day 12. BETTER

day12/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day12"
+version = "0.1.0"

day12/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day12"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day12/data.txt

@@ -0,0 +1,41 @@
+abcccccccccccccccccccccccccccccccccccccccccccccccccccaaaaacccccccccccccaaaaaaaccccccccccccccccaaaaaaccccccccccccccccccccccccccaaaaacccaaaccccccccccccccccccccccccccccccaaaaa
+abcccccccccaaaccccccccccccaaaccccccccccccccccccccccccaaaaaacccccccccccccaaaaaaaaaaaccaaaaccccaaaaaaacccccccccccccccccccccccccccaaaaaacaaaaccccccccccccccccccccccccccccccaaaa
+abcccccccccaaaaaacccccccccaaaacccccccccccccccccccccccaaaaaaccccccccccccaaaaaaaaaaaccaaaaacccaaaaaacccccccccaaacccccccccccccccaaaaaaaacaaaaccccccccccccccccacccccccccccccaaaa
+abcccccccccaaaaaacccccccccaaaaccccaacccccccccccccccccaaaaaaccccccccccaaaaaaaaaaaaaacaaaaaaccaacaaaccaacccaaaaaaccccccccccccccaaaaaaaacaaaccccccccccaccccaaaccccccccccccaaaaa
+abcccccccaaaaaaaccccccccccaaaacccaaaaccccccccccccaaccccaaacccccccaaacaaaaaaaaaccccccaaaaaacccccaaaccaacccaaaaaacccccccccccccccccaaccccccccccccccccaaacccaaaccccccccccccaaaca
+abcccccccaaaaaaacccccccaaacccccccaaaacccccccaaccaaaccccccccccccaaaaacaaaaaaaaaccccccaaaaaccccccccaaaaaaaacaaaaaccaacaaccccccccccaaccccccccccccccccaaaaaaaaaccccccccccccccccc
+abcccccccccaaaaaaccaaccaaacccccccaaaacccccccaaaaaaaccccccccccccaaaaaaccccaaaaaacccccccaaaccccccccaaaaaaaaaaaaacccaaaaacccccccaaaccccccccccccccccccaaaaaaaackcccccccccccccccc
+abcccccccccaaaaaaccaaaaaaaccccccccccccccccccaaaaaacccccccccccccaaaaaaccccaaaaaaccccccccccccccccccccaaaaccaaaaaccccaaaaaccccccaaaaaccccaaaaaccccccccaaaajjkkkkkccccccaacccccc
+abcccccccccaaccccccaaaaaaccccccccccccccccccccaaaaaaaaccccccccccaaaaacccaaaacaaccccccccccccccccccccaaaaaccccccccccaaaaaacccccaaaaaaccccaaaaaccciijjjjjjjjjkkkkkkccaaaaaaccccc
+abcaaaccccccccccccccaaaaaaaaccccccccccccccccaaaaaaaaacccccccccccaaaacccaaaccaaccccccccccccccccccccaacaaacccccccccaaaacccccccaaaaaacccaaaaaaciiiijjjjjjjjjoopkkkkcaaaaacccccc
+abaaaacccccccccccccaaaaaaaaaccccccccccccccccaaaaaaaacccccccccccccccccccaaaaaaaccccaccaccccccccccccacccaacccccccccccaaccccccccaaaaacccaaaaaaiiiiiijjjjjjoooppppkkcaaaaaaacccc
+abaaaaaccccccccccccaaaaaaaaccccccccccccccccaaaaaaaccccccccccccccccccccccaaaaaaccccaaaacccccccccccccccccccccccccccccccccccccccaaaaccccaaaaaiiiinnnoooooooooppppkkkaaaaaaacccc
+abaaaaacccccccccccaaaaaaaccccccccccccccccccccccaaacccccccccccccccccccaaaaaaaacccccaaaaccccccccccccaaccaacccccaccccacccccccccccccccccccaaaciiinnnnoooooooouupppkkkaaaaaaacccc
