//Need an example of PopLeft, PopRight and function to work with a doubly linkedlist:

public class Que {

Node first = null; Node last = null; int N = 0; static class Node { public Node() { } public int item; public Node next; public Node prev; }

public int PopLeft () {

return;}

public int PopRight () {

return;}

public int delete (int k) {

return;}

//Thanks