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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.
Fixed
No because the problem set requires you to buy exactly 2 items. since there is no 0 cost item 5 has no valid pairing.
No reason. They are the same.
it's an alias AFAIK
A range defined with triple dots (...) does not include the endpoint, so it actually only goes from 0 to l-1.
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