main
idylls 1 year ago
parent 76dfcb47a1
commit 9719b895ce
Signed by: idylls
GPG Key ID: 8A7167CBC2CC9F0F

9
Cargo.lock generated

@ -5,3 +5,12 @@ version = 3
[[package]]
name = "aoc2022"
version = "0.1.0"
dependencies = [
"seahash",
]
[[package]]
name = "seahash"
version = "4.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1c107b6f4780854c8b126e228ea8869f4d7b71260f962fefb57b996b8959ba6b"

@ -6,3 +6,4 @@ edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
seahash = { version = "4.1.0", features = [], default-features = false }

@ -0,0 +1,68 @@
use crate::util::prelude::*;
static INPUT: &str = include_str!("inputs/day3.txt");
type Item = char;
pub fn item_prio(item: &Item) -> uint {
if ('a'..='z').contains(&item) {
return (*item as uint - 'a' as uint) + 1;
}
if ('A'..='Z').contains(&item) {
return (*item as uint - 'A' as uint) + 27;
}
panic!()
}
pub fn part1() {
let sum = INPUT
.split('\n')
.filter(|s| !s.is_empty())
.map(|line| {
let len = line.len();
let (fst_ruck_str, snd_ruck_str) = line.split_at(len / 2);
let fst_ruck = fst_ruck_str.chars().collect::<HashSet<_>>();
let snd_ruck = snd_ruck_str.chars().collect::<HashSet<_>>();
let both = fst_ruck.intersection(&snd_ruck).collect::<HashSet<_>>();
assert!(both.len() == 1);
let both = both.iter().next().unwrap();
item_prio(*both)
})
.sum::<uint>();
println!("{}", sum);
}
pub fn part2() {
let lines: Vec<_> = INPUT.split('\n').filter(|s| !s.is_empty()).collect();
let elf_groups = lines.chunks_exact(3);
let sum: uint = elf_groups
.flat_map(|lines| {
let item_counts = lines
.iter()
.map(|line| line.chars().collect::<HashSet<_>>())
.fold(HashMap::default(), |mut map, set| {
for v in set.iter() {
let ct = map.entry(*v).or_insert(0);
*ct += 1;
}
map
});
item_counts
.iter()
.max_by(|a, b| a.1.cmp(b.1))
.map(|v| item_prio(v.0))
})
.sum();
println!("{}", sum);
}

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@ -0,0 +1,19 @@
pub type uint = u64;
pub type sint = i64;
#[derive(Default)]
pub struct BuildSeaHash;
impl core::hash::BuildHasher for BuildSeaHash {
type Hasher = seahash::SeaHasher;
fn build_hasher(&self) -> Self::Hasher {
seahash::SeaHasher::new()
}
}
pub type HashMap<K, V> = std::collections::HashMap<K, V, BuildSeaHash>;
pub type HashSet<K> = std::collections::HashSet<K, BuildSeaHash>;
pub mod prelude {
pub use super::{sint, uint, HashMap, HashSet};
}
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