day11

Cargo.lock

@@ -88,6 +88,15 @@ dependencies = [
  "aoc_libs",
 ]
 
+[[package]]
+name = "day11"
+version = "0.1.0"
+dependencies = [
+ "aoc_libs",
+ "collection_literals",
+ "itertools",
+]
+
 [[package]]
 name = "either"
 version = "1.9.0"

aoc_libs/src/distances.rs

@@ -0,0 +1,3 @@
+pub trait Distances{
+    fn taxicab_distance(&self, other: &Self)->usize;
+}

aoc_libs/src/lib.rs

@@ -1,3 +1,4 @@
 pub mod points;
 pub mod range;
 pub mod misc;
+pub mod distances;

aoc_libs/src/points.rs

@@ -1,3 +1,5 @@
+use crate::distances::Distances;
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Hash)]
 pub struct Point {
     pub x: isize,
@@ -16,6 +18,12 @@ impl Point {
     }
 }
 
+impl Distances for Point {
+    fn taxicab_distance(&self, other: &Self) -> usize {
+        self.x.abs_diff(other.x) + self.y.abs_diff(other.y)
+    }
+}
+
 impl std::ops::Add for Point {
     type Output = Point;
 
@@ -62,7 +70,7 @@ impl std::ops::Neg for Point {
 }
 
 /// an unsigned point in 2d space
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct UPoint {
     pub x: usize,
     pub y: usize,
@@ -80,6 +88,12 @@ impl UPoint {
     }
 }
 
+impl Distances for UPoint {
+    fn taxicab_distance(&self, other: &Self) -> usize {
+        self.x.abs_diff(other.x) + self.y.abs_diff(other.y)
+    }
+}
+
 impl std::ops::Add for UPoint {
     type Output = UPoint;
 
@@ -184,7 +198,9 @@ where
     }
 }
 
-impl<T, const X: usize, const Y: usize> std::ops::IndexMut<Point> for FourQuadrantMatrix<{ X }, { Y }, T> {
+impl<T, const X: usize, const Y: usize> std::ops::IndexMut<Point>
+    for FourQuadrantMatrix<{ X }, { Y }, T>
+{
     fn index_mut(&mut self, index: Point) -> &mut Self::Output {
         let upoint = index
             .to_upoint(&self.zero_coord)
@@ -193,7 +209,9 @@ impl<T, const X: usize, const Y: usize> std::ops::IndexMut<Point> for FourQuadra
     }
 }
 
-impl<T, const X: usize, const Y: usize> std::ops::Index<Point> for FourQuadrantMatrix<{ X }, { Y }, T> {
+impl<T, const X: usize, const Y: usize> std::ops::Index<Point>
+    for FourQuadrantMatrix<{ X }, { Y }, T>
+{
     type Output = T;
 
     fn index(&self, index: Point) -> &Self::Output {

days/day06/src/parse.rs

@@ -115,19 +115,6 @@ mod tests {
         assert_eq!(input.num_ways_to_win(), 71503);
     }
 
-    #[test]
-    fn test_distance_given_charge_time() {
-        let input = Race { time: 7, record: 9 };
-        assert_eq!(input.distance_given_charge_time(0), 0);
-        assert_eq!(input.distance_given_charge_time(1), 6);
-        assert_eq!(input.distance_given_charge_time(2), 10);
-        assert_eq!(input.distance_given_charge_time(3), 12);
-        assert_eq!(input.distance_given_charge_time(4), 12);
-        assert_eq!(input.distance_given_charge_time(5), 10);
-        assert_eq!(input.distance_given_charge_time(6), 6);
-        assert_eq!(input.distance_given_charge_time(7), 0);
-    }
-
     #[test]
     fn test_parse_part2() {
         let input = concat!("Time:      7  15   30\n", "Distance:  9  40  200\n",);

days/day11/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "day11"
+authors.workspace = true
+description.workspace = true
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+aoc_libs.workspace = true
+collection_literals.workspace = true
+itertools.workspace = true

days/day11/src/input.txt

@@ -0,0 +1,140 @@
+.#..........#.....................#........................................................#....................................#...........
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days/day11/src/main.rs

