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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Not sure what you mean but pretty sure this is a Suggestion at best. The description is sufficiently clear as to what input is expected and what behaviour the user solution should exhibit in each case.
Thanks for mentioning it.
Could you please check the test cases now?
Maybe you could google "IOrderedEnumerable"... and take a look at how the problem is solved in one or two other languages:-)
Done.