So I just saw this and found it kind of funny, a bit weird, I guess flattering and wondered if he should have at least asked me or gave me some credit and is he allowed to do this as the professor? !
I got a 100/100 in this 2000 words assignment for his course and today I decided to see the essay-like solution he posted for everyone to see, and there are complete paragraphs exactly the same as mine, even the commas. I didn't rediscover anything with this assignment, the topic is not new, but the expressions, the writing and the ideas are all mine.
Anyway I am not gonna say anything to him but I did laugh at the thought that if I ever use my answer again in a similar topic imagine if then I am accused of plagiarism from myself and/or him :)
(btw English is not my first language sorry for any mistakes)