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Solution: Vertical Order Traversal of a Binary Tree

Explore how to solve the vertical order traversal problem for binary trees by using breadth-first search. Understand the algorithm steps, including maintaining column indexes and a hash map to collect nodes. Learn to optimize traversal by processing nodes level by level, and grasp the time and space complexities involved.

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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 ...