advent-of-code-day-1.rb

# frozen_string_literal: true

input = [
  51_360, 95_527, 72_603, 128_601, 68_444, 138_867, 67_294,
  134_343, 62_785, 53_088, 134_635, 137_884, 97_654, 103_704,
  138_879, 87_561, 83_922, 68_414, 84_876, 105_143, 76_599,
  98_924, 57_080, 63_590, 50_126, 111_872, 55_754, 64_410,
  78_488, 56_557, 105_446, 127_182, 59_451, 87_249, 61_652,
  131_698, 148_820, 95_742, 68_223, 121_744, 65_678, 99_745,
  64_089, 75_610, 106_085, 100_364, 116_959, 122_862, 56_580,
  109_631, 82_895, 79_666, 133_474, 50_579, 83_473, 140_028,
  125_999, 68_225, 131_345, 90_797, 84_914, 81_915, 65_369,
  71_230, 50_379, 106_385, 118_503, 119_640, 138_540, 70_678,
  95_881, 100_282, 123_060, 147_368, 93_030, 82_553, 131_271,
  147_675, 111_126, 115_183, 82_956, 145_698, 99_261, 52_768,
  99_207, 123_551, 64_738, 117_275, 98_136, 111_592, 78_576,
  118_613, 130_351, 68_567, 72_356, 85_608, 129_414, 66_521,
  76_924, 130_449
]

def mass(input)
  input.fdiv(3).floor - 2
end

def fuel(input, acc = 0)
  r = mass(input)
  return acc if r <= 0

  acc = fuel(r, acc + r) if r.positive?

  acc
end

puts input.sum(&method(:mass))
puts input.sum(&method(:fuel))