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PM2Ring/digit_substrings.py

Created June 6, 2017 16:55
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Hackerrank digit substring puzzle
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digit_substrings.py
n = '12345678901234567890'
total = units = a = sum(map(int, n))
for k, d in enumerate(n[:-1], 1):
units -= int(d)
a = (a - int(n[-k:])) * 10 + units
total += a
print(total)
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