I was curious and actually posted my solution to this https://bountify.co/J

I should say that I will not be participating in this in future unless I am assured that my solution has equal chances of acceptance.

I posted my solution few minutes after the first solution was posted . ( my approach was completely different on handling the file uploading) later after some time I was shocked to see that the first answer was edited and was following the approach I had followed.

I am not saying that code was copied. what I am saying is that it's not good to allow other participants to see the different solutions . Also I would suggest that you maintain version of every answer. ( so that you can track the edits ) ..