#include<iostream>
#include<sys/time.h>
using namespace std;
struct timer{
    public:
    struct timeval begin, end;
    timer(){ gettimeofday(&begin, NULL); }
    void start(){ gettimeofday(&begin, NULL); }
    void finish(){ gettimeofday(&end, NULL); }
    friend inline ostream & operator<<(ostream &os, timer &a){
        double use = 1000000 * (a.end.tv_sec - a.begin.tv_sec) + a.end.tv_usec - a.begin.tv_usec;
        use /= 1000000.0;
        os << use;
        return os;
    }
};

int main(){
    timer timer1;
    timer1.start();
    for(int i = 0; i < 100000000; i++);
    timer1.finish();
    cout << timer1;
    return 0;
}

#include<iostream>
using namespace std;
class temp{
    public:
        temp(){}
        ~temp(){ cout << "~temp" << endl; }
};
void f(temp a){ cout << "f" << endl;};

int main(){
    cout << "0" << endl;
    f(temp());
    cout << "1" << endl;
    return 0;
}