day 11

aoc_puzzle_cache/day_11

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src/bin/day11.rs

@@ -0,0 +1,173 @@
+use aoc23::prelude::*;
+use derive_builder::Builder;
+use itertools::Itertools;
+use rayon::prelude::*;
+use std::{str::FromStr, time::Instant};
+
+static DAY: u8 = 11;
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+struct Vec2D {
+    x: usize,
+    y: usize,
+}
+
+impl From<(usize, usize)> for Vec2D {
+    fn from(value: (usize, usize)) -> Self {
+        Self {
+            x: value.0,
+            y: value.1,
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+struct Space {
+    galaxies: Vec<Vec2D>,
+    x_max: usize,
+    y_max: usize,
+}
+
+impl Space {
+    fn new(s: &str) -> Result<Self> {
+        let mut x_max = 0;
+        let mut y_max = 0;
+        let mut galaxies = vec![];
+        for (y, row) in s.trim().lines().enumerate() {
+            for (x, col) in row.chars().enumerate() {
+                if col == '#' {
+                    galaxies.push((x, y).into());
+                }
+                x_max = x;
+            }
+            y_max = y;
+        }
+        Ok(Space {
+            galaxies,
+            x_max,
+            y_max,
+        })
+    }
+
+    fn expand(&mut self, by: usize) {
+        for y in (0..=self.y_max).rev() {
+            if self.galaxies.iter().filter(|g| g.y == y).count() == 0 {
+                self.galaxies
+                    .iter_mut()
+                    .filter(|g| g.y > y)
+                    .for_each(|g| g.y += by);
+            }
+        }
+        for x in (0..=self.x_max).rev() {
+            if self.galaxies.iter().filter(|g| g.x == x).count() == 0 {
+                self.galaxies
+                    .iter_mut()
+                    .filter(|g| g.x > x)
+                    .for_each(|g| g.x += by);
+            }
+        }
+    }
+
+    fn galaxy_pairs(&self) -> Vec<(&Vec2D, &Vec2D)> {
+        let mut galaxy_pairs = vec![];
+        for i in 0..self.galaxies.len() {
+            for i2 in i + 1..self.galaxies.len() {
+                galaxy_pairs.push((&self.galaxies[i], &self.galaxies[i2]));
+            }
+        }
+        galaxy_pairs
+    }
+}
+
+fn part1(input: String) -> Result<usize> {
+    // parse
+    let start = Instant::now();
+    let mut space = Space::new(&input)?;
+    let parsed_time = start.elapsed();
+    let step_start = Instant::now();
+    space.expand(1);
+    let expansion_time = step_start.elapsed();
+
+    // algo
+    let step_start = Instant::now();
+    let mut answer = 0;
+    for pair in space.galaxy_pairs() {
+        let distance = pair.0.y.abs_diff(pair.1.y) + pair.0.x.abs_diff(pair.1.x);
+        answer += distance;
+    }
+    let algo_time = step_start.elapsed();
+
+    // output
+    println!("part 1: {answer}\t[total: {:?}]", start.elapsed());
+    println!("\tparse: {parsed_time:?}");
+    println!("\texpansion: {expansion_time:?}");
+    println!("\talgo: {algo_time:?}");
+    Ok(answer)
+}
+
+fn part2(input: String) -> Result<usize> {
+    // parse
+    let start = Instant::now();
+    let mut space = Space::new(&input)?;
+    let parsed_time = start.elapsed();
+    let step_start = Instant::now();
+    space.expand(1000000 - 1);
+    let expansion_time = step_start.elapsed();
+
+    // algo
+    let step_start = Instant::now();
+    let mut answer = 0;
+    for pair in space.galaxy_pairs() {
+        let distance = pair.0.y.abs_diff(pair.1.y) + pair.0.x.abs_diff(pair.1.x);
+        answer += distance;
+    }
+    let algo_time = step_start.elapsed();
+
+    // output
+    println!("part 2: {answer}\t[total: {:?}]", start.elapsed());
+    println!("\tparse: {parsed_time:?}");
+    println!("\texpansion: {expansion_time:?}");
+    println!("\talgo: {algo_time:?}");
+    Ok(answer)
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    println!("Day {DAY}");
+    println!("=====");
+    let input = utils::aoc::get_puzzle_input(DAY).await?;
+    part1(input.clone())?;
+    part2(input.clone())?;
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    static DATA: &'static str = "...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....
+";
+
+    #[test]
+    fn test_part_1() -> Result<()> {
+        assert_eq!(part1(DATA.to_owned())?, 374);
+        Ok(())
+    }
+
+    #[test]
+    // Must set the space.expand(1000000 - 1); to (100 - 1) instead for this test
+    #[ignore]
+    fn test_part_2() -> Result<()> {
+        assert_eq!(part2(DATA.to_owned())?, 8410);
+        Ok(())
+    }
+}

src/bin/template.rs

@@ -6,12 +6,12 @@ use std::{str::FromStr, time::Instant};
 
 static DAY: u8 = TODO;
 
-#[derive(Debug, Builder, Clone)]
+#[derive(Debug, Clone)]
 struct Todo {}
 
 impl Todo {
     fn new(s: &str) -> Result<Self> {
-        Ok(TodoBuilder::default().build()?)
+        Ok(Todo {})
     }
 }