有大佬能看一下教教我怎么改吗TNT

#include <bits/stdc++.h>
using namespace std;

int main()
{
	double n,m;
	int v,k,s,f;
	cin>>n>>m;
	v=8*60+24*60;
	k=ceil(n/m)+10;
	v=v-k;
	if(v>=24*60) v-=24*60;
	f=v%60;
	s=v/60;
	cout<<s<<':'<<f;
	return 0;
}