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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.
Same happened to me, distance must be between [-1 and 1] so one if statement will do
There is a caution in the kata instuctions: 'This kata does not currently have any known supported versions for C++'.
However, you can switch to C language instead.