题目
题目描述
请实现一个函数，用来判断一棵二叉树是不是对称的。如果一棵二叉树和它的镜像一样，那么它是对称的。
例如，二叉树 [1,2,2,3,4,4,3] 是对称的。
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但是下面这个 [1,2,2,null,3,null,3] 则不是镜像对称的:
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A Master of Chongqing University A Computer Vision Practicer Keep Moving
