#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;
}