From ef0b86dbfb17bfdea9d37016c950b254619069ca Mon Sep 17 00:00:00 2001
From: sloane <git@sloanelybutsurely.com>
Date: Tue, 3 Dec 2024 07:50:45 -0500
Subject: [PATCH] solve 2024 day 3

---
 2024/README.md     |  3 +-
 2024/lib/2024/3.ex | 76 ++++++++++++++++++++++++++++++++++++++++++++++
 2024/mix.exs       |  1 +
 2024/mix.lock      |  1 +
 README.md          |  4 +--
 5 files changed, 82 insertions(+), 3 deletions(-)
 create mode 100644 2024/lib/2024/3.ex

diff --git a/2024/README.md b/2024/README.md
index 195afbe..88d41bf 100644
--- a/2024/README.md
+++ b/2024/README.md
@@ -2,10 +2,11 @@
 
 |  S  |  M  |  T  |  W  |  T  |  F  |  S  |
 | :-: | :-: | :-: | :-: | :-: | :-: | :-: |
-| [1] | [2] |   3 |   4 |   5 |   6 |   7 |
+| [1] | [2] | [3] |   4 |   5 |   6 |   7 |
 |   8 |   9 |  10 |  11 |  12 |  13 |  14 |
 |  15 |  16 |  17 |  18 |  19 |  20 |  21 |
 |  22 |  23 |  24 |  25 |     |     |     |
 
 [1]: ./lib/2024/1.ex
 [2]: ./lib/2024/2.ex
+[3]: ./lib/2024/3.ex
diff --git a/2024/lib/2024/3.ex b/2024/lib/2024/3.ex
new file mode 100644
index 0000000..679f15d
--- /dev/null
+++ b/2024/lib/2024/3.ex
@@ -0,0 +1,76 @@
+import AOC
+
+aoc 2024, 3 do
+  import NimbleParsec
+
+  def p1(input) do
+    input
+    |> read_progam()
+    |> Enum.map(&eval/1)
+    |> Enum.sum()
+  end
+
+  def p2(input) do
+    {answer, _} =
+      input
+      |> read_progam()
+      |> Enum.reduce({0, :do}, fn
+        {:dont, _}, {sum, _} -> {sum, :dont}
+        {:do, _}, {sum, _} -> {sum, :do}
+        _inst, {_sum, :dont} = acc -> acc
+        inst, {sum, :do} -> {sum + eval(inst), :do}
+      end)
+
+    answer
+  end
+
+  defcombinatorp(
+    :mul,
+    "mul("
+    |> string()
+    |> ignore()
+    |> integer(min: 1)
+    |> ignore(string(","))
+    |> integer(min: 1)
+    |> ignore(string(")"))
+    |> tag(:mul)
+  )
+
+  defcombinatorp(
+    :do,
+    "do()"
+    |> string()
+    |> ignore()
+    |> tag(:do)
+  )
+
+  defcombinatorp(
+    :dont,
+    "don't()"
+    |> string()
+    |> ignore()
+    |> tag(:dont)
+  )
+
+  defparsecp(
+    :program_parsec,
+    [
+      parsec(:mul),
+      parsec(:do),
+      parsec(:dont)
+    ]
+    |> choice()
+    |> eventually()
+    |> repeat()
+  )
+
+  def read_progam(input) do
+    {:ok, program, _rest, _, _, _} = program_parsec(input)
+
+    program
+  end
+
+  defp eval({:mul, [a, b]}), do: a * b
+  defp eval({:do, _}), do: 0
+  defp eval({:dont, _}), do: 0
+end
diff --git a/2024/mix.exs b/2024/mix.exs
index ff15d14..ddbeada 100644
--- a/2024/mix.exs
+++ b/2024/mix.exs
@@ -22,6 +22,7 @@ defmodule Aoc2024.MixProject do
   defp deps do
     [
       {:advent_of_code_utils, "~> 4.0"},
+      {:nimble_parsec, "~> 1.4"},
       {:styler, "~> 1.2", only: [:dev, :test], runtime: false}
     ]
   end
diff --git a/2024/mix.lock b/2024/mix.lock
index d127457..410e89f 100644
--- a/2024/mix.lock
+++ b/2024/mix.lock
@@ -1,6 +1,7 @@
 %{
   "advent_of_code_utils": {:hex, :advent_of_code_utils, "4.0.1", "591073a49600cbceae6d92e0fb2d2c56b59f6d383851e2a7c00c3bf0e4f33f4f", [:mix], [{:floki, "~> 0.34", [hex: :floki, repo: "hexpm", optional: false]}, {:tz, "~> 0.26", [hex: :tz, repo: "hexpm", optional: false]}], "hexpm", "684d016883d7b5443d9d22abc34013fb6f1d5d9ff114859a40890545a570eec8"},
   "floki": {:hex, :floki, "0.36.3", "1102f93b16a55bc5383b85ae3ec470f82dee056eaeff9195e8afdf0ef2a43c30", [:mix], [], "hexpm", "fe0158bff509e407735f6d40b3ee0d7deb47f3f3ee7c6c182ad28599f9f6b27a"},
+  "nimble_parsec": {:hex, :nimble_parsec, "1.4.0", "51f9b613ea62cfa97b25ccc2c1b4216e81df970acd8e16e8d1bdc58fef21370d", [:mix], [], "hexpm", "9c565862810fb383e9838c1dd2d7d2c437b3d13b267414ba6af33e50d2d1cf28"},
   "styler": {:hex, :styler, "1.2.1", "28f9e3d4b065c22575c56b8ae03d05188add1b21bec5ae664fc1551e2dfcc41b", [:mix], [], "hexpm", "71dc33980e530d21ca54db9c2075e646faa6e7b744a9d4a3dfb0ff01f56595f0"},
   "tz": {:hex, :tz, "0.28.1", "717f5ffddfd1e475e2a233e221dc0b4b76c35c4b3650b060c8e3ba29dd6632e9", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:mint, "~> 1.6", [hex: :mint, repo: "hexpm", optional: true]}], "hexpm", "bfdca1aa1902643c6c43b77c1fb0cb3d744fd2f09a8a98405468afdee0848c8a"},
 }
diff --git a/README.md b/README.md
index 3d25c55..7e678ac 100644
--- a/README.md
+++ b/README.md
@@ -15,8 +15,8 @@
 | [2021] | **43/50** 🌟 | Elixir |
 | [2022] | **14/50** 🌟 | Elixir, Haskell |
 | [2023] | **19/50** 🌟 | Elixir, Haskell |
-| [2024] | **4/50** 🌟  | Elixir |
-| **Total** | **160** 🌟 | |
+| [2024] | **6/50** 🌟  | Elixir |
+| **Total** | **162** 🌟 | |
 
 [2015]: ./2015
 [2017]: ./2017