I think Project Euler has a good compromise - you can see (and comment on!) solutions once you've successfully passed some baseline. Then you don't feel like yo

I think Project Euler has a good compromise - you can see (and comment on!) solutions once you've successfully passed some baseline. Then you don't feel like you cheated, but can pick apart their solutions, now that you've already focused on that problem for a while. I've learned a LOT figuring out how some outstanding PE submissions worked, translating their algorithms to my favorite languages.