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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.
It's unclear from the description if min_price([1,x]) should return 0 or 1
It shouldn't just be implied that any items in a store can be exactly valued by a combination of the coins. It needs to be explicitly stated or else the kata makes no sense.
This kata should be ranked as 3 or even 2 kyu imo. The test cases make it way more challenging performance wise than what the description suggests. Additionally, it would be very helpful to include the harder test cases in the description.