day 23

4 files changed, 1893 insertions, 0 deletions

diff --git a/data/2021/23.txt b/data/2021/23.txt
new file mode 100644
index 0000000..3d20443
--- /dev/null
+++ b/data/2021/23.txt
@@ -0,0 +1,5 @@
+#############
+#...........#
+###B#B#D#D###
+  #C#A#A#C#
+  #########
diff --git a/examples/2021_23_generate_connectivity.rs b/examples/2021_23_generate_connectivity.rs
new file mode 100644
index 0000000..6f02da6
--- /dev/null
+++ b/examples/2021_23_generate_connectivity.rs
@@ -0,0 +1,122 @@
+// #############
+// #abcdefghijk#
+// ###l#m#n#o###
+//   #p#q#r#s#
+//   #########
+static NEIGHBORS1: &[&[usize]] = &[
+    &[1],
+    &[0, 2],
+    &[1, 3, 11],
+    &[2, 4],
+    &[3, 5, 12],
+    &[4, 6],
+    &[5, 7, 13],
+    &[6, 8],
+    &[7, 9, 14],
+    &[8, 10],
+    &[9],
+    &[2, 15],
+    &[4, 16],
+    &[6, 17],
+    &[8, 18],
+    &[11],
+    &[12],
+    &[13],
+    &[14],
+];
+
+// #############
+// #abcdefghijk#
+// ###l#m#n#o###
+//   #p#q#r#s#
+//   #t#u#v#w#
+//   #x#y#z#!#
+//   #########
+static NEIGHBORS2: &[&[usize]] = &[
+    &[1],
+    &[0, 2],
+    &[1, 3, 11],
+    &[2, 4],
+    &[3, 5, 12],
+    &[4, 6],
+    &[5, 7, 13],
+    &[6, 8],
+    &[7, 9, 14],
+    &[8, 10],
+    &[9],
+    &[2, 15],
+    &[4, 16],
+    &[6, 17],
+    &[8, 18],
+    &[11, 19],
+    &[12, 20],
+    &[13, 21],
+    &[14, 22],
+    &[15, 23],
+    &[16, 24],
+    &[17, 25],
+    &[18, 26],
+    &[19],
+    &[20],
+    &[21],
+    &[22],
+];
+
+fn path_rec(
+    neighbors: &[&[usize]],
+    from: usize,
+    to: usize,
+    path: &mut Vec<usize>,
+) -> bool {
+    if from == to {
+        return true;
+    }
+    for neighbor in neighbors[from] {
+        if path.contains(neighbor) {
+            continue;
+        }
+        path.push(*neighbor);
+        if path_rec(neighbors, *neighbor, to, path) {
+            return true;
+        }
+        path.pop();
+    }
+    false
+}
+
+fn path(neighbors: &[&[usize]], from: usize, to: usize) -> Vec<usize> {
+    let mut path = vec![from];
+    if !path_rec(neighbors, from, to, &mut path) {
+        panic!("no path found from {} to {}", from, to);
+    }
+    path.remove(0);
+    path
+}
+
+fn main() {
+    println!("static CONNECTIVITY1: &[&[&[usize]]] = &[");
+    for from in 0..19 {
+        println!("    &[");
+        for to in 0..19 {
+            let path = path(NEIGHBORS1, from, to);
+            let path_strs: Vec<_> =
+                path.iter().map(|i| i.to_string()).collect();
+            println!("        &[{}],", path_strs.join(", "));
+        }
+        println!("    ],");
+    }
+    println!("];");
+    println!();
+    println!("static CONNECTIVITY2: &[&[&[usize]]] = &[");
+    for from in 0..27 {
+        println!("    &[");
+        for to in 0..27 {
+            let path = path(NEIGHBORS2, from, to);
+            let path_strs: Vec<_> =
+                path.iter().map(|i| i.to_string()).collect();
+            println!("        &[{}],", path_strs.join(", "));
+        }
+        println!("    ],");
+    }
+    println!("];");
+}
diff --git a/src/2021/23/mod.rs b/src/2021/23/mod.rs
new file mode 100644
index 0000000..f5b64a0
--- /dev/null
+++ b/src/2021/23/mod.rs
@@ -0,0 +1,1762 @@
+use crate::prelude::*;
+
+static CONNECTIVITY1: &[&[&[usize]]] = &[
+    &[
+        &[],
+        &[1],
+        &[1, 2],
+        &[1, 2, 3],
+        &[1, 2, 3, 4],
+        &[1, 2, 3, 4, 5],
+        &[1, 2, 3, 4, 5, 6],
+        &[1, 2, 3, 4, 5, 6, 7],
+        &[1, 2, 3, 4, 5, 6, 7, 8],
+        &[1, 2, 3, 4, 5, 6, 7, 8, 9],
+        &[1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
+        &[1, 2, 11],
+        &[1, 2, 3, 4, 12],
+        &[1, 2, 3, 4, 5, 6, 13],
+        &[1, 2, 3, 4, 5, 6, 7, 8, 14],
+        &[1, 2, 11, 15],
+        &[1, 2, 3, 4, 12, 16],
+        &[1, 2, 3, 4, 5, 6, 13, 17],
+        &[1, 2, 3, 4, 5, 6, 7, 8, 14, 18],
+    ],
+    &[
+        &[0],
+        &[],
+        &[2],
+        &[2, 3],
+        &[2, 3, 4],
+        &[2, 3, 4, 5],
+        &[2, 3, 4, 5, 6],
+        &[2, 3, 4, 5, 6, 7],
+        &[2, 3, 4, 5, 6, 7, 8],
+        &[2, 3, 4, 5, 6, 7, 8, 9],
+        &[2, 3, 4, 5, 6, 7, 8, 9, 10],
+        &[2, 11],
+        &[2, 3, 4, 12],
+        &[2, 3, 4, 5, 6, 13],
+        &[2, 3, 4, 5, 6, 7, 8, 14],
+        &[2, 11, 15],
