```c
#include <iostream>
#include <cstdio>
using namespace std;
int main(){
int s,u,mi=470,hour,minute;
scanf("%d%d",&s,&u);
mi-=s/u;
if(s%u!=0){
mi-=1;
}
hour=mi/60;
minute=mi%60;
if(minute<0){
minute=60+minute;
if(hour<=0){
hour=24+hour;
}
hour--;
}
printf("%.2d:%.2d",hour,minute);
return 0;
}
```
by ZhuZining_king @ 2023-08-16 11:09:06
@[coool](/user/526922) 我的AC
by ZhuZining_king @ 2023-08-16 11:10:18
@[coool](/user/526922) 记得关注
by ZhuZining_king @ 2023-08-16 11:14:57
@[ZhuZining_king](/user/1066192) 已关注
by coool @ 2023-08-22 13:43:28
此贴结
by coool @ 2023-08-22 13:43:43
@[coool](/user/526922) 谢谢
by ZhuZining_king @ 2023-08-22 14:21:18