2 files changed, 87 insertions, 0 deletions

diff --git a/day3/Cargo.toml b/day3/Cargo.toml
new file mode 100644
index 0000000..cabf6e3
--- /dev/null
+++ b/day3/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day3"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+aoc = { path = "../aoc" }
+regex = "1.11.1"
\ No newline at end of file
diff --git a/day3/src/main.rs b/day3/src/main.rs
new file mode 100644
index 0000000..86ba39b
--- /dev/null
+++ b/day3/src/main.rs
@@ -0,0 +1,79 @@
+
+use aoc;
+use std::io::{BufReader, Read};
+use aoc::Day;
+use regex::Regex;
+
+struct Day3 {}
+
+impl Day for Day3 {
+    fn example_input(&self) -> &'static str {
+        r#"
+            xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))
+        "#.trim()
+    }
+
+    fn example_input_part_2(&self) -> &'static str {
+        r#"
+            xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))
+        "#.trim()
+    }
+
+    fn example_result_part_1(&self) -> &'static str {
+        "161"
+    }
+
+    fn example_result_part_2(&self) -> &'static str {
+        "48"
+    }
+
+    fn part_1(&self, input: BufReader<Box<dyn Read>>) -> String {
+        let code = self.read_lines(input).iter().map(|l| l.trim()).collect::<Vec<&str>>().join("");
+        let re = Regex::new(r"mul\((?P<a>\d+),(?P<b>\d+)\)").unwrap();
+        re
+            .captures_iter(&code)
+            .map(|c| {
+                c.name("a").unwrap().as_str().parse::<u32>().unwrap() * c.name("b").unwrap().as_str().parse::<u32>().unwrap()
+            })
+            .sum::<u32>()
+            .to_string()
+    }
+
+    fn part_2(&self, input: BufReader<Box<dyn Read>>) -> String {
+        let code = self.read_lines(input).iter().map(|l| l.trim()).collect::<Vec<&str>>().join("");
+        println!("{}", code);
+
+        let mut mul = true;
+        let re = Regex::new(r"mul\((?P<a>\d+),(?P<b>\d+)\)|(?P<enable>do)\(\)|(?P<disable>don't)\(\)").unwrap();
+        re
+            .captures_iter(&code)
+            .map(|c| {
+
+                if c.name("enable") != None {
+                    mul = true;
+                } else if c.name("disable") != None {
+                    mul = false;
+                } else if mul {
+                    return c.name("a").unwrap().as_str().parse::<u32>().unwrap() * c.name("b").unwrap().as_str().parse::<u32>().unwrap();
+                }
+
+                0
+            })
+            .sum::<u32>()
+            .to_string()
+    }
+}
+
+
+fn main() {
+    aoc::main(&Day3 {});
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_day3() {
+        aoc::test_day(&Day3 {});
+    }
+}