【Leetcode】Remove Duplicates from Sorted List

原题链接：https://leetcode.com/problems/remove-duplicates-from-sorted-list/

题目：

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.

思路：

算法：

 public ListNode deleteDuplicates(ListNode head) {
     ListNode p = head, q;
     if (p == null) {
         return head;
     }
     q = p.next;
     while (q != null) {
         if (p.val == q.val) {
             p.next = q.next;
         } else {
             p = q;
         }
         q = q.next;
     }
     return head;
 }