Advent of code day 09

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

Setup input

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

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

Part 01

coords =
  example
  |> Kino.Input.read()
  |> String.split(["\n", ","], trim: true)
  |> Enum.map(&String.to_integer/1)
  |> Enum.chunk_every(2)

calc_distance = fn [x1, y1], [x2, y2] ->
  abs(x1 - x2 + 1) * abs(y1 - y2 + 1)
end

distances =
  for {a, i} <- Enum.with_index(coords),
      {b, j} <- Enum.with_index(coords),
      i < j do
    {calc_distance.(a, b), {a, b}}
  end
  |> Enum.sort(:desc)
  |> Enum.take(1)
  |> then(fn [{d, _} | _] -> d end)

Part 02