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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.
The hardest parts seem to (0) understand the problem in a meaningful way, (1) to optimize the solution so long that it passes all tests without timeout.
There's these two katas:
Notably both of these are scrapping from Codewars.