day 12 part 2 look for corners by two blueprints

Cargo.toml

@@ -1,12 +1,8 @@
 [package]
 name = "advent-of-rust-2024"
 version = "0.1.0"
-edition = "2024"
+edition = "2021"
 
 [dependencies]
 itertools = "0.13.0"
 regex = "1.11.1"
-
-[profile.dev]
-opt-level = 3
-

day18.py

@@ -1,67 +0,0 @@
-def parse_input(input: list[str]):
-    return [tuple(map(lambda f: int(f), cl.split(','))) for cl in input]
-
-
-with open('input/day18.txt', 'r') as f:
-    data = f.read()
-
-
-points = parse_input(data.strip().split('\n'))
-
-# points = set([
-#     (5, 4),
-#     (4, 2),
-#     (4, 5),
-#     (3, 0),
-#     (2, 1),
-#     (6, 3),
-#     (2, 4),
-#     (1, 5),
-#     (0, 6),
-#     (3, 3),
-#     (2, 6),
-#     (5, 1),
-#     (1, 2),
-#     (5, 5),
-#     (2, 5),
-#     (6, 5),
-#     (1, 4),
-#     (0, 4),
-#     (6, 4),
-#     (1, 1),
-#     (6, 1),
-#     (1, 0),
-#     (0, 5),
-#     (1, 6),
-#     (2, 0),
-# ][:12])
-# goal = (6, 6)
-# w = 6
-
-
-def sp(points, w):
-    visited = dict()
-    stack = [(0, 0, 0)]
-    while len(stack) > 0:
-        (x, y, c) = stack.pop(0)
-        if (x, y) == (w, w):
-            return c
-
-        if (x, y) in visited:
-            continue
-        visited[(x, y)] = c
-
-        for (a, b) in [(x+nx, y+ny) for (nx, ny) in [(0, 1), (1, 0), (0, -1), (-1, 0)]]:
-            if 0 <= a <= w and 0 <= b <= w and (a, b) not in points:
-                stack.append((a, b, c + 1))
-
-    return None
-
-
-print("task 1: " + str(sp(set(points[:1024]), 70)))
-
-for take in range(1024, len(points)):
-    solution = sp(set(points[:take]), 70)
-    if not solution:
-        print("task 2: " + str(points[take - 1]))
-        break

day20.py

@@ -1,57 +0,0 @@
-def parse_input(input: list[str]):
-    l = [(x, y) for (y, line) in enumerate(input) for (x, c) in enumerate(line) if c == '#']
-    start = [(x, y) for (y, line) in enumerate(input) for (x, c) in enumerate(line) if c == 'S'][0]
-    goal = [(x, y) for (y, line) in enumerate(input) for (x, c) in enumerate(line) if c == 'E'][0]
-    w = max([x for (x, y) in l])
-    h = max([y for (x, y) in l])
-    return l, w, h, start, goal
-
-
-def sssp(points, w, h, start):
-    visited = dict()
-    (sx, sy) = start
-    stack = [(sx, sy, 0)]
-    while len(stack) > 0:
-        (x, y, c) = stack.pop(0)
-
-        if (x, y) in visited:
-            continue
-        visited[(x, y)] = c
-
-        for (a, b) in [(x+nx, y+ny) for (nx, ny) in [(0, 1), (1, 0), (0, -1), (-1, 0)]]:
-            if 0 <= a <= w and 0 <= b <= w and (a, b) not in points:
-                stack.append((a, b, c + 1))
-
-    return visited
-
-
-def mhd(a, b):
-    (xa, ya) = a
-    (xb, yb) = b
-    return abs(xa - xb) + abs(ya - yb)
-
-
-def others(origin, max_distance):
-    (sx, sy) = origin
-    return [(a, b) for a in range(sx - max_distance, sx + max_distance + 1) for b in range(sy - max_distance, sy + max_distance + 1)]
-
-
-def solve(points, threshold, cheat_length):
-    fromstart = sssp(set(points), w, h, start)
-    toend = sssp(set(points), w, h, goal)
-    cheatrange = range(2, cheat_length + 1)
-    return len([1 for a in fromstart for b in others(a, cheat_length) if mhd(a, b) in cheatrange and b in toend and fromstart[a] + mhd(a, b) + toend[b] <= threshold])
-
-
-source = "input/day20.txt"
-with open(source, 'r') as f:
-    data = f.read()
-
-(points, w, h, start, goal) = parse_input(data.strip().split('\n'))
-bottomline = sssp(set(points), w, h, start)[goal]
-
-solution1 = solve(set(points), bottomline - 100, 2)
-print("part 1: " + str(solution1))
-
-solution2 = solve(set(points), bottomline - 100, 20)
-print("part 2: " + str(solution2))

src/day06.rs

@@ -64,7 +64,7 @@ fn parse(input: &str) -> (Grid<char>, Coord) {
 }
 
 fn is_loop(m: &Grid<char>, block: Coord, mut pos: Coord, mut dir: char) -> bool {
-    let mut visited: Grid<[bool; 5]> = Grid::from_default(m.content_width, m.content_height);
+    let mut visited = HashSet::new();
     loop {
         let (x, y) = pos;
 
