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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.
I just did it in c++, and if you look at the most voted answers there, you'll get sad u.u
It should have some hidden test cases on Attempt to avoid some persons to write a map with the test cases as answer
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Best solution, its clever and best practice at the same time
Finally a O(n) solution in the top solutions of this kata :)