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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.
actually a pretty simple problem, only issues some people might have (myself included) is just not reading the problem carefully. At first I thought I had to check if input was an array of null, and I thought 0 was counted with the positive numbers. just read the question and read your code, you'll figure it out.
impostor syndrome is hitting real hard after seeing this lmfao. great job though!!!