HDU 1036 - Average is not Fast Enough!

 1 #include <iostream>
 2 #include <cmath>
 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 }