试试我这个
```cpp
#include<iostream>
using namespace std;
double s, v;
int n, a, t, b;
int main()
{
cin >> s >> v;
n = 8 * 60 + 24 * 60;//两天总共的分钟数
double m = s / v;
double M = m;
while (M >= 1)
{
M -= 1;
}
if (M != 0)
{
n--;
}
t = m + 10;//ceil()很重要，向上取整，否则按C++逻辑会向下取整导致行走时间少
n = n - t;//得出剩下的时间
if (n >= 24 * 60)
{
n -= 24 * 60;//判断是否在前一天
}
b = n % 60;//得出出发分
a = n / 60;//得出出发时
if (a < 10)//慢慢判断是否补0
{
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;
}
}
```
by guosir @ 2022-09-08 18:08:36