Method nthToLastR3Helper

java/Chapter 2/Question2_2/Question.java:30–42

(LinkedListNode head, int k)

	}
	
	public static Result nthToLastR3Helper(LinkedListNode head, int k) {
		if (head == null) {
			return new Result(null, 0);
		}
		Result res = nthToLastR3Helper(head.next, k);
		if (res.node == null) {
			res.count++;
			if (res.count == k) {
				res.node = head;
			} 
		}
		return res;
	}	
	
	public static LinkedListNode nthToLastR3(LinkedListNode head, int k) {
		Result res = nthToLastR3Helper(head, k);