字符串-北大-1028

[china_sjc]

#include<iostream>
#include<cstring>
using namespace std;

int main()
{
char temp[8],stack[255][255]={"http://www.acm.org/"};
int k=0,n;
while(cin>>temp)
{
if(temp[0]=='Q')
break;
else if(temp[0]=='V')
{
k++;
cin>>stack[k];
cout<<stack[k]<<endl;
n=k;
}
else if(temp[0]=='B')
{
k--;
if(k<0)
{
cout<<"Ignored\n";
k=0;
}
else
cout<<stack[k]<<endl;
}
else
{
k++;
if(k>n)
{
cout<<"Ignored\n";
k=n;
}
else
cout<<stack[k]<<endl;
}
}
return 0;
}