203. Remove Linked List Elements

class Solution {
public:
    ListNode* removeElements(ListNode* head, int val) {
        ListNode* Head=new ListNode(-1);
        Head->next=head;
        ListNode* cur=head,*pre=Head;
        while(cur)
        {
            if(cur->val==val)
            {
                pre->next=cur->next;
                delete cur;
                cur=pre->next;
            }
            else
            {
                pre=cur;
                cur=cur->next;
            }
        }
        head=Head->next;
        delete Head;
        return head;
    }
    
};