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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 think you missed int_val
The problem is finding the best speed so you have to optimize your code to the max. And of course, there'a bug in the problem...
Perhaps whoever designed the tests did not know very well the realm of integers (Z). By the way, did you know that -1,000,000 is less than -1