multiple: Use FxHashMap for s p e e d

Cargo.lock

@@ -51,6 +51,7 @@ dependencies = [
  "itertools",
  "rayon",
  "regex",
+ "rustc-hash",
  "thread_local",
 ]
 
@@ -195,6 +196,12 @@ version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
 
+[[package]]
+name = "rustc-hash"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7fb8039b3032c191086b10f11f319a6e99e1e82889c5cc6046f515c9db1d497"
+
 [[package]]
 name = "ryu"
 version = "1.0.18"

Cargo.toml

@@ -11,6 +11,7 @@ grid = { version = "0.1.0", path = "utils/grid" }
 itertools = "0.13.0"
 rayon = "1.10.0"
 regex = "1.11.1"
+rustc-hash = "2.1.0"
 thread_local = "1.1.8"
 
 [profile.release]

src/day1.rs

@@ -1,7 +1,9 @@
 use aoc_runner_derive::{aoc, aoc_generator};
-use std::collections::HashMap;
+use rustc_hash::FxHashMap;
 use std::io::{BufRead, Lines};
 
+type HashMap<K, V> = FxHashMap<K, V>;
+
 #[aoc_generator(day1)]
 pub fn get_input(input: &[u8]) -> Locations {
     Locations::from(input.lines())
@@ -32,7 +34,7 @@ impl Locations {
         self.right.sort();
     }
     fn right_count(&self) -> HashMap<u64, u64> {
-        let mut right_count: HashMap<u64, u64> = HashMap::new();
+        let mut right_count: HashMap<u64, u64> = HashMap::default();
         for rval in &self.right {
             right_count.insert(*rval, *right_count.get(rval).unwrap_or(&0) + 1);
         }

src/day11.rs

@@ -1,10 +1,10 @@
 use aoc_runner_derive::aoc;
 use itertools::Itertools;
-use std::collections::HashMap;
+use rustc_hash::FxHashMap;
 use std::iter::repeat;
 
 type IntType = u64;
-type CacheType = HashMap<Stone, IntType>;
+type CacheType = FxHashMap<Stone, IntType>;
 
 #[derive(Clone, Debug, Hash, PartialEq, Eq)]
 struct Stone(IntType);
@@ -66,7 +66,7 @@ fn count_blinks(stone: &Stone, blink: usize, cache: &mut Vec<CacheType>) -> IntT
 }
 
 fn blink_stones(stones: Stones, blinks: usize) -> IntType {
-    let mut cache = Vec::from_iter(repeat(CacheType::new()).take(blinks));
+    let mut cache = Vec::from_iter(repeat(CacheType::default()).take(blinks));
     stones
         .0
         .iter()

src/day8.rs

@@ -1,9 +1,11 @@
 use aoc_runner_derive::{aoc, aoc_generator};
 use grid::Grid;
 use itertools::Itertools;
-use std::collections::HashSet;
+use rustc_hash::FxHashSet;
 use std::io::BufRead;
 
+type HashSet<T> = FxHashSet<T>;
+
 #[aoc_generator(day8)]
 pub fn get_input(input: &[u8]) -> AntennaMap {
     AntennaMap::from(input)

utils/grid/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "grid"
+version = "0.1.0"