hdoj-1036-Average is not Fast Enough!(水题，坑)

 题目链接：Average is not Fast Enough!

 #include <iostream>
 #include <cstring>
 #include <string>
 #include <cstdio>
 using namespace std;
 int main()
 {
     int n, id;
     double d;
     cin>>n>>d;
     while (cin>>id) {
         printf("%3d: ", id);
         int mark = ;
         int time = ;
         for (int i=; i<n; i++) {
             string str;
             cin>>str;
             if (str[] == '-') {
                 mark = ;
 //                printf("-\n");不能在这里输出，因为会碰到多个不及格的，WA了数次
             }
             if(mark==)continue;
             time += (str[]-'') * + ((str[]-'')*+(str[]-'')) *  + (str[]-'')*+(str[]-'');
         }
         if (mark == ) {
             printf("-\n");
             continue;
         }
         double a = time / d;
         int t = (int)(a + 0.5);
         printf("%d:%02d min/km\n", t/, t%);
     }
     return ;
 }