@@ -79,11 +79,10 @@ fn is_loop(m: &Grid<char>, block: Coord, mut pos: Coord, mut dir: char) -> bool
             return false;
         } else if next == block || '#' == m[next] {
             // we only check for loops on a collision to speed things up
-            // this is our own little hash function to speed things up
+            if visited.contains(&(pos, dir)) {
-            if visited[pos][dir as usize % 5] {
                 return true;
             }
-            visited[pos][dir as usize % 5] = true;
+            visited.insert((pos, dir));
 
             dir = match dir {
                 '^' => '>',

src/day09.rs

@@ -1,4 +1,4 @@
-use std::{collections::BTreeMap, fs::read_to_string};
+use std::fs::read_to_string;
 
 pub fn day_main() {
     let input = read_to_string("input/day09.txt").unwrap();
@@ -53,41 +53,48 @@ fn part1(input: &str) -> RiddleResult {
 }
 
 fn part2(input: &str) -> RiddleResult {
-    let mut free: BTreeMap<usize, usize> = BTreeMap::new();
+    let mut disk = Vec::with_capacity(input.len() * 10);
     // (start_index, len, file_id)
-    let mut files: Vec<(usize, usize, usize)> = Vec::with_capacity(input.len() / 2 + 1);
+    let mut files: Vec<(usize, u32, usize)> = Vec::with_capacity(input.len() / 2 + 1);
-    let mut head = 0;
     for (i, l) in input.chars().enumerate() {
-        let l = l.to_digit(10).unwrap() as usize;
+        let l = l.to_digit(10).unwrap();
-        if i % 2 == 0 {
+        let content = if i % 2 == 0 {
-            files.push((head, l, i / 2));
+            // file
+            Some(i / 2) // id based on order of apperance and every second one is a file
         } else {
-            free.insert(head, l);
+            None
+        };
+        if i % 2 == 0 {
+            files.push((disk.len(), l, i / 2));
+        }
+        for _ in 0..l {
+            disk.push(content);
         }
-        head += l;
     }
-    for file in files.iter_mut().rev() {
+    while let Some((start_index, length, file_id)) = files.pop() {
-        let (start_index, length, _file_id) = *file;
+        let mut seeker = 0;
-        let found = free
+        let mut found = None;
-            .iter()
+        while disk[seeker] != Some(file_id) {
-            .take_while(|f| *f.0 < start_index)
+            if disk[seeker..seeker + length as usize]
-            .find(|f| *f.1 >= length);
+                .iter()
-
+                .all(|v| v.is_none())
-        if let Some((&free_start, &free_length)) = found {
+            {
-            free.remove(&free_start);
+                found = Some(seeker);
-            free.insert(start_index, length);
+                break;
-            file.0 = free_start;
+            }
-            if length < free_length {
+            seeker += 1;
-                free.insert(free_start + length, free_length - length);
+        }
+        if let Some(empty_start) = found {
+            for i in 0..length as usize {
+                disk[empty_start + i] = Some(file_id);
+                disk[start_index + i] = None;
             }
         }
     }
 
-    files
+    disk.into_iter()
-        .iter()
+        .enumerate()
-        .map(|(start_index, l, file_id)| {
+        .map(|(i, v)| if let Some(value) = v { i * value } else { 0 })
-            *file_id * (*start_index..start_index + l).sum::<RiddleResult>()
-        })
         .sum()
 }
 

src/day12.rs

@@ -56,12 +56,12 @@ fn part2(input: &str) -> RiddleResult {
         }
         let mut area = 0;
         let mut further = vec![p];
-        let mut group = HashSet::new();
+        let mut convex_corners = 0;
+        let mut concave_corners = 0;
         while let Some(current) = further.pop() {
             if processed.contains(&current) {
                 continue;
             }
-            group.insert(current);
             area += 1;
             for next in NEIGHBORS.iter().map(|d| (current.0 + d.0, current.1 + d.1)) {
                 let next_c = garden.get(next);
@@ -71,88 +71,28 @@ fn part2(input: &str) -> RiddleResult {
                 }
             }
             processed.insert(current);
+            for (da, db) in NEIGHBORS.iter().circular_tuple_windows() {
+                let a = (current.0 + da.0, current.1 + da.1);
+                let b = (current.0 + db.0, current.1 + db.1);
+                if garden.get(a) != Some(c) && garden.get(b) != Some(c) {
+                    convex_corners += 1;
+                } else if garden.get(a) == Some(c)
+                    && garden.get(b) == Some(c)
+                    && garden.get((current.0 + da.0 + db.0, current.1 + da.1 + db.1)) != Some(c)
+                {
+                    concave_corners += 1;
+                }
+            }
         }
-        result += area * sides(group);
+        let var_name = convex_corners + concave_corners;
+        let var_name = area * (var_name);
+        result += var_name;
     }
     result
 }
 
-fn sides(group: HashSet<(i64, i64)>) -> RiddleResult {
-    let x_range = group.iter().min_by_key(|it| it.0).unwrap().0
-        ..=group.iter().max_by_key(|it| it.0).unwrap().0;
-    let y_range = group.iter().min_by_key(|it| it.1).unwrap().1
-        ..=group.iter().max_by_key(|it| it.1).unwrap().1;
-    let mut result = 0;
-    for x in x_range {
-        // 1 for the ending of the last group, +1 for each time a line "stops", e.g. between the current point and next there is a gap
-        let points = group
-            .iter()
-            .filter(|p| p.0 == x)
-            .filter(|p| !group.contains(&(p.0 - 1, p.1)))
-            .sorted_by_key(|p| p.1)
-            .collect_vec();
-        if !points.is_empty() {
-            let count = points
-                .into_iter()
-                .tuple_windows()
-                .filter(|(a, b)| a.1 + 1 != b.1)
-                .count();
-            result += 1 + count;
-        }
-        let points = group
-            .iter()
-            .filter(|p| p.0 == x)
-            .filter(|p| !group.contains(&(p.0 + 1, p.1)))
-            .sorted_by_key(|p| p.1)
-            .collect_vec();
-        if !points.is_empty() {
-            let count = points
-                .into_iter()
-                .tuple_windows()
-                .filter(|(a, b)| a.1 + 1 != b.1)
-                .count();
-            result += 1 + count;
-        }
-    }
-    for y in y_range {
-        let points = group
-            .iter()
-            .filter(|p| p.1 == y)
-            .filter(|p| !group.contains(&(p.0, p.1 - 1)))
-            .sorted_by_key(|p| p.0)
-            .collect_vec();
-        if !points.is_empty() {
-            let count = points
-                .into_iter()
-                .tuple_windows()
-                .filter(|(a, b)| a.0 + 1 != b.0)
-                .count();
-            result += 1 + count;
-        }
-        let points = group
-            .iter()
-            .filter(|p| p.1 == y)
-            .filter(|p| !group.contains(&(p.0, p.1 + 1)))
-            .sorted_by_key(|p| p.0)
-            .collect_vec();
-        if !points.is_empty() {
-            let count = points
-                .into_iter()
-                .tuple_windows()
-                .filter(|(a, b)| a.0 + 1 != b.0)
-                .count();
-            result += 1 + count;
-        }
-    }
-    result as RiddleResult
-}
-
 #[cfg(test)]
 mod test {
-    use std::collections::HashSet;
-
-    use crate::day12::sides;
-
     use super::{part1, part2};
 
