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Solution: Binary Tree Zigzag Level Order Traversal

Explore the zigzag level order traversal of binary trees by using a deque in a breadth-first search approach. Understand how to alternate processing directions at each level and implement efficient traversal that switches between left-to-right and right-to-left order, solving the problem with O(n) time and space complexity.

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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 ...