hdu 1036

#include<stdio.h> int main() {     int i,n,sum,h,m,s,flag,t; char str[500];     float d;     scanf("%d%f",&n,&d);     while(~scanf("%d",&t))     {         flag=1,sum=0;         for(i=0;i<n&&flag;i++)         {if(scanf("%d:%d:%d",&h,&m,&s)==3)sum+=h*3600+m*60+s;else{gets(str);flag=0;        }         }         if(flag)         {             sum=sum/d+0.5;             printf("%3d: %d:%02d min/km\n",t,sum/60,sum%60);         }         else     printf("%3d: -\n",t);     }     return 0; }