use std::collections::LinkedList;
fn main() {
let mut lst1=LinkedList::new();
for i in 1..10{
lst1.push_back(i);
}
let mut lst2=LinkedList::new();
for i in 10..20{
lst2.push_back(i);
}
println!("{:?}",lst1);
println!("{:?}",lst2);
lst1.append(&mut lst2);
println!("{:?}",lst1);
println!("{:?}",lst2);
lst1.pop_front();
println!("{:?}",lst1.pop_back().unwrap());
println!("{:?}",lst1);
lst1.push_front(198);
println!("{:?}",lst1);
}