+abaaaaccccccccccccccccaaaccccccccccccccccccccccaaacccccccaaccccccccccaaaaaaaaacccaaaaaacccccccccccaaaaaaccccaaaaaaaacccccccccccccaaccccccciiinnnntttooouuuuupppiiacaaacccccc
+abaaaacccccccccccccccccaaccccccccccccccccccccccccccccccaaaacacccccccccaaaaaaaacccaaaaaacccccccccccaaaaaccccccaaaaaacccccccccccaaaaaacccccciinnnttttuuuuuuuuuuppiiccaaacccccc
+abcccccccccccccccccccccccccccccccccccccccccccccccccccccaaaaaacccccccccccaaaaaaaccccaacccccaaccccccaaaaaacccccaaaaaacccccccccccaaaaaccccccciinnntttttuuuuxyuuuppiiicccccccccc
+abccccccccccccccccccccccccccccccccccccaaacccccccaaccccccaaaaccccccccccccaaccccccccccccccccaacaaacaaaaaaaacccaaaaaaaaccccccccccaaaaaaaccccchinnnttxxxxuuxyyyuuppiiiiccccccccc
+abccccccccccccccccccccccccccccccccccccaaaaaaccccaaacccccaaaaccccccccccccaaccccccccccccccccaaaaaccaaaaaaaaccaaaaaaaaaaccccccccaaaaaaaaccccchhhnnttxxxxxxxyyuvppppiiiccccccccc
+abccccccccccccccccccccccccccccccccccaaaaaaaaaaccaaaaaaacacaacccccccccccccccccaaaccccccccaaaaaaccccccaacccccaaaaaaaaaaccccccccaaaaaaaaccccchhhnntttxxxxxxyyvvvppqqiiicccccccc
+abccccccccccccccccccccccccccccaacaccaaaaaaaaaaaaaaaaaaacccccccccccccccccccccaaaaaaccccccaaaaaaacccccaacccccaccaaaaacacccccccccacaaaccccccchhhnnnttxxxxxyyyvvvvqqqqiiiccccccc
+SbccccccccccccccccccccccccccccaaaaccaaaaaaacaaaaaaaaaaccccccccccccccccccccccaaaaaaccccccccaaaaaaccccccccccccccaaaaccccccccccccccaaacccccchhhmmmtttxxxEzzyyyyvvvqqqqiiccccccc
+abcccccccccccccccccccccccccccaaaaaccccaaaaaccaaaaaaaaacccccccccccccccaaaaaccaaaaaaccccccccaaccaacccccccccccccccaacccccccaaaaccccccccccccchhhmmmtttxxxyyyyyyyyvvvqqqjjjcccccc
+abcccaaacccccccccccccccccccccaaaaaacccaacaaaaaaaaaaaaacccccccccccccccaaaaacccaaaaaccccccccaacccccccccccccccccccccccccccaaaaacccccccccccchhhmmmttsxxyyyyyyyyvvvvvqqqjjjcccccc
+abcccaaaaaacccaacaaccccccccccacaaaacccaacccaaaaaaaaaaaacccccccccccccaaaaaacccaacaaccccccccccccccccccccccccccccccccaacccaaaaaaccccccccccchhhmmmssxxwwwwyyywvvvvvqqqjjjjcccccc
+abccaaaaaaacccaaaaaccccccccccccaaccccccccccaaaaaaaccaaccccccccccccccaaaaaacccccccccccccccccccccccccccccccccccaaccaaacccaaaaaacccccccaaachhhmmssswwwwwwyyywvvqqqqqqjjjccccccc
+abcaaaaaaacccccaaaaacccccccccccccccccccccccccccaaaccccccccccccccccccaaaaaacccccccccccaaccccaaccccccccccccccccaaacaaacccaaaaaacccccccaaacgggmmsssswwwswwyywwrrqqqjjjjcccccccc
+abcaaaaaaaccccaaaaaacccccccccccccccccccccccaaccaaaccccccccccccccccccccaaccccccccccccaaccccaaaacccccccccccccccaaaaaaccccccaacccccccaacaaagggmmmssssssswwwwwwrrqjjjjjddccccccc
