2023 - Day 11

2023/input/11/input

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2023/input/11/test-1

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2023/src/bin/day11.rs

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+#![feature(test)]
+use anyhow::Result;
+use aoc::Solver;
+
+// -- Runners --
+fn main() -> Result<()> {
+    Day::solve()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn part1_test1() -> Result<()> {
+        Day::test(Day::part1, "test-1", 374)
+    }
+
+    #[test]
+    fn part1_solution() -> Result<()> {
+        Day::test(Day::part1, "input", 10490062)
+    }
+
+    // NOTE: The given example for part2 are only for 10x and 100x, while part2 uses 1000000x
+    // Therefore there are now part2 example test
+
+    #[test]
+    fn part2_solution() -> Result<()> {
+        Day::test(Day::part2, "input", 382979724122)
+    }
+
+    // Benchmarks
+    extern crate test;
+    #[bench]
+    #[ignore]
+    fn part1_bench(b: &mut test::Bencher) {
+        Day::benchmark(Day::part1, b)
+    }
+    #[bench]
+    #[ignore]
+    fn part2_bench(b: &mut test::Bencher) {
+        Day::benchmark(Day::part2, b)
+    }
+}
+
+#[derive(Debug)]
+struct GridPoint {
+    galaxy: bool,
+    vertical_expansion: bool,
+    horizontal_expansion: bool,
+}
+
+fn distance(
+    a: (usize, usize),
+    b: (usize, usize),
+    grid: &[Vec<GridPoint>],
+    expansion: usize,
+) -> usize {
+    let (range_x, x_end) = if a.0 > b.0 {
+        (b.0..a.0, a.0)
+    } else {
+        (a.0..b.0, b.0)
+    };
+    let (range_y, y_start) = if a.1 > b.1 {
+        (b.1..a.1, b.1)
+    } else {
+        (a.1..b.1, a.1)
+    };
+
+    let mut steps = 0;
+    for x in range_x {
+        if grid[y_start][x].horizontal_expansion {
+            steps += expansion;
+        } else {
+            steps += 1;
+        }
+    }
+    for y in range_y {
+        if grid[y][x_end].vertical_expansion {
+            steps += expansion;
+        } else {
+            steps += 1;
+        }
+    }
+
+    steps
+}
+
+fn solve(input: &str, expansion: usize) -> usize {
+    let mut galaxies = Vec::<(usize, usize)>::new();
+    let mut grid: Vec<Vec<_>> = input
+        .lines()
+        .enumerate()
+        .map(|(y, line)| {
+            line.chars()
+                .enumerate()
+                .map(|(x, c)| {
+                    let has_galaxy = c == '#';
+
+                    if has_galaxy {
+                        galaxies.push((x, y));
+                    }
+
+                    GridPoint {
+                        galaxy: has_galaxy,
+                        vertical_expansion: false,
+                        horizontal_expansion: false,
+                    }
+                })
+                .collect()
+        })
+        .collect();
+
+    // The grid is square
+    let size = grid.len();
+
+    for row in &mut grid {
+        let has_galaxy = row.iter().any(|point| point.galaxy);
+
+        row.iter_mut()
+            .for_each(|point| point.vertical_expansion = !has_galaxy)
+    }
+
+    for x in 0..size {
+        let mut has_galaxy = false;
+        for row in &grid {
+            has_galaxy |= row[x].galaxy;
+        }
+
+        for row in &mut grid {
+            row[x].horizontal_expansion = !has_galaxy;
+        }
+    }
+
+    let mut sum = 0;
+    for a in &galaxies {
+        for b in &galaxies {
+            if a == b {
+                continue;
+            }
+
+            sum += distance(*a, *b, &grid, expansion);
+        }
+    }
+
+    // We are computing every pair twice, dividing by two is a simpler solution then keep keeping
+    // track of every pair, but it does require more computation
+    sum / 2
+}
+
+// -- Solution --
+pub struct Day;
+impl aoc::Solver for Day {
+    type Output1 = usize;
+    type Output2 = usize;
+
+    fn day() -> u8 {
+        11
+    }
+
+    fn part1(input: &str) -> Self::Output1 {
+        solve(input, 2)
+    }
+
+    fn part2(input: &str) -> Self::Output2 {
+        solve(input, 1000000)
+    }
+}