Advent of code day 02

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

Setup input

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

Part 01

input
|> Kino.Input.read()
|> String.split(["\n"])
|> Enum.map(fn line ->
  "Game " <> id = String.split(line, ":") |> List.first()

  matches =
    Regex.scan(~r/\d+\sblue|\d+\sred|\d+\sgreen/, line)

  colors =
    Enum.reduce(matches, %{}, fn [match], acc ->
      [num, color] = String.split(match)
      num_integer = String.to_integer(num)

      Map.update(acc, color, num_integer, fn existing_value ->
        Enum.max([num_integer, existing_value])
      end)
    end)

  {String.to_integer(id), colors}
end)
|> Enum.filter(fn {_, colors} ->
  Map.get(colors, "blue", 0) <= 14 and
    Map.get(colors, "red", 0) <= 12 and
    Map.get(colors, "green", 0) <= 13
end)
|> Enum.reduce(0, fn {gameID, _colors}, acc ->
  acc + gameID
end)

Part 02

input
|> Kino.Input.read()
|> String.split(["\n"])
|> Enum.map(fn line ->
  "Game " <> id = String.split(line, ":") |> List.first()

  matches =
    Regex.scan(~r/\d+\sblue|\d+\sred|\d+\sgreen/, line)

  colors =
    Enum.reduce(matches, %{}, fn [match], acc ->
      [num, color] = String.split(match)
      num_integer = String.to_integer(num)

      Map.update(acc, color, num_integer, fn existing_value ->
        Enum.max([num_integer, existing_value])
      end)
    end)

  {String.to_integer(id), colors}
end)
|> Enum.reduce([], fn {_id, colors}, acc ->
  {blue, green, red} =
    {Map.get(colors, "blue", 0), Map.get(colors, "red", 0), Map.get(colors, "green", 0)}

  [blue * green * red | acc]
end)
|> Enum.sum()