--- /dev/null
+pub struct Cube {
+ x: i32,
+ y: i32,
+ z: i32,
+}
+
+pub fn parse(input: &str) -> Vec<Cube> {
+ input
+ .lines()
+ .map(|l| {
+ let xyz: Vec<i32> = l
+ .trim()
+ .split(',')
+ .map(|v| str::parse(v).unwrap())
+ .collect();
+ Cube {
+ x: xyz[0],
+ y: xyz[1],
+ z: xyz[2],
+ }
+ })
+ .collect()
+}
+
+pub fn surface(cubes: &[Cube]) -> i32 {
+ let mut matrix: Vec<Vec<Vec<bool>>> = Vec::new();
+
+ for c in cubes {
+ for _ in matrix.len()..=c.x as usize {
+ matrix.push(Vec::new())
+ }
+ for _ in matrix[c.x as usize].len()..=c.y as usize {
+ matrix[c.x as usize].push(Vec::new())
+ }
+ for _ in matrix[c.x as usize][c.y as usize].len()..=c.z as usize {
+ matrix[c.x as usize][c.y as usize].push(false)
+ }
+ matrix[c.x as usize][c.y as usize][c.z as usize] = true;
+ }
+
+ let mut surface: i32 = 0;
+ for x in 0..matrix.len() as i32 {
+ for y in 0..matrix[x as usize].len() as i32 {
+ for z in 0..matrix[x as usize][y as usize].len() as i32 {
+ if matrix[x as usize][y as usize][z as usize] {
+ for (dx, dy, dz) in [
+ (1, 0, 0),
+ (-1, 0, 0),
+ (0, 1, 0),
+ (0, -1, 0),
+ (0, 0, 1),
+ (0, 0, -1),
+ ] {
+ let (x, y, z) = (x + dx, y + dy, z + dz);
+ if x < 0
+ || x >= matrix.len() as i32
+ || y < 0
+ || y >= matrix[x as usize].len() as i32
+ || z < 0
+ || z >= matrix[x as usize][y as usize].len() as i32
+ || !matrix[x as usize][y as usize][z as usize]
+ {
+ surface = surface + 1;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ surface
+}
+
+pub fn surface_without_trapped_air(cubes: &[Cube]) -> i32 {
+ 0 // TODO
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ static CUBES: &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() {
+ let cubes = parse(CUBES);
+ assert_eq!(surface(&cubes), 64);
+ }
+
+ #[test]
+ fn part2() {}
+}
day17::height(1_000_000_000_000, &movements)
)
}
+
+pub fn day18() -> String {
+ let cubes = day18::parse(&fs::read_to_string("data/day18.input").unwrap());
+ format!("part1: {}, part2: {}", day18::surface(&cubes), 0)
+}
projects / advent_of_code_2022.git / commitdiff