1 files changed, 0 insertions, 148 deletions
diff --git a/src/bin/day17.rs b/src/bin/day17.rs
deleted file mode 100644
index c769f32..0000000
--- a/src/bin/day17.rs
+++ /dev/null
@@ -1,148 +0,0 @@
-extern crate crypto;
-
-use std::collections::VecDeque;
-use std::io::{self, Read};
-
-use crypto::digest::Digest;
-use crypto::md5::Md5;
-
-#[derive(Clone, Copy)]
-enum Direction {
-    Up,
-    Down,
-    Left,
-    Right,
-}
-
-const DIRECTIONS: &'static [Direction] = &[
-    Direction::Up,
-    Direction::Down,
-    Direction::Left,
-    Direction::Right,
-];
-
-impl From<Direction> for char {
-    fn from(direction: Direction) -> Self {
-        match direction {
-            Direction::Up => 'U',
-            Direction::Down => 'D',
-            Direction::Left => 'L',
-            Direction::Right => 'R',
-        }
-    }
-}
-
-#[derive(Default, Clone, Copy)]
-struct Room {
-    x: u8,
-    y: u8,
-}
-
-impl Room {
-    fn neighbor(self, direction: Direction) -> Option<Room> {
-        match direction {
-            Direction::Up    if self.y != 0 => Some(Room { x: self.x, y: self.y - 1 }),
-            Direction::Down  if self.y != 3 => Some(Room { x: self.x, y: self.y + 1 }),
-            Direction::Left  if self.x != 0 => Some(Room { x: self.x - 1, y: self.y }),
-            Direction::Right if self.x != 3 => Some(Room { x: self.x + 1, y: self.y }),
-            _ => None,
-        }
-    }
-
-    fn is_vault(self) -> bool {
-        self.x == 3 && self.y == 3
-    }
-}
-
-#[derive(Default, Clone)]
-struct State {
-    room: Room,
-    path: Vec<Direction>,
-}
-
-impl<'a> From<&'a State> for String {
-    fn from(state: &'a State) -> String {
-        state.path.iter().cloned().map(char::from).collect()
-    }
-}
-
-impl State {
-    fn is_vault(&self) -> bool {
-        self.room.is_vault()
-    }
-
-    fn generate_states(&self, states: &mut VecDeque<State>, passcode: &str) {
-        let mut md5 = Md5::new();
-        md5.input_str(passcode);
-        md5.input_str(&String::from(self));
-        let hash = md5.result_str();
-
-        for (direction, ch) in DIRECTIONS.iter().cloned().zip(hash.chars()) {
-            if ch < 'b' || ch > 'f' { continue }
-
-            let room = match self.room.neighbor(direction) {
-                Some(r) => r,
-                None => continue,
-            };
-
-            let mut path = self.path.clone();
-            path.push(direction);
-
-            states.push_back(State { room: room, path: path });
-        }
-    }
-}
-
-fn solve1(passcode: &str) -> String {
-    let mut states = VecDeque::new();
-    states.push_back(State::default());
-
-    while let Some(state) = states.pop_front() {
-        if state.is_vault() {
-            return String::from(&state);
-        }
-        state.generate_states(&mut states, passcode);
-    }
-
-    panic!("no path to vault")
-}
-
-fn solve2(passcode: &str) -> usize {
-    let mut states = VecDeque::new();
-    states.push_back(State::default());
-
-    let mut longest = None;
-
-    while let Some(state) = states.pop_front() {
-        if state.is_vault() {
-            longest = Some(state.clone());
-        } else {
-            state.generate_states(&mut states, passcode);
-        }
-    }
-
-    longest.unwrap().path.len()
-}
-
-fn main() {
-    let mut input = String::new();
-    io::stdin().read_to_string(&mut input).unwrap();
-
-    println!("Part 1: {}", solve1(input.trim()));
-    println!("Part 2: {}", solve2(input.trim()));
-}
-
-#[test]
-fn part1() {
-    assert_eq!("DDRRRD", solve1("ihgpwlah"));
-    assert_eq!("DDUDRLRRUDRD", solve1("kglvqrro"));
-    assert_eq!("DRURDRUDDLLDLUURRDULRLDUUDDDRR", solve1("ulqzkmiv"));
-}
-
-#[test]
-#[ignore]
-fn part2() {
-    assert_eq!(370, solve2("ihgpwlah"));
-    assert_eq!(492, solve2("kglvqrro"));
-    assert_eq!(830, solve2("ulqzkmiv"));
-}