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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.
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because range works like (start,end], which excludes the end
it wont work if its just "root" and you have perfect square, because just "root" will exclude sqrt(n) itself
suppose 9, and root = sqrt(9) = 3
then range(1,3) is just 1,2.
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Why do we need to + 1 on the root?