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23 lines
479 B
23 lines
479 B
3 years ago
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ages = ARGF.read.split(?,).map(&:to_i)
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# 80.times do
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# new_fish = 0
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# ages.map! {|age|
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# if age.zero?
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# new_fish += 1
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# 6
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# else
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# age - 1
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# end
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# }
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# ages.concat(Array.new(new_fish) { 8 })
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# end
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# p ages.count
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DURATION = 256
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DESCENDANTS = Hash.new {|h,k|
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children = (k...DURATION).step(7)
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h[k] = children.count + children.map {|d| d + 9 }.select {|d| d < DURATION }.sum {|d| h[d] }
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}
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p ages.count + ages.sum {|age| DESCENDANTS[age] }
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