Loading collection data...
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.
Apparently, moderators like the kata.
At least I do.
That's all in your head. The tests are fine.
This is less optimal for this problem since there's a simple firmula solution but it isn't limited to quadratic.