36 lines
750 B
Elixir
36 lines
750 B
Elixir
defmodule Day1 do
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def part1 do
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File.read!("lib/day1/input.txt")
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|> String.split("\n")
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|> Enum.reject(&(&1 == ""))
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|> Enum.map(fn line ->
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{module, _} = Integer.parse(line)
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fuel_for(module)
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end)
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|> Enum.sum()
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end
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def part2 do
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File.read!("lib/day1/input.txt")
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|> String.split("\n")
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|> Enum.reject(&(&1 == ""))
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|> Enum.map(fn line ->
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{module, _} = Integer.parse(line)
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total_fuel(module)
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end)
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|> Enum.sum()
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end
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def total_fuel(mass \\ part1())
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def total_fuel(mass) when mass <= 0, do: mass
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def total_fuel(mass) do
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fuel_mass = fuel_for(mass)
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fuel_mass + total_fuel(fuel_mass)
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end
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def fuel_for(mass) do
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max(Integer.floor_div(mass, 3) - 2, 0)
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end
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end
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