10 lines
194 B
Python
10 lines
194 B
Python
def fib(limit=None):
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a, b = 1, 2
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yield a
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yield b
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while (not limit or a + b < limit):
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a, b = b, a + b
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yield b
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print(sum(n for n in fib(4_000_000) if n % 2 == 0))
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