```
#include<bits/stdc++.h>
using namespace std;
signed main()
{
int s,u,t;
scanf ("%d%d",&s,&u);
if ( s%u == 0)
{
t=s/u;
t+=9;
}
else
{
t=s/u;
t+=10;
}
int h;
int m;
h = 7;
m = 59;
while (t != 0)
{
if (m != 0)
{
m--;
}
else
{
if (h!=0)
{
h--;
m=59;
}
else
{
h=23;
m=59;
}
}
t--;
}
int a,b;
int c,d;
a = h/10;
b = h-(10*(h/10));
c = m/10;
d = m-(10*(m/10));
printf ("%d%d:%d%d",a,b,c,d);
return 0;
}
```
@ [ywx1228](https://www.luogu.com.cn/user/297958)
by SZH0523 @ 2022-09-14 21:09:33
```c
由于路途遥远，yyy 可能不得不提前一天出发
```
认真读题哦~
by kangshangcheng @ 2022-09-14 21:20:13
@[kangshangcheng](/user/433016) 哦哦谢谢！（下次一定注意！）
by ywx1228 @ 2022-09-21 19:09:44
@[SZH0523](/user/760455) 谢谢好人！！！
by ywx1228 @ 2022-09-21 19:10:29