This commit is contained in:
Daniel S. 2022-12-04 15:11:46 +01:00
parent 4aaf8aca52
commit 7da0e7bfac
2 changed files with 58 additions and 0 deletions

57
src/day04.rs Normal file
View file

@ -0,0 +1,57 @@
use aoc_runner_derive::{aoc, aoc_generator};
#[derive(Debug)]
pub struct Range(u8,u8);
impl Range {
fn contains(&self, other: &Self) -> bool {
self.0 <= other.0 && self.1 >= other.1
}
fn overlaps(&self, other: &Self) -> bool {
(self.0 <= other.0 && other.0 <= self.1) || (self.0 <= other.1 && other.1 <= self.1)
}
}
fn parse_range(range: &str) -> Range {
let mut range = range.split('-').map(|v| v.parse().unwrap());
let start = range.next().unwrap();
let end = range.next().unwrap();
Range(start, end)
}
fn parse_line(line: &str) -> (Range, Range) {
let mut line = line.split(',');
let first = line.next().unwrap();
let second = line.next().unwrap();
(parse_range(first), parse_range(second))
}
#[aoc_generator(day4)]
pub fn input_generator(input: &str) -> Vec<(Range, Range)> {
let mut ret = vec![];
for line in input.lines() {
ret.push(parse_line(line))
}
ret
}
#[aoc(day4, part1)]
pub fn solve_part1(input: &[(Range, Range)]) -> usize {
let mut count = 0;
for (a, b) in input {
if a.contains(b) || b.contains(a) {
count += 1;
}
}
count
}
#[aoc(day4, part2)]
pub fn solve_part2(input: &[(Range, Range)]) -> usize {
let mut count = 0;
for (a, b) in input {
if a.overlaps(b) || b.overlaps(a) {
count += 1;
}
}
count
}

View file

@ -2,4 +2,5 @@ use aoc_runner_derive::aoc_lib;
pub mod day01;
pub mod day02;
pub mod day03;
pub mod day04;
aoc_lib! { year = 2022 }