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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.
Can you explain why iterating and removing items from the array is bad practice?
My solution is pretty similar to this.
This is not so good because it has an O(n^2) time complexity. The solution can be achieved with O(n) time complexity.