Day 13

Part 1

sample = """
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input = """
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"""

defmodule Aoc2023.Day13.Part1 do
  def find_hori_reflection(rows) do
    width = rows |> List.first() |> Enum.count()

    1..(width - 1)
    |> Enum.find(fn left ->
      cols = min(left, width - left)

      rows
      |> Enum.all?(fn row ->
        0..(cols - 1)
        |> Enum.all?(fn offset ->
          Enum.at(row, left - 1 - offset) == Enum.at(row, left + offset)
        end)
      end)
    end) ||
      0
  end

  def find_vert_reflection(rows) do
    v = rows |> Enum.zip() |> Enum.map(&Tuple.to_list/1) |> find_hori_reflection()
    v * 100
  end

  def find_reflection(rows) do
    find_hori_reflection(rows) + find_vert_reflection(rows)
  end

  def run(input) do
    input
    |> String.split("\n")
    |> Enum.chunk_by(fn s -> s == "" end)
    |> Enum.filter(fn map -> map != [""] end)
    |> Enum.map(fn m -> m |> Enum.map(fn l -> l |> String.split("", trim: true) end) end)
    |> Enum.map(&find_reflection/1)
    |> Enum.sum()
  end
end

Aoc2023.Day13.Part1.run(sample)

Aoc2023.Day13.Part1.run(input)

Part 2

defmodule Aoc2023.Day13.Part2 do
  def find_hori_reflection(rows) do
    width = rows |> List.first() |> Enum.count()

    1..(width - 1)
    |> Enum.find(fn left ->
      cols = min(left, width - left)

      diff =
        rows
        |> Enum.map(fn row ->
          0..(cols - 1)
          |> Enum.map(fn offset ->
            if Enum.at(row, left - 1 - offset) == Enum.at(row, left + offset) do
              0
            else
              1
            end
          end)
          |> Enum.sum()
        end)
        |> Enum.sum()

      diff == 1
    end) ||
      0
  end

  def find_vert_reflection(rows) do
    v = rows |> Enum.zip() |> Enum.map(&Tuple.to_list/1) |> find_hori_reflection()
    v * 100
  end

  def find_reflection(rows) do
    find_hori_reflection(rows) + find_vert_reflection(rows)
  end

  def run(input) do
    input
    |> String.split("\n")
    |> Enum.chunk_by(fn s -> s == "" end)
    |> Enum.filter(fn map -> map != [""] end)
    |> Enum.map(fn m -> m |> Enum.map(fn l -> l |> String.split("", trim: true) end) end)
    |> Enum.map(&find_reflection/1)
    |> Enum.sum()
  end
end

Aoc2023.Day13.Part2.run(sample)

Aoc2023.Day13.Part2.run(input)