There's this nice online judge http://acm.mipt.ru/judge that contains some important classic problems like Hard life. It's still running but looks like it was forsaken for years, because it doesn't even support C++11. I was going to submit some problems there, but I'm too used to new C++ features. Is there somebody from MIPT who can update the compilers? Thank you.
Why you don't use gyms or opentrains? I didn't checked, but I'm pretty sure plenty of important classic problems are present in this resources.
I reported admin about your request. There is not so many active users on this online judge, so only critical features are supported.
Can you also request to update Java to 1.8? Thanks :)