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class ListNode {
    int val;
    ListNode next;

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

public class LinkedListOperations {

    // Convert Array to Linked List
    public ListNode arrayToLinkedList(int[] arr) {
        if (arr == null || arr.length == 0) return null;

        ListNode head = new ListNode(arr[0]);
        ListNode current = head;

        for (int i = 1; i < arr.length; i++) {
            current.next = new ListNode(arr[i]);
            current = current.next;
        }

        return head;
    }

    // Count Nodes in Linked List
    public int countNodes(ListNode head) {
        int count = 0;
        ListNode current = head;

        while (current != null) {
            count++;
            current = current.next;
        }

        return count;
    }

    // Search in Linked List
    public boolean searchInLinkedList(ListNode head, int target) {
        ListNode current = head;

        while (current != null) {
            if (current.val == target) {
                return true; // Value found
            }
            current = current.next;
        }

        return false; // Value not found
    }

    // Helper Method: Print Linked List
    public void printLinkedList(ListNode head) {
        ListNode current = head;

        while (current != null) {
            System.out.print(current.val + " -> ");
            current = current.next;
        }
        System.out.println("null");
    }

    // Main Method: Test All Operations
    public static void main(String[] args) {
        LinkedListOperations operations = new LinkedListOperations();

        // Convert Array to Linked List
        int[] arr = {10, 20, 30, 40, 50};
        ListNode head = operations.arrayToLinkedList(arr);
        
        // Print Linked List
        System.out.print("Linked List: ");
        operations.printLinkedList(head);

        // Count Nodes
        int nodeCount =