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defmodule Day01 do
@spec part1([integer]) :: integer
def part1(input) do
input
|> Enum.map(&naive_fuel_requirement/1)
|> Enum.sum()
end
@spec part2([integer]) :: integer
def part2(input) do
input
|> Enum.map(&recursive_fuel_requirement/1)
|> Enum.sum()
end
defp naive_fuel_requirement(mass) do
div(mass, 3) - 2
end
defp recursive_fuel_requirement(mass) do
fuel_mass = div(mass, 3) - 2
case fuel_mass do
n when n <= 0 -> 0
_ -> fuel_mass + recursive_fuel_requirement(fuel_mass)
end
end
end
input = Util.Input.read_numbers("day01")
input |> Day01.part1() |> IO.inspect()
input |> Day01.part2() |> IO.inspect()
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