use std::mem;

fn main() {
    let v1: Vec<u8> = Vec::new();
    let v2: Vec<u32> = Vec::new();
    let v3: Vec<String> = Vec::new();

    println!("{} {} {}", mem::size_of_val(&v1), mem::size_of_val(&v2), mem::size_of_val(&v3));
}