LeetCode 2095: Delete the Middle Node of a Linked List Solution

Master LeetCode problem 2095 (Delete the Middle Node of a Linked List), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2095. Delete the Middle Node of a Linked List

Medium

Linked List Two Pointers

Problem Explanation

Explanation

To delete the middle node of a linked list, we can use the two-pointer technique where one pointer moves one node at a time (slow pointer) and another pointer moves two nodes at a time (fast pointer). When the fast pointer reaches the end of the list, the slow pointer will be at the middle node. We can then remove this middle node by adjusting the pointers accordingly.

Solution Code

class ListNode {
    int val;
    ListNode next;
    ListNode(int val) {
        this.val = val;
    }
}

class Solution {
    public ListNode deleteMiddleNode(ListNode head) {
        if (head == null || head.next == null) {
            return null;
        }

        ListNode dummy = new ListNode(-1);
        dummy.next = head;
        ListNode slow = dummy;
        ListNode fast = dummy;

        while (fast != null && fast.next != null) {
            slow = slow.next;
            fast = fast.next.next;
        }

        slow.next = slow.next.next;

        return dummy.next;
    }
}

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