feat: added day 14 part 1 and 2

Signed-off-by: Louis Vallat <contact@louis-vallat.dev>

.gitea/workflows/build_and_run.yml

@@ -11,7 +11,7 @@ jobs:
     name: Challenge for day
     strategy:
       matrix:
-        day_number: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
+        day_number: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
     runs-on: rust-bookworm
     steps:
       - name: Check out repository code

day14/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "day14"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

day14/src/main.rs

@@ -0,0 +1,121 @@
+use std::{env, fs};
+
+#[derive(Debug, Clone)]
+struct Robot {
+    position: (i32, i32),
+    direction: (i32, i32),
+}
+
+impl Robot {
+    fn advance(&mut self, steps: i32, board_height: i32, board_width: i32) {
+        self.position.0 = (self.position.0 + steps * (board_height + self.direction.0)) % board_height;
+        self.position.1 = (self.position.1 + steps * (board_width + self.direction.1)) % board_width;
+    }
+}
+
+
+fn read_input(path: &str) -> String {
+    fs::read_to_string(path).expect("Cannot read file.")
+}
+
+fn parse_input(input: &str) -> Vec<Robot> {
+    let mut robots = Vec::new();
+    for line in input.lines().filter(|line| !line.is_empty()) {
+        let halves = line.split_once(' ').unwrap();
+        let p = halves.0[2..].split_once(',').unwrap();
+        let v = halves.1[2..].split_once(',').unwrap();
+        robots.push(Robot {
+            position: (p.1.parse().unwrap(), p.0.parse().unwrap()),
+            direction: (v.1.parse().unwrap(), v.0.parse().unwrap()),
+        });
+    }
+
+    robots
+}
+
+fn is_trunk(map: &Vec<Vec<u32>>, position: (usize, usize)) -> bool {
+    for i in 0..=6 {
+        for j in 0..=3 {
+            if map[position.0 + i][position.0 + j] == 0 {
+                return false;
+            }
+        }
+    }
+    true
+}
+
+fn place_robots(robots: &Vec<Robot>, height: usize, width: usize) -> Vec<Vec<u32>> {
+    let mut map: Vec<Vec<u32>> = vec![vec![0; width]; height];
+
+    for robot in robots {
+        map[robot.position.0 as usize][robot.position.1 as usize] = 1;
+    }
+
+    map
+}
+
+fn display_map(map: &Vec<Vec<u32>>) {
+    println!("┌{:─<1$}┐", "", map[0].len());
+    for line in map {
+        print!("│");
+        for r in line {
+            print!("{}", if *r == 0 { " " } else { "█"});
+        }
+        println!("│");
+    }
+    println!("└{:─<1$}┘", "", map[0].len());
+}
+
+fn part_1(robots: &Vec<Robot>) -> i32 {
+    let mut robots = robots.clone();
+    let (height, width) = (103, 101);
+    let mut quadrants = vec![0; 4];
+    for robot in robots.iter_mut() {
+        robot.advance(100, height, width);
+        if robot.position.0 != height / 2 && robot.position.1 != width / 2 {
+            quadrants[(robot.position.0 / (height / 2 + 1) * 2 + robot.position.1 / (width / 2 + 1)) as usize] += 1;
+        }
+    }
+
+    quadrants.iter().fold(1, |acc, i| acc * i)
+}
+
+fn part_2(robots: &Vec<Robot>) -> (i32, Vec<Vec<u32>>) {
+    let mut robots = robots.clone();
+    let (height, width) = (103, 101);
+    let mut map = place_robots(&robots, height, width);
+    let mut step = 1;
+    loop {
+        for robot in robots.iter_mut() {
+            if map[robot.position.0 as usize][robot.position.1 as usize] > 0 {
+                map[robot.position.0 as usize][robot.position.1 as usize] -= 1;
+            }
+            robot.advance(1, height as i32, width as i32);
+            map[robot.position.0 as usize][robot.position.1 as usize] += 1;
+        }
+
+        for i in 0..97 {
+            for j in 0..98 {
+                if is_trunk(&map, (i, j)) {
+                    return (step, map);
+                }
+            }
+        }
+        step += 1;
+    }
+}
+
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    for arg in args.iter().skip(1) {
+        let input = read_input(&arg);
+        let robots = parse_input(&input);
+        let (part_2, map) = part_2(&robots);
+        println!("[{}]", &arg);
+        println!("\t[Part 1] => Answer is '{}'.", part_1(&robots));
+        println!("\t[Part 2] => Answer is '{}'.", part_2);
+        println!("\t[BONUS] =>");
+        display_map(&map);
+    }
+}