     const TEST_INPUT: &str = r"AAAA
@@ -170,16 +110,4 @@ EEEC
     fn test2() {
         assert_eq!(part2(TEST_INPUT), 80);
     }
-
-    #[test]
-    fn sides_one() {
-        let group = HashSet::from_iter([(3, 5)]);
-        assert_eq!(sides(group), 4);
-    }
-
-    #[test]
-    fn sides_plus() {
-        let group = HashSet::from_iter([(3, 3), (3, 4), (3, 2), (2, 3), (4, 3)]);
-        assert_eq!(sides(group), 12);
-    }
 }

src/day13.rs

@@ -1,99 +0,0 @@
-use std::fs::read_to_string;
-
-use itertools::Itertools;
-use regex::Regex;
-
-pub fn day_main() {
-    let input = read_to_string("input/day13.txt").unwrap();
-    let input = input.trim();
-    println!(" part1: {}", part1(input));
-    println!(" part2: {}", part2(input));
-}
-
-type RiddleResult = i64;
-
-fn part1(input: &str) -> RiddleResult {
-    // Button A: X+30, Y+84
-    // Button B: X+74, Y+60
-    // Prize: X=2358, Y=2628
-    let r = Regex::new(
-        r"Button A: X\+(\d+), Y\+(\d+)
-Button B: X\+(\d+), Y\+(\d+)
-Prize: X=(\d+), Y=(\d+)",
-    )
-    .unwrap();
-    r.captures_iter(input)
-        .map(|block| {
-            let (ax, ay, bx, by, px, py) = block
-                .iter()
-                .skip(1)
-                .map(|it| it.unwrap().as_str().parse::<i64>().unwrap())
-                .collect_tuple()
-                .unwrap();
-            solve((ax, ay, bx, by, px, py)).unwrap_or(0)
-        })
-        .sum()
-}
-
-fn part2(input: &str) -> RiddleResult {
-    let r = Regex::new(
-        r"Button A: X\+(\d+), Y\+(\d+)
-Button B: X\+(\d+), Y\+(\d+)
-Prize: X=(\d+), Y=(\d+)",
-    )
-    .unwrap();
-    r.captures_iter(input)
-        .map(|block| {
-            let (ax, ay, bx, by, px, py) = block
-                .iter()
-                .skip(1)
-                .map(|it| it.unwrap().as_str().parse::<i64>().unwrap())
-                .collect_tuple()
-                .unwrap();
-            let solution = solve((ax, ay, bx, by, px + 10000000000000, py + 10000000000000));
-            solution.unwrap_or(0)
-        })
-        .sum()
-}
-
-fn solve((ax, ay, bx, by, px, py): (i64, i64, i64, i64, i64, i64)) -> Option<RiddleResult> {
-    let b = (ay * px - ax * py) / (ay * bx - ax * by);
-    let a = (px - b * bx) / ax;
-    if a >= 0 && b >= 0 && a * ax + b * bx == px && a * ay + b * by == py {
-        Some(3 * a + b)
-    } else {
-        None
-    }
-}
-
-#[cfg(test)]
-mod test {
-    use super::{part1, part2};
-
-    const TEST_INPUT: &str = r"Button A: X+94, Y+34
-Button B: X+22, Y+67
-Prize: X=8400, Y=5400
-
-Button A: X+26, Y+66
-Button B: X+67, Y+21
-Prize: X=12748, Y=12176
-
-Button A: X+17, Y+86
-Button B: X+84, Y+37
-Prize: X=7870, Y=6450
-
-Button A: X+69, Y+23
-Button B: X+27, Y+71
-Prize: X=18641, Y=10279
-";
-
-    #[test]
-    fn test1() {
-        assert_eq!(part1(TEST_INPUT), 480);
-    }
-
-    #[test]
-    fn test2() {
-        assert_eq!(part2(TEST_INPUT), 875318608908);
-    }
-}

