leetcode----------Remove Duplicates from Sorted List

题目	Remove Duplicates from Sorted List
通过率	34.4%
难度	Easy

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.

 

 初步构想：处理的对象是Sorted List，既然是已经排好序的链表，所以需要做的就是逐个比较，先将首元素加入到结果链表，然后遍历整个链表，具有相同取值的元素略过，继续比较，遇到不通过的则添加，需要两个指针，一个search指针进行遍历，一个resultHead进行记录。

 java代码：

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) {
 *         val = x;
 *         next = null;
 *     }
 * }
 */
public class Solution {
    public ListNode deleteDuplicates(ListNode head) {
         ListNode search = null,resultHead = head;
         if(head==null || head.next==null) return head;
         while(head.next!=null){
             search=head.next;
             if(head.val==search.val){
                 if(search.next!=null){
                     head.next=search.next;
                 }else{
                     head.next=null;
                 }
             }else if(head.val!=search.val){
                 head=head.next;
             }
         }
      return resultHead;
    }
}