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Grokking the Coding Interview Patterns in C++

Solution: Binary Tree Zigzag Level Order Traversal

Explore how to implement a zigzag level order traversal of a binary tree using a deque to alternate traversal direction on each level. Understand how to manage nodes efficiently to process left-to-right and right-to-left levels, improving your skills in tree traversal algorithms and breadth-first search techniques.

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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 ...