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day8

This commit is contained in:
Jan-Bulthuis 2024-12-08 10:54:48 +01:00
parent 232f91920d
commit 1277882310
5 changed files with 207 additions and 0 deletions
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80
aoc_2024/Cargo.lock generated
View File

@ -47,10 +47,17 @@ dependencies = [
"aoc-runner",
"aoc-runner-derive",
"nom",
"num",
"regex",
"topological-sort",
]
[[package]]
name = "autocfg"
version = "1.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
[[package]]
name = "itoa"
version = "1.0.14"
@ -79,6 +86,79 @@ dependencies = [
"minimal-lexical",
]
[[package]]
name = "num"
version = "0.4.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "35bd024e8b2ff75562e5f34e7f4905839deb4b22955ef5e73d2fea1b9813cb23"
dependencies = [
"num-bigint",
"num-complex",
"num-integer",
"num-iter",
"num-rational",
"num-traits",
]
[[package]]
name = "num-bigint"
version = "0.4.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a5e44f723f1133c9deac646763579fdb3ac745e418f2a7af9cd0c431da1f20b9"
dependencies = [
"num-integer",
"num-traits",
]
[[package]]
name = "num-complex"
version = "0.4.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "73f88a1307638156682bada9d7604135552957b7818057dcef22705b4d509495"
dependencies = [
"num-traits",
]
[[package]]
name = "num-integer"
version = "0.1.46"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7969661fd2958a5cb096e56c8e1ad0444ac2bbcd0061bd28660485a44879858f"
dependencies = [
"num-traits",
]
[[package]]
name = "num-iter"
version = "0.1.45"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1429034a0490724d0075ebb2bc9e875d6503c3cf69e235a8941aa757d83ef5bf"
dependencies = [
"autocfg",
"num-integer",
"num-traits",
]
[[package]]
name = "num-rational"
version = "0.4.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f83d14da390562dca69fc84082e73e548e1ad308d24accdedd2720017cb37824"
dependencies = [
"num-bigint",
"num-integer",
"num-traits",
]
[[package]]
name = "num-traits"
version = "0.2.19"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
dependencies = [
"autocfg",
]
[[package]]
name = "proc-macro2"
version = "1.0.92"

1
aoc_2024/Cargo.toml
View File

@ -7,5 +7,6 @@ edition = "2021"
aoc-runner = "0.3.0"
aoc-runner-derive = "0.3.0"
nom = "7.1.3"
num = "0.4.3"
regex = "1.11.1"
topological-sort = "0.2.2"

8
aoc_2024/src/day3.rs
View File

@ -52,6 +52,10 @@ mod tests {
)),
161
);
assert_eq!(
part1(&parse(include_str!("../input/2024/day3.txt"))),
191183308
);
}
#[test]
@ -62,5 +66,9 @@ mod tests {
)),
48
);
assert_eq!(
part2(&parse(include_str!("../input/2024/day3.txt"))),
92082041
);
}
}

117
aoc_2024/src/day8.rs Normal file
View File

@ -0,0 +1,117 @@
use std::collections::{HashMap, HashSet};
use aoc_runner_derive::{aoc, aoc_generator};
use num::integer::gcd;
type Input = ((isize, isize), Vec<Vec<(isize, isize)>>);
#[aoc_generator(day8)]
fn parse(input: &str) -> Input {
let mut map = HashMap::new();
let h = input.lines().count();
let w = input.lines().find(|_| true).unwrap().len();
input.lines().enumerate().for_each(|(y, line)| {
line.chars()
.enumerate()
.filter(|(_, c)| c != &'.')
.for_each(|(x, c)| {
if let std::collections::hash_map::Entry::Vacant(e) = map.entry(c) {
e.insert(vec![(x as isize, y as isize)]);
} else {
map.get_mut(&c).unwrap().push((x as isize, y as isize));
}
});
});
let vec = map.into_values().collect();
((w as isize, h as isize), vec)
}
#[aoc(day8, part1)]
fn part1(input: &Input) -> usize {
let mut set = HashSet::new();
input.1.iter().for_each(|vec| {
for l in 0..vec.len() {
for r in l + 1..vec.len() {
let a1 = vec[l];
let a2 = vec[r];
let c1 = (2 * a1.0 - a2.0, 2 * a1.1 - a2.1);
let c2 = (2 * a2.0 - a1.0, 2 * a2.1 - a1.1);
if c1.0 >= 0 && c1.0 < input.0 .0 && c1.1 >= 0 && c1.1 < input.0 .1 {
set.insert(c1);
}
if c2.0 >= 0 && c2.0 < input.0 .0 && c2.1 >= 0 && c2.1 < input.0 .1 {
set.insert(c2);
}
}
}
});
set.len()
}
#[aoc(day8, part2)]
fn part2(input: &Input) -> usize {
let mut set = HashSet::new();
input.1.iter().for_each(|vec| {
for l in 0..vec.len() {
for r in l + 1..vec.len() {
let a1 = vec[l];
let a2 = vec[r];
let s = a1;
let v = (a2.0 - a1.0, a2.1 - a1.1);
let v = (v.0 / gcd(v.0, v.1), v.1 / gcd(v.0, v.1));
let mut d = 0;
loop {
let c = (s.0 + d * v.0, s.1 + d * v.1);
d += 1;
if c.0 >= 0 && c.0 < input.0 .0 && c.1 >= 0 && c.1 < input.0 .1 {
set.insert(c);
} else {
break;
}
}
let mut d = 0;
loop {
let c = (s.0 + d * v.0, s.1 + d * v.1);
d -= 1;
if c.0 >= 0 && c.0 < input.0 .0 && c.1 >= 0 && c.1 < input.0 .1 {
set.insert(c);
} else {
break;
}
}
}
}
});
// for y in 0..input.0 .1 {
// println!();
// for x in 0..input.0 .0 {
// print!("{}", if set.contains(&(x, y)) { '#' } else { '.' })
// }
// }
set.len()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn part1_example() {
assert_eq!(
part1(&parse(
"............\n........0...\n.....0......\n.......0....\n....0.......\n......A.....\n............\n............\n........A...\n.........A..\n............\n............"
)),
14
);
}
#[test]
fn part2_example() {
assert_eq!(
part2(&parse(
"............\n........0...\n.....0......\n.......0....\n....0.......\n......A.....\n............\n............\n........A...\n.........A..\n............\n............"
)),
34
);
}
}

1
aoc_2024/src/lib.rs
View File

@ -1,3 +1,4 @@
mod day8;
mod day1;
mod day2;
mod day3;