Part 11

src/bin/part11.rs

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+use std::time;
+
+
+#[derive(Debug, Clone)]
+#[allow(dead_code)]
+struct Galaxy {
+    id: u16,
+    x: i16,
+    y: i16,
+}
+
+fn main() {
+    let t1 = time::Instant::now();
+    let mut galaxy_map = load_input();
+    let d1 = t1.elapsed();
+    println!("Loading: {:?}", d1);
+
+    let t2 = time::Instant::now();
+    expand_map(&mut galaxy_map);
+    //print_map(&galaxy_map);
+    let d2 = t2.elapsed();
+    println!("Expanding: {:?}", d2);
+
+    let t3 = time::Instant::now();
+    let parsed_map = parse_map(&galaxy_map);
+    //println!("{:?}", parsed_map);
+    let d3 = t3.elapsed();
+    println!("Parsing: {:?}", d3);
+
+    let t4 = time::Instant::now();
+    let distances = calc_distances(&parsed_map);
+    let d4 = t4.elapsed();
+    println!("Calculating: {:?}", d4);
+
+    let d5 = t1.elapsed();
+    let sum_distances = distances.iter().sum::<u32>();
+    println!("Summing: {:?}", d5);
+    println!("Total: {:?}", d1 + d2 + d3 + d4 + d5);
+    println!("Sum of distances: {}", sum_distances);
+}
+
+fn calc_distances(galaxies: &Vec<Galaxy>) -> Vec<u32> {
+    let mut distances = Vec::new();
+
+    for (i, g1) in galaxies.iter().enumerate() {
+        for g2 in &galaxies[i + 1..] {
+            let distance = ((g2.x - g1.x).abs() + (g2.y - g1.y).abs()) as u32;
+            distances.push(distance);
+        }
+    }
+
+    distances
+}
+
+fn parse_map(galaxy_map: &Vec<Vec<bool>>) -> Vec<Galaxy> {
+    let mut galaxies = Vec::new();
+
+    for (y, row) in galaxy_map.iter().enumerate() {
+        for (x, c) in row.iter().enumerate() {
+            if *c {
+                galaxies.push(Galaxy {
+                    id: galaxies.len() as u16 + 1,
+                    x: x as i16,
+                    y: y as i16,
+                });
+            }
+        }
+    }
+
+    galaxies
+}
+
+#[allow(dead_code)]
+fn print_map(galaxy_map: &Vec<Vec<bool>>) {
+    for row in galaxy_map {
+        for c in row {
+            print!("{}", if *c { '#' } else { '.' });
+        }
+        println!();
+    }
+}
+
+fn expand_map(galaxy_map: &mut Vec<Vec<bool>>) {
+    let mut new_map = Vec::new();
+
+    for row in &mut *galaxy_map {
+        new_map.push(row.clone());
+        if row.iter().all(|c| !*c) {
+            new_map.push(row.repeat(1_000_000));
+        }
+    }
+
+    let mut shift_offset = 0;
+    for (i, _) in galaxy_map[0].iter().enumerate() {
+        if galaxy_map.iter().all(|row| !row[i]) {
+            for row in new_map.iter_mut() {
+                row.insert(i + shift_offset, false);
+            }
+            shift_offset += 1;
+        }
+    }
+
+    *galaxy_map = new_map;
+}
+
+fn load_input() -> Vec<Vec<bool>> {
+    let data = std::fs::read_to_string("src/bin/sources/part11.txt")
+        .expect("Could not read file")
+        .lines()
+        .map(|line| {
+            line.chars()
+                .map(|c| {
+                    match c {
+                        '#' => true,
+                        '.' => false,
+                        _ => panic!("Invalid input")
+                    }
+                })
+                .collect::<Vec<_>>()
+        })
+        .collect::<Vec<_>>();
+
+    data
+}

src/bin/sources/part11.sample

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+...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....

src/bin/sources/part11.txt

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