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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.
The fun here is in finding out the algorithm for yourself. You shouldn't be a programmer if your first instinct is to google the algorithm.
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indx = arr.index(val)this will not work if there're duplicates in array.You can google pretty much any problem, the thing is working it out yourself.