@[untiy](/user/1406308)
自己看看，要考虑的点挺多
```
#include<bits/stdc++.h>
using namespace std;
int main(){
int s,v;
cin>>s>>v;
int t=s/v;
if(s/v>3590)return 0;
else if(s%v!=0)t++;
int m=470-t;
if(m<0){
m=1440+m;
int h=m/60,minn=m%60;
if(h<10){
if(minn<10)cout<<0<<h<<":"<<0<<minn;
else cout<<0<<h<<":"<<minn;
}
else{
if(minn<10)cout<<h<<":"<<0<<minn;
else cout<<h<<":"<<minn;
}
}
else{
int h=m/60,minn=m%60;
if(h<10){
if(minn<10)cout<<0<<h<<":"<<0<<minn;
else cout<<0<<h<<":"<<minn;
}
else{
if(minn<10)cout<<h<<":"<<0<<minn;
else cout<<h<<":"<<minn;
}
}
return 0;
}
```
by haimingbei @ 2024-07-25 19:44:16