04_MiddleOfLinkedList.java

// Problem: Middle of Linked List
// Author: Ataul (codeByunique)

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

class MiddleOfLinkedList {
    public static void main(String[] args) {
        // Linked List: 1 → 2 → 3 → 4 → 5
        ListNode head = new ListNode(1);
        head.next = new ListNode(2);
        head.next.next = new ListNode(3);
        head.next.next.next = new ListNode(4);
        head.next.next.next.next = new ListNode(5);

        ListNode mid = middleNode(head);
        System.out.println("Middle Node: " + mid.val);
    }

    public static ListNode middleNode(ListNode head) {
        ListNode slow = head;
        ListNode fast = head;

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

        return slow;
    }
}