src/day14.rs

@@ -1,153 +0,0 @@
-use std::fs::read_to_string;
-
-use itertools::Itertools;
-
-use crate::utils::grid::Grid;
-
-pub fn day_main() {
-    let input = read_to_string("input/day14.txt").unwrap();
-    let input = input.trim();
-    println!(" part1: {}", part1(input));
-    println!(" part2: {}", part2(input));
-}
-
-type RiddleResult = usize;
-
-fn part1(input: &str) -> RiddleResult {
-    solve_part1(input, 100, 101, 103)
-}
-
-fn solve_part1(input: &str, rounds: i64, width: i64, height: i64) -> RiddleResult {
-    let mut robots = parse(input);
-    for _ in 0..rounds {
-        robots.iter_mut().for_each(|((px, py), (vx, vy))| {
-            *px = (*px + width + *vx) % width;
-            *py = (*py + height + *vy) % height;
-        });
-    }
-    let upper_left = robots
-        .iter()
-        .filter(|&&((px, py), _)| px < width / 2 && py < height / 2)
-        .count();
-    let lower_left = robots
-        .iter()
-        .filter(|&&((px, py), _)| px < width / 2 && py > height / 2)
-        .count();
-    let upper_right = robots
-        .iter()
-        .filter(|&&((px, py), _)| px > width / 2 && py < height / 2)
-        .count();
-    let lower_right = robots
-        .iter()
-        .filter(|&&((px, py), _)| px > width / 2 && py > height / 2)
-        .count();
-
-    upper_left * lower_left * upper_right * lower_right
-}
-
-fn parse(input: &str) -> Vec<((i64, i64), (i64, i64))> {
-    input
-        .lines()
-        .map(|line| {
-            line.strip_prefix("p=")
-                .unwrap()
-                .split(" v=")
-                .map(|s| {
-                    s.split(",")
-                        .map(|d| d.parse::<i64>().unwrap())
-                        .collect_tuple::<(i64, i64)>()
-                        .unwrap()
-                })
-                .collect_tuple()
-                .unwrap()
-        })
-        .collect_vec()
-}
-
-#[allow(unused)]
-fn part2(input: &str) -> i64 {
-    let width = 101;
-    let height = 103;
-    let mut robots = parse(input);
-    let max_seconds = width * height;
-    for second in 0.. {
-        if second > max_seconds {
-            panic!("Seen all combinations but no christmas tree. So sad!");
-        }
-        let mut grid: Grid<u8> = Grid::from_default(101, 103);
-        robots.iter_mut().for_each(|((px, py), (vx, vy))| {
-            *px = (*px + width + *vx) % width;
-            *py = (*py + height + *vy) % height;
-            grid[(*px, *py)] += 1;
-            if let Some(v) = grid.get_mut((*px + 1, *py)) {
-                *v += 1
-            }
-            if let Some(v) = grid.get_mut((*px - 1, *py)) {
-                *v += 1
-            }
-            if let Some(v) = grid.get_mut((*px, *py + 1)) {
-                *v += 1
-            }
-            if let Some(v) = grid.get_mut((*px, *py - 1)) {
-                *v += 1
-            }
-        });
-
-        if robots.iter().filter(|(s, _)| grid[*s] > 1).count() > robots.len() * 70 / 100 {
-            // printr(&robots, width, height);
-            // println!("after {} seconds. Press enter to continue or type 'merry christmas' if you can spot a tree!", second + 1); //+1 because we look at it after they have changed
-            return second + 1;
-            // let stdin = io::stdin();
-            // let line = stdin.lock().lines().next().unwrap().unwrap();
-            // if line.as_str().eq_ignore_ascii_case("merry christmas") {
-            // return second + 1;
-            // }
-        }
-    }
-    unreachable!()
-}
-
-#[allow(unused)]
-type Robot = ((i64, i64), (i64, i64));
-
-#[allow(unused)]
-fn printr(robots: &[Robot], width: i64, height: i64) {
-    for y in 0..height {
-        for x in 0..width {
-            let c = robots
-                .iter()
-                .filter(|&&((px, py), _)| px == x && py == y)
-                .count();
-            if c == 0 {
-                print!(".");
-            } else {
-                print!("{c}");
-            }
-        }
-        println!();
-    }
-}
-
-#[cfg(test)]
-mod test {
-    use crate::day14::solve_part1;
-
-    const TEST_INPUT: &str = r"p=0,4 v=3,-3
-p=6,3 v=-1,-3
-p=10,3 v=-1,2
-p=2,0 v=2,-1
-p=0,0 v=1,3
-p=3,0 v=-2,-2
-p=7,6 v=-1,-3
-p=3,0 v=-1,-2
-p=9,3 v=2,3
-p=7,3 v=-1,2
-p=2,4 v=2,-3
-p=9,5 v=-3,-3
-";
-
-    #[test]
-    fn test1() {
-        assert_eq!(solve_part1(TEST_INPUT, 100, 11, 7), 12);
-    }
-}

