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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.
in the third test case, -1 is not only, array has three -1
result shouldn't be defined as 0 incase there was a 0 in the array
Only one number in an array is unique, and other numbers appear in pairs to find the unique number.