http://addagram.mytestbench.com/ http://addagram.mytestbench.com/ I too have played with that one, but I used JavaScript... These problems are engaging enough

http://addagram.mytestbench.com/ http://addagram.mytestbench.com/ I too have played with that one, but I used JavaScript... These problems are engaging enough to keep you interested, especially when you are trying out a new language. The challenge is significant, and the optimizations required to solve these help you explore some the deeper depths of a language, when compared to a "hello world!" type of problem.