Update chapTree.tex #30
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Eliminate useless variable. node *pre is totally unused, why leave it there?
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这个变量以前是有用的，后来下面有几句代码注释掉了，就没有用了。 这几行无用的代码，跟preorderTraversal, postorderTraversal 很对称，能后有助于记忆，所以故意多出来放在这里。 |
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Eliminate useless variable.
node *pre is totally unused, why leave it there?