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Author SHA1 Message Date
Xiretza
91f1c1b609 2023 day9/rust: add solution 2023-12-09 12:43:14 +00:00
Xiretza
c1ceef4afd 2023 day9: add data 2023-12-09 12:42:55 +00:00
6 changed files with 323 additions and 0 deletions
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5 11 14 21 61 199 567 1436 3362 7442 15714 31743 61499 114861 208702 373983 672487 1235361 2348306 4631749 9406189
5 25 69 156 311 558 916 1405 2070 3032 4576 7287 12246 21299 37413 65134 111163 185067 300143 474454 732057
20 39 65 91 107 99 48 -71 -290 -649 -1197 -1993 -3107 -4621 -6630 -9243 -12584 -16793 -22027 -28461 -36289
3 -4 -13 -18 -7 56 268 860 2340 5760 13184 28457 58388 114442 214951 387647 671913 1119436 1790793 2743736 4006355
7 16 37 89 206 438 846 1499 2487 3965 6239 9896 15966 26085 42604 68560 107391 162238 234633 322323 415926
11 33 63 116 217 405 761 1479 3008 6307 13274 27434 55000 106455 198842 358993 627977 1067101 1765857 2852272 4506187
10 24 42 70 132 289 684 1642 3880 8917 19816 42437 87430 173248 330510 608091 1081358 1863006 3116974 5075936 8062864
4 23 63 133 242 399 613 893 1248 1687 2219 2853 3598 4463 5457 6589 7868 9303 10903 12677 14634
2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 53 56 59 62
4 6 15 38 91 225 572 1422 3345 7377 15301 30079 56530 102394 179955 308387 516882 848304 1362335 2135300 3250013
23 45 74 112 168 269 484 964 2001 4109 8130 15368 27754 48045 80060 128956 201547 306669 455594 662496 944972
3 20 46 77 107 128 130 101 27 -108 -322 -635 -1069 -1648 -2398 -3347 -4525 -5964 -7698 -9763 -12197
9 13 27 56 105 179 283 422 601 825 1099 1428 1817 2271 2795 3394 4073 4837 5691 6640 7689
6 13 33 74 138 231 383 688 1385 3011 6666 14438 30043 59741 113594 207136 363528 616273 1012567 1617362 2518216

10
2023/day9/rust/Cargo.toml Normal file
View file

@ -0,0 +1,10 @@
[package]
name = "rust_2023_09"
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 = "0.12.0"

102
2023/day9/rust/src/main.rs Normal file
View file

@ -0,0 +1,102 @@
#![warn(clippy::pedantic)]
use std::{collections::VecDeque, io::stdin};
use itertools::Itertools;
type Value = isize;
fn make_derivative(xs: &[Value]) -> Option<VecDeque<Value>> {
if xs.iter().all_equal() {
None
} else {
Some(xs.iter().tuple_windows().map(|(a, b)| b - a).collect())
}
}
#[derive(Debug, Clone, Copy)]
enum Direction {
Forward,
Backward,
}
#[derive(Debug)]
struct History {
values: VecDeque<Value>,
derivatives: Vec<VecDeque<Value>>,
}
impl History {
pub fn new(values: VecDeque<Value>) -> Self {
let derivatives = std::iter::successors(Some(values.clone()), |prev| {
let (s1, s2) = prev.as_slices();
assert!(s2.is_empty());
make_derivative(s1)
})
.skip(1)
.collect();
Self {
values,
derivatives,
}
}
pub fn expand(&mut self, direction: Direction) {
Self::expand_values(&mut self.values, &mut self.derivatives, direction);
}
fn expand_values(
values: &mut VecDeque<Value>,
derivatives: &mut [VecDeque<Value>],
direction: Direction,
) {
if !derivatives.is_empty() {
let (next_values, next_derivatives) = derivatives.split_first_mut().unwrap();
Self::expand_values(next_values, next_derivatives, direction);
}
match direction {
Direction::Forward => {
let derivative = derivatives.first().map_or(0, |d| *d.back().unwrap());
values.push_back(*values.back().unwrap() + derivative);
}
Direction::Backward => {
let derivative = derivatives.first().map_or(0, |d| *d.front().unwrap());
values.push_front(*values.front().unwrap() - derivative);
}
}
}
}
fn main() {
let mut histories: VecDeque<_> = stdin()
.lines()
.map(Result::unwrap)
.map(|l| History::new(l.split(' ').map(|n| n.parse().unwrap()).collect()))
.collect();
for history in &mut histories {
history.expand(Direction::Forward);
}
println!(
"{}",
histories
.iter()
.map(|h| h.values.back().unwrap())
.sum::<Value>()
);
for history in &mut histories {
history.expand(Direction::Backward);
}
println!(
"{}",
histories
.iter()
.map(|h| h.values.front().unwrap())
.sum::<Value>()
);
}

8
Cargo.lock generated
View file

@ -679,6 +679,14 @@ dependencies = [
"petgraph",
]
[[package]]
name = "rust_2023_09"
version = "0.1.0"
dependencies = [
"aoc",
"itertools 0.12.0",
]
[[package]]
name = "rustversion"
version = "1.0.14"

1
Cargo.toml
View file

@ -34,4 +34,5 @@ members = [
"2023/day6/rust",
"2023/day7/rust",
"2023/day8/rust",
"2023/day9/rust",
]