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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.
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I have the same problem and i think my code is efficient because i use recursion to go trough all possible paths and storing the total sum in a list, at the end i return the smallest element of the list. Does it still have to be more efficient? Or is it probaby because i use a global list to solve the problem? (i'll put the code as a reply to this msg marked as spoiler)