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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.
Duplicate of plenty knapsack problems.
Description does not mention that a solution is always possible ( total price of products will always exceed 500 yen ). No performance testing ( 4 kyu? really ?!? ). Description could make more clear that card can only be used when purchases cost more than 500 yen, not more than or equal to. Description's English is a bit broken.