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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.
True, it is surely developer friendly! But, in complexity of time and space its much more requiring than some other algorithms like counting sort and regex...!
You are calling explode function in this two times! not required...! create a reference for it and use it afterwards... : /