+        &[2, 3, 4, 12, 16],
+        &[2, 3, 4, 5, 6, 13, 17],
+        &[2, 3, 4, 5, 6, 7, 8, 14, 18],
+    ],
+    &[
+        &[1, 0],
+        &[1],
+        &[],
+        &[3],
+        &[3, 4],
+        &[3, 4, 5],
+        &[3, 4, 5, 6],
+        &[3, 4, 5, 6, 7],
+        &[3, 4, 5, 6, 7, 8],
+        &[3, 4, 5, 6, 7, 8, 9],
+        &[3, 4, 5, 6, 7, 8, 9, 10],
+        &[11],
+        &[3, 4, 12],
+        &[3, 4, 5, 6, 13],
+        &[3, 4, 5, 6, 7, 8, 14],
+        &[11, 15],
+        &[3, 4, 12, 16],
+        &[3, 4, 5, 6, 13, 17],
+        &[3, 4, 5, 6, 7, 8, 14, 18],
+    ],
+    &[
+        &[2, 1, 0],
+        &[2, 1],
+        &[2],
+        &[],
+        &[4],
+        &[4, 5],
+        &[4, 5, 6],
+        &[4, 5, 6, 7],
+        &[4, 5, 6, 7, 8],
+        &[4, 5, 6, 7, 8, 9],
+        &[4, 5, 6, 7, 8, 9, 10],
+        &[2, 11],
+        &[4, 12],
+        &[4, 5, 6, 13],
+        &[4, 5, 6, 7, 8, 14],
+        &[2, 11, 15],
+        &[4, 12, 16],
+        &[4, 5, 6, 13, 17],
+        &[4, 5, 6, 7, 8, 14, 18],
+    ],
+    &[
+        &[3, 2, 1, 0],
+        &[3, 2, 1],
+        &[3, 2],
+        &[3],
+        &[],
+        &[5],
+        &[5, 6],
+        &[5, 6, 7],
+        &[5, 6, 7, 8],
+        &[5, 6, 7, 8, 9],
+        &[5, 6, 7, 8, 9, 10],
+        &[3, 2, 11],
+        &[12],
+        &[5, 6, 13],
+        &[5, 6, 7, 8, 14],
+        &[3, 2, 11, 15],
+        &[12, 16],
+        &[5, 6, 13, 17],
+        &[5, 6, 7, 8, 14, 18],
+    ],
+    &[
+        &[4, 3, 2, 1, 0],
+        &[4, 3, 2, 1],
+        &[4, 3, 2],
+        &[4, 3],
+        &[4],
+        &[],
+        &[6],
+        &[6, 7],
+        &[6, 7, 8],
+        &[6, 7, 8, 9],
+        &[6, 7, 8, 9, 10],
+        &[4, 3, 2, 11],
+        &[4, 12],
+        &[6, 13],
+        &[6, 7, 8, 14],
+        &[4, 3, 2, 11, 15],
+        &[4, 12, 16],
+        &[6, 13, 17],
+        &[6, 7, 8, 14, 18],
+    ],
+    &[
+        &[5, 4, 3, 2, 1, 0],
+        &[5, 4, 3, 2, 1],
+        &[5, 4, 3, 2],
+        &[5, 4, 3],
+        &[5, 4],
+        &[5],
+        &[],
+        &[7],
+        &[7, 8],
+        &[7, 8, 9],
+        &[7, 8, 9, 10],
+        &[5, 4, 3, 2, 11],
+        &[5, 4, 12],
+        &[13],
+        &[7, 8, 14],
+        &[5, 4, 3, 2, 11, 15],
+        &[5, 4, 12, 16],
+        &[13, 17],
+        &[7, 8, 14, 18],
+    ],
+    &[
+        &[6, 5, 4, 3, 2, 1, 0],
+        &[6, 5, 4, 3, 2, 1],
+        &[6, 5, 4, 3, 2],
+        &[6, 5, 4, 3],
+        &[6, 5, 4],
+        &[6, 5],
+        &[6],
+        &[],
+        &[8],
+        &[8, 9],
+        &[8, 9, 10],
+        &[6, 5, 4, 3, 2, 11],
+        &[6, 5, 4, 12],
+        &[6, 13],
+        &[8, 14],
+        &[6, 5, 4, 3, 2, 11, 15],
+        &[6, 5, 4, 12, 16],
+        &[6, 13, 17],
+        &[8, 14, 18],
+    ],
+    &[
+        &[7, 6, 5, 4, 3, 2, 1, 0],
+        &[7, 6, 5, 4, 3, 2, 1],
+        &[7, 6, 5, 4, 3, 2],
+        &[7, 6, 5, 4, 3],
+        &[7, 6, 5, 4],
+        &[7, 6, 5],
+        &[7, 6],
+        &[7],
+        &[],
+        &[9],
+        &[9, 10],
+        &[7, 6, 5, 4, 3, 2, 11],
+        &[7, 6, 5, 4, 12],
+        &[7, 6, 13],
+        &[14],
+        &[7, 6, 5, 4, 3, 2, 11, 15],
+        &[7, 6, 5, 4, 12, 16],
+        &[7, 6, 13, 17],
+        &[14, 18],
+    ],
+    &[
+        &[8, 7, 6, 5, 4, 3, 2, 1, 0],
+        &[8, 7, 6, 5, 4, 3, 2, 1],
+        &[8, 7, 6, 5, 4, 3, 2],
+        &[8, 7, 6, 5, 4, 3],
+        &[8, 7, 6, 5, 4],
+        &[8, 7, 6, 5],
+        &[8, 7, 6],
+        &[8, 7],
+        &[8],
+        &[],
+        &[10],
+        &[8, 7, 6, 5, 4, 3, 2, 11],
+        &[8, 7, 6, 5, 4, 12],
+        &[8, 7, 6, 13],
+        &[8, 14],
+        &[8, 7, 6, 5, 4, 3, 2, 11, 15],
+        &[8, 7, 6, 5, 4, 12, 16],
+        &[8, 7, 6, 13, 17],
+        &[8, 14, 18],
+    ],
+    &[
+        &[9, 8, 7, 6, 5, 4, 3, 2, 1, 0],
+        &[9, 8, 7, 6, 5, 4, 3, 2, 1],
+        &[9, 8, 7, 6, 5, 4, 3, 2],
+        &[9, 8, 7, 6, 5, 4, 3],
+        &[9, 8, 7, 6, 5, 4],
+        &[9, 8, 7, 6, 5],
+        &[9, 8, 7, 6],
+        &[9, 8, 7],
+        &[9, 8],
+        &[9],
+        &[],
+        &[9, 8, 7, 6, 5, 4, 3, 2, 11],
+        &[9, 8, 7, 6, 5, 4, 12],
+        &[9, 8, 7, 6, 13],
+        &[9, 8, 14],
+        &[9, 8, 7, 6, 5, 4, 3, 2, 11, 15],
