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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.
solutions without recursion are better
Wrong solution, author mentioned to not use sqrt
Copying of huge matrices isn't smart. Why many solutions have it?
Converting to string is the worst solution. Not smart, not fast, not lightweight