leetcode876

class Solution {
public:
    ListNode* middleNode(ListNode* head) {
        if (head == NULL)
        {
            return nullptr;
        }
        vector<ListNode*> List;
        List.push_back(head);
        int count = ;
        while (head->next != NULL)
        {
            ListNode* n = head->next;
            List.push_back(n);
            head = head->next;
            count++;
        }
        return List[count / ];
    }
};