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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.
You need to have the cmath library to use the 'sqrt' operation. Just add:
#include cmath
to the top of your program and it should fix it. Make sure to put "cmath" in angle brackets too.