day20 part1

3 files changed, 267 insertions, 0 deletions

diff --git a/2024/day20.rs b/2024/day20.rs
new file mode 100644
index 0000000..a0549ef
--- /dev/null
+++ b/2024/day20.rs
@@ -0,0 +1,111 @@
+#![allow(dead_code)]
+#![allow(unused_variables)]
+#![allow(unused_mut)]
+use std::cmp::min;
+use std::collections::HashMap;
+use std::env;
+use std::fs::File;
+use std::io::Read;
+
+fn dfs(
+    mut score: i64,
+    sx: i64,
+    sy: i64,
+    ex: i64,
+    ey: i64,
+    m: &Vec<Vec<bool>>,
+    lut: &mut HashMap<(i64, i64), i64>,
+) -> i64 {
+    if sx == ex && sy == ey {
+        return score;
+    }
+
+    if let Some(val) = lut.get(&(sx, sy)) {
+        if *val < score {
+            return 99999999999;
+        }
+    }
+    lut.insert((sx, sy), score);
+
+    let mut s = 99999999999;
+
+    for (dx, dy) in [(1, 0), (-1, 0), (0, 1), (0, -1)] {
+        let mut x = sx + dx;
+        let mut y = sy + dy;
+        if m[y as usize][x as usize] {
+            let a = dfs(score + 1, x, y, ex, ey, &m, lut);
+            s = min(s, a);
+        }
+    }
+
+    return s;
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let filename = if args.len() == 1 {
+        "in/".to_owned() + args[0].split('/').last().unwrap() + ".pzl"
+    } else {
+        args[1].clone()
+    };
+    let mut f = File::open(filename).expect("cannot open file");
+    let mut content = String::new();
+    f.read_to_string(&mut content).expect("cannot read file");
+    let lines = content.trim_end().split("\n");
+
+    let mut sx = 0;
+    let mut sy = 0;
+    let mut ex = 0;
+    let mut ey = 0;
+    let mut m: Vec<Vec<bool>> = Vec::new();
+    for (y, line) in lines.enumerate() {
+        let mut l: Vec<bool> = Vec::new();
+        for (x, c) in line.chars().enumerate() {
+            if c == '#' {
+                l.push(false);
+            } else {
+                l.push(true);
+            }
+            if c == 'S' {
+                sx = x as i64;
+                sy = y as i64;
+            } else if c == 'E' {
+                ex = x as i64;
+                ey = y as i64;
+            }
+        }
+        //println!("{:?}", l);
+        m.push(l);
+    }
+    let width = m.len();
+    let height = m[0].len();
+    println!("{} {}", width, height);
+
+    let mut lut: HashMap<(i64, i64), i64> = HashMap::new();
+    let ref_score = dfs(0, sx, sy, ex, ey, &m, &mut lut);
+
+    let mut res1 = 0;
+    for y in 1..height - 1 {
+        for x in 1..width - 1 {
+            if m[y][x] == true {
+                continue;
+            }
+            let mut mc = m.clone();
+            mc[y][x] = true;
+            lut.clear();
+            let score = dfs(0, sx, sy, ex, ey, &mc, &mut lut);
+            if score + 100 <= ref_score {
+                res1 += 1;
+            }
+            println!("{}", score);
+        }
+    }
+
+    //print(&m, &hs);
+    let mut res2 = 0;
+
+    println!("res1: {}", res1);
+    println!("res2: {}", res2);
+    //assert_eq!(res1, 1422);
+    //assert_eq!(res2, );
+}
diff --git a/2024/in/day20.pzl b/2024/in/day20.pzl
new file mode 100644
index 0000000..cf184da
--- /dev/null
+++ b/2024/in/day20.pzl
@@ -0,0 +1,141 @@
+#############################################################################################################################################
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diff --git a/2024/in/day20.ref b/2024/in/day20.ref
new file mode 100644
index 0000000..c097dae
--- /dev/null
+++ b/2024/in/day20.ref
@@ -0,0 +1,15 @@
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