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51 lines
1.2 KiB
51 lines
1.2 KiB
algorithm, image = ARGF.read.strip.split("\n\n")
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algorithm = algorithm.delete("\n") # for the example
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algorithm = algorithm.chars.map.with_index { [_2, _1 == ?#] }.to_h
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image = image.split("\n").flat_map.with_index {|row, y|
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row.chars.map.with_index {|pixel, x| [[y, x], pixel == ?#] }
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}.to_h
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image.default = false
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def each(image)
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return enum_for(__method__, image) unless block_given?
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ys = image.keys.map(&:first).minmax
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xs = image.keys.map(&:last).minmax
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(ys[0]-1..ys[1]+1).each do |y|
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(xs[0]-1..xs[1]+1).each do |x|
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yield [y, x]
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end
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end
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end
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def debug(image)
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ys = image.keys.map(&:first).minmax
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xs = image.keys.map(&:last).minmax
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puts (ys[0]-1..ys[1]+1).map {|y|
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(xs[0]-1..xs[1]+1).map {|x|
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image[[y,x]] ? ?# : ?.
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}.join
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}.join("\n")
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end
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50.times {
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ys = image.keys.map(&:first).minmax
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xs = image.keys.map(&:last).minmax
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prev_default = image.default
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image = each(image).to_h {|y,x|
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area = (-1..1).flat_map {|dy| (-1..1).map {|dx| image[[y+dy, x+dx]] }}
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index = area.map { _1 ? 1 : 0 }.join.to_i(2)
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pixel = algorithm.fetch(index)
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[[y,x], pixel]
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}
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image.default = prev_default ? algorithm.fetch(511) : algorithm.fetch(0)
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}
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p image.count { _2 }
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