95 lines
1.9 KiB
Ruby
95 lines
1.9 KiB
Ruby
map = {}
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input = File.readlines('./input').map.with_index do |line, i|
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line.chomp.chars.each_with_index { |char, pos| map[[pos, i, 0]] = char }
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end
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def draw_bounds(map)
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x = map.keys.map { |x, _, _| x }
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y = map.keys.map { |_, y, _| y }
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z = map.keys.map { |_, _, z| z }
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[x.min - 1, x.max + 1].each do |x|
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(y.min - 1..y.max + 1).each do |y|
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(z.min - 1..z.max + 1).each do |z|
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map[[x, y, z]] = '.'
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end
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end
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end
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[y.min - 1, y.max + 1].each do |y|
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(x.min - 1..x.max + 1).each do |x|
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(z.min - 1..z.max + 1).each do |z|
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map[[x, y, z]] = '.'
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end
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end
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end
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[z.min - 1, z.max + 1].each do |z|
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(y.min - 1..y.max + 1).each do |y|
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(x.min - 1..x.max + 1).each do |x|
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map[[x, y, z]] = '.'
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end
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end
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end
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map
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end
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def surrounding_cords(cord)
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x, y, z = cord
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cords = [
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# boottom
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[x, y, z - 1],
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[x - 1, y - 1, z - 1],
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[x, y - 1, z - 1],
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[x + 1, y - 1, z - 1],
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[x - 1, y, z - 1],
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[x + 1, y, z - 1],
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[x - 1, y + 1, z - 1],
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[x, y + 1, z - 1],
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[x + 1, y + 1, z - 1],
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# top
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[x, y, z + 1],
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[x - 1, y - 1, z + 1],
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[x, y - 1, z + 1],
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[x + 1, y - 1, z + 1],
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[x - 1, y, z + 1],
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[x + 1, y, z + 1],
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[x - 1, y + 1, z + 1],
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[x, y + 1, z + 1],
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[x + 1, y + 1, z + 1],
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# middle
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[x - 1, y - 1, z],
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[x, y - 1, z],
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[x + 1, y - 1, z],
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[x - 1, y, z],
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[x + 1, y, z],
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[x - 1, y + 1, z],
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[x, y + 1, z],
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[x + 1, y + 1, z]
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]
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end
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def cycle(map)
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new_map = {}
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map.each do |cord, _state|
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neighbours_active = surrounding_cords(cord).map { |cord| map[cord] == '#' }.count(true)
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if map[cord] == '#' && (2..3).include?(neighbours_active) ||
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map[cord] == '.' && neighbours_active == 3
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new_map[cord] = '#'; next
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else
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new_map[cord] = '.'
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end
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end
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new_map
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end
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6.times do
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map = draw_bounds(map)
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map = cycle(map)
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end
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puts map.vales.count('#')
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