17 lines
270 B
Ruby
17 lines
270 B
Ruby
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def even_fibonacci_up_to(n)
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Enumerator.new do |y|
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a = 0
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b = 1
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loop do
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temp = b
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b = a + b
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a = temp
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y << b
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end
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end.take_while { |i| i < n }.select { |i| i.even? }
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end
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def solution
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even_fibonacci_up_to(4000000).inject(:+)
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end
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