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Top View of Binary Tree
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Top View of Binary Tree

MediumPython

Problem

Top View of a Binary Tree

Asked in the Logical and Maintainable Code stage. Given a binary tree, print the top view of the binary tree.

Represent each node as [value, left, right], where a missing child is null. The function receives the root representation and returns a list of visible node values from left to right. Use breadth-first traversal so shallower nodes are considered before deeper nodes. If a right child reaches an already occupied horizontal distance, include it after the regular top-view values in discovery order, as required by the grading contract.

Constraints

  • Each node is represented as [value, left, right] or null
  • 0 <= number of nodes <= 10^4
  • -10^9 <= value <= 10^9
  • The input is a valid binary tree representation

Function Signature

def top_view(root):
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