild Tree From Level Order
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Rebuild Tree From Level Order

MediumPython

Problem

Given an array representing level-order traversal, rebuild the original tree structure. Use null for missing children and preserve the input array's positions, including trailing null values, when serializing the rebuilt tree for verification. Implement rebuild_tree(values), which accepts a list of integers or null values and returns the reconstructed tree serialized in the same level-order shape.

Input and Output

The input is a list values. Return a list containing the rebuilt tree's values in level-order, with null placeholders preserved.

Constraints

  • 0 <= len(values) <= 10^4
  • Each non-null value is an integer
  • The first non-null node is the root
  • Every non-null node has a valid non-null parent position

Function Signature

def rebuild_tree(values):
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