Day 03

Mix.install([
  :kino_aoc
])

Section

{:ok, puzzle_input} =
  KinoAOC.download_puzzle("2023", "3", System.fetch_env!("LB_ADVENT_OF_CODE_SESSION"))

{:ok,
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IO.puts(puzzle_input)

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........960*414........713.501......&............%.......*......*941............................#........415...........937%.................
....967............409..*......605......................375..771........599*884.................880.........*...127..$.................$513.
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800...............532............................15............%...445..102.............../510.........625.279..........-.....*.............
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.925...793...423*.........@..........................................................=.659..........*.....817.....230...........653..-......
.......*.........52...........764$....273...................@........430....................................*...........669.....-.......71..
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......................638............*...................*....81.......780.........*...../...282....................907.882.781.......797...
..........671....608.................295.................302......953............171..919.......*........................*...*......#.......
............*....*....251.....191........#............*..........................................999.....451....+....286.415.581....274.....
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...........................942.......323...............+.....623.........................804.......875........................#.............
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.....*..#........53........374........756...........*.........-.......................*........../..217*550..............*..................
....217..........*................................743......703....368...$861..4*966.415..703................................*959........*344
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.............@....................110...............*...309..#....&......210..........386.................%...........*........+........391.
.....444.....743......519..691......*.......-824......+......759.617....*.......710..*.....814.........356.........464.......709............
......*..746......247.....*......596..999.............907.............296.-..../.......760.+.................$.890.......................669
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....23.........960........307....$.....504.638*656...............&...................203.............33.$430..................731...........
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......805-...-..........598...........#.............351........34.........682..516.534..............*........&..........................283.
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.662..................*..............@939...........................204........484....34....99.............@.................350.54.........
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..........338........=.............$.................*....94....................................*...546.....$.......187..593.768........282.
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.....881.../...491...903..........918.....303......................*........578*...................807......597................681.539......
......*.................*.463.467*....246.......577.....198.....245.....967.....988.&.........759.......=...*.........-889..................
......462..978........664...%...........*.-731.../.....&....375.............#.......217........@........381.250...219......947..............
..........&..........................252.......%.............*..............258............427...137...............@........@....-175.......
....864...................461..................234.......69.222........*...........411....=............651...#..............................
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.916......%.........629.................911*238...........680...239................672.............137@...469.........*.......737...@.......
..............764....*........894/..289...........944..........#...........@....%........../876..........*.........687.........*....436.....
......442.255.....442..903.............*.....*493..../......................338..346...................927..............764.....536.........
.........*.....*........*.....869*888.597.241..................11-....542#...........412*..................235..............................
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....*.....=................+.........76..328.....803.....658.....254.............327..........340......*.............@......................
...........254........../...........*...*...........*234...%..........20.....238...*..........*.........380......&......78.246%...598.......
.96....990.........%..718...%....869.......596....*......................423.....433..93.....613....$.............905...=........*.....497..
...*....*........=.86.....499..............*...385.296...................*...........*...............523.$.....................529...$.*....
...780.685.....822....................560.35.............................529......780.....................453......................711..930.

:ok

defmodule Day03 do
  def parse_line("", {_, _, acc}), do: acc
  def parse_line("." <> rest, {x, y, acc}), do: parse_line(rest, {x + 1, y, acc})

  def parse_line(<<c>> <> _ = str, {x, y, items}) when c in ?0..?9 do
    {num, rest} = Integer.parse(str)
    len = floor(:math.log10(num) + 1)
    ref = make_ref()

    points =
      for i <- 0..(len - 1) do
        {{x + i, y}, {ref, num}}
      end

    parse_line(rest, {x + len, y, points ++ items})
  end

  def parse_line(<<c>> <> rest, {x, y, items}) do
    parse_line(rest, {x + 1, y, [{{x, y}, <<c>>} | items]})
  end

  def around({x, y}) do
    for dx <- -1..1, dy <- -1..1, do: {x + dx, y + dy}
  end
end

grid =
  puzzle_input
  |> String.split()
  |> Enum.with_index()
  |> Enum.flat_map(fn {line, y} ->
    Day03.parse_line(line, {0, y, []})
  end)

{parts, ids} =
  grid
  |> Enum.split_with(fn {_, value} ->
    is_binary(value)
  end)

parts = Map.new(parts)
ids = Map.new(ids)

