Advent of Code 2019 - Day 1

1.rb

file = File.read('input.txt')

answer = file.split("\n").map do |line|
  (line.to_i / 3).floor - 2
end.inject(0, :+)

puts answer

2.rb

file = File.read('input.txt')

answer = file.split("\n").map do |line|
  f = (line.to_i / 3).floor - 2

  fuels = [f]

  loop do
    f = (f / 3).floor - 2
    break if f.negative?

    fuels << f
  end

  puts fuels.join(",")

  fuels.inject(0, :+)
end.inject(0, :+)

puts answer