@[Sharkch](/user/1261470) 参考我的
```cpp
#include<bits/stdc++.h>
using namespace std;
inline int read()
{
int x=0,f=1;char ch=getchar();
while (ch<'0'||ch>'9'){if (ch=='-') f=-1;ch=getchar();}
while (ch>='0'&&ch<='9'){x=x*10+ch-48;ch=getchar();}
return x*f;
}
double s,v,m;
int n,a,t,b;
int main()
{
s=read(),v=read();
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 liverxiwo @ 2024-01-17 14:05:43
#### 审题很重要。
得考虑**半夜出发**的情况。
在14，15行中间添加：
```cpp
if (H - sum < 0) H += 24;
```
就AC了。
by I_Love_DS @ 2024-01-17 14:08:15
```
#include<iostream>
#include<iomanip>
#include<math.h>
using namespace std;
int main()
{
double s, v, t;
cin >> s >> v;
int H, num;
t = s / v + 10;
H = 7;
num = t / 60;
if (num)
{
if (num > 8)
{
H = 24 - num + 8;
t -= 60 * num;
}
H -= num;
t -= 60 * num;
}
cout << setw(2) << setfill('0') << H << ":" << setw(2) << setfill('0') << 60 - ceil(t);
return 0;
}
```
为什么我这么加还是不行哇@[liuruiqing](/user/1118614)
by Sharkch @ 2024-01-17 14:12:09
调不出来了……
看我的代码吧……
```cpp
#include <bits/stdc++.h>
using namespace std;
int s,v;
int main(){
cin >> s >> v;
// scanf("%d%d",&s,&v);
int k = ceil((double)s / v) + 10;
int t = 480 + 1440;
t -= k;
if (t >= 1440) t -= 1440;
if (t / 60 < 10) /*printf("0");*/cout << 0;
cout << t / 60 << ":";
// printf("%d:",t / 60);
if (t % 60 < 10) /*printf("0");*/cout << 0;
// printf("%d",t % 60);
cout << t % 60;
return 0;
}
```
by I_Love_DS @ 2024-01-17 14:34:40
@[liuruiqing](/user/1118614)
已经好了，多谢大佬
by Sharkch @ 2024-01-17 15:11:17
难得现在还有人在和我一样刷这样的基础题，感觉同为算法小白我的更容易理解一点，就直接分为半夜0点之前和之后就行。让你看看我的吧：
```cpp
#include<bits/stdc++.h>
using namespace std;
int main(){
double c,v;
int hour,min;
cin>>c>>v;
int minute = ceil(c/v);
int minutes = (minute+10);
if(minutes>480){
hour = 23-((minutes-480)/60);
min = 60-((minutes-480)%60);
printf("%02d:%02d",hour,min);
}
else if(minutes<=480)
{
hour = ((480-minutes)/60);
min = ((480-minutes)%60);
printf("%02d:%02d",hour,min);
}
return 0;
}
```
by panghuda @ 2024-01-18 20:21:53