Day 3 part 2

2023/rust/src/day3.rs

@@ -80,7 +80,23 @@ impl AoCSolution for Day3 {
     }
 
     fn part2(input: Self::Input) -> Self::Solution {
-        0
+        let mut result = 0;
+        let chargrid: Vec<Vec<char>> = input.lines().map(|s| s.chars().collect()).collect();
+        println!("{chargrid:?}");
+        for y in 0..chargrid.len() {
+            let line = &chargrid[y];
+            for x in 0..line.len() {
+                let c = line[x];
+                if c == '*' {
+                    let nums = Self::adjacent_nums(&chargrid, y, x);
+                    println!("nums: {nums:?}");
+                    if nums.len() == 2 {
+                        result += nums[0] * nums[1];
+                    }
+                }
+            }
+        }
+        result
     }
 }
 
@@ -102,6 +118,6 @@ mod tests {
 .664.598.."#;
         println!("input:\n{input}");
         assert_eq!(Day3::part1(input.into()), 4361);
-        assert_eq!(Day3::part2(input.into()), 0);
+        assert_eq!(Day3::part2(input.into()), 467835);
     }
 }