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day3: performance - avoid converting &[u8] to &str

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This commit is contained in:
Keenan Tims
2024-12-12 17:38:42 -08:00
parent 3658183deb
commit a5439062a4
3 changed files with 280 additions and 7 deletions
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13
src/day3.rs
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@ -1,4 +1,5 @@
use aoc_runner_derive::{aoc, aoc_generator};
use atoi::FromRadix10;
use regex::bytes::Regex;
use std::io::BufRead;
@ -15,8 +16,7 @@ pub fn part1(input: &Vec<String>) -> u64 {
for line in input {
let line = line.as_bytes();
for m in re.captures_iter(line) {
sum += std::str::from_utf8(&m[1]).unwrap().parse::<u64>().unwrap()
* std::str::from_utf8(&m[2]).unwrap().parse::<u64>().unwrap();
sum += u64::from_radix_10(&m[1]).0 * u64::from_radix_10(&m[2]).0;
}
}
sum
@ -31,12 +31,11 @@ pub fn part2(input: &Vec<String>) -> u64 {
for line in input {
let line = line.as_bytes();
for m in re.captures_iter(line) {
match std::str::from_utf8(&m[1]).unwrap() {
"do()" => do_mul = true,
"don't()" => do_mul = false,
match &m[1] {
b"do()" => do_mul = true,
b"don't()" => do_mul = false,
_ if do_mul => {
sum += std::str::from_utf8(&m[2]).unwrap().parse::<u64>().unwrap()
* std::str::from_utf8(&m[3]).unwrap().parse::<u64>().unwrap()
sum += u64::from_radix_10(&m[2]).0 * u64::from_radix_10(&m[3]).0;
}
_ => {}
}