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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.
best code with least time complexcity
I love that you named the non-unique number culprit XD
but it is a bit confusing that you named the number that is the same the "culprit"
also your code is much more understandable than others :)
I like this one a lot.