From bde069f91262dbe45c68cc903a4fe590dfcbc93b Mon Sep 17 00:00:00 2001
From: HoLLy <dario.db@hotmail.com>
Date: Wed, 22 Dec 2021 16:07:07 +0100
Subject: [PATCH] Solve day 22

---
 Cargo.lock              |  10 +-
 Cargo.toml              |   1 +
 day-21/Cargo.toml       |   1 -
 day-22/Cargo.toml       |  17 ++
 day-22/benches/bench.rs |  42 ++++
 day-22/input.txt        | 420 ++++++++++++++++++++++++++++++++++++++++
 day-22/sample.txt       |  60 ++++++
 day-22/src/main.rs      | 328 +++++++++++++++++++++++++++++++
 8 files changed, 877 insertions(+), 2 deletions(-)
 create mode 100644 day-22/Cargo.toml
 create mode 100644 day-22/benches/bench.rs
 create mode 100644 day-22/input.txt
 create mode 100644 day-22/sample.txt
 create mode 100644 day-22/src/main.rs

diff --git a/Cargo.lock b/Cargo.lock
index 97ff398..554553c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -378,7 +378,15 @@ version = "0.1.0"
 dependencies = [
  "aoc-lib",
  "criterion",
- "either",
+]
+
+[[package]]
+name = "day-22"
+version = "0.1.0"
+dependencies = [
+ "aoc-lib",
+ "criterion",
+ "tinyvec",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 5842a0f..02db9b0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,4 +22,5 @@ members = [
     "day-19",
     "day-20",
     "day-21",
+    "day-22",
 ]
diff --git a/day-21/Cargo.toml b/day-21/Cargo.toml
index d42110c..4efc4d9 100644
--- a/day-21/Cargo.toml
+++ b/day-21/Cargo.toml
@@ -7,7 +7,6 @@ edition = "2021"
 
 [dependencies]
 aoc-lib = { path = "../aoc-lib" }
-either = "1.6.1"
 
 [dev-dependencies]
 criterion = "0.3"
diff --git a/day-22/Cargo.toml b/day-22/Cargo.toml
new file mode 100644
index 0000000..ef62cff
--- /dev/null
+++ b/day-22/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "day-22"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+aoc-lib = { path = "../aoc-lib" }
+tinyvec = { version = "1.5.1", features = ["rustc_1_55", "alloc"] }
+
+[dev-dependencies]
+criterion = "0.3"
+
+[[bench]]
+name = "bench"
+harness = false
diff --git a/day-22/benches/bench.rs b/day-22/benches/bench.rs
new file mode 100644
index 0000000..2b3f174
--- /dev/null
+++ b/day-22/benches/bench.rs
@@ -0,0 +1,42 @@
+#![allow(dead_code)]
+
+use aoc_lib::AdventOfCode;
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+#[path = "../src/main.rs"]
+mod main;
+
+fn bench_main(c: &mut Criterion) {
+    c.bench_function("parse input", |b| {
+        let input = include_str!("../input.txt");
+        b.iter(|| main::Day22::parse_input(black_box(input)))
+    });
+
+    c.bench_function("solve 1", |b| {
+        let input = main::Day22::parse_input(include_str!("../input.txt"));
+        b.iter(|| main::Day22::solve_1(black_box(&input)))
+    });
+
+    c.bench_function("solve 2", |b| {
+        let input = main::Day22::parse_input(include_str!("../input.txt"));
+        b.iter(|| main::Day22::solve_2(black_box(&input)))
+    });
+
+    c.bench_function("parse sample input", |b| {
+        let input = include_str!("../sample.txt");
+        b.iter(|| main::Day22::parse_input(black_box(input)))
+    });
+
+    c.bench_function("solve 1 (sample input)", |b| {
+        let input = main::Day22::parse_input(include_str!("../sample.txt"));
+        b.iter(|| main::Day22::solve_1(black_box(&input)))
+    });
+
+    c.bench_function("solve 2 (sample input)", |b| {
+        let input = main::Day22::parse_input(include_str!("../sample.txt"));
+        b.iter(|| main::Day22::solve_2(black_box(&input)))
+    });
+}
+
+criterion_group!(benches, bench_main);
+criterion_main!(benches);
diff --git a/day-22/input.txt b/day-22/input.txt
new file mode 100644
index 0000000..f879914
--- /dev/null
+++ b/day-22/input.txt
@@ -0,0 +1,420 @@
+on x=-22..32,y=-14..30,z=-17..31
+on x=-4..46,y=-21..23,z=-37..8
+on x=-49..0,y=-27..19,z=-11..42
+on x=-31..15,y=-5..46,z=-44..8
+on x=-13..38,y=-42..6,z=-48..6
+on x=-31..19,y=-13..31,z=-33..21
+on x=-42..2,y=-46..-2,z=-38..16
+on x=-39..5,y=-11..36,z=-24..24
+on x=-28..23,y=-26..24,z=-42..11