src/day15.rs

@@ -1,203 +0,0 @@
-use std::{collections::HashSet, fs::read_to_string};
-
-use itertools::Itertools;
-
-use crate::utils::grid::{Coord, Grid};
-
-pub fn day_main() {
-    let input = read_to_string("input/day15.txt").unwrap();
-    let input = input.trim();
-    println!(" part1: {}", part1(input));
-    println!(" part2: {}", part2(input));
-}
-
-type RiddleResult = i64;
-
-fn part1(input: &str) -> RiddleResult {
-    let (grid, movements) = input.split_once("\n\n").unwrap();
-    let mut grid = Grid::parse(grid);
-    let mut robot = grid.entries().find(|(_r, c)| **c == '@').unwrap().0;
-    let directions = |d| match d {
-        '^' => (0, -1),
-        'v' => (0, 1),
-        '<' => (-1, 0),
-        '>' => (1, 0),
-        _ => panic!(),
-    };
-    for m in movements.chars().filter(|c| *c != '\n') {
-        let dir = directions(m);
-        let space = (1..)
-            .map(|i| (robot.0 + i * dir.0, robot.1 + i * dir.1))
-            .take_while(|p| grid.get(*p).is_some() && (grid[*p] == '.' || grid[*p] == 'O'))
-            .find(|p| grid[*p] == '.');
-        if let Some(p) = space {
-            if (p.0 - robot.0).abs() + (p.1 - robot.1).abs() > 1 {
-                // this means: the free spot is not a direct neighbor of the robot, i.e. there are boxes
-                grid[p] = 'O';
-            }
-            grid[robot] = '.';
-            robot = (robot.0 + dir.0, robot.1 + dir.1);
-            grid[robot] = '@';
-        }
-    }
-    grid.entries()
-        .filter(|(_, c)| **c == 'O')
-        .map(|((x, y), _)| y * 100 + x)
-        .sum()
-}
-
-fn part2(input: &str) -> RiddleResult {
-    let (grid, movements) = input.split_once("\n\n").unwrap();
-    let grid = grid
-        .lines()
-        .map(|line| {
-            {
-                line.chars().flat_map(|c| {
-                    match c {
-                        '.' => "..",
-                        '@' => "@.",
-                        '#' => "##",
-                        'O' => "[]",
-                        _ => panic!(),
-                    }
-                    .chars()
-                })
-            }
-            .join("")
-        })
-        .join("\n");
-
-    let mut grid = Grid::parse(grid.as_str());
-
-    let mut robot = grid.entries().find(|(_r, c)| **c == '@').unwrap().0;
-    let directions = |d| match d {
-        '^' => (0, -1),
-        'v' => (0, 1),
-        '<' => (-1, 0),
-        '>' => (1, 0),
-        _ => panic!(),
-    };
-    for m in movements.chars().filter(|c| *c != '\n') {
-        let dir = directions(m);
-        if let Some(tiles_to_move) = movable(robot, dir, &grid, false) {
-            let old = tiles_to_move
-                .iter()
-                .map(|tile| (*tile, grid[*tile]))
-                .collect_vec();
-            tiles_to_move.iter().for_each(|tile| grid[*tile] = '.');
-            old.into_iter()
-                .for_each(|(tile, c)| grid[(tile.0 + dir.0, tile.1 + dir.1)] = c);
-            robot = (robot.0 + dir.0, robot.1 + dir.1);
-        }
-    }
-    grid.entries()
-        .filter(|(_, c)| **c == '[')
-        .map(|((x, y), _)| y * 100 + x)
-        .sum()
-}
-
-fn movable(
-    from: (i64, i64),
-    dir: (i64, i64),
-    grid: &Grid<char>,
-    ignore_other_half: bool,
-) -> Option<HashSet<Coord>> {
-    match grid[from] {
-        '.' => Some(HashSet::new()),
-        '@' => {
-            let next = movable((from.0 + dir.0, from.1 + dir.1), dir, grid, false);
-            next.map(|mut v| {
-                v.insert(from);
-                v
-            })
-        }
-        '[' => {
-            if dir.0 != 0 {
-                // sideway movement is "regular"
-                let next = movable((from.0 + dir.0, from.1 + dir.1), dir, grid, false);
-                next.map(|mut v| {
-                    v.insert(from);
-                    v
-                })
-            } else {
-                // up/down always means the other part of the crate has to move in parallel
-                let mut next1 = movable((from.0 + dir.0, from.1 + dir.1), dir, grid, false)?;
-                if !ignore_other_half {
-                    let next2 = movable((from.0 + 1, from.1), dir, grid, true)?;
-                    next1.extend(next2);
-                }
-                next1.insert(from);
-                Some(next1)
-            }
-        }
-        ']' => {
-            if dir.0 != 0 {
-                // sideway movement is "regular"
-                let next = movable((from.0 + dir.0, from.1 + dir.1), dir, grid, false);
-                next.map(|mut v| {
-                    v.insert(from);
-                    v
-                })
-            } else {
-                // up/down always means the other part of the crate has to move in parallel
-                let mut next1 = movable((from.0 + dir.0, from.1 + dir.1), dir, grid, false)?;
-                if !ignore_other_half {
-                    let next2 = movable((from.0 - 1, from.1), dir, grid, true)?;
-                    next1.extend(next2);
-                }
-                next1.insert(from);
-                Some(next1)
-            }
-        }
-        _ => None,
-    }
-}
-
-#[cfg(test)]
-mod test {
-    use super::{part1, part2};
-
-    const TEST_INPUT: &str = r"########
-#..O.O.#
-##@.O..#
-#...O..#
-#.#.O..#
-#...O..#
-#......#
-########
-
-<^^>>>vv<v>>v<<";
-
-    const TEST_LARGE: &str = r"##########
-#..O..O.O#
-#......O.#
-#.OO..O.O#
-#..O@..O.#
-#O#..O...#
-#O..O..O.#
-#.OO.O.OO#
-#....O...#
-##########
-
-<vv>^<v^>v>^vv^v>v<>v^v<v<^vv<<<^><<><>>v<vvv<>^v^>^<<<><<v<<<v^vv^v>^
-vvv<<^>^v^^><<>>><>^<<><^vv^^<>vvv<>><^^v>^>vv<>v<<<<v<^v>^<^^>>>^<v<v
-><>vv>v^v^<>><>>>><^^>vv>v<^^^>>v^v^<^^>v^^>v^<^v>v<>>v^v^<v>v^^<^^vv<
-<<v<^>>^^^^>>>v^<>vvv^><v<<<>^^^vv^<vvv>^>v<^^^^v<>^>vvvv><>>v^<<^^^^^
-^><^><>>><>^^<<^^v>>><^<v>^<vv>>v>>>^v><>^v><<<<v>>v<v<v>vvv>^<><<>^><
-^>><>^v<><^vvv<^^<><v<<<<<><^v<<<><<<^^<v<^^^><^>>^<v^><<<^>>^v<v^v<v^
->^>>^v>vv>^<<^v<>><<><<v<<v><>v<^vv<<<>^^v^>^^>>><<^v>>v^v><^^>>^<>vv^
-<><^^>^^^<><vvvvv^v<v<<>^v<v>v<<^><<><<><<<^^<<<^<<>><<><^^^>^^<>^>v<>
-^^>vv<^v^v<vv>^<><v<^v>^^^>>>^^vvv^>vvv<>>>^<^>>>>>^<<^v>^vvv<>^<><<v>
-v^^>>><<^^<>>^v^<v^vv<>v^<<>^<^v^v><^<<<><<^<v><v<>vv>>v><v^<vv<>v^<<^
-";
-
-    #[test]
-    fn test1() {
-        assert_eq!(part1(TEST_INPUT), 2028);
-    }
-
-    #[test]
-    fn test2() {
-        assert_eq!(part2(TEST_LARGE), 9021);
-    }
-}

