LeetCode 203. 移除链表元素

原题链接

class Solution {
public:
    ListNode* removeElements(ListNode* head, int val) {
     auto dummy = new ListNode(-1);
        dummy->next = head;
        for (auto p = dummy; p; p = p->next) {
            auto q = p->next;
            while (q && q->val == val) q = q->next;
            p->next = q;
        }
        return dummy->next;
    }
};