a set is also unordered

i just did, but this seems more straightforward

so beautiful

Your post was visible in the homepage, that's why you should use spoiler flag here.

Why is this a spoiler? I'm not providing a different solution, I'm explaining why this solution is faster than others.

PS I get it. It compares 2 solutions and one of them is not here. Sorry about that.

Please use spoiler flag next time.