25 lines
426 B
Elixir
25 lines
426 B
Elixir
|
defmodule Day1Part1 do
|
||
|
|
def run do
|
||
|
|
{a, b} =
|
||
|
|
File.read!("input")
|
||
|
|
|> String.trim()
|
||
|
|
|> String.split("\n")
|
||
|
|
|> Enum.map(&String.to_integer/1)
|
||
|
|
|> find_2020()
|
||
|
|
|
||
|
|
IO.puts("#{a} x #{b} = #{a * b}")
|
||
|
|
end
|
||
|
|
|
||
|
|
def find_2020([current | rest]) do
|
||
|
|
target = 2020 - current
|
||
|
|
|
||
|
|
if Enum.member?(rest, target) do
|
||
|
|
{current, target}
|
||
|
|
else
|
||
|
|
find_2020(rest)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
Day1Part1.run()
|