From d9363b9aa8e03a4643effa6cd95892ef76b955dd Mon Sep 17 00:00:00 2001
From: Varun Ramakrishnan <ravarun3@gmail.com>
Date: Wed, 4 Dec 2024 00:46:30 -0500
Subject: [PATCH] Solve Day 3 Part 1

---
 data/examples/03.txt |  1 +
 src/bin/03.rs        | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 data/examples/03.txt
 create mode 100644 src/bin/03.rs

diff --git a/data/examples/03.txt b/data/examples/03.txt
new file mode 100644
index 0000000..f274bda
--- /dev/null
+++ b/data/examples/03.txt
@@ -0,0 +1 @@
+xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))
diff --git a/src/bin/03.rs b/src/bin/03.rs
new file mode 100644
index 0000000..ef401e9
--- /dev/null
+++ b/src/bin/03.rs
@@ -0,0 +1,38 @@
+advent_of_code::solution!(3);
+
+use regex::Regex;
+
+pub fn part_one(input: &str) -> Option<u32> {
+    let re = Regex::new(r"mul\((\d+),(\d+)\)").unwrap();
+    let result = re
+        .captures_iter(input)
+        .filter_map(|x| {
+            let first = x[1].parse::<u32>().ok()?;
+            let second = x[2].parse::<u32>().ok()?;
+            Some(first * second)
+        })
+        .sum();
+
+    Some(result)
+}
+
+pub fn part_two(input: &str) -> Option<u32> {
+    None
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part_one() {
+        let result = part_one(&advent_of_code::template::read_file("examples", DAY));
+        assert_eq!(result, Some(161));
+    }
+
+    #[test]
+    fn test_part_two() {
+        let result = part_two(&advent_of_code::template::read_file("examples", DAY));
+        assert_eq!(result, None);
+    }
+}