+abcccaaaaaacccaaaacccccccccccccccccccccccccaaacaaccccccccccccccccccccccccccccccccaaaaacaacaaaaccccccccccccccccaaaaaaaaccccccccccccaaaaaagggmmmmssssssswwwwrrrkjjjjddddcccccc
+abcccaaaaaacccccaaccccccccccccccccccccccccccaaaaaccccccccccccccccccccccccccccccccaaaaaaaacaaaacaaccccccaaccaaaaaaaaaaacccccccccccccaaaaaggggmmmmllllsrrwwwrrkkkjdddddaaacccc
+abcccaaaccccccccccccaacccccccccccccccccccccaaaaaaccccccccccccccccccccccccccccccccccaaaaacccccccaaaaaaccaaaaaaaaaaaaaacccccccccccccccaaaaaggggmmllllllrrrrrrrkkkdddddaaaccccc
+abccccaaaaaaccccccccaacaaaccccccccacccaaccaaaaaaaaccccccccccaaaccccccaacccccccccccaaaaaccccccccaaaaacccaaaaaaaaaaaaccccccccccccccccaaacaacggggggflllllrrrrrrkkddddaaaaaccccc
+abccccaaaaacccccccccaaaaacccccccccaaaaaaccaaaaaaaaccccccccccaaacacccaaaaccccccccccaacaaacccccaaaaaaccccaaaaaaaccaaacccccccccccccccccaacccccggggffffllllrrrrkkkdddaaaaaaacccc
+abccaaaaaaacccccccaaaaaaccccccccccaaaaaccccccaacccccaaccccaacaaaaaccaaaacccccccaaccccaaccccccaaaaaaaccaaaaaaaaccaaaccccccccccccccccccaaaccccccgffffflllkkkkkkeedaaaaaaaacccc
+abccaaaaaaacccccccaaaaaaacccccccccaaaaaacccccaacccccaaacccaaaaaaaaccaaaacccaaaaacccccccccccccccaaaaaacaaaaaaaacccccccccccccccccccccccaaaacaacccccffffllkkkkkeeedccaaaaaacccc
+abccccaaaaaaccccccccaaaaaacccccccaaaaaaaacccccaaccccaaaaaaaaaaaaccccccccccaaaaaaaacccccccccccccaaccaaccccaaaccccccaacccccccccccccccccaaaaaaaccccccfffffkkkkeeeecccaacccccccc
+abccccaaccaaccccccccaaccaacccccccaaaaaaaacccccaaccaaaaaaaaccaaaaacccccccccaaaaaaaaccccccccccaacaaccccccccaaccccaacaaaccccaacccccccccccaaaaaaccccccaafffeeeeeeecccccccccccccc
+abccccaaccccccccccccaaccccccccccccccaacccccaaaaaaaaaaaaaaacaaacaaaaaaacaccaaaaaaacccccccaaacaacccccccccccccccccaaaaaccccaaaacccccccaaaaaaaaccccccaaaaffeeeeeeeccccccccccccca
+abacccccccccccccaaacccccccccccccccccaacccccaaaaaaaaaaaaaacccaaccaaaaaaaaaaaaaccaaacccccccaaaaaccccccccccccccccccaaaaaaccaaaacccccccaaaaaaaaaccccccaaacceeeeeccccccccccccccaa
+abaaccccccccccaaaaaacccccccccccccccccccccccccaaaacccaaaaaaccccccaaaaaaaaaaaaaaaaaaaccccccaaaaaaacccaaaccccccccaaaaaaaaccaaaaccccccccaaaaaaaaccccccccccccaaacccccccccccaaacaa
+abaaccccccccccaaaaaacccccccccccccccccccccccccaaaaacaaaaaaaccccccaaaaaaaaaaaaaaaaaaccccccaaaaaaaaccccaaaaccccccaaaaacaaccccccccccccccccaaaaaaacccccccccccacacccccccccccaaaaaa
+abacccccccccccaaaaaaccccccccccccccccccccccccaaaaaacaaaccaaccccccaaaaaaccaaaaaaaaccccccccaaaaaaaaccaaaaaacccccccccaaaccccccccccccccccccaacccccccccccccccccccccccccccccccaaaaa

