contents = File.read!("inputs/day1.txt")
codepoints = String.codepoints(contents)

floors =
  Enum.map(codepoints, fn
    "(" -> 1
    ")" -> -1
  end)
  |> Enum.scan(0, &(&1 + &2))

endFloor = List.last(floors)
firstBasement = Enum.find_index(floors, fn x -> x < 0 end) + 1

IO.puts("Final floor: #{endFloor}")
IO.puts("First basement on instruction: #{firstBasement}")