It happens, that users before writing a full answer drop a sketch of their solution in comments. As it is very easy to do (you don't need to care about the details) such comments often appear before any other posts and the following answers are kind of tainted with "you have used my solution" despite the author working on his own.
This happens with answers too, but incomplete posts can be downvoted, and one does not have to click the "$n$ new answers" bar. On the other hand, the comments usually contain some clarification and accidentally reading an answer's sketch in the comment ruins all the fun.
Is this alright? Is there any policy about it? Are there any ways to deal with it?
I would appreciate your advice.
Edit: Some clarification.
While I approve of giving hints, and understand that sometimes the content of a hint "is not worthy" of being an answer (I do sometimes write such comments), my question is about posting an in-comment sketch with an intention of writing a full answer later.