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「Geek每日一题」2014.12.30
@Zkuns
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Zkuns commented Dec 30, 2014 

def count (n, sum=0, adult=1, born=[0, 0, 0])
  return sum if n < 0
  count(n - 1, sum + adult, adult + born[0], [born[1], born[2], adult])
end
puts count(100)

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