From 70b2cf2086d4af9478f31135d48653192b3d31c2 Mon Sep 17 00:00:00 2001
From: "Ruidy (aider)" <ruidy.nemausat@gmail.com>
Date: Tue, 3 Dec 2024 14:03:20 +0100
Subject: [PATCH] feat: Implement mul() instruction parsing and summation for
 Day 3

---
 lib/advent_code2024/solutions/day03/day3.ex | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/lib/advent_code2024/solutions/day03/day3.ex b/lib/advent_code2024/solutions/day03/day3.ex
index 6e3ec72..e5b13d9 100644
--- a/lib/advent_code2024/solutions/day03/day3.ex
+++ b/lib/advent_code2024/solutions/day03/day3.ex
@@ -47,8 +47,17 @@ defmodule AdventCode2024.Solutions.Day03 do
 
   defp solve_content(""), do: {:error, :no_input}
   defp solve_content(content) when is_binary(content) and content != "" do
-    # TODO: Implement solution for part 1
-    {:ok, 0}
+    result =
+      ~r/mul\((\d{1,3}),(\d{1,3})\)/
+      |> Regex.scan(content, capture: :all_but_first)
+      |> Enum.map(fn [x, y] -> 
+        {x_int, _} = Integer.parse(x)
+        {y_int, _} = Integer.parse(y)
+        x_int * y_int
+      end)
+      |> Enum.sum()
+
+    {:ok, result}
   end
 
   defp solve_part2_content(""), do: {:error, :no_input}