This happens to me from time to time...
I write an answer including different solutions and post it as a single answer, then after some minutes someone comes and posts a new answer, almost an exact copy of one of my solutions with a minor variation, or even no addition at all, which doesn't add anything helpful to my answer, and at best might be considered a useful comment.
When this happens I think, whatever... someone will ask them "what is the different between your answer and the one was posted 5 minutes ago?". But that doesn't happen; instead their answer gets a lot more attention and because of the answers having the same time/date of posting after the first few minutes, people might even think that mine is the copy.
So I'm thinking about posting my solutions at the same time as separate answers, which is okay I guess: Two answers on one question by the same user.
What do you suggest doing in situations like this?
Note: I believe in posting an improved answer with more details and description than others, as I did here - note that I made 14 revisions.