src/day3pt2.rs


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use regex::Regex;

struct Broj {
    broj: u32,
    x: i32,
    y: i32,
    len: i32,
}

struct Simbol {
    x: i32,
    y: i32,
}

pub fn main() {
    let txt = std::fs::read_to_string("./input/day3.txt").unwrap();
    let brojevi = Regex::new(r"\d+").unwrap();
    let simboli = Regex::new(r"[^0-9.]+").unwrap();

    let mut vbr: Vec<Broj> = vec![];
    let mut vsim: Vec<Simbol> = vec![];
    let mut w = 0;
    let mut h = 0;

    for line in txt.lines() {
        if w == 0 {
            w = line.len();
        }

        let m = brojevi.captures_iter(line).collect::<Vec<_>>();
        for i in m {
            let broji = i.get(0).unwrap().as_str().parse::<u32>().unwrap();
            let xi = i32::try_from(i.get(0).unwrap().start()).unwrap();
            let leni = i32::try_from(i.get(0).unwrap().as_str().len()).unwrap();
            vbr.push(Broj {
                broj: broji,
                x: xi,
                y: h,
                len: leni,
            });
        }

        let s = simboli.captures_iter(line).collect::<Vec<_>>();
        for i in s {
            let xi = i32::try_from(i.get(0).unwrap().start()).unwrap();
            vsim.push(Simbol { x: xi, y: h });
        }

        h += 1;
    }

    let mut sum: u32 = 0;

    for sim in vsim.as_slice() {
        let mut cnt: u32 = 0;
        let mut ratio: u32 = 1;
        for br in vbr.as_slice() {
            if i32::abs(sim.y - br.y) < 2 && br.x - 1 <= sim.x && sim.x <= br.x + br.len {
                cnt += 1;
                ratio *= br.broj;
            }
        }
        if cnt == 2 {
            sum += ratio;
        }
    }

    println!("{}", sum);
}