Day 4

2023/day4/p2.rb

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+# frozen_string_literal: true
+
+card_win_map = []
+total_cards = 0
+File.foreach('./2023/day4/data') do |line|
+  total_cards += 1
+  winning_nums = line.split(':')[1].strip.split(' | ')[0].split(' ').map(&:itself)
+  your_nums = line.split(':')[1].strip.split(' | ')[1].split(' ').map(&:itself)
+  card_win_map[total_cards - 1] = your_nums.count { |num| winning_nums.include?(num) }
+end
+
+cards_to_process = Array.new(card_win_map.length) { |i| i }
+until cards_to_process.empty?
+  current_card = cards_to_process.pop
+  card_win_map[current_card].times do |i|
+    cards_to_process << i + current_card + 1
+    total_cards += 1
+  end
+end
+
+puts total_cards