28 lines
551 B
Elixir
28 lines
551 B
Elixir
defmodule Day1Part2 do
|
|
def run do
|
|
{a, b, c} =
|
|
File.read!("input")
|
|
|> String.trim()
|
|
|> String.split("\n")
|
|
|> Enum.map(&String.to_integer/1)
|
|
|> find_2020()
|
|
|
|
IO.puts("#{a} x #{b} x #{c} = #{a * b * c}")
|
|
end
|
|
|
|
def find_2020([current | rest]) do
|
|
pair =
|
|
for i <- rest, j <- rest do
|
|
if current + i + j == 2020, do: {i, j}, else: nil
|
|
end
|
|
|> Enum.find(&match?({_, _}, &1))
|
|
|
|
case pair do
|
|
{a, b} -> {a, b, current}
|
|
nil -> find_2020(rest)
|
|
end
|
|
end
|
|
end
|
|
|
|
Day1Part2.run()
|