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day3: disable unicode matching, don't recompile RE for every iteration

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This commit is contained in:
Keenan Tims
2024-12-04 16:39:57 -08:00
parent e5faee3470
commit dc67b38420
3 changed files with 29 additions and 9 deletions
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18
3/src/main.rs
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@@ -1,4 +1,4 @@
use regex::Regex;
use regex::bytes::Regex;
use std::fs::File;
use std::io::{BufRead, BufReader, Lines};
use std::time::{Duration, Instant};
@@ -39,10 +39,11 @@ fn main() {
fn problem1<T: BufRead>(input: Lines<T>) -> u64 {
let mut sum = 0u64;
let re = Regex::new(r"(?-u)mul\((\d+),(\d+)\)").unwrap();
for line in input.map(|i| i.unwrap()) {
let re = Regex::new(r"mul\((\d+),(\d+)\)").unwrap();
for m in re.captures_iter(&line) {
sum += m[1].parse::<u64>().unwrap() * m[2].parse::<u64>().unwrap();
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
@@ -52,13 +53,14 @@ fn problem1<T: BufRead>(input: Lines<T>) -> u64 {
fn problem2<T: BufRead>(input: Lines<T>) -> u64 {
let mut sum = 0u64;
let mut do_mul = true;
let re = Regex::new(r"(?-u)(do\(\)|don't\(\)|mul\((\d+),(\d+)\))").unwrap();
for line in input.map(|i| i.unwrap()) {
let re = Regex::new(r"(do\(\)|don't\(\)|mul\((\d+),(\d+)\))").unwrap();
for m in re.captures_iter(&line) {
match &m[1] {
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,
_ if do_mul => sum += m[2].parse::<u64>().unwrap() * m[3].parse::<u64>().unwrap(),
_ if do_mul => sum += std::str::from_utf8(&m[2]).unwrap().parse::<u64>().unwrap() * std::str::from_utf8(&m[3]).unwrap().parse::<u64>().unwrap(),
_ => {}
}
}