+        &[9, 8, 7, 6, 5, 4, 12, 16],
+        &[9, 8, 7, 6, 13, 17],
+        &[9, 8, 14, 18],
+    ],
+    &[
+        &[2, 1, 0],
+        &[2, 1],
+        &[2],
+        &[2, 3],
+        &[2, 3, 4],
+        &[2, 3, 4, 5],
+        &[2, 3, 4, 5, 6],
+        &[2, 3, 4, 5, 6, 7],
+        &[2, 3, 4, 5, 6, 7, 8],
+        &[2, 3, 4, 5, 6, 7, 8, 9],
+        &[2, 3, 4, 5, 6, 7, 8, 9, 10],
+        &[],
+        &[2, 3, 4, 12],
+        &[2, 3, 4, 5, 6, 13],
+        &[2, 3, 4, 5, 6, 7, 8, 14],
+        &[15],
+        &[2, 3, 4, 12, 16],
+        &[2, 3, 4, 5, 6, 13, 17],
+        &[2, 3, 4, 5, 6, 7, 8, 14, 18],
+    ],
+    &[
+        &[4, 3, 2, 1, 0],
+        &[4, 3, 2, 1],
+        &[4, 3, 2],
+        &[4, 3],
+        &[4],
+        &[4, 5],
+        &[4, 5, 6],
+        &[4, 5, 6, 7],
+        &[4, 5, 6, 7, 8],
+        &[4, 5, 6, 7, 8, 9],
+        &[4, 5, 6, 7, 8, 9, 10],
+        &[4, 3, 2, 11],
+        &[],
+        &[4, 5, 6, 13],
+        &[4, 5, 6, 7, 8, 14],
+        &[4, 3, 2, 11, 15],
+        &[16],
+        &[4, 5, 6, 13, 17],
+        &[4, 5, 6, 7, 8, 14, 18],
+    ],
+    &[
+        &[6, 5, 4, 3, 2, 1, 0],
+        &[6, 5, 4, 3, 2, 1],
+        &[6, 5, 4, 3, 2],
+        &[6, 5, 4, 3],
+        &[6, 5, 4],
+        &[6, 5],
+        &[6],
+        &[6, 7],
+        &[6, 7, 8],
+        &[6, 7, 8, 9],
+        &[6, 7, 8, 9, 10],
+        &[6, 5, 4, 3, 2, 11],
+        &[6, 5, 4, 12],
+        &[],
+        &[6, 7, 8, 14],
+        &[6, 5, 4, 3, 2, 11, 15],
+        &[6, 5, 4, 12, 16],
+        &[17],
+        &[6, 7, 8, 14, 18],
+    ],
+    &[
+        &[8, 7, 6, 5, 4, 3, 2, 1, 0],
+        &[8, 7, 6, 5, 4, 3, 2, 1],
+        &[8, 7, 6, 5, 4, 3, 2],
+        &[8, 7, 6, 5, 4, 3],
+        &[8, 7, 6, 5, 4],
+        &[8, 7, 6, 5],
+        &[8, 7, 6],
+        &[8, 7],
+        &[8],
+        &[8, 9],
+        &[8, 9, 10],
+        &[8, 7, 6, 5, 4, 3, 2, 11],
+        &[8, 7, 6, 5, 4, 12],
+        &[8, 7, 6, 13],
+        &[],
+        &[8, 7, 6, 5, 4, 3, 2, 11, 15],
+        &[8, 7, 6, 5, 4, 12, 16],
+        &[8, 7, 6, 13, 17],
+        &[18],
+    ],
+    &[
+        &[11, 2, 1, 0],
+        &[11, 2, 1],
+        &[11, 2],
+        &[11, 2, 3],
+        &[11, 2, 3, 4],
+        &[11, 2, 3, 4, 5],
+        &[11, 2, 3, 4, 5, 6],
+        &[11, 2, 3, 4, 5, 6, 7],
+        &[11, 2, 3, 4, 5, 6, 7, 8],
+        &[11, 2, 3, 4, 5, 6, 7, 8, 9],
+        &[11, 2, 3, 4, 5, 6, 7, 8, 9, 10],
+        &[11],
+        &[11, 2, 3, 4, 12],
+        &[11, 2, 3, 4, 5, 6, 13],
+        &[11, 2, 3, 4, 5, 6, 7, 8, 14],
+        &[],
+        &[11, 2, 3, 4, 12, 16],
+        &[11, 2, 3, 4, 5, 6, 13, 17],
+        &[11, 2, 3, 4, 5, 6, 7, 8, 14, 18],
+    ],
+    &[
+        &[12, 4, 3, 2, 1, 0],
+        &[12, 4, 3, 2, 1],
+        &[12, 4, 3, 2],
+        &[12, 4, 3],
+        &[12, 4],
+        &[12, 4, 5],
+        &[12, 4, 5, 6],
+        &[12, 4, 5, 6, 7],
+        &[12, 4, 5, 6, 7, 8],
+        &[12, 4, 5, 6, 7, 8, 9],
+        &[12, 4, 5, 6, 7, 8, 9, 10],
+        &[12, 4, 3, 2, 11],
+        &[12],
+        &[12, 4, 5, 6, 13],
+        &[12, 4, 5, 6, 7, 8, 14],
+        &[12, 4, 3, 2, 11, 15],
+        &[],
+        &[12, 4, 5, 6, 13, 17],
+        &[12, 4, 5, 6, 7, 8, 14, 18],
+    ],
+    &[
+        &[13, 6, 5, 4, 3, 2, 1, 0],
+        &[13, 6, 5, 4, 3, 2, 1],
+        &[13, 6, 5, 4, 3, 2],
+        &[13, 6, 5, 4, 3],
+        &[13, 6, 5, 4],
+        &[13, 6, 5],
+        &[13, 6],
+        &[13, 6, 7],
+        &[13, 6, 7, 8],
+        &[13, 6, 7, 8, 9],
+        &[13, 6, 7, 8, 9, 10],
+        &[13, 6, 5, 4, 3, 2, 11],
+        &[13, 6, 5, 4, 12],
+        &[13],
+        &[13, 6, 7, 8, 14],
+        &[13, 6, 5, 4, 3, 2, 11, 15],
+        &[13, 6, 5, 4, 12, 16],
+        &[],
+        &[13, 6, 7, 8, 14, 18],
+    ],
+    &[
+        &[14, 8, 7, 6, 5, 4, 3, 2, 1, 0],
+        &[14, 8, 7, 6, 5, 4, 3, 2, 1],
+        &[14, 8, 7, 6, 5, 4, 3, 2],
+        &[14, 8, 7, 6, 5, 4, 3],
+        &[14, 8, 7, 6, 5, 4],
+        &[14, 8, 7, 6, 5],
+        &[14, 8, 7, 6],
+        &[14, 8, 7],
+        &[14, 8],
+        &[14, 8, 9],
+        &[14, 8, 9, 10],
+        &[14, 8, 7, 6, 5, 4, 3, 2, 11],
+        &[14, 8, 7, 6, 5, 4, 12],
+        &[14, 8, 7, 6, 13],
+        &[14],
+        &[14, 8, 7, 6, 5, 4, 3, 2, 11, 15],
