fn main() {
    fn add(v1 : Vec<i32>, v2 : Vec<i32>) -> Vec<i32> {
        let mut vec = Vec::new();
        let it = v1.iter().zip(v2.iter());
        for (i,j) in it {
            vec.push(i+j);
        }
        vec
    }
    let v1 = vec![1,2,3];
    let v2 = vec![1,2,3];
    println!("{:?}",add(v1,v2));
}


fn main() {
    fn add(v1 : &mut Vec<i32>, v2 : &Vec<i32>) {
        let it = v1.iter_mut().zip(v2.iter());
        for (i,j) in it {
            *i += *j;
        }
    }
    let mut v1 = vec![1,2,3];
    let v2 = vec![1,2,3];
    add(&mut v1,&v2);
    println!("{:?}",v1);
}