Subset Generate2

int n, a[100];
vector<int>subset;
void GenerateSubset(int i)
{
    if (i == n)
    {
        for (int  j = 0; j < subset.size(); j++) cout << subset[j] << ' ';
        cout << endl;
        return;
    }
    GenerateSubset(i + 1);
    subset.push_back(a[i]);
    GenerateSubset(i + 1);
    subset.pop_back();
}