feat: day 12 (over 1h)

.aoc-cache/12.txt

@@ -0,0 +1,41 @@
+abcccccccccccaaaaacccccccaaaaaaccccccccccccccccccccccccccccccccaaaaaaaaaaaaaacccccccccccccccccccaaaaaacccccccacccccccccaaccaaccccccccccccccccccccccccccccccaaaaaa
+abcccccccccccaaaaaaacccccaaaaaaccccccccaaccccccccccaaaaccccccccaaaaaaaaaaaaaccccccccccccccccccccaaaaaaccccaaaacccccccccaaaaaaccccccccccccccccccccccccccccccccaaaa
+abccccccccccaaaaaaaacccccaaaaaccccccccaaaacccccccccaaaacccccccccccaaaaaaacccccccccccccccccccccccaaaaacccccaaaaaaccccccccaaaaacccccccccccaaaccccccccccccccccccaaaa
+abccccccccccaaaaaaaaccccccaaaaacccccccaaaacccccccccaaaacccccaaaccccaaaaaaccccccccccccccccccccccccaaaaacccccaaaaacccccccaaaaaacccccccccccaaaacccccccccccccccccaaaa
+abccccccccccaaaaaaccccccccaaaaacccccccaaaaccccccccccaaacccccaaaaccaaaaaaaacccccccccccccccccccccccaaaaaccccaaaaacccccccaaaaaaaaccccccccccaaaaccaaccccccccccccaaaaa
+abcccccccccccccaaaccccccccccccccccccccccccccccccccccccccccccaaaaccaaaaaaaaccccccccccccccccccccccccccccccccaccaaccccaaaaaaaaaaacccccccccccaaaaaaccccccccccccccaccc
+abcacccccccccccccaaaccccccccccccccaaacccccccccccccccccccccccaaaccaaaacccaaacccccccccccccccccccccccaacccccccccccccccaaacccaaccccccccccccccaaaalllllccccccccccccccc
+abaacccccccccccccaaaaaacccccccccccaaaccccccccccccccccccccccccccccaaaccccaaaccccccccccccccccccccccaaccccccccccccccccaaaaaaaaccccccccccccccckklllllllccccaaaccccccc
+abaaaaacccccccccaaaaaaacccccccccaaaaaaaacccccaacccccccccccccccccccccccccaaaccccccccaacccccccccaaaaacaacaacaacccccaaaaaaaaccccccccccccaaakkkkllllllllcccaaaccccccc
+abaaaaaccccccccaaaaaaaacccccccccaaaaaaaacccccaaaaaacccccccccccccccccccccaaaccccccaaaacacccccccaaaaaaaacaaaaaccccaaaaaaaaaccccccccckkkkkkkkkklsssslllcccaaaaaacccc
+abaaaccccccccccaaaaaaacccccccccccaaaaacccccccaaaaaaccccccccccccccccccaaaaaaaaccccaaaaaacccccccccaaaaacaaaaacccccaaaaaaaacccaaaccjjkkkkkkkkkssssssslllcccaaaaacccc
+abaaaccccccccccccaaaaaacccccaacccaaaaaaccccaaaaaaaccaaaccccccccccccccaaaaaaaacccccaaaacccccccccaaaaaccaaaaaacccccccaaaaaaccaaaajjjjkkkkkkssssssssslllcddaaaaccccc
+abcaaacccccccccccaaaaaacaaacaacccaaaaaaccccaaaaaaaaaaaaaaccccccccccccccaaaaaccccccaaaaccccaaaaaaacaaacccaaaaaaacccaaaaaaaccaaajjjjrrrrrrssssuuuussqmmddddaaaccccc
+abccaacccccccccccaaccccccaaaaacccaaaccaccccaaaaaaaaaaaaaacccccccccccccaaaaaacccccaacaaccccaaaaacccaaccccacccaaaaaaaaaccaaccaaajjjrrrrrrrrssuuuuuvqqmmmdddaaaccccc
+abccccccccaaccccccccccccccaaaaaacccccccccccccaaaaaaaaaaaccccccccccccccaaaaaacccccccccccccaaaaaaccccccccccccaaaaaaaaaacccccccccjjjrrruuuuuuuuuuuvvqqmmmmddddaccccc
+abaacccccaaaaccccccccccccaaaaaaacccccccccccccaacccccaaaaacccccccccccccaccaaacccccccccccccaaaaaacccccccccccaaaaaaaaccccccccccccjjjrrruuuuuuuuxyyvvqqqmmmddddcccccc
+abaacccccaaaacccccccccccaaaaaaccccccccaaccccccccacccaaaaacccccccccccccccccccccccccccccccccaaaaacccccccccccaaaaaaacccccccccccccjjjrrttuxxxxuxxyyvvqqqqmmmmddddcccc
+abaacccccaaaacccccccccccaacaaacccccaaaaacccaaaaaaaccccccccccccccccccccccccccccccccccccccccaaacccccccccccccccaaaaaaccccccccccccjjjrrtttxxxxxxyyyvvqqqqqmmmmdddcccc
+abacccccccccccccccccccccccccaaccccccaaaaaccaaaaaaaccccccccaaccccccccccccccccccccccccccccccccccccccccccccccccaaaaaaccccccccccccjjjqrrttxxxxxxyyyvvvvqqqqmmmdddcccc
+abccccccccccccccccccccccccccccccccccaaaaaccaaaaaaacccccccaaaccccccccccaaaccccccccccccccccccaaaccccccccccccccaaccccccccccaaccccjjjqqqtttxxxxxyyyyyvvvqqqqmmmeeeccc
+SbaaccccccaccaaacccccccccccccccccccaaaaacccaaaaaaaaccccaaaaaaaacccccccaaacaaccccccccccccccaaaaaaccccccccccccccccccccccaaaaaaccciiiqqqttxxxxEzyyyyyvvvqqqnnneeeccc
+abaaccccccaaaaaaccccccccccccccccccccccaaccaaaaaaaaaacccaaaaaaaacccccaaaaaaaaccccccccccccccaaaaaaccccccccccccccccccccccaaaaaaccciiiqqtttxxxyyyyyyyvvvvqqqnnneeeccc
+abaaaaacccaaaaaaccccccccccccccccccccccccccaaaaaaaaaaccccaaaaaaccccccaaaaaaaaccccccccccccccaaaaaacccccccccccccccccccccccaaaaacciiiqqqttxxyyyyyyywvvvvrrrqnnneeeccc
+abaaaaacccaaaaaaaccccccccaaaccccccccccccccaacaaaccccccccaaaaaaccccccaaaaaaaccccccccccccccccaaaaaccccccccccccccccccccccaaaaaccciiiqqtttxxxyyyyywwwvrrrrrnnneeecccc
+abaaaccccaaaaaaaaccccccccaaaacccccccccccccccccaaccccccccaaaaaaccccccccaaaaaccccccccccccccccaacaaccccccccccccccccccccccaaaaaccciiqqqttxxxwwwwyyywwrrrrnnnnneeecccc
+abaaaccccaaaaaaaaccccccccaaaacccccaaaaacccccccaaccccccccaaccaacccccccaaacaaacccccccccccccccccccccccccccccccccccccccccccccccccciiqqqtttwwwwwwywwwrrrrnnnnneeeccccc
+abcaaaccccccaaaccccccccccaaaccccccaaaaacccccccccccccaaaaccccccccccccccaacccccccccccccccccccccccccccccccaaaacccccccccccccccccciiiqqqtttssssswwwwwrrrnnnneeeecccccc
+abccaaccccccaaaccccccccccccccccccaaaaaacccccccccccccaaaaccccccccccccccccccccccccccccccccccccccccccccccaaaaacccccccccccccccccciiiqqqqtssssssswwwwrronnnfeeeacccccc
+abcccccccccccccccccccccccccccccccaaaaaacccccccccccccaaaaccccccccccccccccccccccccccccccccccccccccccccccaaaaaaccccccccccccccccciiiiqqppssssssswwwwrroonfffeaacccccc
+abcccccccccccccccccccccccccccccccaaaaaacaaaccccccccccaacccccccccccccccccccccccccccccccccaaacccccccccccaaaaaaccccccccccccccccccihhpppppppppsssssrrroonfffaaaaacccc
+abcccccccccccccccccccccccccccccccccaacccaaaaacccccccccccccccccccccccccccccccccccccccccccaaaaaaccccccccaaaaaccccccccccccccccccchhhhppppppppppssssrooofffaaaaaacccc
+abccccccccaaaccccccccccccccccccccccccccaaaaacccccccccccccccccccccccccccccccccccccaccccaaaaaaaaccccccccccaaacccccccccccccccccccchhhhhhhhhpppposssoooofffaaaaaccccc
+abccccccccaaaacccccaaccccccccccccccccccaaaaaccccccccccccccccccccccccaaccccccccccaaccccaaaaaaaacccccccccccccccccccccccccccccccccchhhhhhhhhgppooooooofffaaaaacccccc
+abaaccccccaaaacccccaacaaccccccccccccccccaaaaacccccccccccccccaacaaccaaaaaaccccaaaaacaacaaaaaaacccccccccccccccccccccccccccccccccccccchhhhhhgggooooooffffaaaaaaccccc
+abaaacccccaaaacccccaaaaaccccccccccccccccaaccccccccccccccccccaaaaaccaaaaaaccccaaaaaaaacccaaaaaccccccccccccccccccccccccaaacaacccccccccccccgggggooooffffccccaacccccc
+abaaaccccccccccccaaaaaaccccaaccccccccccccccccccaaacccccccccccaaaaaaaaaaaacaacccaaaaaccccaacaaacccccccccccccccccccccccaaaaaaccccccccccccccaggggggggfffcccccccccccc
+abaaaccccccccccccaaaaaaaacaaaaccccccccaaaccccccaaaacccccccccaaaaaaaaaaaaaaaaccaaaaacccccaaaaaccccccccccccccaaccccccccaaaaaaccccccccccccccaagggggggfccccccccccccca
+abaacccccccccccccaccaaaaacaaaaccccccccaaaccccccaaaacccccccccaaaaccaaaaaaaaaaccaacaaaccccccaaaccccccccccccaaaaaacccccaaaaaaacccccccccccccaaaaccggggcccccccccccccaa
+abaacccccccccccccccaaacaccaaaacccccaaaaaaaaccccaaaccccccccccccaaccaaaaaaaacccccccaacccccaacaaaaacccccccccaaaaaacccccaaaaaaaaccccccccccccaaaccccccccccccccccaaacaa
+abcccccccccccccccccaaccccccccccccccaaaaaaaaccccccccccccccccccccaaaaaaaaaaaccccccccccccccaaaaaaaacccccccccaaaaaacccccaaaaaaaaccccccccccccacaccccccccccccccccaaaaaa
+abccccccccccccccccccccccccccccccccccaaaaaacccccccccccccccccccccaaaaaaaaaaaaccccccccccccccaaaaaaccccccccccaaaaaccccccccaaacccccccccccccccccccccccccccccccccccaaaaa