+        &[14, 8, 7, 6, 5, 4, 12, 16],
+        &[14, 8, 7, 6, 13, 17],
+        &[],
+    ],
+];
+
+static CONNECTIVITY2: &[&[&[usize]]] = &[
+    &[
+        &[],
+        &[1],
+        &[1, 2],
+        &[1, 2, 3],
+        &[1, 2, 3, 4],
+        &[1, 2, 3, 4, 5],
+        &[1, 2, 3, 4, 5, 6],
+        &[1, 2, 3, 4, 5, 6, 7],
+        &[1, 2, 3, 4, 5, 6, 7, 8],
+        &[1, 2, 3, 4, 5, 6, 7, 8, 9],
+        &[1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
+        &[1, 2, 11],
+        &[1, 2, 3, 4, 12],
+        &[1, 2, 3, 4, 5, 6, 13],
+        &[1, 2, 3, 4, 5, 6, 7, 8, 14],
+        &[1, 2, 11, 15],
+        &[1, 2, 3, 4, 12, 16],
+        &[1, 2, 3, 4, 5, 6, 13, 17],
+        &[1, 2, 3, 4, 5, 6, 7, 8, 14, 18],
+        &[1, 2, 11, 15, 19],
+        &[1, 2, 3, 4, 12, 16, 20],
+        &[1, 2, 3, 4, 5, 6, 13, 17, 21],
+        &[1, 2, 3, 4, 5, 6, 7, 8, 14, 18, 22],
+        &[1, 2, 11, 15, 19, 23],
+        &[1, 2, 3, 4, 12, 16, 20, 24],
+        &[1, 2, 3, 4, 5, 6, 13, 17, 21, 25],
+        &[1, 2, 3, 4, 5, 6, 7, 8, 14, 18, 22, 26],
+    ],
+    &[
+        &[0],
+        &[],
+        &[2],
+        &[2, 3],
+        &[2, 3, 4],
+        &[2, 3, 4, 5],
+        &[2, 3, 4, 5, 6],
+        &[2, 3, 4, 5, 6, 7],
+        &[2, 3, 4, 5, 6, 7, 8],
+        &[2, 3, 4, 5, 6, 7, 8, 9],
+        &[2, 3, 4, 5, 6, 7, 8, 9, 10],
+        &[2, 11],
+        &[2, 3, 4, 12],
+        &[2, 3, 4, 5, 6, 13],
+        &[2, 3, 4, 5, 6, 7, 8, 14],
+        &[2, 11, 15],
+        &[2, 3, 4, 12, 16],
+        &[2, 3, 4, 5, 6, 13, 17],
+        &[2, 3, 4, 5, 6, 7, 8, 14, 18],
+        &[2, 11, 15, 19],
+        &[2, 3, 4, 12, 16, 20],
+        &[2, 3, 4, 5, 6, 13, 17, 21],
+        &[2, 3, 4, 5, 6, 7, 8, 14, 18, 22],
+        &[2, 11, 15, 19, 23],
+        &[2, 3, 4, 12, 16, 20, 24],
+        &[2, 3, 4, 5, 6, 13, 17, 21, 25],
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+        &[16, 12, 4, 3, 2, 1, 0],
+        &[16, 12, 4, 3, 2, 1],
+        &[16, 12, 4, 3, 2],
+        &[16, 12, 4, 3],
+        &[16, 12, 4],
+        &[16, 12, 4, 5],
+        &[16, 12, 4, 5, 6],
+        &[16, 12, 4, 5, 6, 7],
+        &[16, 12, 4, 5, 6, 7, 8],
+        &[16, 12, 4, 5, 6, 7, 8, 9],
+        &[16, 12, 4, 5, 6, 7, 8, 9, 10],
+        &[16, 12, 4, 3, 2, 11],
+        &[16, 12],
+        &[16, 12, 4, 5, 6, 13],
+        &[16, 12, 4, 5, 6, 7, 8, 14],
+        &[16, 12, 4, 3, 2, 11, 15],
+        &[16],
+        &[16, 12, 4, 5, 6, 13, 17],
+        &[16, 12, 4, 5, 6, 7, 8, 14, 18],
+        &[16, 12, 4, 3, 2, 11, 15, 19],
+        &[],
+        &[16, 12, 4, 5, 6, 13, 17, 21],
+        &[16, 12, 4, 5, 6, 7, 8, 14, 18, 22],
+        &[16, 12, 4, 3, 2, 11, 15, 19, 23],
+        &[24],
+        &[16, 12, 4, 5, 6, 13, 17, 21, 25],
+        &[16, 12, 4, 5, 6, 7, 8, 14, 18, 22, 26],
+    ],
+    &[
+        &[17, 13, 6, 5, 4, 3, 2, 1, 0],
+        &[17, 13, 6, 5, 4, 3, 2, 1],
+        &[17, 13, 6, 5, 4, 3, 2],
+        &[17, 13, 6, 5, 4, 3],
+        &[17, 13, 6, 5, 4],
+        &[17, 13, 6, 5],
+        &[17, 13, 6],
+        &[17, 13, 6, 7],
+        &[17, 13, 6, 7, 8],
+        &[17, 13, 6, 7, 8, 9],
+        &[17, 13, 6, 7, 8, 9, 10],
+        &[17, 13, 6, 5, 4, 3, 2, 11],
+        &[17, 13, 6, 5, 4, 12],
+        &[17, 13],
+        &[17, 13, 6, 7, 8, 14],
+        &[17, 13, 6, 5, 4, 3, 2, 11, 15],
+        &[17, 13, 6, 5, 4, 12, 16],
+        &[17],
+        &[17, 13, 6, 7, 8, 14, 18],
+        &[17, 13, 6, 5, 4, 3, 2, 11, 15, 19],
+        &[17, 13, 6, 5, 4, 12, 16, 20],
+        &[],
+        &[17, 13, 6, 7, 8, 14, 18, 22],
+        &[17, 13, 6, 5, 4, 3, 2, 11, 15, 19, 23],
+        &[17, 13, 6, 5, 4, 12, 16, 20, 24],
+        &[25],
+        &[17, 13, 6, 7, 8, 14, 18, 22, 26],
+    ],
+    &[
+        &[18, 14, 8, 7, 6, 5, 4, 3, 2, 1, 0],
+        &[18, 14, 8, 7, 6, 5, 4, 3, 2, 1],
+        &[18, 14, 8, 7, 6, 5, 4, 3, 2],
+        &[18, 14, 8, 7, 6, 5, 4, 3],
+        &[18, 14, 8, 7, 6, 5, 4],
+        &[18, 14, 8, 7, 6, 5],
+        &[18, 14, 8, 7, 6],
+        &[18, 14, 8, 7],
+        &[18, 14, 8],
+        &[18, 14, 8, 9],
+        &[18, 14, 8, 9, 10],
+        &[18, 14, 8, 7, 6, 5, 4, 3, 2, 11],
+        &[18, 14, 8, 7, 6, 5, 4, 12],
+        &[18, 14, 8, 7, 6, 13],
+        &[18, 14],
+        &[18, 14, 8, 7, 6, 5, 4, 3, 2, 11, 15],
