更新了一丢丢,满分通关：
```cpp
#include<bits/stdc++.h>
using namespace std;
int main()
{
int t,timeh,timem;
double s,v;
cin>>s>>v;
t=ceil(s/v);
t=470-t;
while(t<0)
{
t+=1440;
}
timeh=t/60;
timem=t%60;
if(timeh>=10)
{
cout<<timeh;
}
else
{
cout<<"0"<<timeh;
}
if(timem>=10)
{
cout<<":"<<timem;
}
else
{
cout<<":0"<<timem;
}
return 0;
}
```
by Chenhy2022 @ 2022-06-29 14:14:06