@@ -0,0 +1,14 @@
+mod part1;
+mod part2;
+mod parse;
+
+fn main() {
+    let input = include_str!("./input.txt");
+    let structured_input = parse::parse(input);
+
+    println!("Part One");
+    println!("Result: {}", part1::part1(&structured_input));
+
+    println!("Part Two");
+    println!("Result: {}", part2::part2(&structured_input));
+}

days/day11/src/parse.rs

@@ -0,0 +1,388 @@
+use std::collections::HashSet;
+
+use aoc_libs::distances::Distances;
+use aoc_libs::points::UPoint;
+use itertools::Itertools;
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum Space {
+    Galaxy,
+    Space,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct SparseSpace {
+    galaxies: HashSet<UPoint>,
+    empty_rows: HashSet<usize>,
+    empty_columns: HashSet<usize>,
+}
+
+impl SparseSpace {
+    pub fn get_distance_between_galaxies(
+        &self,
+        galaxy1: &UPoint,
+        galaxy2: &UPoint,
+        expantion: &usize,
+    ) -> usize {
+        // println!("distance between {:?} and {:?}", galaxy1, galaxy2);
+
+        //get unexpanded distance.
+        let mut distance = galaxy1.taxicab_distance(galaxy2);
+        // println!("unexpanded distance is {}", distance);
+
+        //expand rows
+        for y in galaxy1.y.min(galaxy2.y)+1..galaxy1.y.max(galaxy2.y) {
+            if self.empty_rows.contains(&y) {
+                // println!("expanding row {}", y);
+                distance += expantion
+            }
+        }
+
+        //expand columns.
+        for x in galaxy1.x.min(galaxy2.x)+1..galaxy1.x.max(galaxy2.x) {
+            if self.empty_columns.contains(&x) {
+                // println!("expanding col {}", x);
+                distance += expantion
+            }
+        }
+        distance
+    }
+
+    pub fn get_sum_of_distances(&self, expantion: usize) -> usize {
+        self.galaxies
+            .iter()
+            .combinations(2)
+            // .inspect(|pair| println!("{:?}", pair))
+            .map(|pair| self.get_distance_between_galaxies(pair[0], pair[1], &expantion))
+            // .inspect(|distance| println!("{:?}", distance))
+            .sum()
+    }
+}
+
+impl From<Vec<Vec<Space>>> for SparseSpace {
+    fn from(value: Vec<Vec<Space>>) -> Self {
+        let mut galaxies: HashSet<UPoint> = HashSet::new();
+        let mut empty_rows: HashSet<usize> = HashSet::new();
+        let mut empty_columns: HashSet<usize> = HashSet::new();
+        //find all galaxies and empty rows.
+        for (y, row) in value.iter().enumerate() {
+            let mut has_galaxy = false;
+            for (x, space) in row.iter().enumerate() {
+                if *space == Space::Galaxy {
+                    has_galaxy = true;
+                    galaxies.insert(UPoint { x, y });
+                };
+            }
+            if !has_galaxy {
+                empty_rows.insert(y);
+            };
+        }
+
+        //find all empty columns
+        for x in 0..value[0].len() {
+            let mut has_galaxy = false;
+            for y in 0..value.len() {
+                if value[y][x] == Space::Galaxy {
+                    has_galaxy = true;
+                }
+            }
+            if !has_galaxy {
+                empty_columns.insert(x);
+            };
+        }
+
+        SparseSpace {
+            galaxies,
+            empty_rows,
+            empty_columns,
+        }
+    }
+}
+
+pub fn parse(input: &str) -> SparseSpace {
+    parse_to_space(input).into()
+}
+
+pub fn parse_to_space(input: &str) -> Vec<Vec<Space>> {
+    input
+        .lines()
+        .map(|l| {
+            l.chars()
+                .map(|c| match c {
+                    '#' => Space::Galaxy,
+                    '.' => Space::Space,
+                    _ => panic!("unexpected char {}", c),
+                })
+                .collect()
+        })
+        .collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use collection_literals::collection;
+
+    use super::*;
+
+    #[test]
+    fn test_get_sum_of_distances() {
+        let tested = SparseSpace {
+            galaxies: collection! {
+                UPoint { x: 0, y: 2 },
+                UPoint { x: 0, y: 9 },
+                UPoint { x: 1, y: 5 },
+                UPoint { x: 3, y: 0 },
+                UPoint { x: 4, y: 9 },
+                UPoint { x: 6, y: 4 },
+                UPoint { x: 7, y: 1 },
+                UPoint { x: 7, y: 8 },
+                UPoint { x: 9, y: 6 }
+            },
+            empty_rows: collection! {3, 7},
+            empty_columns: collection! {2, 5, 8},
+        };
+        assert_eq!(tested.get_sum_of_distances(1), 374)
+    }
+
+    #[test]
+    fn test_get_distance_between_galaxies() {
+        let tested = SparseSpace {
+            galaxies: collection! {
+                UPoint { x: 0, y: 2 },
+                UPoint { x: 0, y: 9 },
+                UPoint { x: 1, y: 5 },
+                UPoint { x: 3, y: 0 },
+                UPoint { x: 4, y: 9 },
+                UPoint { x: 6, y: 4 },
+                UPoint { x: 7, y: 1 },
+                UPoint { x: 7, y: 8 },
+                UPoint { x: 9, y: 6 }
+            },
+            empty_rows: collection! {3, 7},
+            empty_columns: collection! {2, 5, 8},
+        };
+        assert_eq!(
+            tested.get_distance_between_galaxies(
+                &UPoint { x: 4, y: 9 },
+                &UPoint { x: 1, y: 5 },
+                &1
+            ),
