Untitled notebook

Section

Mix.install([
  {:kino, "~> 0.14.2"}
])

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

ranges =
  input
  |> Kino.Input.read()
  |> String.split(",")
  |> Enum.map(fn pair -> pair |> String.split("-") |> Enum.map(&String.to_integer/1) end)

ranges
|> Enum.reduce([], fn [rangeStart, rangeEnd], acc ->
  invalidIds =
    Enum.filter(rangeStart..rangeEnd, fn value ->
      idString = value |> Integer.to_string()

      {l, r} = String.split_at(idString, idString |> String.length() |> Integer.floor_div(2))
      l == r
    end)

  acc ++ invalidIds
end)
|> Enum.sum()

ranges =
  input
  |> Kino.Input.read()
  |> String.split(",")
  |> Enum.map(fn pair -> pair |> String.split("-") |> Enum.map(&String.to_integer/1) end)

ranges
|> Enum.reduce([], fn [rangeStart, rangeEnd], acc ->
  invalidIds =
    Enum.filter(rangeStart..rangeEnd, fn value ->
      idString = value |> Integer.to_string()
      idLength = String.length(idString)

      1..Integer.floor_div(idLength, 2)
      |> Enum.find_value(fn value ->
        if value == 0 || Kernel.rem(idLength, value) != 0 || idLength < 2 do
          false
        else
          test = idString |> String.graphemes() |> Enum.chunk_every(value)
          !(test |> Enum.find_value(fn x -> x != List.first(test) end))
        end
      end)
    end)

  acc ++ invalidIds
end)
|> Enum.sum()