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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.
No sample tests.
Provide test cases and more description about the problem. It is a simple problem, but more description will help.
This is a trivial duplicate of https://www.codewars.com/kata/opposite-number.
There are no sample tests.
Random tests in Python generate arrays of identical values.
The user can modify the array in JS, Ruby, Python.