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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'm found my issue. It was a problem with square root for big numbers.
This comment is hidden because it contains spoiler information about the solution
My solution works fine, but when I try submit it I get few errors.
I post my code below. It's Java.