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Grokking the Coding Interview Patterns in C++

Solution: Vertical Order Traversal of a Binary Tree

Explore how to implement vertical order traversal of a binary tree using a breadth-first search approach. This lesson helps you understand how to organize nodes by their column indices from top to bottom, left to right. You will learn to manage data structures like hash maps and queues to optimize traversal, and evaluate the solution's time and space complexities for efficient coding.

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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 ...