UVA 10935 Throwing cards away I

#include <cstdio>
#include <iostream>
#include <algorithm>
#include <cstring>
#include <queue>
using namespace std;
int n;
queue<int> que;
int main() {
while(cin >> n) {
if(n == 0)
break;
while(!que.empty()) {
que.pop();
}
for(int i = 1; i <= n; i++) {
que.push(i);
}
cout << "Discarded cards:";
int p = 0;
while(!que.empty()) {
int a = que.front();
que.pop();
if(que.empty()) {
cout << endl << "Remaining card: " << a << endl;
}
else {
if(p == 1) {
cout << ",";
}
cout << " " << a;
int b = que.front();
que.pop();
que.push(b);
}
p = 1;

}

}
return 0;
}