1 files changed, 132 insertions, 0 deletions
diff --git a/2024/day15.rs b/2024/day15.rs
new file mode 100644
index 0000000..f3c499e
--- /dev/null
+++ b/2024/day15.rs
@@ -0,0 +1,132 @@
+#![allow(dead_code)]
+#![allow(unused_variables)]
+#![allow(unused_mut)]
+use std::env;
+use std::fs::File;
+use std::io::Read;
+
+#[derive(Debug, PartialEq, Clone, Copy)]
+enum Field {
+    Wall,
+    Box,
+    Empty,
+}
+
+fn sim(rx: i64, ry: i64, dx: i64, dy: i64, mut m: &mut Vec<Vec<Field>>) -> (i64, i64) {
+    let mx = rx + dx;
+    let my = ry + dy;
+
+    let f = m[my as usize][mx as usize];
+    if f == Field::Empty {
+        return (mx, my);
+    } else if f == Field::Wall {
+        return (rx, ry);
+    }
+
+    let mut x = mx + dx;
+    let mut y = my + dy;
+    loop {
+        let f = m[y as usize][x as usize];
+        if f == Field::Wall {
+            return (rx, ry);
+        }
+        if f == Field::Empty {
+            m[my as usize][mx as usize] = Field::Empty;
+            m[y as usize][x as usize] = Field::Box;
+            return (mx, my);
+        }
+        x += dx;
+        y += dy;
+    }
+}
+
+fn gps(m: &Vec<Vec<Field>>) -> i64 {
+    let mut ret = 0;
+    for y in 0..m.len() {
+        for x in 0..m[0].len() {
+            if m[y][x] == Field::Box {
+                ret += 100 * y + x;
+            }
+        }
+    }
+    return ret as i64;
+}
+
+fn print_m(m: &Vec<Vec<Field>>) {
+    for l in m {
+        for f in l {
+            match f {
+                Field::Box => print!("O"),
+                Field::Empty => print!("."),
+                Field::Wall => print!("#"),
+            }
+        }
+        println!();
+    }
+}
+
+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 (para1, para2) = content.trim_end().split_once("\n\n").unwrap();
+
+    let mut rx = 0;
+    let mut ry = 0;
+    let mut m: Vec<Vec<Field>> = Vec::new();
+    for (y, line) in para1.split("\n").enumerate() {
+        let mut l: Vec<Field> = Vec::new();
+        for (x, c) in line.chars().enumerate() {
+            let x = x as i64;
+            let y = y as i64;
+            if c == '@' {
+                rx = x;
+                ry = y;
+            }
+
+            if c == 'O' {
+                l.push(Field::Box);
+            } else if c == '#' {
+                l.push(Field::Wall);
+            } else {
+                l.push(Field::Empty);
+            }
+        }
+        m.push(l);
+    }
+
+    let mut dirs: Vec<(i64, i64)> = Vec::new();
+    for line in para2.split("\n") {
+        for c in line.chars() {
+            let d = match c {
+                '<' => (-1, 0),
+                '>' => (1, 0),
+                '^' => (0, -1),
+                'v' => (0, 1),
+                _ => panic!(),
+            };
+            dirs.push(d);
+        }
+    }
+    //println!("{:?}", dirs);
+
+    for dir in dirs {
+        (rx, ry) = sim(rx, ry, dir.0, dir.1, &mut m);
+        //print_m(&m);
+    }
+
+    let res1 = gps(&m);
+
+    let mut res2 = 0;
+
+    println!("res1: {}", res1);
+    println!("res2: {}", res2);
+    //assert_eq!(res1, 1414416);
+    //assert_eq!(res2, );
+}