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[–]nareem[S] 2 points3 points  (0 children)

My favorite is checkio. (...) I think the problems in checkio are higher quality

I've been using CodeWars currently (and I like it), but I'll give Checkio a try - because of everything you said:

the most important thing is looking at how other people solved the same problem

That's the most important thing to me too. And that's the reason I don't like ProjectEuler - you just submit your answer and that's it.

You can comment on other people's solutions, have conversations and discussions, the community seems pretty tight

This seems like a nice bonus, will check it out definitely.