1 files changed, 0 insertions, 123 deletions
diff --git a/src/bin/day04.rs b/src/bin/day04.rs
deleted file mode 100644
index 8e724c2..0000000
--- a/src/bin/day04.rs
+++ /dev/null
@@ -1,123 +0,0 @@
-use std::io::{self, Read};
-use std::str::FromStr;
-
-struct Room {
-    name: String,
-    sector_id: u32,
-    checksum: String,
-}
-
-impl FromStr for Room {
-    type Err = ();
-    fn from_str(s: &str) -> Result<Self, ()> {
-        let mut iter = s.trim_right_matches(']')
-            .rsplitn(3, |c| c == '-' || c == '[');
-
-        let checksum = iter.next().ok_or(())?;
-        let sector_id = iter.next().ok_or(())?;
-        let name = iter.next().ok_or(())?;
-
-        Ok(Room {
-            name: name.into(),
-            sector_id: sector_id.parse().map_err(|_| ())?,
-            checksum: checksum.into(),
-        })
-    }
-}
-
-impl Room {
-    fn checksum(&self) -> String {
-        let mut letters = [
-            (0, 'a'), (0, 'b'), (0, 'c'), (0, 'd'), (0, 'e'), (0, 'f'), (0, 'g'), (0, 'h'),
-            (0, 'i'), (0, 'j'), (0, 'k'), (0, 'l'), (0, 'm'), (0, 'n'), (0, 'o'), (0, 'p'),
-            (0, 'q'), (0, 'r'), (0, 's'), (0, 't'), (0, 'u'), (0, 'v'), (0, 'w'), (0, 'x'),
-            (0, 'y'), (0, 'z'),
-        ];
-
-        for letter in self.name.chars().filter(|c| c.is_alphabetic()) {
-            let index = letter as u8 - b'a';
-            letters[index as usize].0 -= 1;
-        }
-
-        letters.sort();
-
-        letters.into_iter()
-            .map(|l| l.1)
-            .take(5)
-            .collect()
-    }
-
-    fn verify_checksum(&self) -> bool {
-        self.checksum == self.checksum()
-    }
-
-    fn decrypt_name(&self) -> String {
-        self.name.chars()
-            .map(|c| {
-                match c {
-                    '-' => ' ',
-                    _ => rotate(c, self.sector_id),
-                }
-            })
-            .collect()
-    }
-}
-
-fn rotate(c: char, n: u32) -> char {
-    let c = c as u8 + (n % 26) as u8;
-    if c > b'z' {
-        (c - 26) as char
-    } else {
-        c as char
-    }
-}
-
-fn solve1(input: &str) -> u32 {
-    input.lines()
-        .map(str::parse)
-        .map(Result::unwrap)
-        .filter(Room::verify_checksum)
-        .map(|room| room.sector_id)
-        .sum()
-}
-
-fn solve2(input: &str) -> Option<u32> {
-    input.lines()
-        .map(str::parse)
-        .map(Result::unwrap)
-        .filter(Room::verify_checksum)
-        .filter_map(|r| {
-            match r.decrypt_name().as_str() {
-                "northpole object storage" => Some(r.sector_id),
-                _ => None,
-            }
-        })
-        .next()
-}
-
-fn main() {
-    let mut input = String::new();
-    io::stdin().read_to_string(&mut input).unwrap();
-
-    println!("Part 1: {}", solve1(&input));
-    if let Some(sector_id) = solve2(&input) {
-        println!("Part 2: {}", sector_id);
-    }
-}
-
-#[test]
-fn part1() {
-    let input = "
-aaaaa-bbb-z-y-x-123[abxyz]
-a-b-c-d-e-f-g-h-987[abcde]
-not-a-real-room-404[oarel]
-totally-real-room-200[decoy]
-";
-    assert_eq!(1514, solve1(&input[1..]));
-}
-
-#[test]
-fn part2() {
-    let room: Room = "qzmt-zixmtkozy-ivhz-343[zimth]".parse().unwrap();
-    assert_eq!("very encrypted name", room.decrypt_name());
-}