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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.
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9E9 is
9 * 10 ** 9
For this specified problem, it means a effectively large number, in order to ignore the first sum from the beginning of the input
Could also be
-float('inf')
but this one is shorter and enough for all test cases