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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.
xor solution is n. Most efficient
damn i have never seen anyone write this like that lol. why dont you just use O(n^2)?
And wouldnt you rather then say that your dictionary one would be O(n+m) with m <= n?