static boolean hasCycle(SinglyLinkedListNode head) {
        if (head == null) {
            return false;
        }
        
        SinglyLinkedListNode slow = head;
        SinglyLinkedListNode fast = head;
        
        while (fast != null && fast.next != null) {
            slow = slow.next;
            fast = fast.next.next;
            
            if (slow.equals(fast)) {
                return true;
            }
        }
        
        return false;
    }