Unlike other self-balancing binary search trees that provide worst case O(log n) lookup time, scapegoat trees have no additional per-node overhead compared to a regular binary search tree.

和其它的提供了最坏情况O（log n） 查找时间的自平衡二分查找树不同，替罪羊树与普通的二分查找树相比，并没有对每个节点增加额外的开销。

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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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