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Grokking the Coding Interview Patterns in Python

Binary Tree Level Order Traversal

Explore how to implement a level order traversal of a binary tree using breadth-first search. Understand how to visit each node level by level and return the values as a formatted string. This lesson teaches you to handle empty trees and ensures you grasp the traversal logic for efficient tree processing.

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Statement

Given the root of a binary tree, display the values of its nodes while performing a level order traversal. Return the node values for all levels in a string separated by the character :. If the tree is empty, i.e., the number of nodes is 00, then return “None” as the output.

Constraints:

  • The number of nodes in the tree is in the range ...