@[W3240663127](/user/820456)
```
#include<bits/stdc++.h>
using namespace std;
signed main()
{
int s,u,t;
scanf ("%d%d",&s,&u);
if ( s%u == 0)
{
t=s/u;
t+=9;
}
else
{
t=s/u;
t+=10;
}
int h;
int m;
h = 7;
m = 59;
while (t != 0)
{
if (m != 0)
{
m--;
}
else
{
if (h!=0)
{
h--;
m=59;
}
else
{
h=23;
m=59;
}
}
t--;
}
int a,b;
int c,d;
a = h/10;
b = h-(10*(h/10));
c = m/10;
d = m-(10*(m/10));
printf ("%d%d:%d%d",a,b,c,d);
return 0;
}
```
by SZH0523 @ 2022-10-07 17:54:03
@[W3240663127](/user/820456)
```cpp
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int u, v, a, h, m;
cin >> u >> v;
a=ceil(1.0*u/v) + 10;
h=ceil(1.0*a/60), m=60-(a-1)%60-1;
//cout << h << " ";
if(h <= 8) {
h=8-h;
if(h<10) cout << "0";
cout << h << ":";
}
else if(h > 8) {
h=24-(h-8);
if(h<10) cout << "0";
cout << h << ":";
}
if(m < 10) cout << "0";
cout << m << endl;
return 0;
}
```
我的代码
by zqyha @ 2022-10-07 17:54:23
@[Yu0215](/user/610096) dalao你好,其他都看懂了,感觉你写的比我真的好很多,但是有一处我不明白,h=ceil(1.0*a/60), m=60-(a-1)%60-1;为什么h还要向上取整,m最后为什么还要再减一呢
by W3240663127 @ 2022-10-07 19:18:46
@[W3240663127](/user/820456)
我先声明抱歉,昨天浏览器没时间了,所以没有上线。
第一处向上取整,我觉得你可以自己研究一下,这里向上取整只是为了后面做差方便一点
第二处,题目说了需要提前一分钟,所以时间再减去1(提前)
by zqyha @ 2022-10-08 17:19:22