```c
#include<bits/stdc++.h>
using namespace std;
int main(){
double s,v,m;
int n,a,t,b;
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;
}
```
~~求关注求关注求关注~~
by xhl_leo @ 2024-04-10 14:32:57