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51 lines
1.2 KiB
51 lines
1.2 KiB
grove = {}
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ARGF.read.lines(chomp: true).each.with_index do |row, y|
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row.chars.each.with_index do |c, x|
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grove[[y,x]] = c == ?#
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end
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end
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dirs = [
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[[-1, -1], [-1, 0], [-1, 1]],
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[[ 1, -1], [ 1, 0], [ 1, 1]],
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[[-1, -1], [ 0, -1], [ 1, -1]],
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[[-1, 1], [ 0, 1], [ 1, 1]],
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]
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(1..).each do |i|
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proposals = grove.select { _2 }
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.to_h {|(y,x),_|
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to = if dirs.flatten(1).none? {|dy,dx| grove[[y+dy, x+dx]] }
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[y, x]
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elsif dir = dirs.find {|adj| adj.none? {|dy,dx| grove[[y+dy, x+dx]] }}
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dy, dx = dir[1]
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[y+dy, x+dx]
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else
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[y, x]
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end
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[[y,x], to]
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}
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proposals.each.with_object(Hash.new {|h,k| h[k] = []}) {|(from, to), conflicts|
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conflicts[to] << from
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}.select { _2.size > 1 }.values.flatten(1).each do |elf|
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proposals[elf] = elf
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end
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if proposals.all? { _1 == _2 }
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puts i
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exit
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end
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proposals.each do |from, to|
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grove[from] = false
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grove[to] = true
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end
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dirs.push(dirs.shift)
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end
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# y = grove.select { _2 }.keys.map(&:first).minmax
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# x = grove.select { _2 }.keys.map(&:last).minmax
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# p Range.new(*y).sum {|y| Range.new(*x).count {|x| !grove[[y,x]] }}
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