solution: day 1

Cargo.lock

@@ -17,9 +17,30 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "allocator-api2"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
+
 [[package]]
 name = "aoc"
 version = "48.0.0"
+dependencies = [
+ "hashbrown 0.15.2",
+ "itertools",
+ "num-integer",
+ "regex",
+]
 
 [[package]]
 name = "autocfg"
@@ -109,6 +130,12 @@ dependencies = [
  "reqwest",
 ]
 
+[[package]]
+name = "either"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60b1af1c220855b6ceac025d3f6ecdd2b7c4894bfe9cd9bda4fbb4bc7c0d4cf0"
+
 [[package]]
 name = "encoding_rs"
 version = "0.8.31"
@@ -118,6 +145,12 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "equivalent"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
+
 [[package]]
 name = "fastrand"
 version = "1.8.0"
@@ -133,6 +166,12 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
+[[package]]
+name = "foldhash"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f81ec6369c545a7d40e4589b5597581fa1c441fe1cce96dd1de43159910a36a2"
+
 [[package]]
 name = "foreign-types"
 version = "0.3.2"
@@ -236,6 +275,17 @@ version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
 
+[[package]]
+name = "hashbrown"
+version = "0.15.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf151400ff0baff5465007dd2f3e717f3fe502074ca563069ce3a6629d07b289"
+dependencies = [
+ "allocator-api2",
+ "equivalent",
+ "foldhash",
+]
+
 [[package]]
 name = "hermit-abi"
 version = "0.2.6"
@@ -333,7 +383,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1885e79c1fc4b10f0e172c475f458b7f7b93061064d98c3293e98c5ba0c8b399"
 dependencies = [
  "autocfg",
- "hashbrown",
+ "hashbrown 0.12.3",
 ]
 
 [[package]]
@@ -351,6 +401,15 @@ version = "2.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "11b0d96e660696543b251e58030cf9787df56da39dab19ad60eae7353040917e"
 
+[[package]]
+name = "itertools"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "413ee7dfc52ee1a4949ceeb7dbc8a33f2d6c088194d9f922fb8318faf1f01186"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "1.0.5"
@@ -437,6 +496,24 @@ dependencies = [
  "tempfile",
 ]
 
+[[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-traits"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "num_cpus"
 version = "1.15.0"
@@ -564,6 +641,35 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "regex"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
+
 [[package]]
 name = "remove_dir_all"
 version = "0.5.3"

Cargo.toml

@@ -21,4 +21,8 @@ authors.workspace = true
 repository.workspace = true
 
 [dependencies]
+hashbrown = "0.15.2"
+itertools = "0.13.0"
+num-integer = "0.1.46"
+regex = "1.11.1"
 

data/examples/01.txt

@@ -0,0 +1,6 @@
+3   4
+4   3
+2   5
+1   3
+3   9
+3   3

src/bin/01.rs

@@ -0,0 +1,57 @@
+use hashbrown::HashMap;
+use itertools::Itertools;
+
+fn parse_input(input: &str) -> impl Iterator<Item = (isize, isize)> + '_ {
+    input.lines().map(|l| {
+        l.split(' ')
+            .filter_map(|x| x.parse::<isize>().ok())
+            .collect_tuple()
+            .unwrap()
+    })
+}
+
+pub fn part_one(input: &str) -> Option<isize> {
+    let mut left = vec![];
+    let mut right = vec![];
+
+    for (a, b) in parse_input(input) {
+        left.push(a);
+        right.push(b);
+    }
+
+    left.sort();
+    right.sort();
+
+    Some(
+        left.into_iter()
+            .zip(right)
+            .map(|(x, y)| (x - y).abs())
+            .sum(),
+    )
+}
+
+pub fn part_two(input: &str) -> Option<isize> {
+    let mut map = HashMap::new();
+
+    for (a, b) in parse_input(input) {
+        map.entry(a).or_insert((0, 0)).0 += 1;
+        map.entry(b).or_insert((0, 0)).1 += 1;
+    }
+
+    Some(map.into_iter().map(|(k, v)| k * v.0 * v.1).sum())
+}
+
+aoc::solution!(1);
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_part_one() {
+        assert_eq!(part_one(&aoc::template::read_file("examples", 1)), Some(11));
+    }
+    #[test]
+    fn test_part_two() {
+        assert_eq!(part_two(&aoc::template::read_file("examples", 1)), Some(31));
+    }
+}

src/lib.rs

@@ -1 +1,4 @@
+#![feature(pattern)]
+
+pub mod parsers;
 pub mod template;

src/parsers.rs

@@ -0,0 +1,20 @@
+use std::str::{pattern::Pattern, FromStr};
+
+pub fn to_vec<T, P>(s: &str, pat: P) -> Vec<T>
+where
+    T: FromStr,
+    P: Pattern,
+{
+    s.split(pat).filter_map(|x| x.parse().ok()).collect()
+}
+
+pub fn to_vec_map<T, U, P>(s: &str, pat: P, func: impl FnMut(T) -> U) -> Vec<U>
+where
+    T: FromStr,
+    P: Pattern,
+{
+    s.split(pat)
+        .filter_map(|x| x.parse().ok())
+        .map(func)
+        .collect()
+}