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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.
As far as I know, using the generator with the sum function sums the elements on the fly while iterating over the array only once, so there should be no time complexity impact.
Don't need the square brackets.
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