poj 3916 Duplicate Removal

#include<iostream>#include<fstream>using namespace std;int main (int argc, char **argv){int n;int i;int before;int now;while(cin>>n){if (n ==0)break;cin>>before;cout<<before<<" ";for(i =0; i < n-1; i++){cin>>now;if(now!=before)cout<<now<<" ";before=now;}cout<<"$"<<endl;}return 0;}