+        &[18, 14, 8, 7, 6, 5, 4, 12, 16],
+        &[18, 14, 8, 7, 6, 13, 17],
+        &[18],
+        &[18, 14, 8, 7, 6, 5, 4, 3, 2, 11, 15, 19],
+        &[18, 14, 8, 7, 6, 5, 4, 12, 16, 20],
+        &[18, 14, 8, 7, 6, 13, 17, 21],
+        &[],
+        &[18, 14, 8, 7, 6, 5, 4, 3, 2, 11, 15, 19, 23],
+        &[18, 14, 8, 7, 6, 5, 4, 12, 16, 20, 24],
+        &[18, 14, 8, 7, 6, 13, 17, 21, 25],
+        &[26],
+    ],
+    &[
+        &[19, 15, 11, 2, 1, 0],
+        &[19, 15, 11, 2, 1],
+        &[19, 15, 11, 2],
+        &[19, 15, 11, 2, 3],
+        &[19, 15, 11, 2, 3, 4],
+        &[19, 15, 11, 2, 3, 4, 5],
+        &[19, 15, 11, 2, 3, 4, 5, 6],
+        &[19, 15, 11, 2, 3, 4, 5, 6, 7],
+        &[19, 15, 11, 2, 3, 4, 5, 6, 7, 8],
+        &[19, 15, 11, 2, 3, 4, 5, 6, 7, 8, 9],
+        &[19, 15, 11, 2, 3, 4, 5, 6, 7, 8, 9, 10],
+        &[19, 15, 11],
+        &[19, 15, 11, 2, 3, 4, 12],
+        &[19, 15, 11, 2, 3, 4, 5, 6, 13],
+        &[19, 15, 11, 2, 3, 4, 5, 6, 7, 8, 14],
+        &[19, 15],
+        &[19, 15, 11, 2, 3, 4, 12, 16],
+        &[19, 15, 11, 2, 3, 4, 5, 6, 13, 17],
+        &[19, 15, 11, 2, 3, 4, 5, 6, 7, 8, 14, 18],
+        &[19],
+        &[19, 15, 11, 2, 3, 4, 12, 16, 20],
+        &[19, 15, 11, 2, 3, 4, 5, 6, 13, 17, 21],
+        &[19, 15, 11, 2, 3, 4, 5, 6, 7, 8, 14, 18, 22],
+        &[],
+        &[19, 15, 11, 2, 3, 4, 12, 16, 20, 24],
+        &[19, 15, 11, 2, 3, 4, 5, 6, 13, 17, 21, 25],
+        &[19, 15, 11, 2, 3, 4, 5, 6, 7, 8, 14, 18, 22, 26],
+    ],
+    &[
+        &[20, 16, 12, 4, 3, 2, 1, 0],
+        &[20, 16, 12, 4, 3, 2, 1],
+        &[20, 16, 12, 4, 3, 2],
+        &[20, 16, 12, 4, 3],
+        &[20, 16, 12, 4],
+        &[20, 16, 12, 4, 5],
+        &[20, 16, 12, 4, 5, 6],
+        &[20, 16, 12, 4, 5, 6, 7],
+        &[20, 16, 12, 4, 5, 6, 7, 8],
+        &[20, 16, 12, 4, 5, 6, 7, 8, 9],
+        &[20, 16, 12, 4, 5, 6, 7, 8, 9, 10],
+        &[20, 16, 12, 4, 3, 2, 11],
+        &[20, 16, 12],
+        &[20, 16, 12, 4, 5, 6, 13],
+        &[20, 16, 12, 4, 5, 6, 7, 8, 14],
+        &[20, 16, 12, 4, 3, 2, 11, 15],
+        &[20, 16],
+        &[20, 16, 12, 4, 5, 6, 13, 17],
+        &[20, 16, 12, 4, 5, 6, 7, 8, 14, 18],
+        &[20, 16, 12, 4, 3, 2, 11, 15, 19],
+        &[20],
+        &[20, 16, 12, 4, 5, 6, 13, 17, 21],
+        &[20, 16, 12, 4, 5, 6, 7, 8, 14, 18, 22],
+        &[20, 16, 12, 4, 3, 2, 11, 15, 19, 23],
+        &[],
+        &[20, 16, 12, 4, 5, 6, 13, 17, 21, 25],
+        &[20, 16, 12, 4, 5, 6, 7, 8, 14, 18, 22, 26],
+    ],
+    &[
+        &[21, 17, 13, 6, 5, 4, 3, 2, 1, 0],
+        &[21, 17, 13, 6, 5, 4, 3, 2, 1],
+        &[21, 17, 13, 6, 5, 4, 3, 2],
+        &[21, 17, 13, 6, 5, 4, 3],
+        &[21, 17, 13, 6, 5, 4],
+        &[21, 17, 13, 6, 5],
+        &[21, 17, 13, 6],
+        &[21, 17, 13, 6, 7],
+        &[21, 17, 13, 6, 7, 8],
+        &[21, 17, 13, 6, 7, 8, 9],
+        &[21, 17, 13, 6, 7, 8, 9, 10],
+        &[21, 17, 13, 6, 5, 4, 3, 2, 11],
+        &[21, 17, 13, 6, 5, 4, 12],
+        &[21, 17, 13],
+        &[21, 17, 13, 6, 7, 8, 14],
+        &[21, 17, 13, 6, 5, 4, 3, 2, 11, 15],
+        &[21, 17, 13, 6, 5, 4, 12, 16],
+        &[21, 17],
+        &[21, 17, 13, 6, 7, 8, 14, 18],
+        &[21, 17, 13, 6, 5, 4, 3, 2, 11, 15, 19],
+        &[21, 17, 13, 6, 5, 4, 12, 16, 20],
+        &[21],
+        &[21, 17, 13, 6, 7, 8, 14, 18, 22],
+        &[21, 17, 13, 6, 5, 4, 3, 2, 11, 15, 19, 23],
+        &[21, 17, 13, 6, 5, 4, 12, 16, 20, 24],
+        &[],
+        &[21, 17, 13, 6, 7, 8, 14, 18, 22, 26],
+    ],
+    &[
+        &[22, 18, 14, 8, 7, 6, 5, 4, 3, 2, 1, 0],
+        &[22, 18, 14, 8, 7, 6, 5, 4, 3, 2, 1],
+        &[22, 18, 14, 8, 7, 6, 5, 4, 3, 2],
+        &[22, 18, 14, 8, 7, 6, 5, 4, 3],
+        &[22, 18, 14, 8, 7, 6, 5, 4],
+        &[22, 18, 14, 8, 7, 6, 5],
+        &[22, 18, 14, 8, 7, 6],
+        &[22, 18, 14, 8, 7],
+        &[22, 18, 14, 8],
+        &[22, 18, 14, 8, 9],
+        &[22, 18, 14, 8, 9, 10],
+        &[22, 18, 14, 8, 7, 6, 5, 4, 3, 2, 11],
+        &[22, 18, 14, 8, 7, 6, 5, 4, 12],
+        &[22, 18, 14, 8, 7, 6, 13],
+        &[22, 18, 14],
+        &[22, 18, 14, 8, 7, 6, 5, 4, 3, 2, 11, 15],
+        &[22, 18, 14, 8, 7, 6, 5, 4, 12, 16],
+        &[22, 18, 14, 8, 7, 6, 13, 17],
+        &[22, 18],
