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Day 22

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Zoé Cassiopée Gauthier 2021-12-23 08:14:09 -05:00
parent 5572ea973e
commit 96e7d52445
3 changed files with 625 additions and 0 deletions
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7
Cargo.toml
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@ -3,6 +3,9 @@ name = "advent2021"
version = "0.1.0"
edition = "2021"
[profile.release]
debug = 1
[[bin]]
name = "day1"
path = "src/day1.rs"
@ -86,3 +89,7 @@ path = "src/day20.rs"
[[bin]]
name = "day21"
path = "src/day21.rs"
[[bin]]
name = "day22"
path = "src/day22.rs"

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inputs/day22.txt Normal file
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use std::{ops::RangeInclusive, str::FromStr};
#[derive(Clone, Debug)]
struct Cuboid {
positive: bool,
x: RangeInclusive<i64>,
y: RangeInclusive<i64>,
z: RangeInclusive<i64>,
}
fn contains_range(a: &RangeInclusive<i64>, b: &RangeInclusive<i64>) -> bool {
b.start() >= a.start() && b.end() <= a.end()
}
impl Cuboid {
fn contains(&self, other: &Cuboid) -> bool {
contains_range(&self.x, &other.x)
&& contains_range(&self.y, &other.y)
&& contains_range(&self.z, &other.z)
}
fn volume(&self) -> u64 {
((self.x.end() + 1 - self.x.start())
* (self.y.end() + 1 - self.y.start())
* (self.z.end() + 1 - self.z.start())) as u64
}
}
impl FromStr for Cuboid {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
let positive = match &s[0..3] {
"on " => true,
"off" => false,
_ => return Err(()),
};
let w = s.splitn(12, &['=', '.', ','][..]).collect::<Vec<&str>>();
let x = w[1].parse().unwrap()..=w[3].parse().unwrap();
let y = w[5].parse().unwrap()..=w[7].parse().unwrap();
let z = w[9].parse().unwrap()..=w[11].parse().unwrap();
Ok(Cuboid { positive, x, y, z })
}
}
#[derive(Debug)]
struct Segments {
inner: Vec<RangeInclusive<i64>>,
}
impl Segments {
fn new(ranges: &[RangeInclusive<i64>]) -> Segments {
let mut starts = ranges.iter().map(|r| *r.start()).collect::<Vec<i64>>();
starts.sort_unstable();
starts.dedup();
let mut starts_iter = starts.into_iter().peekable();
let mut ends = ranges.iter().map(|r| *r.end()).collect::<Vec<i64>>();
ends.sort_unstable();
ends.dedup();
let mut ends_iter = ends.into_iter().peekable();
let mut inner = Vec::new();
let mut start = starts_iter.next().unwrap();
while let Some(maybe_end) = ends_iter.peek() {
if maybe_end < &start {
ends_iter.next();
continue;
}
if let Some(maybe_start) = starts_iter.peek() {
if maybe_start <= &start {
starts_iter.next();
continue;
}
if maybe_start <= maybe_end {
let end = starts_iter.next().unwrap();
inner.push(start..=end - 1);
start = end;
} else {
let end = ends_iter.next().unwrap();
inner.push(start..=end);
start = end + 1;
}
} else {
let end = ends_iter.next().unwrap();
inner.push(start..=end);
start = end + 1;
}
}
Segments { inner }
}
}
fn reboot(steps: &[Cuboid]) -> u64 {
let x_segments = Segments::new(
&steps
.iter()
.map(|s| s.x.clone())
.collect::<Vec<RangeInclusive<i64>>>(),
);
let y_segments = Segments::new(
&steps
.iter()
.map(|s| s.y.clone())
.collect::<Vec<RangeInclusive<i64>>>(),
);
let z_segments = Segments::new(
&steps
.iter()
.map(|s| s.z.clone())
.collect::<Vec<RangeInclusive<i64>>>(),
);
let mut count = 0;
for x in x_segments.inner {
let mut cuboid = Cuboid {
positive: true,
x: x.clone(),
y: 0..=0,
z: 0..=0,
};
for y in &y_segments.inner {
cuboid.y.clone_from(y);
for z in &z_segments.inner {
cuboid.z.clone_from(z);
let mut on = false;
for step in steps.iter() {
if step.contains(&cuboid) {
on = step.positive;
}
}
if on {
count += cuboid.volume()
}
}
}
}
count
}
fn main() {
const INPUT: &str = include_str!("../inputs/day22.txt");
let steps = INPUT
.lines()
.map(|line| line.parse().unwrap())
.collect::<Vec<Cuboid>>();
println!("solution {}", reboot(&steps[..20]));
println!("solution {}", reboot(&steps));
}
#[test]
fn test_example() {
const INPUT: &str = "on x=10..12,y=10..12,z=10..12
on x=11..13,y=11..13,z=11..13
off x=9..11,y=9..11,z=9..11
on x=10..10,y=10..10,z=10..10";
let steps = INPUT
.lines()
.map(|line| line.parse().unwrap())
.collect::<Vec<Cuboid>>();
assert_eq!(reboot(&steps), 39);
}
#[test]
fn test_reboot() {
const INPUT: &str = "on x=-20..26,y=-36..17,z=-47..7
on x=-20..33,y=-21..23,z=-26..28
on x=-22..28,y=-29..23,z=-38..16
on x=-46..7,y=-6..46,z=-50..-1
on x=-49..1,y=-3..46,z=-24..28
on x=2..47,y=-22..22,z=-23..27
on x=-27..23,y=-28..26,z=-21..29
on x=-39..5,y=-6..47,z=-3..44
on x=-30..21,y=-8..43,z=-13..34
on x=-22..26,y=-27..20,z=-29..19
off x=-48..-32,y=26..41,z=-47..-37
on x=-12..35,y=6..50,z=-50..-2
off x=-48..-32,y=-32..-16,z=-15..-5
on x=-18..26,y=-33..15,z=-7..46
off x=-40..-22,y=-38..-28,z=23..41
on x=-16..35,y=-41..10,z=-47..6
off x=-32..-23,y=11..30,z=-14..3
on x=-49..-5,y=-3..45,z=-29..18
off x=18..30,y=-20..-8,z=-3..13
on x=-41..9,y=-7..43,z=-33..15
";
let steps = INPUT
.lines()
.map(|line| line.parse().unwrap())
.collect::<Vec<Cuboid>>();
assert_eq!(reboot(&steps), 590784);
}