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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.
my times for same are
positive_sum 33.97278720000759
positive_sum1 34.759848499903455
maybe you had bad luck for positive_sum generating only 1-digit numbers with random
After such solutions, the only feeling is "why there is no button for the worst practice...".