203. 移除链表中的元素 Remove Linked List Elements

Remove all elements from a linked list of integers that have value val.

Example
Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6
Return: 1 --> 2 --> 3 --> 4 --> 5

题意：移除链表中指定val的元素

注意：考虑删除节点在尾部，以及连续删除两个相邻节点的情况

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     public int val;
 *     public ListNode next;
 *     public ListNode(int x) { val = x; }
 * }
 */
public class Solution {
	public void Delete(ListNode node) {
		node.val = node.next.val;
		node.next = node.next.next;
	}

	public ListNode RemoveElements(ListNode head, int val) {
		ListNode node = head;
		ListNode last = null;
		while (node != null) {
			if (node.val == val) {
				if (node.next != null) {
					Delete(node);
                    continue;
				} else {
					if (last != null) {
						last.next = null;
					} else {
						return null;
					}
				}
			}
			last = node;
			node = node.next;
		}
		return head;
	}
}

null