Cargo.lock

@@ -32,6 +32,7 @@ version = "0.1.0"
 dependencies = [
  "aoc_proc",
  "color-eyre",
+ "petgraph",
  "regex",
  "time",
  "ureq",
@@ -45,6 +46,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
 [[package]]
 name = "backtrace"
 version = "0.3.66"
@@ -136,6 +143,12 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "fixedbitset"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
+
 [[package]]
 name = "flate2"
 version = "1.0.25"
@@ -161,6 +174,12 @@ version = "0.26.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "22030e2c5a68ec659fde1e949a745124b48e6fa8b045b7ed5bd1fe4ccc5c4e5d"
 
+[[package]]
+name = "hashbrown"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+
 [[package]]
 name = "idna"
 version = "0.3.0"
@@ -177,6 +196,16 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ce23b50ad8242c51a442f3ff322d56b02f08852c77e4c0b4d3fd684abc89c683"
 
+[[package]]
+name = "indexmap"
+version = "1.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1885e79c1fc4b10f0e172c475f458b7f7b93061064d98c3293e98c5ba0c8b399"
+dependencies = [
+ "autocfg",
+ "hashbrown",
+]
+
 [[package]]
 name = "js-sys"
 version = "0.3.60"
@@ -258,6 +287,16 @@ version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "478c572c3d73181ff3c2539045f6eb99e5491218eae919370993b890cdbdd98e"
 
+[[package]]
+name = "petgraph"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6d5014253a1331579ce62aa67443b4a658c5e7dd03d4bc6d302b94474888143"
+dependencies = [
+ "fixedbitset",
+ "indexmap",
+]
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.9"

Cargo.toml

@@ -14,3 +14,4 @@ aoc_proc = { path = "aoc_proc" }
 ureq = "2.5.0"
 time = "0.3.17"
 regex = "1.7.0"
+petgraph = "0.6.2"

