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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.
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This one is the winner, except the second order by isn't necessary. Still, O(nlogn) is the best complexity.
This is incredibly slow, as Enumerable.Range needs to generate every number in every range you feed it.
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If you don't want to copy the parameter (time and memory constraints), but want to use it without altering it, you pass it by const reference.