```cpp
#include <bits/stdc++.h>
using namespace std;
int main()
{
int s,v;
int s_time=8*60+24*60;
cin>>s>>v;
double sum=ceil(s/v)+10;
if(s%v) sum++;s_time-=sum;
double h=s_time/60;
s_time%=60;
if(h>=24)
h-=24;
if(h<10)
{
if(s_time<10) cout<<"0"<<h<<":0"<<s_time;
else cout<<"0"<<h<<":"<<s_time;
}
else
{
if(s_time<10) cout<<h<<":0"<<s_time;
else cout<<h<<":"<<s_time;
}
return 0;
}
```
by ninji @ 2023-04-10 19:34:09
@[Domoo](/user/535848)
by ninji @ 2023-04-10 19:34:32
@[ninji](/user/927666) 收到感谢！
by Domoo @ 2023-04-11 00:33:48