Understanding absolute values in expression parsing to binary tree?

了解表达式的解析树的绝对值？

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The concepts such as mathematical expression, stack operation and binary tree traversal must be presented in data structure.

数学表达式、栈的操作、二又树的遍历，这几个概念在数据结构的教材中是不可缺少的。

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First, classic string matching algorithms and regular expression matching algorithms are studied; second a binary sort tree string matching algorithm is proposed and realized.

终结符号处理过程中，深入地研究了字符串匹配算法和正则表达式匹配算法，并实现了二叉排序树字符串匹配算法。

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First, classic string matching algorithms and regular expression matching algorithms are studied; second a binary sort tree string matching algorithm is proposed and realized.

终结符号处理过程中，深入地研究了字符串匹配算法和正则表达式匹配算法，并实现了二叉排序树字符串匹配算法。

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