Leetcode | 83 Remove Duplicates from Sorted List

Remove Duplicates from Sorted List(删除排序链表中的重复元素)

题目：链接

/**
 * 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) 
    {
        if(head == nullptr)
            return head;
        ListNode *pre = head;
        ListNode *newnode = head->next;
        while(newnode)
        {
            if(newnode->val == pre->val)
            {
                newnode = newnode->next;
                pre->next = newnode;
            }
            else
            {
                pre = newnode;
                newnode = newnode->next;
            }
        }
        return head;        
    }
};