Advent of Code solutions
Day 3
+23
-5
+1
Cargo.lock
+1
Cargo.lock
+1
years/2024/Cargo.toml
+1
years/2024/Cargo.toml
+19
-5
years/2024/src/day_3.rs
+19
-5
years/2024/src/day_3.rs
···
1
1
2
2
use advent_core::{Day, day_stuff, ex_for_day};
3
+
use regex::RegexBuilder;
3
4
4
5
pub struct Day3;
6
+
7
+
const RE: &str = r"mul\((\d+),(\d+)\)";
8
+
9
+
fn re_do(i: &str) -> u64 {
10
+
let re = RegexBuilder::new(RE).multi_line(true).build().unwrap();
11
+
re.captures_iter(i).map(|c| {
12
+
c.get(1).unwrap().as_str().parse::<u64>().unwrap()
13
+
*
14
+
c.get(2).unwrap().as_str().parse::<u64>().unwrap()
15
+
}).sum::<u64>()
16
+
}
5
17
6
18
impl Day for Day3 {
7
19
8
-
day_stuff!(3, "", "");
20
+
day_stuff!(3, "161", "48");
9
21
10
-
fn part_1(_input: Self::Input) -> Option<String> {
11
-
None
22
+
fn part_1(input: Self::Input) -> Option<String> {
23
+
Some(re_do(&input).to_string())
12
24
}
13
25
14
-
fn part_2(_input: Self::Input) -> Option<String> {
15
-
None
26
+
fn part_2(input: Self::Input) -> Option<String> {
27
+
Some(input.split("do()").map(|v|
28
+
re_do(v.split("don't()").nth(0).unwrap())
29
+
).sum::<u64>().to_string())
16
30
}
17
31
}
+1
years/2024/src/examples/day_3/1.txt
+1
years/2024/src/examples/day_3/1.txt
···
1
+
xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))
+1
years/2024/src/examples/day_3/2.txt
+1
years/2024/src/examples/day_3/2.txt
···
1
+
xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))