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