dãy nhị phân quay lui

/*
 * nhiphan.cpp
 *
 * Copyright 2014 by nguyenvanquan7826
 *
 * Email : [email protected]
 * Blog : nguyenvanquan7826.wordpress.com
 *
 */

#include <iostream>
#define N 3
using namespace std;

int a[N];
void quaylui(int i){
    for (int j = 0; j < 2; j++){
        a[i] = j;
        if (i < N){
            if (i == N - 1){
                for (int k = 0; k < N; k++)
                    cout << a[k];
                cout << endl;
            }
            else quaylui(i+1);
        }
    }
}

int main (int argc, char **argv)
{
    quaylui(0);
    return 0;
}