ktims/aoc2024
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source
This commit is contained in:
Keenan Tims 2024-12-04 16:39:57 -08:00
parent e5faee3470
commit 037e395c58
Signed by: ktims
GPG Key ID: 11230674D69038D4
1 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
3/src/main.rs
View File

@ -1,4 +1,4 @@
use regex::Regex; use regex::bytes::Regex;
use std::fs::File; use std::fs::File;
use std::io::{BufRead, BufReader, Lines}; use std::io::{BufRead, BufReader, Lines};
use std::time::{Duration, Instant}; use std::time::{Duration, Instant};
@ -39,10 +39,11 @@ fn main() {
fn problem1<T: BufRead>(input: Lines<T>) -> u64 { fn problem1<T: BufRead>(input: Lines<T>) -> u64 {
let mut sum = 0u64; let mut sum = 0u64;
let re = Regex::new(r"(?-u)mul\((\d+),(\d+)\)").unwrap();
for line in input.map(|i| i.unwrap()) { for line in input.map(|i| i.unwrap()) {
let re = Regex::new(r"mul\((\d+),(\d+)\)").unwrap(); let line = line.as_bytes();
for m in re.captures_iter(&line) { for m in re.captures_iter(line) {
sum += m[1].parse::<u64>().unwrap() * m[2].parse::<u64>().unwrap(); sum += std::str::from_utf8(&m[1]).unwrap().parse::<u64>().unwrap() * std::str::from_utf8(&m[2]).unwrap().parse::<u64>().unwrap();
} }
} }
sum sum
@ -52,13 +53,14 @@ fn problem1<T: BufRead>(input: Lines<T>) -> u64 {
fn problem2<T: BufRead>(input: Lines<T>) -> u64 { fn problem2<T: BufRead>(input: Lines<T>) -> u64 {
let mut sum = 0u64; let mut sum = 0u64;
let mut do_mul = true; 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()) { for line in input.map(|i| i.unwrap()) {
let re = Regex::new(r"(do\(\)|don't\(\)|mul\((\d+),(\d+)\))").unwrap(); let line = line.as_bytes();
for m in re.captures_iter(&line) { for m in re.captures_iter(line) {
match &m[1] { match std::str::from_utf8(&m[1]).unwrap() {
"do()" => do_mul = true, "do()" => do_mul = true,
"don't()" => do_mul = false, "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(),
_ => {} _ => {}
} }
} }