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@cuihaoleo
Created September 28, 2014 01:34
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def fib (m):
a, b, c = 0, 1, 1
yield 1
while a+b <= m:
c = a + b
yield c
a, b= b, c
s = 0
for i in fib(4000000):
if i%2 == 0:
s += i
print s
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