Work on day22

day22/src/main.rs

@@ -15,13 +15,15 @@ enum SolvePuzzle {
 }
 
 fn solve_first_puzzle<R: BufRead>(reader: R) -> usize {
-    let map = Map::parse(reader);
+    let map = Map::<false, 1>::parse(reader);
     map.display();
     map.crack_password()
 }
 
-fn solve_second_puzzle<R: BufRead>(reader: R) -> usize {
-    todo!()
+fn solve_second_puzzle<const CUBE_EDGE_WIDTH: usize, R: BufRead>(reader: R) -> usize {
+    let map = Map::<true, CUBE_EDGE_WIDTH>::parse(reader);
+    map.display();
+    map.crack_password()
 }
 
 fn main() {
@@ -38,7 +40,7 @@ fn main() {
     let file = BufReader::new(File::open(file).expect("Opening file"));
     match solve {
         SolvePuzzle::First => println!("{}", solve_first_puzzle(file)),
-        SolvePuzzle::Second => println!("{}", solve_second_puzzle(file)),
+        SolvePuzzle::Second => println!("{}", solve_second_puzzle::<50, _>(file)),
     };
 }
 
@@ -51,12 +53,12 @@ mod tests {
     #[test]
     fn example_on_first() {
         let reader = Cursor::new(include_str!("../input.test"));
-        assert_eq!(solve_first_puzzle(reader), 152);
+        assert_eq!(solve_first_puzzle(reader), 6032);
     }
 
     #[test]
     fn example_on_second() {
         let reader = Cursor::new(include_str!("../input.test"));
-        assert_eq!(solve_second_puzzle(reader), 301);
+        assert_eq!(solve_second_puzzle::<4, _>(reader), 5031);
     }
 }

day22/src/map.rs

@@ -7,6 +7,7 @@ pub enum Facing {
     South,
     West,
 }
+
 impl Facing {
     fn turn_left(&mut self) {
         *self = match self {
@@ -26,15 +27,6 @@ impl Facing {
         }
     }
 
-    fn opposite(&self) -> Self {
-        match self {
-            Facing::North => Facing::South,
-            Facing::East => Facing::West,
-            Facing::South => Facing::North,
-            Facing::West => Facing::East,
-        }
-    }
-
     fn to_number(&self) -> usize {
         match self {
             Facing::North => 3,
@@ -99,13 +91,13 @@ impl Action {
 }
 
 #[derive(Debug)]
-pub struct Map {
+pub struct Map<const IS_CUBE: bool, const CUBE_EDGE_WIDTH: usize> {
     tiles: Vec<Tile>,
     width: usize,
     actions: Vec<Action>,
 }
 
-impl Map {
+impl<const IS_CUBE: bool, const CUBE_EDGE_WIDTH: usize> Map<IS_CUBE, CUBE_EDGE_WIDTH> {
     pub fn parse<R: BufRead>(reader: R) -> Self {
         let mut lines: Vec<String> = reader.lines().map(Result::unwrap).collect();
         let instructions = lines.pop().expect("Instructions on the last line");
@@ -153,28 +145,37 @@ impl Map {
 
     pub fn crack_password(&self) -> usize {
         let (mut x, mut y) = self.first_position();
+        println!("-- ({:>2}, {:>2})", x + 1, y + 1);
         let mut facing = Facing::East;
-        'label: for action in &self.actions {
+        let width = self.width;
+        let height = self.tiles.len() / self.width;
+        for action in &self.actions {
+            println!("DIR   : {facing:?}");
+            println!("ACTION: {action:?}");
             match action {
                 Action::Move(amount) => {
                     for _step in 0..*amount {
                         let raw_potential_new_position = match facing {
-                            Facing::North => (x, y - 1),
+                            Facing::North => (x, if y == 0 { height - 1 } else { y - 1 }),
                             Facing::East => (x + 1, y),
                             Facing::South => (x, y + 1),
-                            Facing::West => (x - 1, y),
+                            Facing::West => (if x == 0 { width - 1 } else { x - 1 }, y),
                         };
                         let potential_new_position =
                             self.wrap_position(raw_potential_new_position, facing);
                         if self[potential_new_position] == Tile::Solid {
-                            break 'label;
+                            break;
                         }
+                        x = potential_new_position.0;
+                        y = potential_new_position.1;
+                        println!("-> ({:>2}, {:>2})", x + 1, y + 1);
                     }
                 }
                 Action::Left => facing.turn_left(),
                 Action::Right => facing.turn_right(),
             }
         }
+        println!("> {} {} {}", x + 1, y + 1, facing.to_number());
         1000 * (y + 1) + 4 * (x + 1) + facing.to_number()
     }
 
@@ -192,12 +193,22 @@ impl Map {
         let wrap_array = |x: usize, y: usize| (x % self.width, y % height);
         let (x, y) = wrap_array(x, y);
         if self[(x, y)] == Tile::Void {
+            let mut next = (x, y);
             loop {
-                let next = match facing {
-                    Facing::North => wrap_array(x, if y == 0 { height - 1 } else { y - 1 }),
-                    Facing::East => wrap_array(x + 1, y),
-                    Facing::South => wrap_array(x, y + 1),
-                    Facing::West => wrap_array(if x == 0 { self.width - 1 } else { x - 1 }, y),
+                next = match facing {
+                    Facing::North => {
+                        wrap_array(next.0, if next.1 == 0 { height - 1 } else { next.1 - 1 })
+                    }
+                    Facing::East => wrap_array(next.0 + 1, next.1),
+                    Facing::South => wrap_array(next.0, next.1 + 1),
+                    Facing::West => wrap_array(
+                        if next.0 == 0 {
+                            self.width - 1
+                        } else {
+                            next.0 - 1
+                        },
+                        next.1,
+                    ),
                 };
                 if self[next] != Tile::Void {
                     break next;
@@ -209,7 +220,9 @@ impl Map {
     }
 }
 
-impl Index<(usize, usize)> for Map {
+impl<const IS_CUBE: bool, const CUBE_EDGE_WIDTH: usize> Index<(usize, usize)>
+    for Map<IS_CUBE, CUBE_EDGE_WIDTH>
+{
     type Output = Tile;
 
     fn index(&self, (x, y): (usize, usize)) -> &Self::Output {