```cpp
#include<bits/stdc++.h>
using namespace std;
double s,v,m;
int n,a,t,b;
int main()
{
cin>>s>>v;
n=8*60+24*60;
t=ceil(s/v)+10;
n=n-t;
if(n>=24*60) n-=24*60;
b=n%60;
a=n/60;
if(a<10)
{
if(b<10) cout<<"0"<<a<<":0"<<b;
else cout<<"0"<<a<<":"<<b;
}
else
{
if(b<10) cout<<a<<":0"<<b;
else cout<<a<<":"<<b;
}
return 0;
}
```
by pengzy___ @ 2022-02-07 14:17:52
@[xkg821](/user/672259)
by pengzy___ @ 2022-02-07 14:18:11
我的哪错了呢？
by xkg821 @ 2022-02-07 14:22:31
@[pengzy](/user/525177) 大佬帮我也看一下好吗，70分。。。
```
#include<bits/stdc++.h>
using namespace std;
int main()
{
int s,v,j=10;
scanf("%d %d",&s,&v);
if(s/v*1.0+j>480)//前一天出发
{
int t=s/v*1.0+j-480;
if(t>60)
{
int p=t/60;
int y=t%60;
printf("%.2d:%.2d",12-p-1,60-y-1);
}
if(t<=60)
{
printf("%.2d:%.2d",12-1,60-t-1);
}
}
if(s/v*1.0+j<=480)
{
int t=s/v*1.0+j;
if(t<=60)
{
printf("%.2d:%.2d",8-1,60-t-1);
}
if(t>60)
{
int p=t/60;
int y=t%60;
printf("%.2d:%.2d",8-p-1,60-y-1);
}
}
return 0;
}
```
by Zjxrhy @ 2022-02-18 16:25:40