去除文件中的重复行。 先将文件内容读入一buffer,按行拆分，每行数据只取\t之前的部分。然后用二分直接插入法将不重复的字符串放入一二维数组。-Remove duplicate rows from the file. Content of the document read into a first buffer, split by row, each row of data just take \ t the previous section. Then two minutes dire