+on x=-26..27,y=-16..34,z=-13..36
+off x=-10..-1,y=22..35,z=0..13
+on x=-33..17,y=-35..19,z=-15..35
+off x=5..20,y=28..40,z=-19..-6
+on x=-33..11,y=-3..46,z=-24..21
+off x=19..28,y=36..49,z=-30..-19
+on x=-19..33,y=-21..32,z=-6..39
+off x=-9..7,y=-30..-21,z=-31..-14
+on x=-12..40,y=-14..38,z=-19..30
+off x=-22..-12,y=-48..-33,z=25..37
+on x=-28..18,y=-23..24,z=-14..37
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+off x=60896..72927,y=35024..55913,z=-32775..-16911
+off x=-64864..-42920,y=-17407..-54,z=-72066..-44353
+on x=-46157..-27456,y=57262..78720,z=-20145..4131
+off x=43849..77466,y=-58778..-43963,z=-14159..10415
+on x=-23828..-16150,y=-87866..-75490,z=11407..16939
+off x=12164..33665,y=-6400..10238,z=-87979..-63401
+on x=23615..55833,y=7453..18457,z=-85920..-57350
+on x=-40675..-26911,y=48362..56763,z=-54066..-43705
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+on x=49207..81951,y=-24926..-9957,z=-42240..-41508
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+on x=-60626..-45750,y=45993..59627,z=7283..31969
+on x=-54424..-37511,y=-73156..-68044,z=617..20695
+off x=61577..83239,y=-30533..4182,z=19445..39734
+off x=-44142..-36940,y=-18137..-11026,z=57620..87726
+on x=39838..60496,y=-62187..-29792,z=26209..36906
+on x=5260..33769,y=73133..86434,z=-24525..-11423
+on x=-36986..-20984,y=69578..79995,z=-18380..9919
+on x=-4107..12679,y=-36148..-8537,z=-77473..-70965
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+on x=-7488..3867,y=-79234..-59075,z=38258..57402
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+on x=385..27692,y=3728..33216,z=67955..84805
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+off x=55423..69667,y=35605..61318,z=-37529..-9051
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+off x=27110..48238,y=20429..33447,z=-69513..-56847
+off x=-70408..-53349,y=-55870..-28425,z=13136..40077
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+off x=-761..17563,y=64663..80718,z=15966..41641
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+on x=42574..61455,y=-66165..-41420,z=1108..10164
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+off x=23966..41695,y=-76794..-66939,z=-38633..-19803
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+on x=-86928..-64851,y=-16250..928,z=-55822..-28505
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+off x=63936..88315,y=-23152..-16516,z=4477..23650
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+off x=-11454..-5139,y=63917..92333,z=3879..12251
\ No newline at end of file
diff --git a/day-22/sample.txt b/day-22/sample.txt
new file mode 100644
index 0000000..2790bed
--- /dev/null
+++ b/day-22/sample.txt
@@ -0,0 +1,60 @@
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+on x=-44..5,y=-27..21,z=-14..35
+on x=-49..-1,y=-11..42,z=-10..38
+on x=-20..34,y=-40..6,z=-44..1
+off x=26..39,y=40..50,z=-2..11
+on x=-41..5,y=-41..6,z=-36..8
+off x=-43..-33,y=-45..-28,z=7..25
+on x=-33..15,y=-32..19,z=-34..11
+off x=35..47,y=-46..-34,z=-11..5
+on x=-14..36,y=-6..44,z=-16..29
+on x=-57795..-6158,y=29564..72030,z=20435..90618
+on x=36731..105352,y=-21140..28532,z=16094..90401
+on x=30999..107136,y=-53464..15513,z=8553..71215
+on x=13528..83982,y=-99403..-27377,z=-24141..23996
+on x=-72682..-12347,y=18159..111354,z=7391..80950
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+off x=-101086..-9439,y=-7088..67543,z=33935..83858
+off x=18020..114017,y=-48931..32606,z=21474..89843
+off x=-77139..10506,y=-89994..-18797,z=-80..59318
+off x=8476..79288,y=-75520..11602,z=-96624..-24783
+on x=-47488..-1262,y=24338..100707,z=16292..72967
+off x=-84341..13987,y=2429..92914,z=-90671..-1318
+off x=-37810..49457,y=-71013..-7894,z=-105357..-13188
+off x=-27365..46395,y=31009..98017,z=15428..76570
+off x=-70369..-16548,y=22648..78696,z=-1892..86821
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\ No newline at end of file
diff --git a/day-22/src/main.rs b/day-22/src/main.rs
new file mode 100644
