19 lines
240 B
Crystal
19 lines
240 B
Crystal
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def fibonacci_nums_up_to(n)
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result = [1] of Int32
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a = 1
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b = 2
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accum = 0
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while accum < n
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accum = a + b
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result << b
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a = b
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b = accum
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end
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result
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end
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puts fibonacci_nums_up_to(4000000).select{ |n| n.even? }.sum
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