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EHDEV/ethiopian_multiply.py

Created March 21, 2015 18:45
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Ancient Ethiopian Multiplication by Addition (Base 2)
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ethiopian_multiply.py
def multiply(x1, x2):
x1, x2 = min(x1, x2), max(x1, x2)
u = 0
while x1 >= 1:
if x1 % 2 or x2 % 2:
u += x2
x1 /= 2
x2 *= 2
return u
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