From 27a646f88fbedfaafe8e7cab31d982aa68b6b75f Mon Sep 17 00:00:00 2001
From: Luke Else <mail@luke-else.co.uk>
Date: Sun, 3 Dec 2023 08:39:30 +0000
Subject: [PATCH] Day 3 part 2... My struggle in the first half made the second
 half bliss!

---
 src/solutions/day03.rs | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/solutions/day03.rs b/src/solutions/day03.rs
index 0f24cee..dd10a45 100644
--- a/src/solutions/day03.rs
+++ b/src/solutions/day03.rs
@@ -22,9 +22,21 @@ impl Solution for Day03 {
 
     fn part2(
         &self,
-        _input: &mut Vec<String>,
+        input: &mut Vec<String>,
     ) -> Result<Box<dyn std::fmt::Display>, Box<dyn std::error::Error>> {
-        Ok(Box::new("Ready"))
+        // Get data into a byte array
+        let lines = input.iter().map(|s| s.as_bytes()).collect::<Vec<_>>();
+        let mut symbols: HashMap<(usize, usize, char), Vec<usize>> = HashMap::new();
+
+        // Get the valid numbers from the input
+        self.map_valid_nums(&lines, &mut symbols)?;
+
+        let ans: usize = symbols
+            .iter()
+            .filter(|(&(_, _, s), v)| s == '*' && v.len() == 2)
+            .map(|(_, v)| v[0] * v[1])
+            .sum();
+        Ok(Box::new(ans))
     }
 
     fn get_day(&self) -> u8 {
@@ -124,6 +136,6 @@ mod test {
             .unwrap()
             .to_string();
 
-        assert_eq!(answer, "Ready");
+        assert_eq!(answer, "467835");
     }
 }