AC代码
```cpp
#include <bits/stdc++.h>
using namespace std;
int main()
{
int cnt, a , cnt1 , b;
double s, v;
cin >> s >> v;
cnt = 8 * 60 + 24 * 60;
cnt1 = ceil(s / v) + 10;
cnt = cnt - cnt1;
if(cnt >= 24 * 60)
{
cnt -= 24 * 60;
}
b = cnt % 60;
a = cnt / 60;
if(a < 10)
{
if(b <= 9)
{
cout << '0' << a << ":0" << b;
}
else
{
cout << '0' << a << ':' << b;
}
}
else
{
if(b <= 9)
{
cout << a << ":0" << b;
}
else
{
cout << a << ':' << b;
}
}
return 0;
}
```
by williamY @ 2022-10-21 08:58:46