加起来除一下

然后四舍五入？反正这样过了

1 #include 
     
       2 #include 
      
        3 using namespace std; 4 int n; 5 double d,t; 6 int name,h; 7 char c[10]; 8 bool flag; 9 int main()10 {11     cin>>n>>d;12     int cnt=0;13     while(cin>>name)14     {15         t=0;16         flag=1;17         for(int i=1;i<=n;i++)18         {19             cin>>c;20             if(c[0]=='-') flag=0;21             if(flag)22             {23                 t+=(c[0]-'0')*60*60;24                 t+=((c[2]-'0')*10+c[3]-'0')*60;25                 t+=((c[5]-'0')*10+c[6]-'0');                26             }27         }28         if(!flag){29             printf("%3d: -\n",name);30             continue;31         }32         t=int((t/d)+0.5);33         printf("%3d:%2d:%02d min/km\n",name,(int)t/60,(int)t%60);34     }35 }