I'm referring to Check if a spelled number is in a range in C++. It was featured in the most recent StackOverflow newsletter.
It is admittedly an interesting question with a very cool and elegant top-voted answer. Overall, this question doesn't really constitute too much of a sore spot for StackOverflow.
Nonetheless, this seems like one of those questions that, while a good question elsewhere, would normally be closed on StackOverflow. It has a request for an algorithm and lists a few examples of input/output, but that's it. It doesn't show any attempt to come up with a solution before posting, no hangups or problems encountered, no code, etc... It's a classic "here's what I need" question.
The reason I'm asking about it here (instead of just casting a close vote) is that I noticed that it was recently edited by a moderator. I'm assuming that if a moderator read the question and it was the kind of question that should be closed, it would just be closed right then. So I'm wondering if I have it wrong -- is there some quality in this post that makes it acceptable on StackOverflow that other questions with similar lack-of-prerequisites do not have?