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注意Symmetric Binary Tree的例子和定义: 是镜面一样的对称. 并不是说左右两个sub-tree相等。 - stack1: 左手边sub-tree先加left, 再加right child; - stack2: 右手边sub-tree先加right child, 再加left child。 - process时,若symmetric,所有stack里面出来的node ...
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