2022 day 18 part 1

2022/rust/src/main.rs

@@ -19,5 +19,6 @@ fn main() {
     // solutions::day14::run();
     // solutions::day15::run();
     // solutions::day16::run();
-    solutions::day17::run();
+    // solutions::day17::run();
+    solutions::day18::run();
 }

2022/rust/src/solutions/day18.rs

@@ -0,0 +1,74 @@
+use std::collections::HashSet;
+use crate::utils;
+
+
+pub fn run() -> () {
+    let data = parse_data(&utils::read_lines(utils::Source::Day(18)));
+
+    println!("Day 18");
+    println!("Part 1: {}", solve1(&data));
+    println!("Part 2: {}", solve2(&data));
+}
+
+
+type Point = (isize, isize, isize);
+
+
+fn solve1(data: &[Point]) -> i32 {
+    let points: HashSet<Point> = HashSet::from_iter(data.iter().copied());
+
+    let mut side_sum = 0;
+    for &(p_x, p_y, p_z) in data {
+        let sides = [
+            (p_x - 1, p_y, p_z), (p_x + 1, p_y, p_z),
+            (p_x, p_y - 1, p_z), (p_x, p_y + 1, p_z),
+            (p_x, p_y, p_z - 1), (p_x, p_y, p_z + 1),
+        ];
+
+        for side in sides {
+            if !points.contains(&side) {
+                side_sum += 1;
+            }
+        }
+    }
+    side_sum
+}
+
+fn solve2(data: &[Point]) -> i32 {
+    2
+}
+
+
+fn parse_data<T: AsRef<str>>(data: &[T]) -> Vec<Point> {
+    data.iter()
+        .map(|line| {
+            let mut coords = line.as_ref().split(",").into_iter();
+            (
+                coords.next().unwrap().parse().unwrap(),
+                coords.next().unwrap().parse().unwrap(),
+                coords.next().unwrap().parse().unwrap(),
+            )
+        })
+        .collect()
+}
+
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    static DATA: &[&str] = &[
+        "2,2,2", "1,2,2", "3,2,2", "2,1,2", "2,3,2", "2,2,1", "2,2,3",
+        "2,2,4", "2,2,6", "1,2,5", "3,2,5", "2,1,5", "2,3,5",
+    ];
+
+    #[test]
+    fn part1() {
+        assert_eq!(64, solve1(&parse_data(DATA)));
+    }
+
+    #[test]
+    fn part2() {
+        assert_eq!(2, solve2(&parse_data(DATA)));
+    }
+}

2022/rust/src/solutions/mod.rs

@@ -15,3 +15,4 @@ pub mod day14;
 pub mod day15;
 pub mod day16;
 pub mod day17;
+pub mod day18;