Hard Python Tree Traversal | Dataford Interview Questions

A hard Python tree traversal problem (logic only, not running code). Asked in the Round 2 stage.

Task

Implement vertical_order(root). The input is a binary tree encoded as nested arrays [value, left, right], where a missing child is null. Return node values grouped by vertical column from left to right. Within each column, preserve top-to-bottom order and left-to-right order for nodes on the same level.

Constraints

0 <= number of nodes <= 1,000
Each node is encoded as [value, left, right]
Values are integers
A missing child is represented by null
Return [] when root is null

Function Signature

def vertical_order(root):

Your question is Hard Python Tree Traversal. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

A hard Python tree traversal problem (logic only, not running code). Asked in the Round 2 stage.

Task

Constraints

0 <= number of nodes <= 1,000
Each node is encoded as [value, left, right]
Values are integers
A missing child is represented by null
Return [] when root is null

Function Signature

def vertical_order(root):

Your question is Hard Python Tree Traversal. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.