2022 day14/rust: cleanup

2022/data/day14.expected

@@ -0,0 +1,2 @@
+610
+27194

2022/data/day14.input

@@ -0,0 +1,123 @@
+512,122 -> 512,118 -> 512,122 -> 514,122 -> 514,120 -> 514,122 -> 516,122 -> 516,121 -> 516,122
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+516,125 -> 516,129 -> 515,129 -> 515,136 -> 526,136 -> 526,129 -> 519,129 -> 519,125
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+512,122 -> 512,118 -> 512,122 -> 514,122 -> 514,120 -> 514,122 -> 516,122 -> 516,121 -> 516,122
+511,86 -> 515,86
+485,22 -> 489,22
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+509,150 -> 513,150
+516,65 -> 516,69 -> 508,69 -> 508,74 -> 521,74 -> 521,69 -> 520,69 -> 520,65
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+494,157 -> 494,159 -> 491,159 -> 491,167 -> 503,167 -> 503,159 -> 499,159 -> 499,157
+494,157 -> 494,159 -> 491,159 -> 491,167 -> 503,167 -> 503,159 -> 499,159 -> 499,157
+512,139 -> 512,142 -> 509,142 -> 509,145 -> 521,145 -> 521,142 -> 517,142 -> 517,139
+512,139 -> 512,142 -> 509,142 -> 509,145 -> 521,145 -> 521,142 -> 517,142 -> 517,139
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+494,24 -> 498,24
+516,65 -> 516,69 -> 508,69 -> 508,74 -> 521,74 -> 521,69 -> 520,69 -> 520,65
+494,157 -> 494,159 -> 491,159 -> 491,167 -> 503,167 -> 503,159 -> 499,159 -> 499,157
+497,154 -> 501,154
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+523,80 -> 527,80
+512,139 -> 512,142 -> 509,142 -> 509,145 -> 521,145 -> 521,142 -> 517,142 -> 517,139
+505,17 -> 510,17
+510,104 -> 510,96 -> 510,104 -> 512,104 -> 512,101 -> 512,104 -> 514,104 -> 514,100 -> 514,104 -> 516,104 -> 516,103 -> 516,104
+498,17 -> 503,17
+512,122 -> 512,118 -> 512,122 -> 514,122 -> 514,120 -> 514,122 -> 516,122 -> 516,121 -> 516,122
+512,139 -> 512,142 -> 509,142 -> 509,145 -> 521,145 -> 521,142 -> 517,142 -> 517,139
+494,157 -> 494,159 -> 491,159 -> 491,167 -> 503,167 -> 503,159 -> 499,159 -> 499,157
+516,125 -> 516,129 -> 515,129 -> 515,136 -> 526,136 -> 526,129 -> 519,129 -> 519,125
+510,104 -> 510,96 -> 510,104 -> 512,104 -> 512,101 -> 512,104 -> 514,104 -> 514,100 -> 514,104 -> 516,104 -> 516,103 -> 516,104
+516,125 -> 516,129 -> 515,129 -> 515,136 -> 526,136 -> 526,129 -> 519,129 -> 519,125
+509,31 -> 509,32 -> 513,32 -> 513,31
+504,90 -> 504,91 -> 513,91 -> 513,90
+493,48 -> 493,49 -> 512,49 -> 512,48
+479,26 -> 483,26
+488,24 -> 492,24
+512,152 -> 516,152
+491,26 -> 495,26
+493,48 -> 493,49 -> 512,49 -> 512,48
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+512,122 -> 512,118 -> 512,122 -> 514,122 -> 514,120 -> 514,122 -> 516,122 -> 516,121 -> 516,122
+517,80 -> 521,80
+510,104 -> 510,96 -> 510,104 -> 512,104 -> 512,101 -> 512,104 -> 514,104 -> 514,100 -> 514,104 -> 516,104 -> 516,103 -> 516,104
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+494,157 -> 494,159 -> 491,159 -> 491,167 -> 503,167 -> 503,159 -> 499,159 -> 499,157
+514,83 -> 518,83
+510,104 -> 510,96 -> 510,104 -> 512,104 -> 512,101 -> 512,104 -> 514,104 -> 514,100 -> 514,104 -> 516,104 -> 516,103 -> 516,104
+510,104 -> 510,96 -> 510,104 -> 512,104 -> 512,101 -> 512,104 -> 514,104 -> 514,100 -> 514,104 -> 516,104 -> 516,103 -> 516,104
+529,86 -> 533,86
+526,83 -> 530,83
+497,13 -> 502,13
+516,108 -> 516,109 -> 520,109 -> 520,108
+512,139 -> 512,142 -> 509,142 -> 509,145 -> 521,145 -> 521,142 -> 517,142 -> 517,139
+516,125 -> 516,129 -> 515,129 -> 515,136 -> 526,136 -> 526,129 -> 519,129 -> 519,125
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+503,154 -> 507,154