src/day16.rs

@@ -1,190 +0,0 @@
-use std::{
-    collections::{BinaryHeap, HashMap, HashSet},
-    fs::read_to_string,
-};
-
-use itertools::Itertools;
-
-use crate::utils::grid::{Coord, Grid};
-
-pub fn day_main() {
-    let input = read_to_string("input/day16.txt").unwrap();
-    let input = input.trim();
-    println!(" part1: {}", part1(input));
-    println!(" part2: {}", part2(input));
-}
-
-type RiddleResult = usize;
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-enum Dir {
-    N,
-    E,
-    S,
-    W,
-}
-
-impl Dir {
-    fn nexts(&self) -> [Self; 2] {
-        match self {
-            Dir::N | Dir::S => [Dir::W, Dir::E],
-            Dir::E | Dir::W => [Dir::S, Dir::N],
-        }
-    }
-}
-
-struct Step(Coord, Dir, usize, Option<Node>);
-
-impl Ord for Step {
-    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
-        other.2.cmp(&self.2)
-    }
-}
-impl PartialOrd for Step {
-    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        Some(self.cmp(other))
-    }
-}
-impl PartialEq for Step {
-    fn eq(&self, other: &Self) -> bool {
-        other.2.eq(&self.2)
-    }
-}
-impl Eq for Step {}
-
-fn part1(input: &str) -> RiddleResult {
-    use Dir::*;
-    let maze = Grid::parse(input);
-    let start = maze.entries().find(|(_p, c)| **c == 'S').unwrap().0;
-    let end = maze.entries().find(|(_p, c)| **c == 'E').unwrap().0;
-    let mut visited = HashMap::<(Coord, Dir), usize>::new();
-    let mut stack: BinaryHeap<Step> = BinaryHeap::new();
-    stack.push(Step(start, E, 0, None));
-    while let Some(Step(np, nd, cost, _)) = stack.pop() {
-        if visited.contains_key(&(np, nd)) {
-            continue;
-        }
-        visited.insert((np, nd), cost);
-        if np == end {
-            return cost;
-        }
-        for d in nd.nexts() {
-            if !visited.contains_key(&(np, d)) {
-                stack.push(Step(np, d, cost + 1000, None));
-            }
-        }
-        let forward = match nd {
-            N => (np.0, np.1 - 1),
-            E => (np.0 + 1, np.1),
-            S => (np.0, np.1 + 1),
-            W => (np.0 - 1, np.1),
-        };
-        if maze[forward] != '#' && !visited.contains_key(&(forward, nd)) {
-            stack.push(Step(forward, nd, cost + 1, None));
-        }
-    }
-    panic!("no path found")
-}
-
-type Node = (Coord, Dir);
-
-fn part2(input: &str) -> RiddleResult {
-    use Dir::*;
-    let maze = Grid::parse(input);
-    let start = maze.entries().find(|(_p, c)| **c == 'S').unwrap().0;
-    let end = maze.entries().find(|(_p, c)| **c == 'E').unwrap().0;
-    let mut visited = HashMap::<Node, (usize, Vec<Node>)>::new();
-    let mut stack: BinaryHeap<Step> = BinaryHeap::new();
-    stack.push(Step(start, E, 0, None));
-
-    let mut best: Option<usize> = None;
-    while let Some(Step(np, nd, cost, pred)) = stack.pop() {
-        if let Some(b) = best {
-            if b < cost {
-                break; // can't reach the end point with best cost anymore
-            }
-        }
-        let entry = visited.entry((np, nd)).or_insert_with(|| {
-            (
-                cost,
-                if let Some(pred) = pred {
-                    vec![pred]
-                } else {
-                    vec![]
-                },
-            )
-        });
-        if entry.0 < cost {
-            continue;
-        }
-        if let Some(pred) = pred {
-            entry.1.push(pred);
-        }
-        if np == end {
-            best = Some(cost);
-        }
-        for d in nd.nexts() {
-            if !visited.contains_key(&(np, d)) {
-                stack.push(Step(np, d, cost + 1000, Some((np, nd))));
-            }
-        }
-        let forward = match nd {
-            N => (np.0, np.1 - 1),
-            E => (np.0 + 1, np.1),
-            S => (np.0, np.1 + 1),
-            W => (np.0 - 1, np.1),
-        };
-        if maze[forward] != '#' && !visited.contains_key(&(forward, nd)) {
-            stack.push(Step(forward, nd, cost + 1, Some((np, nd))));
-        }
-    }
-    let mut accounted = HashSet::<Node>::new();
-    let mut stack: Vec<Node> = visited
-        .iter()
-        .filter(|((pos, _dir), _)| *pos == end)
-        .map(|(node, _)| *node)
-        .to_owned()
-        .collect_vec();
-    while let Some(node) = stack.pop() {
-        if accounted.contains(&node) {
-            continue;
-        }
-        accounted.insert(node);
-        for pred in visited[&node].1.iter() {
-            stack.push(*pred);
-        }
-    }
-    accounted.into_iter().map(|(pos, _)| pos).unique().count()
-}
-
-#[cfg(test)]
-mod test {
-    use super::{part1, part2};
-
-    const TEST_INPUT: &str = r"###############
-#.......#....E#
-#.#.###.#.###.#
-#.....#.#...#.#
-#.###.#####.#.#
-#.#.#.......#.#
-#.#.#####.###.#
-#...........#.#
-###.#.#####.#.#
-#...#.....#.#.#
-#.#.#.###.#.#.#
-#.....#...#.#.#
-#.###.#.#.#.#.#
-#S..#.....#...#
-###############
-";
-
-    #[test]
-    fn test1() {
-        assert_eq!(part1(TEST_INPUT), 7036);
-    }
-
-    #[test]
-    fn test2() {
-        assert_eq!(part2(TEST_INPUT), 45);
-    }
-}

