Binary-Tree-ZigZag-Level-Order-Traversal #52
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Description
Problem No. 103- Leetcode
Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and alternate between).
Approach: Consider 2 stacks for this problem. If level is even-> add the right child of node first and then the left child.
If level is odd-> add the left child first and then its right child. So this makes sure that you access nodes from different sides of tree at each level. For better understanding, check out the implementation.