fn main() {
    let mut v = [4.1, -5.1, 1.1, -3.1, 2.1];
    v.sort_by(f64::total_cmp);

    println!("Hello, world!");
    for el in v {
        println!("Element {}.", el);
    }

    let mut v = vec![5, 2, 1];
    v.push(2);
    v.push(5);

    for (idx, elem) in v.iter().enumerate() {
        println!("Val: {}. {}.", idx, elem);
    }

    println!("Done");
}