uva10935 - Throwing cards away I

#include<iostream>
#include<vector>
using namespace std;
int n;
vector<int> cards;
int main()
{
    while(cin >> n && n){
        int first = 1;
        for(int i = 1; i <= n; i++)
            cards.push_back(i);
        cout << "Discarded cards:";
        while(!cards.empty()){
            if(cards.size() == 1)
                break;
            if(first){
                first = 0;
                cout << " ";
            }else cout << ", ";
            cout << cards[0];
            cards.erase(cards.begin());
            cards.push_back(cards[0]);
            cards.erase(cards.begin());
        }
        cout << endl;
        cout << "Remaining card: " << cards[0]  << endl;
        cards.clear();
    }
    return 0;
}

<pre name="code" class="cpp">#include<iostream>
#include<queue>
using namespace std;
queue<int> cards;
int n;
int main()
{
    while( cin >> n && n ){
        for(int i = 1; i <= n ; i++)
            cards.push(i);
        cout << "Discarded cards:";
        int first = 1;
        while( !cards.empty() ){
            if( cards.size() == 1) break;
            if(first) { first = 0; cout << " "; }
            else cout << ", ";
            cout << cards.front();
            cards.pop();
            cards.push(cards.front());
            cards.pop();
        }
        cout << endl << "Remaining card: " << cards.front()  << endl;
        while( !cards.empty() ){
            cards.pop();
        }
    }
    return 0;
}