1 files changed, 0 insertions, 105 deletions
diff --git a/2024/06/rust/src/main.rs b/2024/06/rust/src/main.rs
deleted file mode 100644
index ca78bcd..0000000
--- a/2024/06/rust/src/main.rs
+++ /dev/null
@@ -1,105 +0,0 @@
-use std::collections::HashSet;
-use std::{collections::HashMap, io};
-
-#[derive(Clone)]
-enum Cell {
-    Empty,
-    Obstacle,
-}
-
-#[derive(Clone)]
-enum Direction {
-    L = 0b1,
-    R = 0b10,
-    U = 0b100,
-    D = 0b1000,
-}
-
-impl Direction {
-    fn shift(&self, point: (isize, isize)) -> (isize, isize) {
-        let (x, y) = point;
-        match self {
-            Direction::L => (x - 1, y),
-            Direction::R => (x + 1, y),
-            Direction::U => (x, y - 1),
-            Direction::D => (x, y + 1),
-        }
-    }
-
-    fn rotate(&self) -> Self {
-        use Direction::*;
-        match self {
-            L => U,
-            R => D,
-            U => R,
-            D => L,
-        }
-    }
-}
-
-fn main() -> io::Result<()> {
-    let mut map = HashMap::new();
-    let mut start = None;
-    io::stdin()
-        .lines()
-        .flatten()
-        .enumerate()
-        .flat_map(|(y, line)| {
-            line.chars()
-                .enumerate()
-                .map(|(x, ch)| ([x as isize, y as isize], ch))
-                .collect::<Vec<_>>()
-        })
-        .for_each(|([x, y], ch)| match ch {
-            '.' => {
-                map.insert((x, y), Cell::Empty);
-            }
-            '^' => {
-                map.insert((x, y), Cell::Empty);
-                start = Some((x, y))
-            }
-            '#' => {
-                map.insert((x, y), Cell::Obstacle);
-            }
-            _ => panic!(),
-        });
-    let start = start.unwrap();
-
-    let visited = path_len(&map, start.clone()).unwrap();
-    let silver: usize = visited.len();
-    let gold: usize = visited
-        .iter()
-        .filter(|&p| {
-            let mut map = map.clone();
-            map.insert(*p, Cell::Obstacle);
-            path_len(&map, start.clone()).is_none()
-        })
-        .count();
-    println!("silver: {silver}");
-    println!("gold: {gold}");
-
-    return Ok(());
-}
-
-fn path_len(
-    map: &HashMap<(isize, isize), Cell>,
-    mut pos: (isize, isize),
-) -> Option<HashSet<(isize, isize)>> {
-    let mut visited = HashMap::new();
-    let mut dir = Direction::U;
-
-    loop {
-        let before = visited.entry(pos).or_insert(0 as u8);
-        if *before & dir.clone() as u8 > 0 {
-            return None;
-        }
-        *before |= dir.clone() as u8;
-
-        let ahead = dir.shift(pos);
-        match map.get(&ahead) {
-            Some(Cell::Empty) => pos = ahead,
-            Some(Cell::Obstacle) => dir = dir.rotate(),
-            None => return Some(visited.into_keys().collect()),
-        };
-    }
-}