+            9
+        );
+        assert_eq!(
+            tested.get_distance_between_galaxies(
+                &UPoint { x: 7, y: 8 },
+                &UPoint { x: 0, y: 3 },
+                &1
+            ),
+            15
+        );
+        assert_eq!(
+            tested.get_distance_between_galaxies(
+                &UPoint { x: 0, y: 2 },
+                &UPoint { x: 9, y: 6 },
+                &1
+            ),
+            17
+        );
+        assert_eq!(
+            tested.get_distance_between_galaxies(
+                &UPoint { x: 0, y: 9 },
+                &UPoint { x: 4, y: 9 },
+                &1
+            ),
+            5
+        );
+        assert_eq!(
+            tested.get_distance_between_galaxies(
+                &UPoint { x: 3, y: 0 },
+                &UPoint { x: 6, y: 4 },
+                &1
+            ),
+            9
+        );
+        assert_eq!(
+            tested.get_distance_between_galaxies(
+                &UPoint { x: 7, y: 8 },
+                &UPoint { x: 7, y: 8 },
+                &1
+            ),
+            0
+        );
+    }
+
+    #[test]
+    fn test_parse() {
+        let input = concat!(
+            "...#......\n",
+            ".......#..\n",
+            "#.........\n",
+            "..........\n",
+            "......#...\n",
+            ".#........\n",
+            ".........#\n",
+            "..........\n",
+            ".......#..\n",
+            "#...#.....\n",
+        );
+        assert_eq!(
+            parse(input),
+            SparseSpace {
+                galaxies: collection! {
+                    UPoint { x: 0, y: 2 },
+                    UPoint { x: 0, y: 9 },
+                    UPoint { x: 1, y: 5 },
+                    UPoint { x: 3, y: 0 },
+                    UPoint { x: 4, y: 9 },
+                    UPoint { x: 6, y: 4 },
+                    UPoint { x: 7, y: 1 },
+                    UPoint { x: 7, y: 8 },
+                    UPoint { x: 9, y: 6 }
+                },
+                empty_rows: collection! {3, 7},
+                empty_columns: collection! {2, 5, 8}
+            }
+        )
+    }
+
+    #[test]
+    fn test_parse_to_space() {
+        let input = concat!(
+            "...#......\n",
+            ".......#..\n",
+            "#.........\n",
+            "..........\n",
+            "......#...\n",
+            ".#........\n",
+            ".........#\n",
+            "..........\n",
+            ".......#..\n",
+            "#...#.....\n",
+        );
+        assert_eq!(
+            parse_to_space(input),
+            vec![
+                vec![
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Galaxy,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space
+                ],
+                vec![
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Galaxy,
+                    Space::Space,
+                    Space::Space
+                ],
+                vec![
+                    Space::Galaxy,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space
+                ],
+                vec![
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space
+                ],
+                vec![
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Galaxy,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space
+                ],
+                vec![
+                    Space::Space,
+                    Space::Galaxy,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space
+                ],
+                vec![
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Galaxy
+                ],
+                vec![
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space
+                ],
+                vec![
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Galaxy,
+                    Space::Space,
+                    Space::Space
+                ],
+                vec![
+                    Space::Galaxy,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Galaxy,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space,
+                    Space::Space
+                ]
+            ]
+        );
+    }
+}

days/day11/src/part1.rs

@@ -0,0 +1,27 @@
+use crate::parse::*;
+
+pub fn part1(input: &SparseSpace) -> usize {
+    input.get_sum_of_distances(1)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() {
+        let input = concat!(
+            "...#......\n",
+            ".......#..\n",
+            "#.........\n",
+            "..........\n",
+            "......#...\n",
+            ".#........\n",
+            ".........#\n",
+            "..........\n",
+            ".......#..\n",
+            "#...#.....\n",
+        );
+        assert_eq!(part1(&parse(input)), 374)
+    }
+}

days/day11/src/part2.rs

@@ -0,0 +1,28 @@
+use crate::parse::*;
+
+pub fn part2(input: &SparseSpace) -> usize {
+    input.get_sum_of_distances(999_999)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part2() {
+        let input = concat!(
+            "...#......\n",
+            ".......#..\n",
+            "#.........\n",
+            "..........\n",
+            "......#...\n",
+            ".#........\n",
+            ".........#\n",
+            "..........\n",
+            ".......#..\n",
+            "#...#.....\n",
+        );
+        assert_eq!(parse(input).get_sum_of_distances(9), 1030);
+        assert_eq!(parse(input).get_sum_of_distances(99), 8410);
+    }
+}