multiple: Use FxHashMap for s p e e d

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)