```
#include <bits/stdc++.h>
using namespace std;
int s, v, wt, gt, gh, gm;
int main(){
cin >> s >> v;
wt = s/v;
if(s%v!=0)
wt++;
gt = (480 + 2880 - 10 - wt)%1440;
gh = gt/60;
if(gh<10)
cout << 0;
cout << gh << ':';
gm = gt%60;
if(gm<10)
cout << 0;
cout << gm << endl;
return 0;
}
```
by GipsyAvenger1 @ 2023-07-30 16:07:30
我的100分程序
by GipsyAvenger1 @ 2023-07-30 16:08:20