最后一个的边界判断出了问题，会输出011:50这种，改成这样就好了
```
#include <iostream>
#include <iomanip>
#include <math.h>
// int 有十位
int s,v,t,h,m;
using namespace std;
int main()
{
cin >> s >> v;
// 只有小数与整数的结果是小数
t = ceil(static_cast<double>(s)/v)+10;
h = floor(t/60);
m = t % 60;
// 对无min的进行特判
if (m==0){
if (h<=8){
cout<<0<<8-h<<":"<<"00";
}else if(h>8 and h<=22){
cout<<24-(h-8)<<":"<<"00";
}else{ // 不要打两个数字00
cout<<0<<24-(h-8)<<":"<<"00";
}
}else{
if (h<=7){
if (m<=50){
cout<<0<<8-h-1<<":"<<60-m;
}else{
cout<<0<<8-h-1<<":"<<"0"<<60-m;
}
}else if(h>7 and h<=21){
if (m<=50){
cout<<24-(h-8)-1<<":"<<60-m;
}else{
cout<<24-(h-8)-1<<":"<<"0"<<60-m;
}
}else{
if (m<=50){
cout<<"0"<<24-(h-8)-1<<":"<<60-m;
}else{
cout<<"0"<<24-(h-8)-1<<":"<<"0"<<60-m;
}
}
}
return 0;
}
```
by znzryb @ 2024-08-01 10:05:48
@[znzryb](/user/1368189) 这是顺序结构
```cpp
#include <bits/stdc++.h>
using namespace std;
int main(){
float s,u;//int类型上取整无效
int t,hh=7,mm=0;
cin>>s>>u;
t=ceil(s/u)+10;//上学时间
hh=hh-(t/60)+24;//加24防止负数
mm=mm-(t%60)+60;//加60防止负数
printf("%.2d:%.2d",hh%24,mm%60);//c++的一个特性，%.2d是往前补0
return 0;
}
``````
by GAOchang12 @ 2024-08-07 11:21:02
@[GAOchang12](/user/1399241) 确实，牛逼
by znzryb @ 2024-08-07 15:08:59