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martinr448/prodsum.py

Last active September 4, 2018 18:23
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prodsum.py
def sum_of_products(a, n):
running_totals = [0] * n
for x in a:
for i in range(n - 1):
running_totals[i] += running_totals[i + 1] * x
running_totals[-1] += x
return running_totals[0]
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