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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.
Yes, it's a good solution in one line, but it does not use memory effective. We have a memory limit exception if parameter $n is huge number (for example, 1 Gb of memory is not enough if $n = 17 millions).
Based on the older comments on the discussion chain, it sounds like the test cases didn't originally match with the kata description (i.e. the random tests could test the solution with parameter value 0).
Why start the range at 0?
This solution should not be used for the resolution of this kata with level 4
Not working for all random test case I think. :)