Leetcode103_Binary-tree-zigzag-level-order-traversal

原题：

https://leetcode-cn.com/problems/binary-tree-zigzag-level-order-traversal/

 

思路，如果无从下手，先要了解二叉树的广度优先遍历 BSF :

https://www.cnblogs.com/Jomini/p/12032020.html

 

参考答案:

https://blog.csdn.net/qq_39313597/article/details/89669927