HDU ACM 1036

 1 #include<iostream>
 2 #include<iomanip>
 3  using namespace std;
 4 
 5 int main()
 6 {
 7     int n, i, num;
 8     double d, sum, b[2];
 9     char a[7];
10     bool flag;
11     cin >> n >> d;
12     while(cin >> num){
13         sum = 0;
14         flag = 0;
15         for(i = 0; i < n; i++)
16         {
17             cin >> a;
18             if(a[0] == '-')
19                 flag = 1;//这原来多加了个break,结果一直WA……555，为什么去了就AC了，还是纳闷……
20             else
21                 sum += (a[0] - '0') * 60 + (a[2] - '0') * 10 + (a[3] - '0')+ ((a[5] - '0') * 10 + a[6] - '0') * 1.0 / 60;
22         }
23         if(!flag)
24         {
25         b[0] = sum / d;
26         b[1] = (b[0] - int(b[0])) * 60;
27         if(b[1] - int(b[1]) >= 0.5)
28             b[1] += 1;
29         if(b[1] >= 60)
30         {
31             b[0] += 1;
32             b[1] -= 60;
33         }
34         cout << setfill(' ') << setw(3) << num << ":" <<  setfill(' ') << setw(2) << (int)b[0] << ":" << setfill('0') << setw(2) << (int)b[1] << " min/km"<< endl;
35         }
36         else
37             cout << setfill(' ') << setw(3) << num << ": -" << endl;
38     }
39     return 0;
40 }
41 
42