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Loading collection data...
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.
If you re-read the instruction, you'll notice there is an empty array at the last iteration. That empty array should turn into a zero.
ls = [0, 1, 3, 6, 10]
ls = [1, 3, 6, 10]
ls = [3, 6, 10]
ls = [6, 10]
ls = [10]
ls = []
output -> [20, 20, 19, 16, 10, 0]
check your return
because you haven't returned anything?