You'd be surprised.. but we're trying to distinguish between someone who can code simple algorithms versus one who can't.
No, you are not. You have a terribly unbalanced expectation that someone who was just presented with this question will achieve the same depth that you have. But you have been on this question for a long time now, know it deeply, and from the comments on this thread, you still got half of it wrong anyway.
You’ve already lost me, dude. If the question can’t meaningfully differentiate between a junior and a high level senior, it’s a trash question.