rust 泛型

fn max<T: std::cmp::PartialOrd >(nn: &Vec<T>) -> &T {
    let mut f = &nn[0];
    for i in nn{
        if i > f {
            f = i;
        }
    }
    f
}
fn main(){
    let v = vec![11,23,13,1,2,4,678,3,215,61];
    let k = vec![11.2,23.3,13.12,61.98];
    let m = vec!["lilei","zhangs","wangw","liulu"];
    let ret = max(&v);
    let rrt = max(&k);
    let rwt = max(&m);
    println!("max int is: {} ",ret);
    println!("max float is: {} ",rrt);
    println!("max &str is: {}", rwt);
}

## output
max int is: 678
max float is: 61.98
max &str is: zhangs