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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.
It was not clear that add/subtract operation must NOT be inplace operations. Wasted 15 minutes looking for errors in my code :(
it was OSM!
Shame to see so many loops in the c# solutions. Recursion FTW!
I suppose your function should have the same arguments as in the tests. You could use an auxiliary function.
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