1113 - Discover the Web

#include<bits/stdc++.h>
using namespace std;
 
int main()
{
    int T,c=1;
//    freopen("check.txt","r",stdin);
    scanf("%d",&T);
 
    while(T--)
    {
        string str,web,current;
        stack<string> backsite,forsite;
        current = "http://www.lightoj.com/";
        printf("Case %d:\n",c++);
        while(1)
        {
            cin >> str;
            if(str == "QUIT")
                break;
            if(str == "VISIT")
            {
                cin >> web;
                backsite.push(current);
                current = web;
                while(!forsite.empty())
                    forsite.pop();
            }
            else if(str == "BACK")
            {
                if(backsite.empty())
                {
                    printf("Ignored\n");
                    continue;
                }
                else
                {
                    forsite.push(current);
                    current = backsite.top();
                    backsite.pop();
                }
 
            }
            else
            {
                if(forsite.empty())
                {
                    printf("Ignored\n");
                    continue;
                }
                else
                {
                    backsite.push(current);
                    current = forsite.top();
                    forsite.pop();
                }
            }
            cout << current << endl;
        }
    }
    return 0;
}