这是我的代码
```cpp
#include<bits/stdc++.h>
using namespace std;
int main()
{
int s,v,t,a,h,m;
cin>>s>>v;
t=ceil(s*1.0/v);
a=(480+2880-10-t)%1440;
h=a/60;
m=a%60;
if(h<10)
cout<<0;
cout<<h<<":";
if(m<10)
cout<<0;
cout<<m;
}
```
by _joker_r @ 2024-06-06 08:12:56
[结果](https://www.luogu.com.cn/record/161391827)
by _joker_r @ 2024-06-06 08:14:25
```cpp
#include<iostream>
#include<cmath>
using namespace std;
int main(){
int s,v,h=0,m=0;
cin>>s>>v;
m=ceil(s*1.0/v);
m+=10;
m=8*60-m;
m=m+24*60;
m%=1440;
h=m%60;
m/=60;
if(h<10){
if(m<10){
cout<<0<<m<<":"<<0<<h;
}
else{
cout<<m<<":"<<0<<h;
}
}
else{
if(m<10){
cout<<0<<m<<":"<<h;
}
else{
cout<<m<<":"<<h;
}
}
return 0;
}
```
by _joker_r @ 2024-06-06 08:23:16
首先，你的m与h搞反了。其次，你的m要向上取整。再次，m要模24*60，这样如果m大于一天就可以减去一天。
by _joker_r @ 2024-06-06 08:25:51
@[zhizhenzhenzihao](/user/1271324) 谢谢
by NachoDoritosLOL @ 2024-06-06 22:11:53