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【leetcode】Q101对称二叉树 #4

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@0xbitboy

leetcode:Q101
给定一个二叉树,检查它是否是镜像对称的。

例如,二叉树 [1,2,2,3,4,4,3] 是对称的。

    1
   / \
  2   2
 / \ / \
3  4 4  3

但是下面这个 [1,2,2,null,3,null,3] 则不是镜像对称的:

    1
   / \
  2   2
   \   \
   3    3

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