Binary Tree Zigzag Level Order Traversal
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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).
For example: Given binary tree 3,9,20,#,#,15,7,
3
/ \
9 20
/ \
15 7
return its zigzag level order traversal as:
[
[3],
[20,9],
[15,7]
]
题意：
层序遍历的变形。螺旋遍历
0 0
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