void all_subsets(int* uset, int n)
{
    for (int i = 0; i < (int)pow(2, n); ++i) {
        string s = bitset<5>(i).to_string();

        int is_odd = true;
        for (int j = 0; j < s.size(); ++j) {
            if (j % 2 != 0)
            {
                if (s[j] != '1') is_odd = false;
            }
        }
        if (is_odd)
        {
            for (int j = 0; j < s.size(); ++j) {
                cout << s[j] << "\t";
            }
            cout << endl;
        }
    }
}