#include<stdio.h>
#include<time.h>
void main()
{   long starttime = time(1);
    int i,a[5];
    for(i=0;i<5;i++)
    scanf("%d",&a[i]);
    long endtime = time(NULL);
    printf("\nTotal solve time is %4.0fs\n",difftime(endtime,starttime));
}

忘了说明，看程序所运行的时间~~~