Implement 2022 day 14 part 2

2022/inputs/14.txt

@@ -0,0 +1,147 @@
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+541,165 -> 541,166 -> 551,166 -> 551,165
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+565,161 -> 569,161
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+531,95 -> 536,95
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+527,92 -> 532,92
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+499,13 -> 499,15 -> 495,15 -> 495,22 -> 506,22 -> 506,15 -> 501,15 -> 501,13
+492,65 -> 492,64 -> 492,65 -> 494,65 -> 494,59 -> 494,65 -> 496,65 -> 496,64 -> 496,65 -> 498,65 -> 498,62 -> 498,65 -> 500,65 -> 500,63 -> 500,65 -> 502,65 -> 502,59 -> 502,65 -> 504,65 -> 504,64 -> 504,65 -> 506,65 -> 506,63 -> 506,65 -> 508,65 -> 508,63 -> 508,65
+541,149 -> 541,141 -> 541,149 -> 543,149 -> 543,144 -> 543,149 -> 545,149 -> 545,144 -> 545,149 -> 547,149 -> 547,148 -> 547,149 -> 549,149 -> 549,144 -> 549,149 -> 551,149 -> 551,141 -> 551,149 -> 553,149 -> 553,147 -> 553,149 -> 555,149 -> 555,146 -> 555,149 -> 557,149 -> 557,147 -> 557,149
+527,102 -> 527,106 -> 523,106 -> 523,111 -> 540,111 -> 540,106 -> 533,106 -> 533,102
+490,35 -> 490,31 -> 490,35 -> 492,35 -> 492,31 -> 492,35 -> 494,35 -> 494,29 -> 494,35 -> 496,35 -> 496,26 -> 496,35
+492,65 -> 492,64 -> 492,65 -> 494,65 -> 494,59 -> 494,65 -> 496,65 -> 496,64 -> 496,65 -> 498,65 -> 498,62 -> 498,65 -> 500,65 -> 500,63 -> 500,65 -> 502,65 -> 502,59 -> 502,65 -> 504,65 -> 504,64 -> 504,65 -> 506,65 -> 506,63 -> 506,65 -> 508,65 -> 508,63 -> 508,65
+560,133 -> 564,133
+506,68 -> 506,70 -> 502,70 -> 502,77 -> 513,77 -> 513,70 -> 512,70 -> 512,68
+538,114 -> 538,116 -> 536,116 -> 536,122 -> 552,122 -> 552,116 -> 544,116 -> 544,114
+524,95 -> 529,95
+492,65 -> 492,64 -> 492,65 -> 494,65 -> 494,59 -> 494,65 -> 496,65 -> 496,64 -> 496,65 -> 498,65 -> 498,62 -> 498,65 -> 500,65 -> 500,63 -> 500,65 -> 502,65 -> 502,59 -> 502,65 -> 504,65 -> 504,64 -> 504,65 -> 506,65 -> 506,63 -> 506,65 -> 508,65 -> 508,63 -> 508,65

2022/src/common.rs

@@ -134,7 +134,7 @@ pub fn get_both<T>(slice: &mut [T], first: usize, second: usize) -> (&mut T, &mu
     }
 }
 
-#[derive(Default)]
+#[derive(Debug, Default)]
 pub struct IndexSet(Vec<u32>);
 
 impl IndexSet {

2022/src/day14.rs

@@ -1,9 +1,155 @@
 use anyhow::Result;
+use nom::branch::alt;
+use nom::bytes::complete::tag;
+use nom::character::complete::newline;
+use nom::combinator::map_res;
+use nom::combinator::opt;
+use nom::sequence::separated_pair;
+use nom::sequence::terminated;
+use nom::IResult;
 
-pub fn part1(_input: &[u8]) -> Result<String> {
+use crate::common::parse_input;
-    anyhow::bail!("not implemented")
+use crate::common::reduce_many1;
+use crate::common::IndexSet;
+
+#[derive(Debug)]
+struct Cave {
+    width: usize,
+    height: usize,
+    occupied: IndexSet,
+    floor: usize,
 }
 
