2022/day02.rb

lines = ARGF.read.split("\n")
part1 = part2 = 0

lines.each do |line|
  theirs = line[0].ord - 'A'.ord
  ours = line[2].ord - 'X'.ord

  part1 += ours + (ours - theirs + 1) % 3 * 3 + 1
  part2 += ours * 3 + (theirs + ours - 1) % 3 + 1
end

puts part1, part2