src/day17.rs

@@ -1,142 +0,0 @@
-use std::{fs::read_to_string, ops::BitXor};
-
-use itertools::Itertools;
-
-pub fn day_main() {
-    let input = read_to_string("input/day17.txt").unwrap();
-    let input = input.trim();
-    println!(" part1: {}", part1(input));
-    println!(" part2: {}", part2(input));
-}
-
-type RiddleResult = String;
-
-fn part1(input: &str) -> RiddleResult {
-    let (a, b, c, program) = parse_input(input);
-
-    run(&program, a, b, c)
-        .into_iter()
-        .map(|it| it.to_string())
-        .join(",")
-}
-
-fn run(program: &Vec<i64>, mut a: i64, mut b: i64, mut c: i64) -> Vec<i64> {
-    let mut ip = 0;
-    let mut output = vec![];
-
-    while ip < program.len() {
-        let opcode = program[ip];
-        let operand = program[(ip + 1) % program.len()];
-        match opcode {
-            0 => a = a / (2i64.pow(val(a, b, c, operand) as u32)),
-            1 => b = b.bitxor(operand),
-            2 => b = val(a, b, c, operand) % 8,
-            3 => {
-                if a == 0 {
-                } else {
-                    ip = operand as usize;
-                    continue;
-                }
-            }
-            4 => b = b.bitxor(c),
-            5 => output.push(val(a, b, c, operand) % 8),
-            6 => b = a / (2i64.pow(val(a, b, c, operand) as u32)),
-            7 => c = a / (2i64.pow(val(a, b, c, operand) as u32)),
-            _ => panic!("illegal op code {}", opcode),
-        }
-        ip += 2;
-    }
-    output
-}
-
-fn parse_input(input: &str) -> (i64, i64, i64, Vec<i64>) {
-    let (first, second) = input.split_once("\n\n").unwrap();
-    let mut registers = first.lines().map(|line| line.split_once(": ").unwrap().1);
-
-    let a = registers.next().unwrap().parse::<i64>().unwrap();
-    let b = registers.next().unwrap().parse::<i64>().unwrap();
-    let c = registers.next().unwrap().parse::<i64>().unwrap();
-
-    let program = second
-        .split_once(": ")
-        .unwrap()
-        .1
-        .split(",")
-        .map(|v| v.parse::<i64>().unwrap())
-        .collect_vec();
-    (a, b, c, program)
-}
-
-fn val(a: i64, b: i64, c: i64, operand: i64) -> i64 {
-    match operand {
-        0..=3 => operand,
-        4 => a,
-        5 => b,
-        6 => c,
-        _ => panic!("illegal operand {}", operand),
-    }
-}
-
-fn part2(input: &str) -> RiddleResult {
-    let (_, _, _, program) = parse_input(input);
-    solve(&program, program.len() - 1, 0).unwrap().to_string()
-}
-
-fn solve(program: &Vec<i64>, index: usize, a: i64) -> Option<i64> {
-    // if index == 0 {
-    //     return if &run(program, a, 0, 0) == program {
-    //         Some(a)
-    //     } else {
-    //         None
-    //     };
-    // }
-    for i in 0..8 {
-        let next_a = a * 8 + i;
-        let o = run(program, next_a, 0, 0);
-        if o[0] == program[index] {
-            if index == 0 {
-                return Some(next_a);
-            } else {
-                let m = solve(program, index - 1, next_a);
-                if m.is_some() {
-                    return m;
-                }
-            }
-        }
-    }
-    None
-}
-
-#[cfg(test)]
-mod test {
-    use super::{part1, part2};
-
-    const TEST_INPUT: &str = r"
-Register A: 729
-Register B: 0
-Register C: 0
-
-Program: 0,1,5,4,3,0
-    ";
-
-    #[test]
-    fn test1() {
-        assert_eq!(part1(TEST_INPUT.trim()), "4,6,3,5,6,3,5,2,1,0".to_string());
-    }
-
-    #[test]
-    fn test2() {
-        assert_eq!(
-            part2(
-                "Register A: 2024
-Register B: 0
-Register C: 0
-
-Program: 0,3,5,4,3,0
-"
-                .trim()
-            ),
-            "117440".to_string()
-        );
-    }
-}

