#include <iostream>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <time.h>
using namespace std;
int main()
{
clock_t start,finish;
start=clock();
//这里写测试代码
finish=clock();
cout<<double(finish-start)/CLOCKS_PER_SEC<<endl;
return 0;
}