-pub fn part2(_input: &[u8]) -> Result<String> {
+impl Cave {
-    anyhow::bail!("not implemented")
+    pub fn insert(&mut self, x: usize, y: usize) -> bool {
+        // Note: we're indexing column major for better cache locality
+        self.occupied.insert(self.floor * x + y)
+    }
+
+    pub fn drop(&mut self, x: usize, y: usize, total: &mut usize) -> bool {
+        if x >= self.width || y >= self.height {
+            return false;
+        } else if !self.insert(x, y) {
+            return true;
+        }
+
+        // x + usize::MAX is used to compute x - 1 because usize - isize doesn't exist in stable yet.
+        let supported = [0, usize::MAX, 1]
+            .into_iter()
+            .all(|dx| self.drop(x.wrapping_add(dx), y + 1, total));
+
+        if supported {
+            *total += 1;
+        }
+
+        supported
+    }
+
+    fn drop2(&mut self, x: usize, y: usize, total: &mut usize) {
+        if y >= self.floor || !self.insert(x, y) {
+            return;
+        }
+
+        *total += 1;
+
+        for dx in [0, usize::MAX, 1] {
+            self.drop2(x.wrapping_add(dx), y + 1, total);
+        }
+    }
+}
+
+fn parse_pair(input: &[u8]) -> IResult<&[u8], (usize, usize)> {
+    fn parse_usize(input: &[u8]) -> IResult<&[u8], usize> {
+        map_res(nom::character::complete::u32, usize::try_from)(input)
+    }
+
+    separated_pair(parse_usize, tag(","), parse_usize)(input)
+}
+
+fn find_dimensions(input: &[u8]) -> IResult<&[u8], (usize, usize)> {
+    reduce_many1(
+        terminated(parse_pair, alt((tag(" -> "), tag("\n")))), // Somehow this cant be `newline` because type deduction goes awry
+        |(width, height), (x, y)| (width.max(x + 1), height.max(y + 1)),
+    )(input)
+}
+
+fn parse_cave(input: &[u8]) -> IResult<&[u8], Cave> {
+    let (width, height) = find_dimensions(input)?.1;
+
+    let floor = height + 1;
+
+    // Assume parsing went somewhat right
+    debug_assert_ne!(width, 0);
+    debug_assert_ne!(height, 0);
+
+    let mut cave = Cave {
+        width,
+        height,
+        occupied: IndexSet::with_capacity(width * floor),
+        floor,
+    };
+
+    let mut input = input;
+
+    while input != &[][..] {
+        let new_input = terminated(
+            reduce_many1(
+                terminated(parse_pair, opt(tag(" -> "))),
+                |(x_old, y_old), (x_prime, y_prime)| {
+                    if x_prime == x_old {
+                        for y in (y_old.min(y_prime))..=(y_old.max(y_prime)) {
+                            cave.insert(x_old, y);
+                        }
+                    } else {
+                        for x in (x_old.min(x_prime))..=(x_old.max(x_prime)) {
+                            cave.insert(x, y_old);
+                        }
+                    }
+                    (x_prime, y_prime)
+                },
+            ),
+            newline,
+        )(input)?
+        .0;
+
+        input = new_input;
+    }
+
+    Ok((input, cave))
+}
+
+pub fn part1(input: &[u8]) -> Result<String> {
+    let mut cave = parse_input(input, parse_cave)?;
+
+    let mut total = 0;
+
+    cave.drop(500, 0, &mut total);
+
+    Ok(total.to_string())
+}
+
+pub fn part2(input: &[u8]) -> Result<String> {
+    let mut cave = parse_input(input, parse_cave)?;
+
+    let mut total = 0;
+    cave.drop2(500, 0, &mut total);
+
+    Ok(total.to_string())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const SAMPLE: &[u8] = include_bytes!("samples/14.txt");
+
+    #[test]
+    fn sample_part1() {
+        assert_eq!(part1(SAMPLE).unwrap(), "24");
+    }
+
+    #[test]
+    fn sample_part2() {
+        assert_eq!(part2(SAMPLE).unwrap(), "93")
+    }
 }

2022/src/samples/14.txt

@@ -0,0 +1,2 @@
+498,4 -> 498,6 -> 496,6
+503,4 -> 502,4 -> 502,9 -> 494,9