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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 is not especially difficult, but you need to take into account memory access time and structure your data accordingly. Smart iteration over a graph-like structure does the job well. FYI, for the sample tests, my code run in about 700ms, and around 10s for the complete test suite, so I guess you need to aim at 850ms top for the samples