Grokking Meta Coding Interview
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Solution: Binary Tree Vertical Order Traversal
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Problem Statement

Given the root of the binary tree, return the 2D list containing the vertical order traversal of the binary tree.

A vertical order traversal of the tree is defined as a top to bottom, column by column traversal.

Note: If two nodes are in the same row and column, keep its order from left to right.

Examples

Example 1:

  • Input: A binary tree: [1,2,3,4,5,6,7]
  • Expected Output: [[4], [2], [1,5,6], [3], [7]]
  • Justification: Nodes 4, 2, 1 with 5 and 6, 3, and 7 are in separate vertical lines

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