```cpp
#include<bits/stdc++.h>
using namespace std;
int s,v,cnt,h,sum;
int main()
{
cin >> s >> v;
if(s%v==0)
cnt=s/v;
else cnt=s/v+1;
cnt+=10;
if(cnt<=60)
{
if(60-cnt<10)
cout << "07:0" << 60-cnt;
else
cout << "07:" << 60-cnt;
}
else
{
if(cnt%60==0)
h=cnt/60;
else
h=cnt/60+1;
if((8-h)<0)
{
if(h%8==0)
sum=h/8;
else
sum=h/8+1;
if(60-cnt%60==60)
cout << ((8+sum*24)-h)%24+1 << ":00";
else
{
if(60-(cnt%60)<10)
cout << ((8+sum*24)-h)%24 << ":0" << 60-(cnt%60);
else
cout << ((8+sum*24)-h)%24 << ":"<<60-(cnt%60);
}
}
else
{
if(60-(cnt%60)<10)
cout << "0" << 8-h << ":0" << 60-(cnt%60);
else
cout << "0" << 8-h << ":" << 60-(cnt%60);
}
}
return 0;
}
```
@[xiahaihan](/user/1403233)
by _luogu_huowenshuo_ @ 2024-09-28 08:06:04
@[_luogu_huowenshuo_](/user/884813)
谢谢，已关
by xiahaihan @ 2024-09-28 08:39:50