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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.
Sorry if my comment was misleading. I eventually read the instructions linked through project Euler and I figured out what they wanted from that. I should redact my comment, i guess.
Instructions should include that the path of the longest slide should be determined by which of two possible downsteam choices is the larger number. This is not stateed anywhere in the instructions.