Hahaha, first I tried it the same way, but with a bool array.
It didn't like that.. (Not enouth memory I guess)

But I think it's kina smart. (but inefficient AF)

That took way to long and timed ot way to many times.
Its a pain without the std::next_permutation, but also a interesting task.

Jesus christ that was a pain, hahaha.
It's a nice one dough. I solved it with dynamic vectors..
Good coding, cheers