```cpp
#include<bits/stdc++.h>
using namespace std;
int s,v;
bool flag;
int ans;
int ans_h;
int ans_min;
int main(){
cin>>s>>v;
if(s / v + 10 > 480)flag = true;
if(!flag){
if(s % v == 0)ans = 480 - s / v - 10;
else ans = 480 - s / v - 10 - 1;
int tmp = ans;
while(1){
if(tmp < 60)break;
tmp -= 60,ans_h ++;
}
ans_min = tmp;
if(ans_h < 10 && ans_min < 10)cout<<0<<ans_h<<":"<<0<<ans_min;
if(ans_h < 10 && ans_min >= 10)cout<<0<<ans_h<<":"<<ans_min;
if(ans_h >= 10 && ans_min < 10)cout<<ans_h<<":0"<<ans_min;
if(ans_h >= 10 && ans_min >= 10)cout<<ans_h<<":"<<ans_min;
exit(0);
}
else {
if(s % v == 0)ans = s / v + 10;
else ans = s / v + 10 + 1;
int tmp = ans;
tmp -= 480;
ans_h = 23;
ans_min = 60;
while(1){
if(tmp < 60)break;
tmp -= 60,ans_h --;
}
ans_min = 60 - tmp;
if(ans_h < 10 && ans_min < 10)cout<<0<<ans_h<<":"<<0<<ans_min;
if(ans_h < 10 && ans_min >= 10)cout<<0<<ans_h<<":"<<ans_min;
if(ans_h >= 10 && ans_min < 10)cout<<ans_h<<":0"<<ans_min;
if(ans_h >= 10 && ans_min >= 10)cout<<ans_h<<":"<<ans_min;
exit(0);
}
}
```
可以这样写
by C_Rong @ 2023-10-17 20:11:20
这是一道偏向数学思维的题，所以
我们可以~~打表~~。
by chenxizhe2 @ 2023-10-17 20:16:22
题解可以看看，我推荐第5和第6个，很清晰明了.
by chenxizhe2 @ 2023-10-17 20:19:09
@[chenxinrong](/user/902714) 您这个复制题解也得复制一个别人看得懂的吧.
by chenxizhe2 @ 2023-10-17 20:20:19
@[chenxizhe2](/user/658289) 谢谢！
by QianMengxun @ 2023-10-17 20:21:57
@[chenxinrong](/user/902714) 谢谢
by QianMengxun @ 2023-10-17 20:22:46
@[QianMengxun](/user/1066636) 没事
by chenxizhe2 @ 2023-10-17 20:30:32