37 lines
732 B
Ruby
37 lines
732 B
Ruby
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#!/usr/bin/env ruby
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require "debug"
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input = (ARGV.first.nil? ? DATA : ARGF)
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.read
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.split(/\s+/)
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.map(&:to_i)
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@cache = Hash.new
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def recursive_transform(stone, blinks = 0)
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if blinks.zero?
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return 1
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elsif @cache[[blinks, stone]]
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return @cache[[blinks, stone]]
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elsif stone.zero?
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res = recursive_transform(1, blinks - 1)
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elsif stone.digits.size.even?
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stone = stone.to_s
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mid = stone.size / 2
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res = [
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recursive_transform(stone[...mid].to_i, blinks - 1),
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recursive_transform(stone[mid..].to_i, blinks - 1)
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].sum
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else
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res = recursive_transform(stone * 2024, blinks - 1)
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end
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@cache[[blinks, stone]] = res
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end
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p input.map { recursive_transform(_1, 75) }.sum
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__END__
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125 17
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