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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.
Would you repost your solution please?
There is no solution that appears for me
Agreed.
Even if you could not come up with a fast solution for a single test case, you could precalculate just exactly that.