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Grokking the Coding Interview Patterns in JavaScript

Solution: Binary Tree Zigzag Level Order Traversal

Understand how to perform zigzag level order traversal on a binary tree by alternating the traversal direction at each level using a deque. Learn to efficiently manage nodes and apply BFS to return the tree levels in a zigzag order.

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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 ...