%{
  {77, 129} => {#Reference<0.209765579.1433141249.123990>, 581},
  {120, 47} => {#Reference<0.209765579.1433141249.123295>, 894},
  {4, 5} => {#Reference<0.209765579.1433141249.122921>, 229},
  {78, 98} => {#Reference<0.209765579.1433141249.123728>, 245},
  {29, 25} => {#Reference<0.209765579.1433141249.123095>, 7},
  {4, 81} => {#Reference<0.209765579.1433141249.123572>, 135},
  {121, 77} => {#Reference<0.209765579.1433141249.123544>, 762},
  {119, 60} => {#Reference<0.209765579.1433141249.123401>, 292},
  {111, 108} => {#Reference<0.209765579.1433141249.123813>, 175},
  {78, 75} => {#Reference<0.209765579.1433141249.123526>, 497},
  {58, 84} => {#Reference<0.209765579.1433141249.123603>, 572},
  {58, 33} => {#Reference<0.209765579.1433141249.123159>, 687},
  {13, 55} => {#Reference<0.209765579.1433141249.123356>, 764},
  {91, 38} => {#Reference<0.209765579.1433141249.123211>, 846},
  {9, 58} => {#Reference<0.209765579.1433141249.123378>, 960},
  {25, 87} => {#Reference<0.209765579.1433141249.123628>, 60},
  {21, 97} => {#Reference<0.209765579.1433141249.123717>, 721},
  {126, 48} => {#Reference<0.209765579.1433141249.123304>, 993},
  {26, 82} => {#Reference<0.209765579.1433141249.123584>, 180},
  {22, 36} => {#Reference<0.209765579.1433141249.123185>, 62},
  {79, 81} => {#Reference<0.209765579.1433141249.123577>, 797},
  {65, 55} => {#Reference<0.209765579.1433141249.123358>, 856},
  {99, 39} => {#Reference<0.209765579.1433141249.123220>, 756},
  {52, 42} => {#Reference<0.209765579.1433141249.123245>, 180},
  {120, 77} => {#Reference<0.209765579.1433141249.123544>, 762},
  {133, 57} => {#Reference<0.209765579.1433141249.123377>, 765},
  {68, 81} => {#Reference<0.209765579.1433141249.123576>, 46},
  {22, 103} => {#Reference<0.209765579.1433141249.123768>, 361},
  {44, 93} => {#Reference<0.209765579.1433141249.123687>, 65},
  {87, 32} => {#Reference<0.209765579.1433141249.123151>, 110},
  {81, 37} => {#Reference<0.209765579.1433141249.123201>, 382},
  {111, 25} => {#Reference<0.209765579.1433141249.123099>, 275},
  {98, 0} => {#Reference<0.209765579.1433141249.122882>, 6},
  {110, 80} => {#Reference<0.209765579.1433141249.123570>, 591},
  {19, 138} => {#Reference<0.209765579.1433141249.124066>, 86},
  {88, 62} => {#Reference<0.209765579.1433141249.123415>, 673},
  {37, 15} => {#Reference<0.209765579.1433141249.123010>, 952},
  {65, 44} => {#Reference<0.209765579.1433141249.123266>, 912},
  {28, 20} => {#Reference<0.209765579.1433141249.123049>, 397},
  {10, 32} => {#Reference<0.209765579.1433141249.123149>, 522},
  {101, 87} => {#Reference<0.209765579.1433141249.123637>, 937},
  {87, 2} => {#Reference<0.209765579.1433141249.122897>, 890},
  {46, 108} => {#Reference<0.209765579.1433141249.123810>, 281},
  {82, 139} => {#Reference<0.209765579.1433141249.124078>, 780},
  {137, 104} => {#Reference<0.209765579.1433141249.123789>, 780},
  {82, 100} => {#Reference<0.209765579.1433141249.123745>, 710},
  {127, 130} => {#Reference<0.209765579.1433141249.124003>, 737},
  {45, 130} => {#Reference<0.209765579.1433141249.123997>, 238},
  {70, ...} => {#Reference<0.209765579.1433141249.123447>, ...},
  {...} => {...},
  ...
}

used_parts =
  for {xy, _} <- parts,
      dxy <- Day03.around(xy),
      {:ok, val} <- [Map.fetch(ids, dxy)],
      into: %{},
      do: val

Enum.sum(Map.values(used_parts))

540025

cogs =
  for {xy, "*"} <- parts,
      values =
        Map.take(ids, Day03.around(xy)) |> Map.values() |> Enum.uniq() |> Enum.map(&elem(&1, 1)),
      match?([_, _], values),
      do: Enum.product(values)

Enum.sum(cogs)

84584891