week 8

Node findJoinNode(Node n1, Node n2) {
        Node p1 = n1;
        Node p2 = n2;
        boolean flipped1 = false;
        boolean flipped2 = false;
        while (p1 != null && p2 != null) {
            if (p1 == p2) {
                return p1;
            }
            if (p1.next == null) {
                if (flipped1) {
                    break;
                }
                flipped1 = true;
                p1 = n2;
            } else {
                p1 = p1.next;
            }

            if (p2.next == null) {
                if (flipped2) {
                    break;
                }
                flipped2 = true;
                p2 = n1;
            } else {
                p2 = p2.next;
            }
        }

        return null;
    }