projecteuler.net/036/main.rs

fn test_10(n: u32) -> bool {
    let s = n.to_string();
    let sv = s.chars().collect::<Vec<char>>();
    let svr = s.chars().rev().collect::<Vec<char>>();
    for i in 0..s.len() {
        if sv[i] != svr[i] {
            return false;
        }
    }
    return true;
}
fn test_2(n: u32) -> bool {
    let mut sv = Vec::new();
    let mut a = n;
    while a > 0 {
        sv.push(a % 2);
        a /= 2;
    }
    let mut svr = sv.clone();
    svr.reverse();
    for i in 0..sv.len() {
        if sv[i] != svr[i] { return false; }
    }
    return true;
}

fn main() {
    let mut sum = 0;
    for n in 1..1_000_000 {
        if test_10(n) && test_2(n) {
            println!("{}", n);
            sum += n;
        }
    }
    println!("{}", sum);
    
}