d12p1

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/input.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

day12/src/main.rs

@@ -0,0 +1,83 @@
+use std::env;
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::collections::BinaryHeap;
+use std::cmp::max;
+
+fn get(map: &Vec<Vec<i64>>, coord: (usize, usize)) -> i64 {
+    map[coord.0 as usize][coord.1 as usize]
+}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let mut map: Vec<Vec<i64>> = Vec::new();
+    let mut queue = BinaryHeap::new();
+    let (mut start, mut end) = ((0, 0), (0, 0));
+
+    // parse input
+    for (i, line) in io::BufReader::new(file).lines().flatten().enumerate() {
+        let mut row: Vec<i64> = Vec::new();
+        for (j, c) in line.chars().enumerate() {
+            match c {
+                'S' => { start = (i, j); row.push('a' as i64); },
+                'E' => { end = (i, j); row.push('z' as i64); },
+                c => row.push(c as i64),
+            }
+        }
+        map.push(row);
+    }
+    let (height, width) = (map.len(), map[0].len());
+    let mut costs = vec![vec![i64::MAX; width]; height];
+    let heur: Vec<Vec<i64>> = (0..height)
+        .map(|i| (0..width)
+            .map(|j|
+                max((i.abs_diff(end.0) + j.abs_diff(end.1)) as i64,
+                    get(&map, end) - get(&map, (i, j))))
+            .collect())
+        .collect();
+        
+    queue.push((-heur[start.0][start.1], start));
+    costs[start.0][start.1] = 0;
+
+    // A*
+    let answer = loop {
+        // no route
+        if queue.is_empty() {
+            break None;
+        }
+
+        let (_, (i, j)) = queue.pop().unwrap();
+        let cost = get(&costs, (i, j));
+
+        // found destination
+        if (i, j) == end {
+            break Some(cost);
+        }
+
+        // handle neighbors
+        let neighbors = [
+            (i as i64, (j as i64) - 1),
+            (i as i64, (j as i64) + 1),
+            ((i as i64) - 1, j as i64),
+            ((i as i64) + 1, j as i64)];
+        for (nexti, nextj) in neighbors {
+            if nexti < 0 || nextj < 0
+                || nexti >= height as i64 || nextj >= width as i64
+                || map[nexti as usize][nextj as usize] > map[i][j] + 1
+            {
+                continue;
+            }
+            let nexti: usize = nexti as usize;
+            let nextj: usize = nextj as usize;
+            let new_cost = cost + 1;
+            if new_cost < costs[nexti][nextj] {
+                costs[nexti][nextj] = new_cost;
+                queue.retain(|(_, (ri, rj))| *ri != nexti || *rj != nextj);
+                queue.push((-new_cost - heur[nexti][nextj], (nexti, nextj)));
+            }
+        }
+    };
+
+    println!("= {:?}", answer);
+}
+

day12/test.txt

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