输入一个文件名（英文文件），使用二叉树整理这个文件内的所有单词，并可以按字母顺序输出所有出现的字母及其出现次数，统计出现次数最多的10个单词-Enter a file name (English documents), using binary collation of all words within the file, and can output all appear in alphabetical order of the letters and the number of occurr

高考英语单词出现频率统计，将历年英语单词统计汇总，得到高考英语单词的出现频率。对学生是个重要的参考。-College English word frequency statistics, the calendar year English word statistics summary, get the college entrance examination English words frequency. The students is an important reference.