10935 - Throwing cards away I

#include <cstdio>

int main() {
    for(int n; scanf("%d", &n) && n;) {
        int a[2*n];
        for(int i = 1; i <= n; i++)
            a[i] = i;
        printf("Discarded cards:");
        for(int i = 1; i < n; ++i) {
            if(i > 1) putchar(',');
            printf(" %d", a[i]);
            a[++n] = a[++i];
        }
        printf("\nRemaining card: %d\n", a[n]);
    }
}