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Accepted

360K

16MS

G++

700B

#include<stdio.h>
#include<string.h>
char fs[100][71],bs[100][71];
int ftop,btop;
int main()
{
    char a[8],cur[71];
    strcpy(cur,"http://www.acm.org/");
    while(scanf("%s",a),strcmp(a,"QUIT")){
        if(!strcmp(a,"VISIT")){
            strcpy(bs[btop++],cur);
            scanf("%s",cur);
            puts(cur);
            ftop=0;
        }
        else if(!strcmp(a,"FORWARD")){    
            if(ftop){
                strcpy(bs[btop++],cur);
                strcpy(cur,fs[--ftop]);
                puts(cur);
            }
            else puts("Ignored");
        }
        else if(!strcmp(a,"BACK")){
            if(btop){
                strcpy(fs[ftop++],cur);
                strcpy(cur,bs[--btop]);
                puts(cur);
            }
            else puts("Ignored");
        }
    }
    return 0;
}

Accepted

688K

32MS

G++

564B

#include<iostream>
using namespace std;
string fs[100],bs[100];
int ftop,btop;
int main()
{
    string a,cur;
    cur="http://www.acm.org/";
    while(cin>>a,a!="QUIT"){
        if(a=="VISIT"){
            bs[btop++]=cur;
            cin>>cur;
            cout<<cur<<endl;
            ftop=0;
        }
        else if(a=="FORWARD"){    
            if(ftop){
                bs[btop++]=cur;
                cur=fs[--ftop];
                cout<<cur<<endl;
            }
            else cout<<"Ignored\n";
        }
        else if(a=="BACK"){
            if(btop){
                fs[ftop++]=cur;
                cur=bs[--btop];
                cout<<cur<<endl;
            }
            else cout<<"Ignored\n";
        }
    }
    return 0;
}