Comment by tempfile

It is far, far less effective than deriving the solution yourself. Don't take my word for it:

> If you absolutely cannot do it then go home and think but for heavens sakes don't look it up in a book till you give up. Looking it up in a book is giving up. > > Paul Halmos (https://www.robots.ox.ac.uk/~adutta/blog/quotations-powerful...)