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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.
can be solved with one pass on lst using numpy.cumsum, not best practice for me here
No need to recompute all the sums, clearly not best practice
best solution there! Much faster as there is no need to do direct multiplication for this problem.