aoc22/src/day4.rs

use regex::Regex;

#[derive(Debug)]
pub struct Assignment {
    pub lower_bound: u32,
    pub upper_bound: u32,
}

impl Assignment {
    pub fn contains(&self, other: &Self) -> bool {
        self.lower_bound <= other.lower_bound && self.upper_bound >= other.upper_bound
    }

    pub fn overlaps(&self, other: &Self) -> bool {
        self.lower_bound <= other.upper_bound && self.upper_bound >= other.lower_bound
    }
}

pub fn parse_assignments(input: &String) -> Vec<(Assignment, Assignment)> {
    let re = Regex::new(r"(\d+)-(\d+),(\d+)-(\d+)").unwrap();
    let mut assignments = Vec::new();

    for line in input.lines() {
        assert!(re.is_match(line));
        let captures = re.captures(line).unwrap();
        let ass1 = Assignment {
            lower_bound: captures.get(1).unwrap().as_str().parse().unwrap(),
            upper_bound: captures.get(2).unwrap().as_str().parse().unwrap(),
        };
        let ass2 = Assignment {
            lower_bound: captures.get(3).unwrap().as_str().parse().unwrap(),
            upper_bound: captures.get(4).unwrap().as_str().parse().unwrap(),
        };
        assignments.push((ass1, ass2));
    }

    assignments
}