```cpp
#include <cstdio>
int main() {
int s, v;
scanf("%d %d", &s, &v);
int min = s / v + 10; //10min分类时间
if (s % v != 0) min += 1;
int hour;
hour = min / 60;
int leftmin = min - hour * 60;
int hour1=8-hour; //显示小时
int min1 = 60 - leftmin; //显示分钟
if (leftmin > 0) hour1 -= 1;
if (hour1 < 0) hour1 += 24;
if (hour1 < 10 && hour1>0) {
printf("0"); printf("%d",hour1);
}
else if (hour1 >= 10)printf("%d", hour1);
else if (hour1 == 0) printf("00");
printf(":");
if (min1 < 10 && min1>0) {
printf("0%d", min1);
}
else if (min1 == 0) printf("00");
else printf("%d", min1);
return 0;
}
```
by muyangli @ 2022-11-05 17:42:15
头文件呢？
by sandwich03 @ 2022-11-05 17:42:21
```cpp
#include <cstdio>
using namespace std;
```
by sandwich03 @ 2022-11-05 17:43:14
[提交记录](https://www.luogu.com.cn/record/92926924)
你是不是忘记加上yyy垃圾分类的时间了？
by muyangli @ 2022-11-05 17:43:23
@[kakaluo_te](/user/866969)
by sandwich03 @ 2022-11-05 17:44:12
```
using namspace std
```
其实在你不用iostream的情况下可以不加，但是还要习惯性的加一下（至少我是加的）。
by muyangli @ 2022-11-05 17:46:49
@[muyangli](/user/720023) 忘加了 阿哲
by telankesi @ 2022-11-05 21:32:29
@[linzhi123](/user/796403) 我没有在帖子里打上 提交的有
by telankesi @ 2022-11-05 21:33:24
@[muyangli](/user/720023) iosstream是什么
by telankesi @ 2022-11-05 21:35:54
```cpp
#include <iostream>
```
是C++才有的输入输出头文件，C语言没有，所以才要加std，否则会CE。
by muyangli @ 2022-11-06 07:37:08