Earlier quoted context omitted.
Do they? I very much doubt that.
I can't tell you how many times I've caught juniors trying to pass off unmodified SO answers as their own work. It's rather alarming to me because they have this attitude that popular things can't be wrong, and public things don't need attribution. But knowing, that people often approach life in this way, is half the battle.
Re: A* search: optimized implementation in Lisp
#21Could be worse when I’m really tired I copy the code from the question and fix that.