Leetcode 203 Remove Linked List Elements

Remove all elements from a linked list of integers that have value val.

Example
Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6
Return: 1 --> 2 --> 3 --> 4 --> 5
删除链表里的指定元素。
简单题，不做复杂解释了

/**
* 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) {
ListNode* p = new ListNode(-1);
p->next = head;
ListNode* q = p;
while(p->next)
{
if(p->next->val == val)
p->next = p->next->next;
else
p = p->next;
}
return q->next;
}
};