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Solution: Vertical Order Traversal of a Binary Tree

Explore how to implement vertical order traversal of a binary tree using breadth-first search. Understand how to organize nodes column by column, maintaining correct order for nodes on the same level and column. Learn to efficiently use a hash map and queue to achieve an optimal O(n) time and space complexity solution suitable for coding interviews.

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Statement

Find the vertical order traversal of a binary tree when the root of the binary tree is given. In other words, return the values of the nodes from top to bottom in each column, column by column from left to right. If there is more than one node in the same column and row, return the values from left to right.

Constraints:

  • The number of nodes in the tree is in the range [1, 500].
  • 0≤0 \leq Node.data ≤1000\leq 1000

Solution

So far, you’ve probably brainstormed some approaches and have an idea of how to solve this problem. Let’s explore some of these ...