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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.
i had to use memoization to solve it.. although looking at some of the top answers didn't look like they did
Does this count as a dynamic programming problem?
Yikers, this was less clean of a solution than I hoped. Very satisfying!
Seems like the difficulty comes from interpreting mathematical equations (especially since the params of u aren't given to you, only an example).
It did run kind of slow, so maybe some optimization would be in order.