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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.
Nice. Using the same algorithm as (almost) everybody else, but finding a way to make it nicer by building the answer string as you populate the table, instead of having to backtrack afterwards.
Of course, the downside is that you use more memory, and that it is possible that all the extra string allocations makes this slower than just using ints and backtracing in the end.
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