Advent of Code 2022 - Day 10

2022/day10.livemd

Michael Ruoss

@mruoss

advent_of_code

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Advent of Code 2022 - Day 10

Mix.install([:kino, {:kino_aoc, git: "https://github.com/ljgago/kino_aoc"}, :kino_vega_lite])

Input

test_input = """
noop
addx 3
addx -5
"""

test_input_2 = """
addx 15
addx -11
addx 6
addx -3
addx 5
addx -1
addx -8
addx 13
addx 4
noop
addx -1
addx 5
addx -1
addx 5
addx -1
addx 5
addx -1
addx 5
addx -1
addx -35
addx 1
addx 24
addx -19
addx 1
addx 16
addx -11
noop
noop
addx 21
addx -15
noop
noop
addx -3
addx 9
addx 1
addx -3
addx 8
addx 1
addx 5
noop
noop
noop
noop
noop
addx -36
noop
addx 1
addx 7
noop
noop
noop
addx 2
addx 6
noop
noop
noop
noop
noop
addx 1
noop
noop
addx 7
addx 1
noop
addx -13
addx 13
addx 7
noop
addx 1
addx -33
noop
noop
noop
addx 2
noop
noop
noop
addx 8
noop
addx -1
addx 2
addx 1
noop
addx 17
addx -9
addx 1
addx 1
addx -3
addx 11
noop
noop
addx 1
noop
addx 1
noop
noop
addx -13
addx -19
addx 1
addx 3
addx 26
addx -30
addx 12
addx -1
addx 3
addx 1
noop
noop
noop
addx -9
addx 18
addx 1
addx 2
noop
noop
addx 9
noop
noop
noop
addx -1
addx 2
addx -37
addx 1
addx 3
noop
addx 15
addx -21
addx 22
addx -6
addx 1
noop
addx 2
addx 1
noop
addx -10
noop
noop
addx 20
addx 1
addx 2
addx 2
addx -6
addx -11
noop
noop
noop
"""

{:ok, puzzle_input} = KinoAOC.download_puzzle("2022", "10", System.fetch_env!("LB_AOC_SESSION"))

input_field =
  Kino.Input.select("input", [
    {test_input, "test_input"},
    {test_input_2, "test_input_2"},
    {puzzle_input, "puzzle_input"}
  ])

Parse & Prep

parsed =
  input_field
  |> Kino.Input.read()
  |> String.split("\n", trim: true)
  |> Enum.flat_map(fn
    "noop" -> [nil]
    "addx " <> nr -> [nil, String.to_integer(nr)]
  end)

Part 1

{batch_20, rest} = Enum.split(parsed, 19)

[batch_20 | Enum.chunk_every(rest, 40)]
|> Enum.scan(1, fn el, acc ->
  sum =
    el
    |> Enum.reject(&amp;is_nil/1)
    |> Enum.sum()

  sum + acc
end)
|> Enum.zip_with(20..220//40, &amp;(&amp;1 * &amp;2))
|> Enum.sum()

Part 2

Textual Representation

raw =
  parsed
  |> Enum.with_index()
  |> Enum.map_reduce(1, fn
    {op, cycle}, x ->
      pos = rem(cycle, 40)
      pixel = if x in (pos - 1)..(pos + 1), do: "#", else: "."
      new_x = if is_nil(op), do: x, else: x + op
      {pixel, new_x}
  end)
  |> elem(0)
  |> Enum.chunk_every(40)
  |> Enum.intersperse("\n")
  |> IO.iodata_to_binary()
  |> IO.puts()

VegaLite Chart

chart =
  VegaLite.new(width: 800, height: 100)
  |> VegaLite.mark(:square)
  |> VegaLite.encode_field(:x, "pos", type: :quantitative)
  |> VegaLite.encode_field(:y, "row", type: :quantitative)
  |> VegaLite.encode_field(:size, "size", type: :nominal)
  |> Kino.VegaLite.new()
  |> Kino.render()

parsed
|> Enum.with_index()
|> Enum.reduce(1, fn
  {op, cycle}, x ->
    row = div(cycle, 40)
    pos = rem(cycle, 40)

    if x in (pos - 1)..(pos + 1) do
      point = %{pos: pos, row: 5 - row, size: 10}
      Kino.VegaLite.push(chart, point)
    end

    if is_nil(op), do: x, else: x + op
end)

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