Leetcode 82 Remove Duplicates from Sorted List II

Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.

For example,

Given 1->2->3->3->4->4->5, return 1->2->5.

Given 1->1->1->2->3, return 2->3.

删除链表中重复出现的节点，和83题类似

https://cloud.tencent.com/developer/article/1019218

难点在于重复出现的第一个也不能保留，

所以要遇到重复的时候要一直找到不重复的为止，判断它与后一个节点不一致时才能加入答案

代码语言：javascript复制

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class Solution {
public:
    ListNode* deleteDuplicates(ListNode* head) {
        ListNode* result=new ListNode(0);
        ListNode* pre=result;
        pre->next=head;
        while(head && head->next)
        {
            if(head->val!=head->next->val)
                pre=pre->next;
            else
            {
                while(head->next!=NULL)
                {
                    if(head->val!=head->next->val) break;
                    head=head->next;
                }
                pre->next=head->next;
            }
            head=head->next;
        }
        return result->next;
    }
};

distinct list nodes numbers return

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