index 0000000..e279ec8
--- /dev/null
+++ b/day-22/src/main.rs
@@ -0,0 +1,328 @@
+use aoc_lib::*;
+use tinyvec::{array_vec, ArrayVec, TinyVec};
+
+aoc_setup!(Day22, sample 1: 474140, sample 2: 2758514936282235, part 1: 568000);
+
+#[derive(Debug, Clone, Copy)]
+pub struct Instruction {
+    state: bool,
+    region: Region3D,
+}
+
+impl Instruction {
+    pub fn parse(line: &str) -> Self {
+        let (state, line) = line.split_once(' ').unwrap();
+
+        Self {
+            state: state.len() == 2,
+            region: Region3D::parse(line),
+        }
+    }
+}
+
+#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
+pub struct Region3D {
+    range_x: Region1D,
+    range_y: Region1D,
+    range_z: Region1D,
+}
+
+impl Region3D {
+    pub fn parse(text: &str) -> Self {
+        let mut parts = text.split(',');
+        Self {
+            range_x: Region1D::parse(&(parts.next().unwrap()[2..])),
+            range_y: Region1D::parse(&(parts.next().unwrap()[2..])),
+            range_z: Region1D::parse(&(parts.next().unwrap()[2..])),
+        }
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.range_x.is_empty() || self.range_y.is_empty() || self.range_z.is_empty()
+    }
+
+    #[must_use]
+    pub fn clamp_to_init(self) -> Self {
+        Self {
+            range_x: self.range_x.clamp_to_init(),
+            range_y: self.range_y.clamp_to_init(),
+            range_z: self.range_z.clamp_to_init(),
+        }
+    }
+
+    // can return up to 3^3 values, if split in the center
+    // for performance reasons, only store up to 4 items on the stack (common case)
+    // this can be increased to 27 if needed
+    pub fn split_excluding_self(self, other: &Self) -> TinyVec<[Self; 9]> {
+        self.range_x
+            .split(&other.range_x) // split x range
+            .into_iter()
+            .map(|new_region_x| Self {
+                range_x: new_region_x,
+                ..self
+            }) // turn split x ranges into
+            .flat_map(|x_chunk| {
+                self.range_y
+                    .split(&other.range_y)
+                    .into_iter()
+                    .map(move |new_region_y| Self {
+                        range_y: new_region_y,
+                        ..x_chunk
+                    })
+                    .flat_map(|y_chunk| {
+                        self.range_z
+                            .split(&other.range_z)
+                            .into_iter()
+                            .map(move |new_region_z| Self {
+                                range_z: new_region_z,
+                                ..y_chunk
+                            })
+                    })
+            })
+            .filter(|region| !region.fits_inside(other))
+            .collect()
+    }
+
+    pub fn fits_inside(&self, other: &Self) -> bool {
+        let ret = self.range_x.fits_inside(&other.range_x)
+            && self.range_y.fits_inside(&other.range_y)
+            && self.range_z.fits_inside(&other.range_z);
+        ret
+    }
+
+    pub fn intersects(&self, other: &Self) -> bool {
+        self.range_x.intersects(&other.range_x)
+            && self.range_y.intersects(&other.range_y)
+            && self.range_z.intersects(&other.range_z)
+    }
+
+    pub fn size(&self) -> usize {
+        self.range_x.size() * self.range_y.size() * self.range_z.size()
+    }
+}
+
+#[derive(Default, Clone, Copy, PartialEq, Eq)]
+pub struct Region1D(isize, isize);
+
+impl Region1D {
+    pub fn parse(text: &str) -> Self {
+        let (a, b) = text.split_once("..").unwrap();
+        let pair: (isize, isize) = (a.parse().unwrap(), b.parse().unwrap());
+        Self(pair.0.min(pair.1), pair.0.max(pair.1))
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.0 > self.1
+    }
+
+    #[must_use]
+    pub fn clamp_to_init(self) -> Self {
+        Self(self.0.max(-50), self.1.min(50))
+    }
+
+    /// Splits the Region1D into pieces. One of the regions will perfectly cover the other region.
