Binary Tree Vertical Order Traversal

Understand and solve the interview question "Binary Tree Vertical Order Traversal".

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The goal is to find the binary tree vertical order traversal of the binary tree when the root of this binary tree is given. In other words, you have to 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. Let’s go over some examples:

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