Day 11 Complete

src/input/day11

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src/input/day11_test1

@@ -0,0 +1,10 @@
+...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....

src/input/day11_test2

@@ -0,0 +1,10 @@
+...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....

src/main.rs

@@ -18,7 +18,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
         Box::new(day08::Day08 {}),
         Box::new(day09::Day09 {}),
         Box::new(day10::Day10 {}),
-        // Box::new(day11::Day11 {}),
+        Box::new(day11::Day11 {}),
         // Box::new(day12::Day12 {}),
         // Box::new(day13::Day13 {}),
         // Box::new(day14::Day14 {}),

src/solutions/day11.rs

@@ -1,20 +1,30 @@
 use super::Solution;
 
+use itertools::Itertools;
+
 pub struct Day11 {}
 
 impl Solution for Day11 {
     fn part1(
         &self,
-        _input: &mut Vec<String>,
+        input: &mut Vec<String>,
     ) -> Result<Box<dyn std::fmt::Display + Sync>, Box<dyn std::error::Error>> {
-        Ok(Box::new("Ready"))
+        let (universe, mut galaxy) = self.get_universe(input);
+
+        Ok(Box::new(self.get_distance(&universe, &mut galaxy, 2)))
     }
 
     fn part2(
         &self,
-        _input: &mut Vec<String>,
+        input: &mut Vec<String>,
     ) -> Result<Box<dyn std::fmt::Display + Sync>, Box<dyn std::error::Error>> {
-        Ok(Box::new("Ready"))
+        let (universe, mut galaxy) = self.get_universe(input);
+
+        Ok(Box::new(self.get_distance(
+            &universe,
+            &mut galaxy,
+            1_000_000,
+        )))
     }
 
     fn get_day(&self) -> u8 {
@@ -22,7 +32,56 @@ impl Solution for Day11 {
     }
 }
 
-impl Day11 {}
+impl Day11 {
+    fn get_universe<'a>(&'a self, input: &'a Vec<String>) -> (Vec<&'a [u8]>, Vec<(usize, usize)>) {
+        let universes = input.iter().map(|r| r.as_bytes()).collect::<Vec<_>>();
+
+        // Use the cartesian product between X and Y, (Y, X), to plot coords of galaxies
+        let galaxies = (0..universes.len())
+            .cartesian_product(0..universes[0].len())
+            .filter(|(y, x)| universes[*y][*x] == b'#')
+            .collect::<Vec<_>>();
+
+        (universes, galaxies)
+    }
+
+    fn get_distance(
+        &self,
+        universe: &Vec<&[u8]>,
+        galaxies: &mut Vec<(usize, usize)>,
+        expansion: usize,
+    ) -> usize {
+        let (rows, cols) = (universe.len(), universe[0].len());
+
+        let empty_rows = (0..rows).filter(|row| universe[*row].iter().all(|p| *p == b'.'));
+        let empty_cols = (0..cols).filter(|col| (0..rows).all(|row| universe[row][*col] == b'.'));
+
+        for row in empty_rows.rev() {
+            for galaxy in galaxies.iter_mut() {
+                // Increase distance between galaxies by 1 for each empty row they cross
+                if galaxy.0 > row {
+                    galaxy.0 += expansion - 1;
+                }
+            }
+        }
+
+        for col in empty_cols.rev() {
+            for galaxy in galaxies.iter_mut() {
+                // Increase distance between galaxies by 1 for each empty column they cross
+                if galaxy.1 > col {
+                    galaxy.1 += expansion - 1;
+                }
+            }
+        }
+
+        // get a vector of x, y distances between each galaxy
+        galaxies
+            .iter()
+            .tuple_combinations()
+            .map(|(g1, g2)| g1.0.abs_diff(g2.0) + g1.1.abs_diff(g2.1))
+            .sum()
+    }
+}
 
 /// Test from puzzle input
 #[cfg(test)]
@@ -44,7 +103,7 @@ mod test {
             .unwrap()
             .to_string();
 
-        assert_eq!(answer, "Ready");
+        assert_eq!(answer, "374");
     }
 
     #[test]
@@ -61,6 +120,6 @@ mod test {
             .unwrap()
             .to_string();
 
-        assert_eq!(answer, "Ready");
+        assert_eq!(answer, "82000210");
     }
 }