```cpp
#include<bits/stdc++.h>
using namespace std;
int s,v;
int main()
{
cin >> s >> v; //在输入整数型的时候，cin比scanf更快
int t=ceil(1.0*s/v)+10; //类型转换
int a=60*(24+8)-t;
int b=(a/60)%24; //计算小时
int c=a%60; //计算分钟
printf("%02d:%02d\n",b,c);
return 0;
}
```
by LN_only45_ @ 2023-08-01 10:16:00
@[Tico0513](/user/838729) 谢谢，已经A了
by hysbzdkf @ 2023-08-05 17:15:35
此贴结
by hysbzdkf @ 2023-08-05 17:15:57