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 occurrences, the statistics appear most frequently 10 words