static void Main(string[] args)
{
//var head = new ListNode(1, new ListNode(2, new ListNode(3, new ListNode(4, new ListNode(5, new ListNode(6,new ListNode(7)))))));
//var head = new ListNode(1);
//head = null;
//head = ListNode.OddEvenList1(head);
//var head = new ListNode(1, new ListNode(0, new ListNode(0)));
//var isPalindrome = ListNode.IsPalindrome(head);
//var l1 = new ListNode(2, new ListNode(4, new ListNode(3)));
//var l2 = new ListNode(5, new ListNode(6, new ListNode(4)));
//var head = ListNode.AddTwoNumbers(l1, l2);
//var head = new Node(1);
//var node2 = new Node(2);
//var node3 = new Node(3);
//var node4 = new Node(4);
//var node5 = new Node(5);
//var node6 = new Node(6);
//var node7 = new Node(7);
//var node8 = new Node(8);
//var node9 = new Node(9);
//var node10 = new Node(10);
//var node11 = new Node(11);
//var node12 = new Node(12);
//head.next = node2;
//node2.prev = head;
//node2.next = node3;
//node3.prev = node2;
//node3.next = node4;
//node4.prev = node3;
//node4.next = node5;
//node5.prev = node4;
//node5.next = node6;
//node6.prev = node5;
//node7.next = node8;
//node8.prev = node7;
//node8.next = node9;
//node9.prev = node8;
//node9.next = node10;
//node10.prev = node9;
//node11.next = node12;
//node12.prev = node11;
//node3.child = node7;
//node8.child = node11;
var head = new Node(1);
var node2 = new Node(2);
var node3 = new Node(3);
head.next = node2;
node2.prev = head;
head.child = node3;
var a = Node.Flatten(null);
}
