Solve of UVA 11723: Numbering Roads

Solve of UVA 11723: Numbering Roads

#include<bits/stdc++.h>

using namespace std;

int main()

{

    long long int a,b,c,e=1;

    double d;

    while(cin>>a>>b && a!=0 &&b!=0)

    {

        if(b>=a) cout<<"Case "<<e<<": "<<0<<endl;

        else if(a>b && (a-b)<=b*26) { d=a-b;cout<<"Case "<<e<<": "<<ceil((float)d/b)<<endl;}

        else cout<<"Case "<<e<<": "<<"impossible"<<endl;

        e++;

    }

    return 0;

}