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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.
fixed for JS
fixed in JS
Big part of the answers are incorrect. [[0,1],[0,3],[1,2],[1,2]] this type of array will breake their code. So you can not just calculate sum of left and right shoes. You need to check every of pair (sort or something like this). And you can not make the array unique
this answer is not correct. try this [[0,1],[0,3],[1,2],[1,2]] (expected true but actially false)