wip

data/23.in

@@ -0,0 +1,141 @@
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+###########################################################################################################################################.#

src/bin/day23.rs

@@ -0,0 +1,319 @@
+use hashbrown::HashMap;
+use std::ops::{Index, IndexMut};
+
+#[derive(PartialEq, Eq, PartialOrd, Ord, Copy, Clone, Hash, Debug)]
+struct Pos {
+    x: usize,
+    y: usize,
+}
+
+impl Pos {
+    fn north(&self) -> Self {
+        Pos {
+            x: self.x - 1,
+            y: self.y,
+        }
+    }
+
+    fn south(&self) -> Self {
+        Pos {
+            x: self.x + 1,
+            y: self.y,
+        }
+    }
+
+    fn west(&self) -> Self {
+        Pos {
+            x: self.x,
+            y: self.y - 1,
+        }
+    }
+
+    fn east(&self) -> Self {
+        Pos {
+            x: self.x,
+            y: self.y + 1,
+        }
+    }
+}
+
+struct Grid<T> {
+    buffer: Vec<T>,
+    height: usize,
+    width: usize,
+}
+
+impl<T: Clone> Grid<T> {
+    fn new(height: usize, width: usize, default: T) -> Self {
+        Self {
+            buffer: vec![default; height * width],
+            height,
+            width,
+        }
+    }
+
+    fn from_buffer(buffer: Vec<T>, width: usize) -> Self {
+        let height = buffer.len() / width;
+        Self {
+            buffer,
+            height,
+            width,
+        }
+    }
+
+    fn adj4<'a>(&'a self, pos: &Pos) -> impl Iterator<Item = Pos> + 'a {
+        [
+            (pos.x.wrapping_sub(1), pos.y),
+            (pos.x + 1, pos.y),
+            (pos.x, pos.y.wrapping_sub(1)),
+            (pos.x, pos.y + 1),
+        ]
+        .into_iter()
+        .filter(|(x, y)| (x < &self.height) & (y < &self.width))
+        .map(|(x, y)| Pos { x, y })
+    }
+}
+
+impl<T> Index<Pos> for Grid<T> {
+    type Output = T;
+
+    fn index(&self, index: Pos) -> &Self::Output {
+        &self.buffer[index.x * &self.width + index.y]
+    }
+}
+
+impl<T> IndexMut<Pos> for Grid<T> {
+    fn index_mut(&mut self, index: Pos) -> &mut Self::Output {
+        &mut self.buffer[index.x * &self.width + index.y]
+    }
+}
+
+fn search(grid: &Grid<u8>, seen: &mut Grid<bool>, pos: Pos, steps: usize) -> usize {
+    let destination = Pos {
+        x: grid.height - 1,
+        y: grid.width - 2,
+    };
+
+    if pos == destination {
+        return steps;
+    }
+
+    if seen[pos] {
+        return 0;
+    }
+
+    let steps = steps + 1;
+    seen[pos] = true;
+    let result = match grid[pos] {
+        b'v' => search(grid, seen, pos.south(), steps),
+        b'^' => search(grid, seen, pos.north(), steps),
+        b'>' => search(grid, seen, pos.east(), steps),
+        b'<' => search(grid, seen, pos.west(), steps),
+        b'.' => grid
+            .adj4(&pos)
+            .map(|pos| search(grid, seen, pos, steps))
+            .fold(0, std::cmp::max),
+        _ => 0,
+    };
+    seen[pos] = false;
+
+    return result;
+}
+
+fn search_p2(grid: &Grid<u8>, seen: &mut Grid<bool>, pos: Pos, steps: usize) -> usize {
+    let destination = Pos {
+        x: grid.height - 1,
+        y: grid.width - 2,
+    };
+
+    if pos == destination {
+        return steps;
+    }
+
+    if seen[pos] {
+        return 0;
+    }
+
+    seen[pos] = true;
+    let result = match grid[pos] {
+        b'#' => 0,
+        _ => grid
+            .adj4(&pos)
+            .map(|pos| search(grid, seen, pos, steps + 1))
+            .fold(0, std::cmp::max),
+    };
+    seen[pos] = false;
+
+    return result;
+}
+
+type Node = u8;
+type Graph = Vec<Vec<(Node, u32)>>;
+
+fn find_longest_path(
+    graph: &Graph,
+	mut seen: u64,
+    source: Node,
+    dest: Node,
+    distance: usize,
+) -> usize {
+    if source == dest {
+        return distance;
+    }
+
+	seen |= 1 << source;
+    let mut result = 0;
+    for (next, dist) in graph[source as usize].iter().copied() {
+        if seen & (1 << next) == 0 {
+            result = result.max(find_longest_path(
+                graph,
+                seen,
+				next,
+                dest,
+                distance + dist as usize,
+            ));
+        }
+    }
+
+    return result;
+}
+
+fn find_longest_path_no_rec(
+	graph: &Graph,
+	source: Node,
