/**
 * struct ListNode {
 *	int val;
 *	struct ListNode *next;
 *	ListNode(int x) : val(x), next(nullptr) {}
 * };
 */
class Solution {
public:
    /**
     * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可
     *
     * 
     * @param head ListNode类 
     * @param val int整型 
     * @return ListNode类
     */
    ListNode* removeElements(ListNode* head, int val) {
        ListNode* dummy = new ListNode(0);

        dummy->next = head;

        ListNode* cur = dummy;

        while(cur->next != nullptr){
            // 如果相同则删除相应的节点
            if(cur->next->val == val){
                ListNode* rm = cur->next;
                cur->next = rm->next;
                delete rm;
            }else{
                // 否则看下一个节点
                cur = cur->next;
            }
        }
        ListNode* newhead = dummy->next;
        delete dummy;
        return newhead;
    }
};