+    // TODO: rewrite to be cleaner using inclusiverange::contains?
+    pub fn split(self, other: &Self) -> ArrayVec<[Self; 3]> {
+        if other.1 < self.0 || other.0 > self.1 {
+            // other is definitely outside
+            array_vec![[Self; 3] => self]
+        } else if other.0 <= self.0 && other.1 >= self.1 {
+            // other completely covers us (ie. we are contained in them)
+            array_vec![[Self; 3] => self]
+        } else if other.0 >= self.0 && other.1 <= self.1 {
+            // other is definitely inside
+            array_vec![[Self; 3] => Self(self.0, other.0 - 1), *other, Self(other.1 + 1, self.1)]
+        } else {
+            // other partially overlaps, covering one of our edges
+            if other.0 < self.0 {
+                // other covers left edge
+                array_vec![[Self; 3] => Self(self.0, other.1), Self(other.1 + 1, self.1)]
+            } else {
+                // other covers right edge
+                array_vec![[Self; 3] => Self(self.0, other.0 - 1), Self(other.0, self.1)]
+            }
+        }
+    }
+
+    pub fn fits_inside(&self, other: &Self) -> bool {
+        self.0 >= other.0 && self.1 <= other.1
+    }
+
+    pub fn intersects(&self, other: &Self) -> bool {
+        (self.0..=self.1).contains(&other.0)
+            || (self.0..=self.1).contains(&other.1)
+            || (other.0..=other.1).contains(&self.0)
+            || (other.0..=other.1).contains(&self.1)
+    }
+
+    pub fn size(&self) -> usize {
+        (self.1 - self.0 + 1) as usize
+    }
+}
+
+impl std::fmt::Debug for Region1D {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "({}..{})", self.0, self.1)
+    }
+}
+
+#[derive(Default)]
+pub struct RegionCollection {
+    regions: Vec<Region3D>,
+}
+
+impl RegionCollection {
+    pub fn add_region(&mut self, to_add: Region3D) {
+        self.segment_regions_to_fit(to_add, true)
+    }
+
+    pub fn remove_region(&mut self, to_remove: Region3D) {
+        self.segment_regions_to_fit(to_remove, false)
+    }
+
+    fn segment_regions_to_fit(&mut self, to_fit: Region3D, add_afterwards: bool) {
+        // for each region that intersects with the region to be fit: take it out, split it up, put the pieces back in
+        for i in (0..self.regions.len()).rev() {
+            if self.regions[i].intersects(&to_fit) {
+                let new_regions = self.regions[i].split_excluding_self(&to_fit);
+
+                // PERF: can get rid of this remove
+                self.regions.remove(i);
+                self.regions.extend_from_slice(new_regions.as_slice());
+            }
+        }
+
+        if add_afterwards {
+            self.regions.push(to_fit);
+        }
+    }
+
+    pub fn total_size(&self) -> usize {
+        self.regions.iter().map(|r| r.size()).sum()
+    }
+}
+
+pub struct Day22;
+
+impl AdventOfCode for Day22 {
+    type Input = Vec<Instruction>;
+    type Output = usize;
+
+    fn parse_input(s: &str) -> Self::Input {
+        s.lines().map(Instruction::parse).collect()
+    }
+