src/day19.rs

@@ -1,98 +0,0 @@
-use std::{
-    collections::{HashMap, HashSet},
-    fs::read_to_string,
-};
-
-pub fn day_main() {
-    let input = read_to_string("input/day19.txt").unwrap();
-    let input = input.trim();
-    println!(" part1: {}", part1(input));
-    println!(" part2: {}", part2(input));
-}
-
-type RiddleResult = usize;
-
-fn part1(input: &str) -> RiddleResult {
-    let (a, b) = input.split_once("\n\n").unwrap();
-    let towels: HashSet<&str> = a.split(", ").collect();
-    b.lines().filter(|line| possible(line, &towels)).count()
-}
-
-fn possible(line: &str, towels: &HashSet<&str>) -> bool {
-    if line.is_empty() {
-        return true;
-    }
-    for t in towels.iter() {
-        if let Some(suffix) = line.strip_prefix(t) {
-            if possible(suffix, towels) {
-                return true;
-            }
-        }
-    }
-    false
-}
-
-fn countp<'a>(
-    line: &'a str,
-    towels: &HashSet<&str>,
-    solved: &mut HashMap<&'a str, usize>,
-) -> usize {
-    if line.is_empty() {
-        return 1;
-    }
-    if let Some(count) = solved.get(line) {
-        return *count;
-    }
-    let mut summed = 0;
-    for t in towels.iter() {
-        if let Some(suffix) = line.strip_prefix(t) {
-            summed += countp(suffix, towels, solved);
-        }
-    }
-    solved.insert(line, summed);
-    summed
-}
-fn part2(input: &str) -> RiddleResult {
-    let (a, b) = input.split_once("\n\n").unwrap();
-    let towels: HashSet<&str> = a.split(", ").collect();
-    b.lines()
-        .map(|line| countp(line, &towels, &mut HashMap::new()))
-        .sum()
-}
-
-#[cfg(test)]
-mod test {
-    use std::collections::HashSet;
-
-    use crate::day19::possible;
-
-    use super::{part1, part2};
-
-    const TEST_INPUT: &str = r"r, wr, b, g, bwu, rb, gb, br
-
-brwrr
-bggr
-gbbr
-rrbgbr
-ubwu
-bwurrg
-brgr
-bbrgwb
-";
-
-    #[test]
-    fn test1() {
-        assert_eq!(part1(TEST_INPUT), 6);
-    }
-
-    #[test]
-    fn solver() {
-        let set = HashSet::from_iter(["r", "wr", "b", "g", "bwu", "rb", "gb", "br"]);
-        assert!(possible("bwurrg", &set));
-    }
-
-    #[test]
-    fn test2() {
-        assert_eq!(part2(TEST_INPUT), 16);
-    }
-}

src/day22.rs

@@ -1,62 +0,0 @@
-use std::{fs::read_to_string, ops::BitXor};
-
-pub fn day_main() {
-    let input = read_to_string("input/day22.txt").unwrap();
-    let input = input.trim();
-    println!(" part1: {}", part1(input));
-    println!(" part2: {}", part2(input));
-}
-
-type RiddleResult = i64;
-
-fn part1(input: &str) -> RiddleResult {
-    input.lines().map(|is| solution(is.parse().unwrap())).sum()
-}
-
-fn solution(initial_secret: i64) -> i64 {
-    let mut secret = initial_secret;
-    for _ in 0..2000 {
-        secret = prune(mix(secret * 64, secret));
-        secret = prune(mix(secret / 32, secret));
-        secret = prune(mix(secret * 2048, secret))
-    }
-    secret
-}
-
-fn mix(value: i64, secret: i64) -> i64 {
-    value.bitxor(secret)
-}
-
-fn prune(value: i64) -> i64 {
-    value % 16777216
-}
-
-fn part2(_input: &str) -> RiddleResult {
-    0
-}
-
-#[cfg(test)]
-mod test {
-    use super::{part1, part2};
-
-    const TEST_INPUT: &str = r"";
-
-    #[test]
-    fn test1() {
-        assert_eq!(
-            part1(
-                "1
-10
-100
-2024
-"
-            ),
-            37327623
-        );
-    }
-
-    #[test]
-    fn test2() {
-        assert_eq!(part2(TEST_INPUT), 0);
-    }
-}

src/lib.rs

@@ -10,12 +10,5 @@ pub mod day09;
 pub mod day10;
 pub mod day11;
 pub mod day12;
-pub mod day13;
-pub mod day14;
-pub mod day15;
-pub mod day16;
-pub mod day17;
-pub mod day19;
-pub mod day22;
 // PLACEHOLDER
 pub mod utils;

src/main.rs

@@ -17,13 +17,6 @@ fn main() {
         (10, day10::day_main),
         (11, day11::day_main),
         (12, day12::day_main),
-        (13, day13::day_main),
-        (14, day14::day_main),
-        (15, day15::day_main),
-        (16, day16::day_main),
-        (17, day17::day_main),
-        (19, day19::day_main),
-        (22, day22::day_main),
         // PLACEHOLDER
     ]);
     let day: Option<u8> = args().nth(1).and_then(|a| a.parse().ok());

src/utils/grid.rs

@@ -89,15 +89,6 @@ impl<T> Grid<T> {
         })
     }
 
-    pub fn entries_mut(&mut self) -> impl Iterator<Item = (Coord, &mut T)> {
-        self.content.iter_mut().enumerate().map(|(i, val)| {
-            (
-                (i as i64 % self.content_width, i as i64 / self.content_width),
-                val,
-            )
-        })
-    }
-
     pub fn map_values<U>(self, f: fn(T) -> U) -> Grid<U> {
         let new_content = self.content.into_iter().map(f).collect_vec();
         Grid {
@@ -108,21 +99,6 @@ impl<T> Grid<T> {
     }
 }
 
-impl<T> Grid<T>
-where
-    T: Default,
-{
-    pub fn from_default(width: i64, height: i64) -> Grid<T> {
-        let mut content: Vec<T> = Vec::with_capacity((width * height) as usize);
-        content.resize_with((width * height) as usize, Default::default);
-        Grid {
-            content_width: width,
-            content_height: height,
-            content,
-        }
-    }
-}
-
 impl Grid<char> {
     pub fn parse(input: &str) -> Grid<char> {
         let content_width = input.lines().next().unwrap().len();
@@ -139,15 +115,6 @@ impl Grid<char> {
             content,
         }
     }
-
-    pub fn print(&self) {
-        for line in &self.content.iter().chunks(self.content_width as usize) {
-            for c in line.into_iter() {
-                print!("{c}");
-            }
-            println!();
-        }
-    }
 }
 
 impl<T> Index<Coord> for Grid<T> {