Leetcode82 Remove Duplicates from Sorted List II

题目链接：

Remove Duplicates from Sorted List II

题目简介：

1-2-3-3-4-4-5  返回 1-2-5

1-1-2-3 返回 2-3

题目解答：

/*** Definition for singly-linked list.* public class ListNode {*     int val;*     ListNode next;*     ListNode() {}*     ListNode(int val) { this.val = val; }*     ListNode(int val, ListNode next) { this.val = val; this.next = next; }* }*/
class Solution {public ListNode deleteDuplicates(ListNode head) {if(head == null)return head;ListNode pre = null; ListNode now = head;ListNode latest_point_holder = null; //  asume 100% has valueListNode realHead = null;// 1 2 3 3 4 4 5while(now!=null){// see pre && nextif(pre!=null){if(now.val == pre.val){now = now.next;continue;}}if(now.next!=null){if(now.next.val ==now.val){pre=now;now=now.next;continue;}}// !=pre && !=nextif(now!=null&&realHead == null){realHead = now;latest_point_holder = now;pre = now;now=now.next;}else {if(now!=null){latest_point_holder.next = now;latest_point_holder=now;pre = now;now=now.next;}}}if(latest_point_holder!=null)latest_point_holder.next=null;return realHead;}
}

 题目耗时：0ms