projecteuler.net/023/main.rs

const NUMS_LEN: usize = 28124;


fn is_abundant(n: usize) -> bool {
    let mut s = 0;
    for i in 1..n {
        if n % i == 0 {
            s += i;
        }
    }
    return s > n;
}

fn main() {
    //let r = is_abundant(12);
    let mut ambs = Vec::<usize>::new();
    
    for i in 1..NUMS_LEN {
        if is_abundant(i) {
            ambs.push(i);
        }
    }

    let mut candidates: [bool; NUMS_LEN] = [false; NUMS_LEN];

    for a in &ambs {
        //println!("a: {}", a);
        for b in &ambs {
            if a + b < NUMS_LEN {
                candidates[a + b] = true;
            }
        }
    }

    let mut res_sum = 0usize;

    for i in 0..NUMS_LEN {
        if !candidates[i] {
            res_sum += i;
        }
    }

    println!("result: {}", res_sum);
    
    //println!("is abundant: {}", r);
}