diff --git a/day_11/first.rb b/day_11/first.rb new file mode 100644 index 0000000..c48b37b --- /dev/null +++ b/day_11/first.rb @@ -0,0 +1,50 @@ +input = File.readlines('./input').map(&:strip).map(&:chars) + +$dirs = [ + [-1,-1], + [-1,0], + [-1,1], + [0,-1], + [0,1], + [1,-1], + [1,0], + [1,1] +] + + +def round(map) + output = [] + map.each_index do |row| + output << [] + map[row].each_index do |col| + tmp = $dirs.map do |x, y| + x_index = row + x + y_index = col + y + + next nil if x_index < 0 || y_index < 0 + map[row+x]&.[](col+y) + end + occupied = tmp.compact.count('#') + output[row][col] = case [map[row][col], occupied] + in ['L', 0] + '#' + in ['#', 4..] + 'L' + else + map[row][col] + end + end + end + + output +end + +last_hash = 0 +out = input + +until out.hash == last_hash + last_hash = out.hash + out = round out +end + +puts out.map{_1.count('#')}.inject(:+) diff --git a/day_11/input b/day_11/input new file mode 100644 index 0000000..23827a8 --- /dev/null +++ b/day_11/input 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= File.readlines('./input').map(&:strip).map(&:chars) + +$dirs = [ + [-1,-1], + [-1,0], + [-1,1], + [0,-1], + [0,1], + [1,-1], + [1,0], + [1,1] +] + + +def round(map) + output = [] + map.each_index do |row| + output << [] + map[row].each_index do |col| + tmp = $dirs.map do |x, y| + x_index = row + x + y_index = col + y + + char = loop do + break nil if x_index < 0 || y_index < 0 || x_index >= map.size || y_index >= map[row].size + char = map[x_index]&.[](y_index) + x_index += x + y_index += y + next if char == '.' + break char + end + + char + end + occupied = tmp.compact.count('#') + output[row][col] = case [map[row][col], occupied] + in ['L', 0] + '#' + in ['#', 5..] + 'L' + else + map[row][col] + end + end + end + + output +end + +last_hash = 0 +out = input + +until out.hash == last_hash + last_hash = out.hash + out = round out +end + +puts out.map{_1.count('#')}.inject(:+)