UVA 10935 - Throwing cards away I (STL queue and deque)

#include <cstdio>
#include<iostream>
#include <queue>
using namespace std;

int main() {
int n, x;
queue<int> q;

while (scanf("%d", &n), n) {
for (int i = 1; i <= n; i++) {
q.push(i);
}

printf("Discarded cards:");
while (q.size() > 1) {
printf(" %d", q.front());
q.pop();
x = q.front();
q.pop();
if (!q.empty())
printf(",");
q.push(x);
}
printf("\nRemaining card: %d\n", q.front());
q.pop();
}
return 0 ;
}