Day 5: Cafeteria

Mix.install([:kino])

Section

input = Kino.Input.textarea("input", monospace: true)

input
|> Kino.Input.read()
|> String.split("\n\n")
|> then(fn [fresh, ingredients] ->
  fresh
  |> String.split(["-", "\n"])
  |> Enum.map(&String.to_integer/1)
  |> Enum.chunk_every(2)
  |> Enum.map(&apply(Range, :new, &1))
  |> then(fn fresh ->
    ingredients
    |> String.split()
    |> Enum.map(&String.to_integer/1)
    |> Enum.count(fn ingredient ->
      Enum.any?(fresh, &(ingredient in &1))
    end)
  end)
end)

input
|> Kino.Input.read()
|> String.split("\n\n", parts: 1)
|> List.first()
|> String.split(["-", "\n"])
|> Enum.map(&String.to_integer/1)
|> Enum.chunk_every(2)
|> Enum.map(fn [lower, upper] -> Range.new(lower, upper) end)
|> Enum.sort_by(&Enum.min/1)
|> Enum.chunk_while(
  nil,
  fn
    range, nil ->
      {:cont, range}

    lower..upper//_, range_min..range_max//_ when lower <= range_max + 1 ->
      {:cont, range_min..max(upper, range_max)}

    next_range, range ->
      {:cont, range, next_range}
  end,
  fn range ->
    {:cont, range, nil}
  end
)
|> Enum.map(&amp;Enum.count/1)
|> Enum.sum()