62 lines
1.0 KiB
Ruby
62 lines
1.0 KiB
Ruby
# frozen_string_literal: true
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input = File.readlines('./input').map(&:strip).map(&:chars)
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$dirs = [
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[-1, -1],
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[-1, 0],
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[-1, 1],
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[0, -1],
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[0, 1],
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[1, -1],
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[1, 0],
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[1, 1]
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]
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def round(map)
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output = []
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map.each_index do |row|
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output << []
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map[row].each_index do |col|
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tmp = $dirs.map do |x, y|
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x_index = row + x
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y_index = col + y
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char = loop do
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break nil if x_index.negative? || y_index.negative? || x_index >= map.size || y_index >= map[row].size
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char = map[x_index]&.[](y_index)
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x_index += x
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y_index += y
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next if char == '.'
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break char
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end
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char
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end
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occupied = tmp.compact.count('#')
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output[row][col] = case [map[row][col], occupied]
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in ['L', 0]
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'#'
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in ['#', 5..]
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'L'
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else
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map[row][col]
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end
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end
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end
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output
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end
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last_hash = 0
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out = input
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until out.hash == last_hash
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last_hash = out.hash
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out = round out
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end
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puts out.map{_1.count('#')}.inject(:+)
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