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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.
easy
nnice!
Is O(n^2) best practice if O(n) is possible?
The task doesn't specify whether the array can be empty, but anyway thanks for the remark
if len(arr) == 0 then arr[0] will panic
I like this solution