Solution for Day 24

day_24/first.rb

@@ -0,0 +1,99 @@
+input = File.readlines('./input').map(&:chomp)
+
+class Tile
+  attr_accessor :x, :y, :z, :black, :white
+
+  NEIGHBOURS = {
+    'nw' => [0, +1, -1],
+    'ne' => [1, 0, -1],
+    'sw' => [-1, 0, +1],
+    'se' => [0, -1, +1],
+    'e' => [+1, -1, 0],
+    'w' => [-1, 1, 0]
+  }
+
+  def initialize(x,y,z)
+    @x, @y, @z = x, y, z
+    @black = false
+    @white = true
+  end
+
+  def walk_and_flip(dir)
+    if dir.empty?
+      @black, @white = @white, @black
+      return
+    end
+    move = if %w[se sw ne nw].include? dir[0,2]
+            move = dir[0,2]
+            dir.gsub!(/^../, '')
+            move
+          else
+            move = dir[0,1]
+            dir.gsub!(/^./, '')
+            move
+          end
+
+    offset = NEIGHBOURS[move]
+    next_coord = [@x, @y, @z].map.with_index {|c,i| c+offset[i]}
+    tile = if $tiles[next_coord]
+             $tiles[next_coord]
+           else
+             tile = Tile.new(*next_coord)
+             $tiles[next_coord] = tile
+             tile
+           end
+    tile.walk_and_flip(dir)
+  end
+
+  def next_day
+    neigh = neighbours
+    new_tile = self.dup
+    if @black && [0,3,4,5,6].include?(neigh.count(&:black))
+      new_tile.black = false
+      new_tile.white = true
+    elsif @white && neigh.count(&:black) == 2
+      new_tile.black = true
+      new_tile.white = false
+    end
+    new_tile
+  end
+
+  def neighbours
+    NEIGHBOURS.values.map do |offset|
+      next_coord = [@x, @y, @z].map.with_index {|c,i| c+offset[i]}
+      tile = if $tiles[next_coord]
+               $tiles[next_coord]
+             else
+               Tile.new(*next_coord)
+             end
+
+    end
+  end
+end
+
+def draw_bounds
+  $tiles.values.each do |t|
+    t.neighbours.each do |n|
+      $tiles[[n.x, n.y, n.z]] = n
+    end
+  end
+end
+
+$tiles = {[0,0,0] => Tile.new(0,0,0)}
+
+input.each do |dir|
+  $tiles[[0,0,0]].walk_and_flip(dir)
+end
+puts $tiles.values.count(&:black)
+
+$new_tiles = {}
+
+100.times do |i|
+  draw_bounds
+  $tiles.each do |coord, tile|
+    $new_tiles[coord] = tile.next_day
+  end
+  $tiles = $new_tiles
+  $new_tiles = {}
+end
+puts $tiles.values.count(&:black)

day_24/input

@@ -0,0 +1,556 @@
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day_24/test

@@ -0,0 +1,20 @@
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