+        &[22, 18, 14, 8, 7, 6, 5, 4, 3, 2, 11, 15, 19],
+        &[22, 18, 14, 8, 7, 6, 5, 4, 12, 16, 20],
+        &[22, 18, 14, 8, 7, 6, 13, 17, 21],
+        &[22],
+        &[22, 18, 14, 8, 7, 6, 5, 4, 3, 2, 11, 15, 19, 23],
+        &[22, 18, 14, 8, 7, 6, 5, 4, 12, 16, 20, 24],
+        &[22, 18, 14, 8, 7, 6, 13, 17, 21, 25],
+        &[],
+    ],
+];
+
+#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
+enum Amphipod {
+    A,
+    B,
+    C,
+    D,
+}
+use Amphipod::*;
+
+impl Amphipod {
+    fn step_cost(&self) -> i64 {
+        match self {
+            A => 1,
+            B => 10,
+            C => 100,
+            D => 1000,
+        }
+    }
+}
+
+impl std::str::FromStr for Amphipod {
+    type Err = anyhow::Error;
+    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
+        match s {
+            "A" => Ok(A),
+            "B" => Ok(B),
+            "C" => Ok(C),
+            "D" => Ok(D),
+            _ => Err(anyhow::anyhow!(s.to_string())),
+        }
+    }
+}
+
+impl std::fmt::Display for Amphipod {
+    fn fmt(
+        &self,
+        f: &mut std::fmt::Formatter<'_>,
+    ) -> std::result::Result<(), std::fmt::Error> {
+        match self {
+            A => write!(f, "A"),
+            B => write!(f, "B"),
+            C => write!(f, "C"),
+            D => write!(f, "D"),
+        }
+    }
+}
+
+// #############
+// #abcdefghijk#
+// ###l#m#n#o###
+//   #p#q#r#s#
+//   #########
+#[derive(Debug, Clone, Copy, Default, Hash, PartialEq, Eq)]
+pub struct Burrow {
+    spaces: [Option<Amphipod>; 27],
+    big: bool,
+}
+
+impl Burrow {
+    fn to_big(self) -> Self {
+        let mut big = self;
+
+        big.spaces[23] = self.spaces[15];
+        big.spaces[24] = self.spaces[16];
+        big.spaces[25] = self.spaces[17];
+        big.spaces[26] = self.spaces[18];
+
+        big.spaces[15] = Some(D);
+        big.spaces[16] = Some(C);
+        big.spaces[17] = Some(B);
+        big.spaces[18] = Some(A);
+        big.spaces[19] = Some(D);
+        big.spaces[20] = Some(B);
+        big.spaces[21] = Some(A);
+        big.spaces[22] = Some(C);
+
+        big.big = true;
+
+        big
+    }
+
+    fn path(&self, from: usize, to: usize) -> &[usize] {
+        if self.big {
+            CONNECTIVITY2[from][to]
+        } else {
+            CONNECTIVITY1[from][to]
+        }
+    }
+
+    fn done(&self) -> bool {
+        self.spaces[11] == Some(A)
+            && self.spaces[15] == Some(A)
+            && self.spaces[12] == Some(B)
+            && self.spaces[16] == Some(B)
+            && self.spaces[13] == Some(C)
+            && self.spaces[17] == Some(C)
+            && self.spaces[14] == Some(D)
+            && self.spaces[18] == Some(D)
+            && (!self.big
+                || (self.spaces[19] == Some(A)
+                    && self.spaces[23] == Some(A)
+                    && self.spaces[20] == Some(B)
+                    && self.spaces[24] == Some(B)
+                    && self.spaces[21] == Some(C)
+                    && self.spaces[25] == Some(C)
+                    && self.spaces[22] == Some(D)
+                    && self.spaces[26] == Some(D)))
+    }
+
+    fn move_cost(&self, mv: Move) -> i64 {
+        self.spaces[mv.from].unwrap().step_cost()
+            * i64::try_from(self.path(mv.from, mv.to).len()).unwrap()
+    }
+
+    fn make_move(&self, mv: Move) -> Self {
+        let mut new = *self;
+        let a = new.spaces[mv.from].take().unwrap();
+        assert!(new.spaces[mv.to].is_none());
+        new.spaces[mv.to] = Some(a);
+        new
+    }
+
+    fn legal_moves(&self) -> Vec<Move> {
+        let mut ret = vec![];
+        let size = if self.big { 27 } else { 19 };
+        for (from, space) in self.spaces.iter().enumerate().take(size) {
+            if let Some(a) = space {
+                for to in 0..size {
+                    if self.can_move(*a, from, to) {
+                        ret.push(Move::new(from, to));
+                    }
+                }
+            }
+        }
+        ret
+    }
+
+    fn can_move(&self, a: Amphipod, from: usize, to: usize) -> bool {
+        if !self.big && (from >= 19 || to >= 19) {
+            return false;
+        }
+
+        // Amphipods will never stop on the space immediately outside any
+        // room.