src/bin/day_12.rs

@@ -0,0 +1,138 @@
+use std::fmt::Debug;
+
+use petgraph::dot::{Config, Dot};
+use petgraph::graph::{NodeIndex, DiGraph};
+use petgraph::algo::dijkstra;
+
+use aoc_2022::prelude::*;
+
+type Input = Vec<Vec<char>>;
+
+fn parse(s: &str) -> Result<Input> {
+    Ok(s.lines().map(|line| line.chars().collect()).collect())
+}
+
+#[aoc(day = 12, parse = parse, test_cases = ["day_12.txt"])]
+fn day_12(input: Input) -> Result<()> {
+    let map_w = input[0].len();
+    let map_h = input.len();
+
+    let (graph, (start, end)) = build_graph((map_w, map_h), &input);
+    if std::env::var("PRINT_GRAPH").is_ok() {
+        println!("{:?}", Dot::with_config(&graph, &[Config::EdgeNoLabel]));
+    }
+
+    // Part 1
+    let map = dijkstra(&graph, Pos(start.0,start.1).into(), Some(Pos(end.0,end.1).into()), |_| 1);
+    eprintln!("Part one: {}", map.get(&Pos(end.0,end.1).into()).unwrap());
+
+    // Part 2
+    let starts = find_starts((map_w, map_h), &input);
+    let min = starts.into_iter().filter_map(|start| {
+        let map = dijkstra(&graph, start.into(), Some(Pos(end.0,end.1).into()), |_| 1);
+        map.get(&Pos(end.0,end.1).into()).cloned()
+    }).min().unwrap();
+    eprintln!("Part two: {min}");
+
+    Ok(())
+}
+
+fn find_starts((map_w, map_h): (usize, usize), input: &Input) -> Vec<Pos> {
+    let mut starts = vec![];
+    for x in 0..map_w {
+        for y in 0..map_h {
+            if matches!(input[y][x], 'a' | 'S') {
+                starts.push(Pos(x, y));
+            }
+        }
+    }
+    starts
+}
+
+#[derive(Default)]
+struct Pos(usize, usize);
+
+impl Debug for Pos {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{},{}", self.0, self.1)
+    }
+}
+
+impl Into<NodeIndex> for Pos {
+    fn into(self) -> NodeIndex {
+        NodeIndex::new(self.0 * 1000 + self.1)
+    }
+}
+
+fn build_graph((map_w, map_h): (usize, usize), input: &Input) -> (DiGraph<Pos, ()>, ((usize,usize), (usize,usize))) {
+    let mut edges = vec![];
+
+    let mut start = None;
+    let mut end = None;
+    for x in 0..map_w {
+        for y in 0..map_h {
+            let h = input[y][x];
+
+            match h {
+                'S' => start = Some((x, y)),
+                'E' => end = Some((x, y)),
+                _ => {},
+            }
+
+            if x > 0 {
+                let (nx, ny) = (x - 1, y);
+                let h2 = input[ny][nx];
+                let h = if h == 'S' { 'a' } else if h == 'E' { 'z' } else { h };
+                let h2 = if h2 == 'S' { 'a' } else if h2 == 'E' { 'z' } else { h2 };
+                let h = (h as usize) - ('a' as usize);
+                let h2 = (h2 as usize) - ('a' as usize);
+                if h >= h2 || h2 - h == 1 {
+                    edges.push((Pos(x, y), Pos(nx, ny)));
+                }
+            }
+
+            if y > 0 {
+                let (nx, ny) = (x, y - 1);
+                let h2 = input[ny][nx];
+                let h = if h == 'S' { 'a' } else if h == 'E' { 'z' } else { h };
+                let h2 = if h2 == 'S' { 'a' } else if h2 == 'E' { 'z' } else { h2 };
+                let h = (h as usize) - ('a' as usize);
+                let h2 = (h2 as usize) - ('a' as usize);
+                if h >= h2 || h2 - h == 1 {
+                    edges.push((Pos(x, y), Pos(nx, ny)));
+                }
+            }
+
+            if x < map_w - 1 {
+                let (nx, ny) = (x + 1, y);
+                let h2 = input[ny][nx];
+                let h = if h == 'S' { 'a' } else if h == 'E' { 'z' } else { h };
+                let h2 = if h2 == 'S' { 'a' } else if h2 == 'E' { 'z' } else { h2 };
+                let h = (h as usize) - ('a' as usize);
+                let h2 = (h2 as usize) - ('a' as usize);
+                if h >= h2 || h2 - h == 1 {
+                    edges.push((Pos(x, y), Pos(nx, ny)));
+                }
+            }
+
+            if y < map_h - 1 {
+                let (nx, ny) = (x, y + 1);
+                let h2 = input[ny][nx];
+                let h = if h == 'S' { 'a' } else if h == 'E' { 'z' } else { h };
+                let h2 = if h2 == 'S' { 'a' } else if h2 == 'E' { 'z' } else { h2 };
+                let h = (h as usize) - ('a' as usize);
+                let h2 = (h2 as usize) - ('a' as usize);
+                if h >= h2 || h2 - h == 1 {
+                    edges.push((Pos(x, y), Pos(nx, ny)));
+                }
+            }
+        }
+    }
+
+    eprintln!("{}", edges.len());
+
+    let start = start.unwrap();
+    let end = end.unwrap();
+
+    (DiGraph::from_edges(edges), (start, end))
+}

test_cases/day_12.txt

@@ -0,0 +1,5 @@
+Sabqponm
+abcryxxl
+accszExk
+acctuvwj
+abdefghi