day20 part 2

input/day20_example2.txt

@@ -0,0 +1,37 @@
+             Z L X W       C
+             Z P Q B       K
+  ###########.#.#.#.#######.###############
+  #...#.......#.#.......#.#.......#.#.#...#
+  ###.#.#.#.#.#.#.#.###.#.#.#######.#.#.###
+  #.#...#.#.#...#.#.#...#...#...#.#.......#
+  #.###.#######.###.###.#.###.###.#.#######
+  #...#.......#.#...#...#.............#...#
+  #.#########.#######.#.#######.#######.###
+  #...#.#    F       R I       Z    #.#.#.#
+  #.###.#    D       E C       H    #.#.#.#
+  #.#...#                           #...#.#
+  #.###.#                           #.###.#
+  #.#....OA                       WB..#.#..ZH
+  #.###.#                           #.#.#.#
+CJ......#                           #.....#
+  #######                           #######
+  #.#....CK                         #......IC
+  #.###.#                           #.###.#
+  #.....#                           #...#.#
+  ###.###                           #.#.#.#
+XF....#.#                         RF..#.#.#
+  #####.#                           #######
+  #......CJ                       NM..#...#
+  ###.#.#                           #.###.#
+RE....#.#                           #......RF
+  ###.###        X   X       L      #.#.#.#
+  #.....#        F   Q       P      #.#.#.#
+  ###.###########.###.#######.#########.###
+  #.....#...#.....#.......#...#.....#.#...#
+  #####.#.###.#######.#######.###.###.#.#.#
+  #.......#.......#.#.#.#.#...#...#...#.#.#
+  #####.###.#####.#.#.#.#.###.###.#.###.###
+  #.......#.....#.#...#...............#...#
+  #############.#.#.###.###################
+               A O F   N
+               A A D   M

src/tasks/day20.rs

@@ -5,6 +5,10 @@ pub fn run() {
     let maze = Maze::from(&input, PortalField::curried_factory);
     let part1 = maze.shortest_path();
     println!("Part 1: {}", part1);
+
+    let maze = Maze::from(&input, DimensionField::curried_factory);
+    let part1 = maze.shortest_path();
+    println!("Part 2: {}", part1);
 }
 
 type C = i32;
@@ -94,17 +98,24 @@ struct DimensionField {
 }
 
 impl DimensionField {
-    fn is_inner(&self) -> bool {
-        !self.is_outer()
-    }
-    fn is_outer(&self) -> bool {
-        false
+    fn is_inward(&self) -> bool {
+        let p = self.point;
+        p.x > 2 && p.x < self.map_width - 3 && p.y > 2 && p.y < self.map_height - 3
     }
 }
 
 impl Field for DimensionField {
     fn neighbors(&self, at_level: usize) -> Vec<RealPoint> {
-        todo!()
+        let mut result: Vec<RealPoint> = self.neighbors.iter().map(|n| RealPoint::from(*n, at_level)).collect();
+        if let Some(destination) = self.jump {
+            if self.is_inward() {
+                result.push(RealPoint::from(destination, at_level + 1));
+            } else if at_level > 0 {
+                result.push(RealPoint::from(destination, at_level - 1));
+            }
+        }
+
+        result
     }
 
     fn set_label_partner(&mut self, point: MapPoint) {
@@ -266,8 +277,10 @@ fn bfs(map: &FieldMap, start: RealPoint, finish: RealPoint) -> usize {
     let mut seen: HashSet<RealPoint> = HashSet::new();
 
     open.push_back((start, 0));
+    seen.insert(start);
 
     while let Some((p, d)) = open.pop_front() {
+        println!("{:?}   {}", p, d);
         if p == finish {
             return d;
         }
@@ -275,24 +288,32 @@ fn bfs(map: &FieldMap, start: RealPoint, finish: RealPoint) -> usize {
         for neighbor in map[&p.map_point()].neighbors(p.level) {
             if !seen.contains(&neighbor) {
                 open.push_back((neighbor, d + 1));
+                seen.insert(neighbor);
             }
-            seen.insert(neighbor);
         }
     }
     panic!("no path found")
+    PortalField
 }
 
 #[cfg(test)]
 mod test {
-    use crate::tasks::day20::{Field, Maze, PortalField};
+    use crate::tasks::day20::{DimensionField, Field, Maze, PortalField};
 
     #[test]
-    fn example1() {
+    fn example_part1() {
         let input = std::fs::read_to_string("input/day20_example1.txt").unwrap();
         let maze = Maze::from(&input, PortalField::curried_factory);
         assert_eq!(maze.shortest_path(), 23);
     }
 
+    #[test]
+    fn example_part2() {
+        let input = std::fs::read_to_string("input/day20_example2.txt").unwrap();
+        let maze = Maze::from(&input, DimensionField::curried_factory);
+        assert_eq!(maze.shortest_path(), 396);
+    }
+
     #[test]
     fn result() {
         let input = std::fs::read_to_string("input/day20.txt").unwrap();