+    fn solve_1(input: &Self::Input) -> Self::Output {
+        solve(input, false)
+    }
+
+    fn solve_2(input: &Self::Input) -> Self::Output {
+        solve(input, true)
+    }
+}
+
+fn solve(input: &[Instruction], solve_outside_init: bool) -> usize {
+    let mut regions = RegionCollection::default();
+
+    for &instruction in input {
+        let region = if !solve_outside_init {
+            instruction.region.clamp_to_init()
+        } else {
+            instruction.region
+        };
+
+        if !region.is_empty() {
+            if instruction.state {
+                regions.add_region(region);
+            } else {
+                regions.remove_region(region);
+            }
+        }
+    }
+
+    regions.total_size()
+}
+
+#[test]
+fn test_region_size() {
+    assert_eq!(9, Region3D::parse("x=0..2,y=3..1,z=1..1").size());
+    assert_eq!(198, Region3D::parse("x=10..20,y=-1..1,z=0..5").size());
+}
+
+#[test]
+fn test_split_region1d() {
+    assert_eq!(
+        [Region1D(5, 10)],
+        Region1D(5, 10).split(&Region1D(20, 30)).as_slice(),
+        "outside"
+    );
+
+    assert_eq!(
+        [Region1D(5, 10)],
+        Region1D(5, 10).split(&Region1D(5, 10)).as_slice(),
+        "covers completely"
+    );
+
+    assert_eq!(
+        [Region1D(5, 7), Region1D(8, 10)],
+        Region1D(5, 10).split(&Region1D(0, 7)).as_slice(),
+        "covers left"
+    );
+
+    assert_eq!(
+        [Region1D(5, 7), Region1D(8, 10)],
+        Region1D(5, 10).split(&Region1D(8, 20)).as_slice(),
+        "covers right"
+    );
+
+    assert_eq!(
+        [Region1D(5, 6), Region1D(7, 8), Region1D(9, 10)],
+        Region1D(5, 10).split(&Region1D(7, 8)).as_slice(),
+        "covers center"
+    );
+}
+
+#[test]
+fn test_split_region3d() {
+    assert_eq!(
+        TinyVec::default(),
+        Region3D::parse("x=2..7,y=2..7,z=2..7")
+            .split_excluding_self(&Region3D::parse("x=2..7,y=2..7,z=2..7")),
+        "covers completely",
+    );
+
+    assert_eq!(
+        [Region3D::parse("x=6..7,y=2..7,z=2..7")],
+        Region3D::parse("x=2..7,y=2..7,z=2..7")
+            .split_excluding_self(&Region3D::parse("x=0..5,y=0..9,z=0..9"))
+            .as_slice(),
+        "covers left side",
+    );
+
+    assert_eq!(
+        [
+            Region3D::parse("x=2..7,y=2..7,z=2..3"),
+            Region3D::parse("x=2..7,y=2..7,z=6..7")
+        ],
+        Region3D::parse("x=2..7,y=2..7,z=2..7")
+            .split_excluding_self(&Region3D::parse("x=0..9,y=0..9,z=4..5"))
+            .as_slice(),
+        "covers middle",
+    );
+
+    assert_eq!(
+        26,
+        Region3D::parse("x=2..7,y=2..7,z=2..7")
+            .split_excluding_self(&Region3D::parse("x=4..5,y=4..5,z=4..5"))
+            .len(),
+        "covers center",
+    );
+}
+
+#[test]
+fn part_1_small_sample() {
+    const TEST:&str = "on x=10..12,y=10..12,z=10..12\non x=11..13,y=11..13,z=11..13\noff x=9..11,y=9..11,z=9..11\non x=10..10,y=10..10,z=10..10";
+    let input = Day22::parse_input(TEST);
+    let solution = Day22::solve_1(&input);
+    assert_eq!(39, solution);
+}