day 04

Mix.install([
  {:kino, "~> 0.5.0"}
])

Input

input = Kino.Input.textarea("Please paste your input file:")

input =
  input
  |> Kino.Input.read()
  |> String.split([",", "\n"])

Part 01

input
|> Enum.chunk_every(2)
|> Enum.reduce(0, fn [first_range, second_range | []], acc ->
  [a, b | _tail] = first_range |> String.split("-") |> Enum.map(&String.to_integer/1)
  [c, d | _tail] = second_range |> String.split("-") |> Enum.map(&String.to_integer/1)

  listA = Range.new(a, b) |> Enum.to_list()
  listB = Range.new(c, d) |> Enum.to_list()

  if listA -- listB == [] || listB -- listA == [] do
    acc + 1
  else
    acc
  end
end)

Part 02

input
|> Enum.chunk_every(2)
|> Enum.reduce(0, fn [first_range, second_range | []], acc ->
  [a, b | _tail] = first_range |> String.split("-") |> Enum.map(&String.to_integer/1)
  [c, d | _tail] = second_range |> String.split("-") |> Enum.map(&String.to_integer/1)

  listA = Range.new(a, b) |> Enum.to_list()
  listB = Range.new(c, d) |> Enum.to_list()

  if length(listA -- listB) < length(listA) || length(listB -- listA) < length(listB) do
    acc + 1
  else
    acc
  end
end)