Solved Day 18

day18/input

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day18/input.testing

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+.#.#.#
+...##.
+#....#
+..#...
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+####..

day18/solution.rb

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+#!/bin/env ruby
+require 'pry'
+
+lights = File.readlines('./input').map(&:chomp).map(&:chars)
+
+@light_grids = [Marshal.load(Marshal.dump(lights)), Marshal.load(Marshal.dump(lights))]
+@grid_size = lights.count
+runs = 100
+
+@part2 = false
+
+def animate(char, x, y, grid_num)
+  if @part2
+    case [x, y]
+    when [0, 0]
+      return '#'
+    when [0, @grid_size - 1]
+      return '#'
+    when [@grid_size - 1, 0]
+      return '#'
+    when [@grid_size - 1, @grid_size - 1]
+      return '#'
+    end
+  end
+  neighbors = []
+  (x - 1).upto(x + 1) do |x_pos|
+    next if x_pos < 0 or x_pos >= @grid_size
+
+    (y - 1).upto(y + 1) do |y_pos|
+      next if y_pos < 0 or y_pos >= @grid_size
+      next if x_pos == x and y_pos == y
+
+      # puts "#{grid_num},#{x_pos},#{y_pos}"
+      neighbors.push(@light_grids[grid_num][x_pos][y_pos])
+    end
+  end
+  on_neighbors = neighbors.count('#')
+  if char == '#'
+    if [2, 3].include?(on_neighbors)
+      '#'
+    else
+      '.'
+    end
+  elsif on_neighbors == 3
+    '#'
+  else
+    '.'
+  end
+end
+
+def print_grid(grid)
+  grid.each { |line| puts line.join }
+end
+
+@light_grids.cycle(runs / 2).with_index do |grid, i|
+  current_grid = i % 2 # References the current light grid
+  next_grid = current_grid == 1 ? 0 : 1
+  # puts "this grid: #{current_grid}, next grid: #{next_grid}"
+  grid.each_with_index do |line, x|
+    line.each_with_index do |char, y|
+      @light_grids[next_grid][x][y] = animate(char, x, y, current_grid)
+    end
+  end
+end
+puts @part2 == true ? "Part 2 Solution: #{@light_grids[0].flatten.count('#')}" : "Part 1 Solution: #{@light_grids[0].flatten.count('#')}"
+
+# binding.pry