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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.
googled this one after seeing people use bitset, wondered its performance...
interestingly it pretty much compiles down to something that uses Hamming Distance,thats a new one to me
they don't test for underflow but overflow, seems a bit unfair.
I had similar, not sure why people insist on the string conversions