+494,15 -> 499,15
+520,77 -> 524,77
+506,152 -> 510,152
+516,65 -> 516,69 -> 508,69 -> 508,74 -> 521,74 -> 521,69 -> 520,69 -> 520,65
+516,65 -> 516,69 -> 508,69 -> 508,74 -> 521,74 -> 521,69 -> 520,69 -> 520,65
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+494,157 -> 494,159 -> 491,159 -> 491,167 -> 503,167 -> 503,159 -> 499,159 -> 499,157
+512,139 -> 512,142 -> 509,142 -> 509,145 -> 521,145 -> 521,142 -> 517,142 -> 517,139
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+493,48 -> 493,49 -> 512,49 -> 512,48
+510,104 -> 510,96 -> 510,104 -> 512,104 -> 512,101 -> 512,104 -> 514,104 -> 514,100 -> 514,104 -> 516,104 -> 516,103 -> 516,104
+516,108 -> 516,109 -> 520,109 -> 520,108
+512,122 -> 512,118 -> 512,122 -> 514,122 -> 514,120 -> 514,122 -> 516,122 -> 516,121 -> 516,122
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+488,20 -> 492,20
+500,152 -> 504,152
+509,31 -> 509,32 -> 513,32 -> 513,31
+509,154 -> 513,154
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+516,125 -> 516,129 -> 515,129 -> 515,136 -> 526,136 -> 526,129 -> 519,129 -> 519,125
+523,86 -> 527,86
+516,125 -> 516,129 -> 515,129 -> 515,136 -> 526,136 -> 526,129 -> 519,129 -> 519,125
+491,22 -> 495,22
+497,26 -> 501,26
+506,148 -> 510,148
+516,65 -> 516,69 -> 508,69 -> 508,74 -> 521,74 -> 521,69 -> 520,69 -> 520,65
+512,122 -> 512,118 -> 512,122 -> 514,122 -> 514,120 -> 514,122 -> 516,122 -> 516,121 -> 516,122
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+510,104 -> 510,96 -> 510,104 -> 512,104 -> 512,101 -> 512,104 -> 514,104 -> 514,100 -> 514,104 -> 516,104 -> 516,103 -> 516,104
+510,104 -> 510,96 -> 510,104 -> 512,104 -> 512,101 -> 512,104 -> 514,104 -> 514,100 -> 514,104 -> 516,104 -> 516,103 -> 516,104
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+494,157 -> 494,159 -> 491,159 -> 491,167 -> 503,167 -> 503,159 -> 499,159 -> 499,157
+516,108 -> 516,109 -> 520,109 -> 520,108
+501,15 -> 506,15
+516,125 -> 516,129 -> 515,129 -> 515,136 -> 526,136 -> 526,129 -> 519,129 -> 519,125
+491,17 -> 496,17
+516,65 -> 516,69 -> 508,69 -> 508,74 -> 521,74 -> 521,69 -> 520,69 -> 520,65
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+512,122 -> 512,118 -> 512,122 -> 514,122 -> 514,120 -> 514,122 -> 516,122 -> 516,121 -> 516,122
+512,139 -> 512,142 -> 509,142 -> 509,145 -> 521,145 -> 521,142 -> 517,142 -> 517,139
+504,90 -> 504,91 -> 513,91 -> 513,90
+503,45 -> 503,41 -> 503,45 -> 505,45 -> 505,43 -> 505,45 -> 507,45 -> 507,37 -> 507,45 -> 509,45 -> 509,35 -> 509,45 -> 511,45 -> 511,37 -> 511,45
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62
+482,24 -> 486,24
+510,104 -> 510,96 -> 510,104 -> 512,104 -> 512,101 -> 512,104 -> 514,104 -> 514,100 -> 514,104 -> 516,104 -> 516,103 -> 516,104
+509,31 -> 509,32 -> 513,32 -> 513,31
+516,65 -> 516,69 -> 508,69 -> 508,74 -> 521,74 -> 521,69 -> 520,69 -> 520,65
+512,122 -> 512,118 -> 512,122 -> 514,122 -> 514,120 -> 514,122 -> 516,122 -> 516,121 -> 516,122
+515,154 -> 519,154
+517,86 -> 521,86
+485,26 -> 489,26
+504,90 -> 504,91 -> 513,91 -> 513,90
+510,104 -> 510,96 -> 510,104 -> 512,104 -> 512,101 -> 512,104 -> 514,104 -> 514,100 -> 514,104 -> 516,104 -> 516,103 -> 516,104
+510,104 -> 510,96 -> 510,104 -> 512,104 -> 512,101 -> 512,104 -> 514,104 -> 514,100 -> 514,104 -> 516,104 -> 516,103 -> 516,104
+503,150 -> 507,150
+520,83 -> 524,83
+508,62 -> 508,56 -> 508,62 -> 510,62 -> 510,52 -> 510,62 -> 512,62 -> 512,60 -> 512,62 -> 514,62 -> 514,58 -> 514,62 -> 516,62 -> 516,55 -> 516,62