+        if to == 2 || to == 4 || to == 6 || to == 8 {
+            return false;
+        }
+
+        // Amphipods will never move from the hallway into a room unless that
+        // room is their destination room and that room contains no amphipods
+        // which do not also have that room as their own destination.
+        match a {
+            A => {
+                if to == 12
+                    || to == 13
+                    || to == 14
+                    || to == 16
+                    || to == 17
+                    || to == 18
+                    || to == 20
+                    || to == 21
+                    || to == 22
+                    || to == 24
+                    || to == 25
+                    || to == 26
+                {
+                    return false;
+                }
+                if self.big {
+                    if to == 11
+                        && (self.spaces[15] != Some(A)
+                            || self.spaces[19] != Some(A)
+                            || self.spaces[23] != Some(A))
+                    {
+                        return false;
+                    }
+                    if to == 15
+                        && (self.spaces[19] != Some(A)
+                            || self.spaces[23] != Some(A))
+                    {
+                        return false;
+                    }
+                    if to == 19 && self.spaces[23] != Some(A) {
+                        return false;
+                    }
+                    if from == 23
+                        || (from == 19 && self.spaces[23] == Some(A))
+                        || (from == 15
+                            && self.spaces[23] == Some(A)
+                            && self.spaces[19] == Some(A))
+                        || (from == 11
+                            && self.spaces[23] == Some(A)
+                            && self.spaces[19] == Some(A)
+                            && self.spaces[15] == Some(A))
+                    {
+                        return false;
+                    }
+                } else {
+                    if to == 11 && self.spaces[15] != Some(A) {
+                        return false;
+                    }
+                    if from == 15
+                        || (from == 11 && self.spaces[15] == Some(A))
+                    {
+                        return false;
+                    }
+                }
+            }
+            B => {
+                if to == 11
+                    || to == 13
+                    || to == 14
+                    || to == 15
+                    || to == 17
+                    || to == 18
+                    || to == 19
+                    || to == 21
+                    || to == 22
+                    || to == 23
+                    || to == 25
+                    || to == 26
+                {
+                    return false;
+                }
+                if self.big {
+                    if to == 12
+                        && (self.spaces[16] != Some(B)
+                            || self.spaces[20] != Some(B)
+                            || self.spaces[24] != Some(B))
+                    {
+                        return false;
+                    }
+                    if to == 16
+                        && (self.spaces[20] != Some(B)
+                            || self.spaces[24] != Some(B))
+                    {
+                        return false;
+                    }
+                    if to == 20 && self.spaces[24] != Some(B) {
+                        return false;
+                    }
+                    if from == 24
+                        || (from == 20 && self.spaces[24] == Some(B))
+                        || (from == 16
+                            && self.spaces[24] == Some(B)
+                            && self.spaces[20] == Some(B))
+                        || (from == 12
+                            && self.spaces[24] == Some(B)
+                            && self.spaces[20] == Some(B)
+                            && self.spaces[16] == Some(B))
+                    {
+                        return false;
+                    }
+                } else {
+                    if to == 12 && self.spaces[16] != Some(B) {
+                        return false;
+                    }
+                    if from == 16
+                        || (from == 12 && self.spaces[16] == Some(B))
+                    {
+                        return false;
+                    }
+                }
+            }
+            C => {
+                if to == 11
+                    || to == 12
+                    || to == 14
+                    || to == 15
+                    || to == 16
+                    || to == 18
+                    || to == 19
+                    || to == 20
+                    || to == 22
+                    || to == 23
+                    || to == 24
+                    || to == 26
+                {
+                    return false;
+                }
+                if self.big {
+                    if to == 13
+                        && (self.spaces[17] != Some(C)
+                            || self.spaces[21] != Some(C)
+                            || self.spaces[25] != Some(C))
+                    {
+                        return false;
+                    }
+                    if to == 17
+                        && (self.spaces[21] != Some(C)
+                            || self.spaces[25] != Some(C))
+                    {
+                        return false;
+                    }
+                    if to == 21 && self.spaces[25] != Some(C) {
+                        return false;
+                    }
+                    if from == 25
+                        || (from == 21 && self.spaces[25] == Some(C))
+                        || (from == 17
+                            && self.spaces[25] == Some(C)
+                            && self.spaces[21] == Some(C))
+                        || (from == 13
+                            && self.spaces[25] == Some(C)
+                            && self.spaces[21] == Some(C)
+                            && self.spaces[17] == Some(C))
+                    {
+                        return false;
+                    }
+                } else {
+                    if to == 13 && self.spaces[17] != Some(C) {
+                        return false;
+                    }
+                    if from == 17
+                        || (from == 13 && self.spaces[17] == Some(C))
+                    {
+                        return false;
+                    }
+                }
+            }
+            D => {
+                if to == 11
+                    || to == 12
+                    || to == 13
+                    || to == 15
+                    || to == 16
+                    || to == 17
+                    || to == 19
+                    || to == 20
+                    || to == 21
+                    || to == 23
+                    || to == 24
+                    || to == 25
+                {
+                    return false;
+                }
+                if self.big {
+                    if to == 14
+                        && (self.spaces[18] != Some(D)
+                            || self.spaces[22] != Some(D)
+                            || self.spaces[26] != Some(D))
+                    {
+                        return false;
+                    }
+                    if to == 18
+                        && (self.spaces[22] != Some(D)
+                            || self.spaces[26] != Some(D))
+                    {
+                        return false;
+                    }
+                    if to == 22 && self.spaces[26] != Some(D) {
+                        return false;
+                    }
+                    if from == 26
+                        || (from == 22 && self.spaces[26] == Some(D))
+                        || (from == 18
+                            && self.spaces[26] == Some(D)
+                            && self.spaces[22] == Some(D))
+                        || (from == 14
+                            && self.spaces[26] == Some(D)
+                            && self.spaces[22] == Some(D)
+                            && self.spaces[18] == Some(D))
+                    {
+                        return false;
+                    }
+                } else {
+                    if to == 14 && self.spaces[18] != Some(D) {
+                        return false;
+                    }
+                    if from == 18
+                        || (from == 14 && self.spaces[18] == Some(D))
+                    {
+                        return false;
+                    }
+                }
+            }
+        }
+
+        // Once an amphipod stops moving in the hallway, it will stay in that
+        // spot until it can move into a room.
