hdu1036

注意精度进OKl了。。。。。

http://acm.hdu.edu.cn/showproblem.php?pid=1036

#include"iostream"
using namespace std;
int main()
{
   int n;
   double s;
   int m;
   char ch[100];
   int i,j,k;
   cin>>n>>s;
   while(cin>>m)
   {
       int mark=0;
       int sum=0;
       for(i=0;i<n;i++)
       {
           cin>>ch;
           if(ch[0]=='-'){ mark=1; continue;}
           sum+=(ch[0]-'0')*3600;
           sum+=((ch[2]-'0')*10+(ch[3]-'0'))*60;
           sum+=(ch[5]-'0')*10+ch[6]-'0';
       }
       if(mark==1)  printf("%3d: -\n",m);
       else
       {
            int y=sum/s;
            if(sum/s-y>0.5) y=y+1; //精度处理,四舍五入
            printf("%3d: %d:",m,y/60);
            if(y%60<10) printf("0");
            printf("%d min/km\n",y%60);
       }
    }
   return 0;
}