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Grokking the Coding Interview Patterns in Go

Solution: Vertical Order Traversal of a Binary Tree

Explore how to implement vertical order traversal of a binary tree using breadth-first search. Learn to assign column indices, maintain node order by level and column, and optimize traversal with hash maps and queues. This lesson helps you understand the approach to traverse nodes top to bottom and left to right efficiently, including considerations of time and space complexity.

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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 ...