advent 2019 day 3

02.rb

class Thing

  def do_it(pos_1, pos_2, *input)
    nums = input.dup
    nums[1] = pos_1
    nums[2] = pos_2
    pos = 0
    while true
      case nums[pos]
      when 99
        return nums
      when 1
        (nums[nums[pos + 3]] = nums[nums[pos + 1]] + nums[nums[pos + 2]])
        pos += 4
      when 2
        (nums[nums[pos + 3]] = nums[nums[pos + 1]] * nums[nums[pos + 2]])
        pos += 4
      end
    end
  end

  def do_it_better(*nums)
    (0..99).each do |a|
      (0..99).each do |b|
        puts [a,b].inspect
        raise [a, b] if do_it(a,b, *nums)[0] == 19690720
      end
    end
  end
end

#Thing.new.do_it(12, 2, *ARGF.read.chomp.split(",").map(&:to_i))
Thing.new.do_it_better(*ARGF.read.chomp.split(",").map(&:to_i))

02_input.txt

1,0,0,3,1,1,2,3,1,3,4,3,1,5,0,3,2,13,1,19,1,6,19,23,2,6,23,27,1,5,27,31,2,31,9,35,1,35,5,39,1,39,5,43,1,43,10,47,2,6,47,51,1,51,5,55,2,55,6,59,1,5,59,63,2,63,6,67,1,5,67,71,1,71,6,75,2,75,10,79,1,79,5,83,2,83,6,87,1,87,5,91,2,9,91,95,1,95,6,99,2,9,99,103,2,9,103,107,1,5,107,111,1,111,5,115,1,115,13,119,1,13,119,123,2,6,123,127,1,5,127,131,1,9,131,135,1,135,9,139,2,139,6,143,1,143,5,147,2,147,6,151,1,5,151,155,2,6,155,159,1,159,2,163,1,9,163,0,99,2,0,14,0

02_test_1.txt

99