leetcode83: Remove Duplicates from Sorted List

要求：

Given a sorted linked list, delete all duplicates such that each element appear only once.

For example,
Given 1->1->2, return 1->2.

Given 1->1->2->3->3, return 1->2->3.

删除链表中重复的元素

public ListNode deleteDuplicates(ListNode head) {if (head == null)return null;ListNode node = head;while (node.next != null) {if (node.val == node.next.val)node.next = node.next.next;elsenode = node.next;}return head;}