nth_element

public int findNthLinkedList(Node head, int n) {
    Node runner = head;
    Node walker = head;

    for (int i = 0; i < n; i++){
        runner = runner.next;
    }
    if (runner == null) return head.next.data;

    while (runner != null){
        runner = runner.next;
        walker = walker.next;
    }
    return walker.data;
}