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Grokking the Coding Interview Patterns in Python

Solution: Binary Tree Zigzag Level Order Traversal

Explore how to implement a zigzag level order traversal for a binary tree by using a deque to alternate between left-to-right and right-to-left traversal at each level. Understand the use of a reverse flag to switch directions and efficiently process nodes in O(n) time and space.

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Statement

Given a binary tree, return its zigzag level order traversal. The zigzag level order traversal corresponds to traversing nodes from left to right for one level, right to left for the next level, and so on, reversing the direction after every level.

Constraints:

  • The number of nodes in the tree is in the range 00 to 500500 ...