Day 14

2 files changed, 332 insertions, 0 deletions

diff --git a/2022/inputs/day_14.txt b/2022/inputs/day_14.txt
new file mode 100644
index 0000000..061ca66
--- /dev/null
+++ b/2022/inputs/day_14.txt
@@ -0,0 +1,148 @@
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diff --git a/2022/src/bin/day_14.rs b/2022/src/bin/day_14.rs
new file mode 100644
index 0000000..ec5b1cb
--- /dev/null
+++ b/2022/src/bin/day_14.rs
@@ -0,0 +1,184 @@
+use nom::{
+    bytes::complete::tag,
+    character::complete::{i32, line_ending},
+    combinator::map,
+    multi::separated_list1,
+    sequence::tuple,
+    IResult,
+};
+use std::{collections::BTreeSet, fs};
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let input = fs::read_to_string("inputs/day_14.txt")?;
+    let room = Room::parser(&input).unwrap().1;
+
+    {
+        let mut void_room = room.clone();
+        let mut room_is_full = false;
+        while !room_is_full {
+            let drop_result = void_room.drop_sand(true);
+            room_is_full = drop_result != DropSandResult::Settled;
+            if drop_result == DropSandResult::RoomFull {
+                return Err("The room filled up to the top!".into());
+            }
+        }
+        dbg!(void_room.sand.len());
+    }
+
+    {
+        let mut floor_room = room.clone();
+        let mut room_is_full = false;
+        while !room_is_full {
+            let drop_result = floor_room.drop_sand(false);
+            room_is_full = drop_result != DropSandResult::Settled;
+            if drop_result == DropSandResult::FellIntoTheVoid {
+                return Err("This room shouldn't have a void!".into());
+            }
+        }
+        dbg!(floor_room.sand.len());
+    }
+
+    Ok(())
+}
+
+#[derive(Debug, Clone)]
+struct Room {
+    walls: Vec<Wall>,
+    sand: BTreeSet<Point>,
+    sand_inlet: Point,
+    void_start_y: i32,
+}
+
+#[derive(Debug, Clone)]
+enum Wall {
+    Vertical(VerticalWall),
+    Horizontal(HorizontalWall),
+}
+
+#[derive(Debug, Clone)]
+struct VerticalWall {
+    x: i32,
+    y1: i32,
+    y2: i32,
+}
+
+#[derive(Debug, Clone)]
+struct HorizontalWall {
+    y: i32,
+    x1: i32,
+    x2: i32,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
+struct Point {
+    x: i32,
+    y: i32,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+enum DropSandResult {
+    FellIntoTheVoid,
+    Settled,
+    RoomFull,
+}
+
+impl Room {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        map(
+            separated_list1(line_ending, separated_list1(tag(" -> "), Point::parser)),
+            |wall_segments| {
+                let mut walls = Vec::new();
+                let mut void_start_y = 0;
+                for wall_segment in wall_segments {
+                    for point_pair in wall_segment.windows(2) {
+                        walls.push(if point_pair[0].x == point_pair[1].x {
+                            Wall::Vertical(VerticalWall {
+                                x: point_pair[0].x,
+                                y1: point_pair[0].y.min(point_pair[1].y),
+                                y2: point_pair[0].y.max(point_pair[1].y),
+                            })
+                        } else if point_pair[0].y == point_pair[1].y {
+                            Wall::Horizontal(HorizontalWall {
+                                y: point_pair[0].y,
+                                x1: point_pair[0].x.min(point_pair[1].x),
+                                x2: point_pair[0].x.max(point_pair[1].x),
+                            })
+                        } else {
+                            panic!("Invalid wall segment")
+                        });
+
+                        void_start_y = void_start_y.max(point_pair[0].y);
+                        void_start_y = void_start_y.max(point_pair[1].y);
+                    }
+
+                    void_start_y =
+                        void_start_y.max(wall_segment.iter().map(|p| p.y).max().unwrap_or(0))
+                }
+                Room {
+                    walls,
+                    sand: BTreeSet::new(),
+                    sand_inlet: Point { x: 500, y: 0 },
+                    void_start_y,
+                }
+            },
+        )(input)
+    }
+
+    fn point_is_occupied(&self, p: &Point) -> bool {
+        p.y >= self.void_start_y + 2
+            || self.sand.contains(p)
+            || self.walls.iter().any(|w| w.point_is_occupied(p))
+    }
+
+    fn point_is_in_the_void(&self, p: &Point) -> bool {
+        p.y >= self.void_start_y
+    }
+
+    fn drop_sand(&mut self, allow_infinite_void: bool) -> DropSandResult {
+        if self.point_is_occupied(&self.sand_inlet) {
+            return DropSandResult::RoomFull;
+        }
+
+        let mut falling_sand = self.sand_inlet.clone();
+        loop {
+            if allow_infinite_void && self.point_is_in_the_void(&falling_sand) {
+                return DropSandResult::FellIntoTheVoid;
+            } else if !self.point_is_occupied(&Point {
+                x: falling_sand.x,
+                y: falling_sand.y + 1,
+            }) {
+                falling_sand.y += 1;
+            } else if !self.point_is_occupied(&Point {
+                x: falling_sand.x - 1,
+                y: falling_sand.y + 1,
+            }) {
+                falling_sand.x -= 1;
+                falling_sand.y += 1;
+            } else if !self.point_is_occupied(&Point {
+                x: falling_sand.x + 1,
+                y: falling_sand.y + 1,
+            }) {
+                falling_sand.x += 1;
+                falling_sand.y += 1;
+            } else {
+                self.sand.insert(falling_sand);
+                return DropSandResult::Settled;
+            }
+        }
+    }
+}
+
+impl Wall {
+    fn point_is_occupied(&self, p: &Point) -> bool {
+        match self {
+            Wall::Vertical(VerticalWall { x, y1, y2 }) => p.x == *x && p.y >= *y1 && p.y <= *y2,
+            Wall::Horizontal(HorizontalWall { y, x1, x2 }) => p.y == *y && p.x >= *x1 && p.x <= *x2,
+        }
+    }
+}
+
+impl Point {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        map(tuple((i32, tag(","), i32)), |(x, _, y)| Point { x, y })(input)
+    }
+}