hdoj-1036-Average is not Fast Enough! (water question, pit)

 Topic link: Average is not Fast Enough!

 

 1 #include <iostream>
 2 #include <cstring>
 3 #include <string>
 4 #include <cstdio>
 5 using namespace std;
 6 int main() 
 7 {
 8     int n, id;
 9     double d;
10     cin>>n>>d;
11     while (cin>>id) {
12         printf("%3d: ", id);
13         int mark = 0;
14         int time = 0 ;
 15          for ( int i= 0 ; i<n; i++ ) {
 16              string str;
 17              cin>> str;
 18              if (str[ 0 ] == ' - ' ) {
 19                  mark = 1 ;
 20  //                 printf ("-\n"); can't be output here, because there will be multiple failures, WA several times 
21              }
 22              if (mark== 1 ) continue ;
 23              time += (str[ 0 ]- '0') * 3600+ ((str[2]-'0')*10+(str[3]-'0')) * 60 + (str[5]-'0')*10+(str[6]-'0');
24         }
25         if (mark == 1) {
26             printf("-\n");
27             continue;
28         }
29         double a = time / d;
30         int t = (int)(a + 0.5);
31         printf("%d:%02d min/km\n", t/60, t%60);
32     }
33     return 0;
34 }