文件里有三个研一组合数学中的算法，有排列、中介数、求下一个排列算法。用C++写的，为了下载方便，我将其放在记事本里了。-There are three research papers a combination of mathematical algorithms, have arranged a number of intermediaries, and with the next algorithm. Using C++ to write and easy to download, I will put it in a notebook.