http://acm.buaa.edu.cn/contest/195/problem/H-%E9%9A%BE%E9%A2%98(10)/
无法访问你给的链接。。。
](http://acm.buaa.edu.cn/contest/195/problem/H-%E9%9A%BE%E9%A2%98(10)/!%5B%E5%9B%BE%E7%89%87%5D(https://img-ask.csdn.net/upload/201506/21/1434818441_289810.png)){kind=link}