一个算法小程序：读入一个包含若干个单词的数据文件，统计每个单词出现次数并且按照单词的升序顺序打印，扎到源文件中的重复单词，并每隔一个删除一个重复单词-A algorithm small program: read a contains several words data files, statistics each word number according to the words and in ascending order print, firm in the source file t