```c
#include <bits/stdc++.h>
using namespace std;
double s,v,m;
int n,a,t,b;
int main(){
cin>>s>>v;
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 Li_mz__ @ 2022-10-25 17:42:58
嗯，分钟也要判断小于0，然后就只错了一个点，应该是逻辑有点问题，我再看看
@[Xunj4](/user/755849)
by WZRYWZWY @ 2022-10-25 18:14:34
把while(h<=0)改成<就可以了
min--;的位置应该要提前
```cpp
#include <iostream>
using namespace std;
int main()
{
int s, v,t,min=0,h=8;
cin >> s >> v;
t = s / v;
if(s%v!=0)
t++;
t += 10;
while (t)
{
min--;
if(min<0){
min += 60;
h--;
}
t--;
}
while (h<0)
{
h = 24 + h;
}
if (h<10)
{
cout << 0;
}
cout << h << ':';
if (min < 10)cout << 0;
cout << min;
}
```
@[Xunj4](/user/755849)
by WZRYWZWY @ 2022-10-25 18:42:21
@[WZRYWZWY](/user/704668)
谢谢
by 0xf000 @ 2022-10-27 16:45:26