数据结构，低频词过滤
基于线性表和二叉排序树的低频词过滤系统
对于一篇给定的英文文章，分别利用线性表和二叉排序树来实现单词频率的统计，实现低频词的过滤，并比较两种方法的效率。
(1) 读取英文文章文件（InFile.txt），识别其中的单词。
(2) 分别利用线性表和二叉排序树构建单词的存储结构。当识别出一个单词后，若线性表或者二叉排序树中没有该单词，
则在适当的位置上添加该单词；若该单词已经被识别，则增加其出现的频率。
(3) 统计结束后，删除出现频率低于五次的单词，并显示该单词和其出现频率。
(4) 其余单词及其出现频率按照从高到低的次序输出到文件中（OutFile.txt），同时输出用两种方法完成该工作所用的时间。
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