9 lines
306 B
Text
9 lines
306 B
Text
struct Int
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def evil?
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self >= 0 && popcount.even?
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end
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end
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puts "Powers of 3:", (0...30).map{|n| (3u64 ** n).popcount}.join(' ') # can also use &** (to prevent arithmetic overflow)
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puts "Evil:" , 0.step.select(&.evil?).first(30).join(' ')
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puts "Odious:", 0.step.reject(&.evil?).first(30).join(' ')
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