+        if from < 11 && to < 11 {
+            return false;
+        }
+
+        // not actually a move
+        if from == to {
+            return false;
+        }
+
+        // we don't have an unblocked path
+        for space in self.path(from, to) {
+            if self.spaces[*space].is_some() {
+                return false;
+            }
+        }
+
+        true
+    }
+}
+
+impl std::fmt::Display for Burrow {
+    fn fmt(
+        &self,
+        f: &mut std::fmt::Formatter<'_>,
+    ) -> std::result::Result<(), std::fmt::Error> {
+        writeln!(f, "#############")?;
+
+        write!(f, "#")?;
+        for i in 0..11 {
+            if let Some(a) = &self.spaces[i] {
+                write!(f, "{}", a)?;
+            } else {
+                write!(f, ".")?;
+            }
+        }
+        writeln!(f, "#")?;
+
+        write!(f, "###")?;
+        for i in 11..15 {
+            if let Some(a) = &self.spaces[i] {
+                write!(f, "{}#", a)?;
+            } else {
+                write!(f, ".#")?;
+            }
+        }
+        writeln!(f, "##")?;
+
+        write!(f, "  #")?;
+        for i in 15..19 {
+            if let Some(a) = &self.spaces[i] {
+                write!(f, "{}#", a)?;
+            } else {
+                write!(f, ".#")?;
+            }
+        }
+        writeln!(f)?;
+
+        if self.big {
+            write!(f, "  #")?;
+            for i in 19..23 {
+                if let Some(a) = &self.spaces[i] {
+                    write!(f, "{}#", a)?;
+                } else {
+                    write!(f, ".#")?;
+                }
+            }
+            writeln!(f)?;
+            write!(f, "  #")?;
+            for i in 23..27 {
+                if let Some(a) = &self.spaces[i] {
+                    write!(f, "{}#", a)?;
+                } else {
+                    write!(f, ".#")?;
+                }
+            }
+            writeln!(f)?;
+        }
+
+        write!(f, "  #########")?;
+
+        Ok(())
+    }
+}
+
+#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
+struct Move {
+    from: usize,
+    to: usize,
+}
+
+impl Move {
+    fn new(from: usize, to: usize) -> Self {
+        Self { from, to }
+    }
+}
+
+pub fn parse(fh: File) -> Result<Burrow> {
+    let mut burrow = Burrow::default();
+    let lines: Vec<_> = parse::lines(fh).collect();
+
+    let captures =
+        regex_captures!(r"###(.)#(.)#(.)#(.)###", &lines[2]).unwrap();
+    burrow.spaces[11] = Some(captures[1].parse()?);
+    burrow.spaces[12] = Some(captures[2].parse()?);
+    burrow.spaces[13] = Some(captures[3].parse()?);
+    burrow.spaces[14] = Some(captures[4].parse()?);
+
+    let captures =
+        regex_captures!(r"  #(.)#(.)#(.)#(.)#", &lines[3]).unwrap();
+    burrow.spaces[15] = Some(captures[1].parse()?);
+    burrow.spaces[16] = Some(captures[2].parse()?);
+    burrow.spaces[17] = Some(captures[3].parse()?);
+    burrow.spaces[18] = Some(captures[4].parse()?);
+
+    Ok(burrow)
+}
+
+#[allow(dead_code)]
+fn organize_recursive(burrow: Burrow, so_far: &mut Vec<Move>) -> bool {
+    if burrow.done() {
+        return true;
+    }
+    for mv in burrow.legal_moves() {
+        so_far.push(mv);
+        if organize_recursive(burrow.make_move(mv), so_far) {
+            return true;
+        }
+        so_far.pop();
+    }
+    false
+}
+
+fn organize_dijkstra(burrow: Burrow) -> (i64, Vec<Burrow>) {
+    let mut to_visit = priority_queue::PriorityQueue::new();
+    let mut prev = HashMap::new();
+    to_visit.push(burrow, std::cmp::Reverse(0));
+    while let Some((burrow, std::cmp::Reverse(distance))) = to_visit.pop() {
+        if burrow.done() {
+            let mut path = vec![burrow];
+            let mut cur = burrow;
+            while let Some(next) = prev.get(&cur) {
+                path.insert(0, *next);
+                cur = *next;
+            }
+            return (distance, path);
+        }
+        for mv in burrow.legal_moves() {
+            let next = burrow.make_move(mv);
+            prev.insert(next, burrow);
+            let new_distance = distance + burrow.move_cost(mv);
+            if to_visit.get(&next).is_some() {
+                if new_distance < to_visit.get_priority(&next).unwrap().0 {
+                    to_visit.change_priority(
+                        &next,
+                        std::cmp::Reverse(new_distance),
+                    );
+                }
+            } else {
+                to_visit.push(next, std::cmp::Reverse(new_distance));
+            }
+        }
+    }
+    unreachable!()
+}
+
+pub fn part1(burrow: Burrow) -> Result<i64> {
+    let (cost, _path) = organize_dijkstra(burrow);
+    // for burrow in path {
+    //     eprintln!("{}", burrow);
+    // }
+    Ok(cost)
+}
+
+pub fn part2(burrow: Burrow) -> Result<i64> {
+    let (cost, _path) = organize_dijkstra(burrow.to_big());
+    // for burrow in path {
+    //     eprintln!("{}", burrow);
+    // }
+    Ok(cost)
+}
+
+#[test]
+fn test() {
+    assert_eq!(
+        part1(parse(parse::data(2021, 23).unwrap()).unwrap()).unwrap(),
+        0
+    );
+    assert_eq!(
+        part2(parse(parse::data(2021, 23).unwrap()).unwrap()).unwrap(),
+        0
+    );
+}
diff --git a/src/2021/mod.rs b/src/2021/mod.rs
index 124ea71..7d2bdad 100644
--- a/src/2021/mod.rs
+++ b/src/2021/mod.rs
@@ -44,6 +44,8 @@ mod day20;
 mod day21;
 #[path = "22/mod.rs"]
 mod day22;
+#[path = "23/mod.rs"]
+mod day23;
 // NEXT MOD
 
 pub fn run(day: u8, puzzle: u8) -> Result<i64> {
@@ -92,6 +94,8 @@ pub fn run(day: u8, puzzle: u8) -> Result<i64> {
         (21, 2) => day21::part2(day21::parse(parse::data(2021, 21)?)?),
         (22, 1) => day22::part1(day22::parse(parse::data(2021, 22)?)?),
         (22, 2) => day22::part2(day22::parse(parse::data(2021, 22)?)?),
+        (23, 1) => day23::part1(day23::parse(parse::data(2021, 23)?)?),
+        (23, 2) => day23::part2(day23::parse(parse::data(2021, 23)?)?),
         // NEXT PART
         _ => Err(anyhow!("unknown puzzle {}-{}", day, puzzle)),
     }