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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.
Duplicate.
As pointed out below.
Almost of the solution in the linked kata will easily pass the test, and argument of not stating the intended data structure is not strong enough to establish enough differentiability (otherwise people will start creating kata and just for the sake for avoiding the duplicacy they can give hint or state the data stucture to be used (e.g. use dictionary))