I&#x27;ve been working through them and the difficulty has been all over the map. I&#x27;ve gotten a couple of [what I thought were] moderately hard, whereas one problem basically had a very complicated phrasing, but the answer ended up being [length of the input vector] - 1, plus some other trivial ones.<p>It&#x27;s pretty fun though, even if you&#x27;re not looking for an interview.