+	dest: Node
+) -> usize {
+	let mut stack = Vec::from([(source, 0u64, 0)]);
+	stack.reserve(63);
+	let mut result = 0;
+	while let Some((source, mut seen, distance)) = stack.pop() {
+		if source == dest {
+			result = result.max(distance);
+		} else {
+			seen |= 1 << source;
+			let v = unsafe { graph.get_unchecked(source as usize) };
+			for (next, dist) in v.iter().copied() {
+				if seen & (1 << next) == 0 {
+					stack.push((next, seen, distance + dist as usize));
+				}
+			}
+		}
+	}
+
+	result
+}
+
+fn construct_graph(grid: &Grid<u8>) -> (Graph, Node, Node) {
+    let mut seen = Grid::new(grid.height, grid.width, false);
+    let mut todo = Vec::new();
+    let mut next = Vec::new();
+    let mut graph = HashMap::new();
+
+    let destination = Pos {
+        x: grid.height - 1,
+        y: grid.width - 2,
+    };
+
+    let initial = Pos { x: 0, y: 1 };
+    todo.push((initial, initial, initial, 0));
+    while !todo.is_empty() {
+        for (pos, prev, mut last_node, mut dist) in todo.iter().copied() {
+            let is_node = 2 < grid.adj4(&pos).filter(|p| grid[*p] != b'#').count();
+
+            if is_node || pos == destination {
+                graph
+                    .entry(last_node)
+                    .or_insert(Vec::new())
+                    .push((pos, dist));
+                graph
+                    .entry(pos)
+                    .or_insert(Vec::new())
+                    .push((last_node, dist));
+                last_node = pos;
+                dist = 0;
+
+                if !seen[pos] {
+                    seen[pos] = true;
+                    for neigh in grid.adj4(&pos) {
+                        if neigh != prev && grid[neigh] != b'#' {
+                            next.push((neigh, pos, last_node, dist + 1));
+                        }
+                    }
+                }
+            } else {
+                for neigh in grid.adj4(&pos) {
+                    if neigh != prev && grid[neigh] != b'#' {
+                        next.push((neigh, pos, last_node, dist + 1));
+                    }
+                }
+            }
+        }
+
+        todo.clear();
+        todo.append(&mut next);
+    }
+
+    for v in graph.values_mut() {
+        v.sort();
+        let mut nv = Vec::new();
+        let mut last = v[0];
+        for &v in v.iter().skip(1) {
+            if v.0 != last.0 {
+                nv.push(last);
+            }
+            last = v;
+        }
+        nv.push(last);
+        v.clear();
+        v.append(&mut nv);
+    }
+
+    let node_idx: HashMap<Pos, u8> = graph.keys().copied().zip(0..).collect();
+    let start = node_idx[&initial];
+    let destination = node_idx[&destination];
+    let mut graph_vec = vec![Vec::new(); node_idx.len()];
+    graph
+        .iter()
+        .map(|(k, v)| {
+            (
+                node_idx[k],
+                v.iter()
+                    .map(|(n, dist)| (node_idx[n], *dist))
+                    .collect::<Vec<(Node, u32)>>(),
+            )
+        })
+        .for_each(|(node, adj)| {
+            graph_vec[node as usize] = adj;
+        });
+
+	// let m = graph_vec.iter().map(|v| v.len()).reduce(std::cmp::max).unwrap();
+
+	// let mut gridify = vec![(63, 0); 63 * graph_vec.len()];
+	// for (id, adjs) in graph_vec.iter().enumerate() {
+	// 	for (aid, adj) in adjs.iter().enumerate() {
+	// 		gridify[id * m + aid] = *adj;
+	// 	}
+	// }
+	// println!("{}", graph_vec.len());
+
+
+    (graph_vec, start, destination)
+}
+
+fn main() {
+    let filename = std::env::args().nth(1).unwrap();
+    let input = std::fs::read_to_string(filename).unwrap();
+    let width = input.lines().next().unwrap().len();
+    let buffer: Vec<_> = input.lines().flat_map(|line| line.bytes()).collect();
+    let height = buffer.len() / width;
+
+    let grid = Grid::from_buffer(buffer, width);
+    let mut seen = Grid::new(height, width, false);
+    let longest_path = search(&grid, &mut seen, Pos { x: 0, y: 1 }, 0);
+    println!("1) {}", longest_path);
+
+    let (graph, start, destination) = construct_graph(&grid);
+    //let part2 = find_longest_path(&graph, 0, start, destination, 0);
+	let part2 = find_longest_path_no_rec(&graph, start, destination);
+    println!("{}", part2);
+}