Search⌘ K
AI Features
Home
Courses
Grokking the Coding Interview Patterns in C++

Solution: Vertical Order Traversal of a Binary Tree

Explore the vertical order traversal of a binary tree by applying breadth-first search techniques. Understand how to visit nodes level by level, use a hash map to group nodes by their column indices, and return node values from left to right and top to bottom. This lesson helps you solve the problem efficiently with an O(n) time complexity.

We'll cover the following...

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 ...