lightoj - 1214 - Large Division

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
    int test;
    cin>>test;
    for(int t=1;t<=test;t++)
    {
        ll temp=0,b,j=0;
        string a;
        cin>>a;
        if(a[0]=='-')j=1;
        cin>>b;
        for(j;j<a.size();j++)
        {
            temp=temp*10+(a[j]-'0');
            temp=temp%b;
            //cout<<temp<<endl;
        }
        if(temp==0)printf("Case %d: divisible\n",t);
        else printf("Case %d: not divisible\n",t);
    }
}