相似性

https://mp.weixin.qq.com/s/EGpjUVdjJlEjYbdbjbpR7A

https://files-cdn.cnblogs.com/files/hdu-2010/%E5%A4%8D%E6%9D%82%E7%BD%91%E7%BB%9C%E4%B8%AD%E7%9A%84%E8%8A%82%E7%82%B9%E7%9B%B8%E4%BC%BC%E6%80%A7.zip