2022/day14/rust/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "rust_2022_14"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+aoc = { path = "../../../common/rust" }
+itertools = "0.10.5"

2022/day14/rust/src/main.rs

@@ -0,0 +1,80 @@
+#![warn(clippy::pedantic)]
+
+use std::{collections::HashSet, io::stdin};
+
+use aoc::vec2::{Line, Vec2};
+use itertools::Itertools;
+
+fn parse_points(s: &str) -> impl Iterator<Item = Vec2> + '_ {
+    s.split(" -> ").map(|p| {
+        let (x, y) = p.split_once(',').unwrap();
+        let x = x.parse().unwrap();
+        let y = y.parse().unwrap();
+        (x, y).into()
+    })
+}
+
+fn simulate(structures: HashSet<Vec2>, floor: Option<usize>) -> usize {
+    let mut points = structures;
+    let lowest = points.iter().map(|v| v.y).max().unwrap();
+    let start = Vec2::new(500, 0);
+
+    let mut pieces = 0;
+    'pieces: loop {
+        let mut pos = start;
+        'fall: loop {
+            let new_pos = [(0, 1), (-1, 1), (1, 1)]
+                .into_iter()
+                .map(|direction| pos + direction.into())
+                .find(|pos| !points.contains(pos));
+
+            if let Some(new_pos) = new_pos {
+                pos = new_pos;
+
+                match floor {
+                    Some(offset) => {
+                        if pos.y >= lowest + i32::try_from(offset).unwrap() - 1 {
+                            // landed on the floor
+                            break 'fall;
+                        }
+                    }
+                    None => {
+                        if pos.y >= lowest {
+                            // fell into the void
+                            break 'pieces;
+                        }
+                    }
+                }
+            } else {
+                // stuck
+                break 'fall;
+            }
+        }
+
+        points.insert(pos);
+        pieces += 1;
+
+        if pos == start {
+            // all filled up
+            break 'pieces;
+        }
+    }
+
+    pieces
+}
+
+fn main() {
+    let points: HashSet<Vec2> = stdin()
+        .lines()
+        .flat_map(|line| {
+            parse_points(&line.unwrap())
+                .tuple_windows()
+                .map(|(start, end)| Line { start, end })
+                .collect::<Vec<_>>()
+        })
+        .flat_map(|line| line.points().unwrap())
+        .collect();
+
+    println!("{}", simulate(points.clone(), None));
+    println!("{}", simulate(points, Some(2)));
+}

Cargo.lock

@@ -593,6 +593,14 @@ dependencies = [
  "nom",
 ]
 
+[[package]]
+name = "rust_2022_14"
+version = "0.1.0"
+dependencies = [
+ "aoc",
+ "itertools",
+]
+
 [[package]]
 name = "ryu"
 version = "1.0.11"

Cargo.toml

@@ -23,4 +23,5 @@ members = [
 	"2022/day11/rust",
 	"2022/day12/rust",
 	"2022/day13/rust",
+	"2022/day14/rust",
 ]

common/rust/src/vec2.rs

@@ -6,8 +6,8 @@ use std::{
 
 #[derive(Debug, Default, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct Vec2 {
-    x: i32, // increases toward right
+    pub x: i32, // increases toward right
-    y: i32, // increases toward top
+    pub y: i32, // increases toward top
 }
 
 impl Vec2 {
@@ -140,3 +140,57 @@ impl FromStr for Direction {
         }
     }
 }
+
+/// A line from one point to another.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct Line {
+    pub start: Vec2,
+    pub end: Vec2,
+}
+
+impl Line {
+    /// Returns an iterator over the line's points represented as [`Vec2`], including the start and
+    /// end points.
+    ///
+    /// Only works for orthogonal lines.
+    #[must_use]
+    pub fn points(self) -> Option<LinePoints> {
+        LinePoints::try_from(self).ok()
+    }
+}
+
+/// An iterator over a line's points. See [`Line::points()`] for details.
+pub struct LinePoints {
+    line: Option<Line>,
+}
+
+impl TryFrom<Line> for LinePoints {
+    type Error = ();
+
+    fn try_from(line: Line) -> Result<Self, Self::Error> {
+        if line.start.x == line.end.x || line.start.y == line.end.y {
+            Ok(Self { line: Some(line) })
+        } else {
+            Err(())
+        }
+    }
+}
+
+impl Iterator for LinePoints {
+    type Item = Vec2;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let Some(line) = self.line.as_mut() else { return None };
+
+        let delta = (line.end - line.start).map(i32::signum);
+
+        let p = line.start;
+        line.start += delta;
+
+        if delta == Vec2::new(0, 0) {
+            self.line = None;
+        }
+
+        Some(p)
+    }
+}