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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.
Somewhere, a compiler is weeping, but your solution works hopefully!
This comment is hidden because it contains spoiler information about the solution
Without seeing the code we have no clue either.
I have two pieces of code on my machine (one iterative and one recursive), both of which work perfectly well in all cases. However, weirdly, the recursive one fails on the test provided here, even though the arrays for which it fails actually work just fine on my computer. No clue what the issue can be.