data/examples/08-1.txt

@@ -1,5 +0,0 @@
-LLR
-
-AAA = (BBB, BBB)
-BBB = (AAA, ZZZ)
-ZZZ = (ZZZ, ZZZ)

data/examples/08-2.txt

@@ -1,10 +0,0 @@
-LR
-
-11A = (11B, XXX)
-11B = (XXX, 11Z)
-11Z = (11B, XXX)
-22A = (22B, XXX)
-22B = (22C, 22C)
-22C = (22Z, 22Z)
-22Z = (22B, 22B)
-XXX = (XXX, XXX)

src/bin/08.rs

@@ -1,95 +0,0 @@
-use std::collections::HashMap;
-
-use aoc::lcm;
-
-pub fn part_one(input: &str) -> Option<u32> {
-    let mut map = HashMap::new();
-
-    let (directions, map_data) = input.split_once("\n\n")?;
-    for line in map_data.lines() {
-        let (k, v) = line.split_once(" = ")?;
-        let v = v.strip_prefix('(')?;
-        let v = v.strip_suffix(')')?;
-        let (l, r) = v.split_once(", ")?;
-
-        *map.entry(k).or_default() = (l, r);
-    }
-
-    let mut counter = 0;
-    let mut loc = "AAA";
-
-    for d in directions.chars().cycle() {
-        if loc == "ZZZ" {
-            break;
-        }
-
-        counter += 1;
-        let (l, r) = map[loc];
-
-        match d {
-            'L' => loc = l,
-            'R' => loc = r,
-            _ => unimplemented!(),
-        }
-    }
-
-    Some(counter)
-}
-
-pub fn part_two(input: &str) -> Option<u64> {
-    let mut map = HashMap::new();
-
-    let (directions, map_data) = input.split_once("\n\n")?;
-    for line in map_data.lines() {
-        let (k, v) = line.split_once(" = ")?;
-        let v = v.strip_prefix('(')?;
-        let v = v.strip_suffix(')')?;
-        let (l, r) = v.split_once(", ")?;
-
-        *map.entry(k).or_default() = (l, r);
-    }
-
-    let mut res = 1;
-
-    for k in map.keys().filter(|x| x.ends_with('A')) {
-        let mut location = *k;
-
-        for (i, d) in directions.chars().cycle().enumerate() {
-            let (l, r) = map[location];
-
-            location = match d {
-                'L' => l,
-                'R' => r,
-                _ => unimplemented!(),
-            };
-
-            if location.ends_with('Z') {
-                res = lcm(res, i + 1);
-                break;
-            }
-        }
-    }
-
-    Some(res as u64)
-}
-
-aoc::solution!(8);
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    #[test]
-    fn test_part_one() {
-        assert_eq!(
-            part_one(&aoc::template::read_file_part("examples", 8, 1)),
-            Some(6)
-        );
-    }
-    #[test]
-    fn test_part_two() {
-        assert_eq!(
-            part_two(&aoc::template::read_file_part("examples", 8, 2)),
-            Some(6)
-        );
-    }
-}

src/lib.rs

@@ -1,28 +1,4 @@
 #![feature(pattern)]
 
-use std::mem::swap;
-
 pub mod parsers;
 pub mod template;
-
-pub fn lcm(first: usize, second: usize) -> usize {
-    first * second / gcd(first, second)
-}
-
-pub fn gcd(first: usize, second: usize) -> usize {
-    let mut max = first;
-    let mut min = second;
-    if min > max {
-        swap(&mut min, &mut max)
-    }
-
-    loop {
-        let res = max % min;
-        if res == 0 {
-            return min;
-        }
-
-        max = min;
-        min = res;
-    }
-}

src/template.rs

@@ -54,14 +54,3 @@ pub fn read_file(folder: &str, day: u8) -> String {
     let f = fs::read_to_string(filepath);
     f.expect("could not open input file").trim().to_string()
 }
-
-#[must_use]
-pub fn read_file_part(folder: &str, day: u8, part: u8) -> String {
-    let cwd = env::current_dir().unwrap();
-    let filepath = cwd
-        .join("data")
-        .join(folder)
-        .join(format!("{day:02}-{part}.txt"));
-    let f = fs::read_to_string(filepath);
-    f.expect("could not open input file").trim().to_string()
-}