I just noticed the google has put up a blog saying that even the website with the challenge and user submissions/rankings etc has been shut down completely. all that is left is a Github archive containing problems and solutions only.
It is worth noting that there were always some brilliant solutions available to the problems which different from the official ones by the LGMs here. Are all those submissions lost forever now?
Almost everything is archived here thanks to zibada.
Dude's a life saviour! All hail zibada. orz!