Leetcode | 203 Remove Linked List Elements

Remove Linked List Elements(删除链表中的节点)

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* removeElements(ListNode* head, int val) 
    {
        if(head == nullptr)
            return head;
        ListNode * newnode = new ListNode(0);
        newnode->next = head;
        ListNode *pre = newnode;
        while(pre->next)
        {
            if(pre->next->val == val)
                pre->next = pre->next->next;
            else
                pre = pre->next;
        }
        return newnode->next;
    }
};