http://acm.hdu.edu.cn/showproblem.php?pid=2065
参考1:https://blog.youkuaiyun.com/funklayer/article/details/79326876
参考2:https://blog.youkuaiyun.com/wongson/article/details/4029863#commentBox
#include <iostream>
using namespace std;
int main()
{
int t