FIRST CODE：
#include
#include
using namespace std;
int main()
{
time_t begin,end;
begin=clock();
//your code
end=clock();
cout<<"runtime: "<}

DECOND CODE:
#include
#include
using namespace std;

void Test()//测试程序
{
for(int i=0; i<10; i++)
{
for(int j=0; j<10; j++)
{
printf("%d,%d\n",i,j);
}
}
}

int main(void)
{
LARGE_INTEGER BegainTime ;
LARGE_INTEGER EndTime ;
LARGE_INTEGER Frequency ;
QueryPerformanceFrequency(&Frequency);
QueryPerformanceCounter(&BegainTime) ;

//要测试的代码放在这里
Test();

QueryPerformanceCounter(&EndTime);

//输出运行时间（单位：s）
cout << "运行时间（单位：s）：" <<(double)( EndTime.QuadPart - BegainTime.QuadPart )/ Frequency.QuadPart <
system("pause") ;
return 0 ;
}