2095_DeletetheMiddleNodeofaLinkedList

---

title: 2095. Delete the Middle Node of a Linked List tags:
- Linked List - Two Pointers categories: leetcode comments: false

problem

solution

• two round

• one round

class Solution {
public:
    ListNode* deleteMiddle(ListNode* head) {
        if(!head->next) return nullptr;
        ListNode * pre = head, * slow = head, *fast = head;
        while(fast && fast->next){
            pre = slow;
            slow = slow->next;
            fast = fast->next->next;
        }
        pre->next = slow->next;
        return head;
    }
};s

analysis

• time complexity O(n)
• space complexity O(1)