Add Zig Zag Traversal Binary Tree #173
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Zig Zag Traversal: Given the root of a binary tree, returns the zigzag level order traversal of its nodes' values. (i.e., from left to right, then right to left for the next level and alternate between).
Input: root = [3,9,20,null,null,15,7]
Output: [ [3], [20,9], [15,7] ]