day12/src/main.rs

@@ -0,0 +1,112 @@
+use std::collections::HashMap;
+use std::collections::HashSet;
+use std::collections::VecDeque;
+
+fn main() {
+    let contents = std::fs::read_to_string("data.txt").expect("Failed to read file");
+    let map = contents
+        .lines()
+        .map(|x| x.chars().collect::<Vec<char>>())
+        .collect::<Vec<Vec<char>>>();
+
+    let start = find(&map, 'S').unwrap();
+    let mut visited: HashSet<(usize, usize)> = HashSet::new();
+
+    // Part 1
+    let distance = explore(&map, start, &mut visited);
+    println!("Part 1 distance: {distance}");
+
+    // Part 2
+    let distance = find_all(&map, 'a').into_iter().map(|s| {
+        let mut v: HashSet<(usize, usize)> = HashSet::new();
+        explore(&map, s, &mut v)
+    }).filter(|&d| d != 0).reduce(usize::min).unwrap();
+    println!("Part 2 distance {:?}", distance);
+}
+
+fn explore(
+    map: &Vec<Vec<char>>,
+    start: (usize, usize),
+    visited: &mut HashSet<(usize, usize)>,
+) -> usize {
+    let mut queue = VecDeque::new();
+    let mut steps: HashMap<(usize, usize), usize> = HashMap::new();
+
+    visited.insert(start);
+    queue.push_back(start);
+    steps.insert(start, 0);
+
+    while queue.len() > 0 {
+        let coord = queue.pop_front().unwrap();
+        let mut val = map[coord.0][coord.1];
+        if val == 'S' {
+            val = 'a';
+        }
+
+        for n in neighbors(&coord, &map) {
+            let n_val = map[n.0][n.1];
+            let n_val = if n_val == 'E' { 'z' } else { n_val };
+            let can_travel = (val <= n_val && n_val as u8 - val as u8 <= 1) || val as u8 > n_val as u8;
+            if !visited.contains(&n) && can_travel {
+                visited.insert(n);
+                queue.push_back(n);
+                let distance = steps.get(&coord).unwrap() + 1;
+                steps.insert(n, distance);
+
+                if map[n.0][n.1] == 'E' {
+                    queue.clear();
+                    return distance;
+                }
+            }
+        }
+    }
+
+    0
+}
+
+fn neighbors(coord: &(usize, usize), map: &Vec<Vec<char>>) -> Vec<(usize, usize)> {
+    let mut coords = vec![];
+
+    if coord.0 > 0 {
+        coords.push((coord.0 - 1, coord.1));
+    }
+    if coord.1 > 0 {
+        coords.push((coord.0, coord.1 - 1));
+    }
+    if coord.0 < map.len() - 1 {
+        coords.push((coord.0 + 1, coord.1));
+    }
+    if coord.1 < map[0].len() - 1 {
+        coords.push((coord.0, coord.1 + 1));
+    }
+
+    coords
+}
+
+fn find(map: &Vec<Vec<char>>, val: char) -> Option<(usize, usize)> {
+    for i in 0..map.len() {
+        let line = &map[i];
+        for j in 0..line.len() {
+            if map[i][j] == val {
+                return Some((i, j));
+            }
+        }
+    }
+
+    None
+}
+
+fn find_all(map: &Vec<Vec<char>>, val: char) -> Vec<(usize, usize)> {
+    let mut coords = vec![];
+
+    for i in 0..map.len() {
+        let line = &map[i];
+        for j in 0..line.len() {
+            if map[i][j] == val {
+                coords.push((i, j));
+            }
+        }
+    }
+
+    coords
+}

day12/test.txt

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