Remove Duplicates from Sorted List

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.

 1 /**
 2  * Definition for singly-linked list.
 3  * public class ListNode {
 4  *     int val;
 5  *     ListNode next;
 6  *     ListNode(int x) {
 7  *         val = x;
 8  *         next = null;
 9  *     }
10  * }
11  */
12 public class Solution {
13     public ListNode deleteDuplicates(ListNode head) {
14         ListNode header = new ListNode(Integer.MAX_VALUE);
15         header.next = head;
16         ListNode cur = header, pre = header.next;
17         while(pre != null){
18             if(pre.val != cur.val){
19                 cur.next = pre;
20                 pre = pre.next;
21                 cur = cur.next;
22                 cur.next = null;
23             }else
24                 pre = pre.next;
25         }
26         return header.next;
27     }
28 }

 

posted on 2014-09-05 05:29  Step-BY-Step  阅读(128)  评论(0)  编辑  收藏  举报

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