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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.
It is the rounded result that is compared to the expected solution with fuzzy equality. You have to round the number yourself. And ± 1e-9 is more precise than ± 1e-2, not less.
(Asking for rounded results is bad practice, but it's too late to change the kata now).
Why does it say (+/- 1e-9) when it only allows for precicely rounded (+/- 1e-2) ? (C++)