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loj1113.cpp
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loj1113.cpp
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using namespace std;
#include<iostream>
#include<cstring>
#include<stack>
#include<cstdio>
const string BACK = "BACK";
const string FORWARD = "FORWARD";
const string VISIT = "VISIT";
const string QUIT = "QUIT";
int main()
{
int T,Case=1;
cin>>T;
while(T--)
{
stack<string>forward,backward;
string str,newstr,str2;
printf("Case %d:\n",Case++);
newstr="http://www.lightoj.com/";
while(cin>>str&&str!=QUIT)
{
if(str==VISIT)
{
cin>>str2;
backward.push(newstr);
newstr=str2;
while(!forward.empty())
{
forward.pop();
}
cout<<str2<<endl;
}
else if(str==BACK)
{
if(backward.empty())
cout<<"Ignored"<<endl;
else
{
forward.push(newstr);
newstr=backward.top();
backward.pop();
cout<<newstr<<endl;
}
}
else if(str==FORWARD)
{
if(forward.empty())
cout<<"Ignored"<<endl;
else
{
backward.push(newstr);
newstr=forward.top();
forward.pop();
cout<<newstr<<endl;
}
}
}
}
return 0;
}