diff --git a/src/bin/2024_12/main.rs b/src/bin/2024_12/main.rs
new file mode 100644
index 0000000..060135b
--- /dev/null
+++ b/src/bin/2024_12/main.rs
@@ -0,0 +1,153 @@
+use aoc::{common, grid::Grid};
+
+fn score(
+    farm: &Grid<char>,
+    pos: &(usize, usize),
+    visited: &mut Vec<(usize, usize)>,
+) -> (usize, usize, usize) {
+    let mut area = 0;
+    let mut peri = 0;
+    let mut sides = 0;
+
+    if visited.contains(pos) {
+        return (area, peri, sides);
+    }
+
+    let mut q = Vec::new();
+    q.push(*pos);
+    let mut cluster = Vec::new();
+
+    while let Some(tp) = q.pop() {
+        if cluster.contains(&tp) {
+            continue;
+        }
+        cluster.push(tp);
+        let adj: Vec<(usize, usize)> = farm
+            .adjacent_4(&tp)
+            .into_iter()
+            .filter(|i| farm.get(i) == farm.get(&tp))
+            .collect();
+        for nx in adj {
+            q.push(nx);
+        }
+    }
+
+    //println!("Plant {} got {} area.", farm.get(pos), cluster.len());
+    for c in cluster.iter() {
+        visited.push(*c);
+    }
+
+    area = cluster.len();
+    peri = area * 4;
+
+    let mut corners_map: Grid<usize> = Grid::new(farm.rows + 1, farm.cols + 1, 0);
+
+    for c in cluster.iter() {
+        let val = corners_map.get(c);
+        corners_map.set(c, val + 1);
+
+        let val = corners_map.get(&(c.0, c.1 + 1));
+        corners_map.set(&(c.0, c.1 + 1), val + 1);
+
+        let val = corners_map.get(&(c.0 + 1, c.1 + 1));
+        corners_map.set(&(c.0 + 1, c.1 + 1), val + 1);
+
+        let val = corners_map.get(&(c.0 + 1, c.1));
+        corners_map.set(&(c.0 + 1, c.1), val + 1);
+
+        peri -= farm
+            .adjacent_4(c)
+            .iter()
+            .filter(|x| cluster.contains(x))
+            .count();
+    }
+
+    //corners_map.print();
+
+    for i in 0..corners_map.rows {
+        for j in 0..corners_map.cols {
+            if corners_map.get(&(i, j)) % 2 == 1 {
+                sides += 1;
+            }
+            if corners_map.get(&(i, j)) == 2 {
+                if i == 0 || i == corners_map.rows - 1 {
+                    continue;
+                }
+                if j == 0 || j == corners_map.cols - 1 {
+                    continue;
+                }
+
+                let mut found = false;
+                if farm.get(&(i - 1, j)) == farm.get(&(i - 1, j - 1)) {
+                    found = true;
+                }
+                if farm.get(&(i, j - 1)) == farm.get(&(i - 1, j - 1)) {
+                    found = true;
+                }
+                if farm.get(&(i - 1, j)) == farm.get(&(i, j)) {
+                    found = true;
+                }
+                if farm.get(&(i, j - 1)) == farm.get(&(i, j)) {
+                    found = true;
+                }
+
+                if !found {
+                    //println!("Inc sides at pos {i},{j}");
+                    sides += 2;
+                }
+            }
+        }
+    }
+
+    (area, peri, sides)
+}
+
+fn solve<const PART: usize>(input: &str) -> usize {
+    let mut ans = 0;
+    let farm = Grid::from_str(input, |c| c);
+    let mut visited: Vec<(usize, usize)> = Vec::new();
+    for p in 'A'..='Z' {
+        let pos = farm.positions(p);
+
+        if pos.is_empty() {
+            continue;
+        }
+
+        for pp in pos.iter() {
+            let (area, peri, sides) = score(&farm, pp, &mut visited);
+            ans += if PART == 1 { area * peri } else { area * sides };
+        }
+    }
+    ans
+}
+
+fn main() {
+    let input = common::get_input();
+    println!("{input:?}");
+    common::timed(&input, solve::<1>, true);
+    common::timed(&input, solve::<2>, false);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_samples() {
+        let sample_input = "RRRRIICCFF\nRRRRIICCCF\nVVRRRCCFFF\nVVRCCCJFFF\nVVVVCJJCFE\nVVIVCCJJEE\nVVIIICJJEE\nMIIIIIJJEE\nMIIISIJEEE\nMMMISSJEEE";
+        assert_eq!(solve::<1>(sample_input), 1930);
+        assert_eq!(solve::<2>(sample_input), 1206);
+        let sample_input = "AAAA\nBBCD\nBBCC\nEEEC";
+        assert_eq!(solve::<1>(sample_input), 140);
+        assert_eq!(solve::<2>(sample_input), 80);
+        let sample_input = "AAAAAA\nAAABBA\nAAABBA\nABBAAA\nABBAAA\nAAAAAA";
+        assert_eq!(solve::<1>(sample_input), 1184);
+        assert_eq!(solve::<2>(sample_input), 368);
+        let sample_input = "OOOOO\nOXOXO\nOOOOO\nOXOXO\nOOOOO";
+        assert_eq!(solve::<1>(sample_input), 772);
+        assert_eq!(solve::<2>(sample_input), 436);
+        let sample_input = "EEEEE\nEXXXX\nEEEEE\nEXXXX\nEEEEE";
+        assert_eq!(solve::<1>(sample_input), 692);
+        assert_eq!(solve::<2>(sample_input), 236);
+    }
+}