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https://spground.github.io/2018/01/27/Morris%20binary-tree%20traverse/
中序遍历伪代码第5行应该是
while pre.right != NULL && pre.right != cur://找到前驱结点pre
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https://spground.github.io/2018/01/27/Morris%20binary-tree%20traverse/
中序遍历伪代码第5行应该是
while pre.right != NULL && pre.right != cur://找到前驱结点pre