小明在 $X$ 星球的城堡中发现了如下图形和文字：

rank=3
   * 
  * * 
 *   *  
* * * *

rank=5
               *                                                      
              * *                                                     
             *   *                                                    
            * * * *                                                   
           *       *

<div class="cy-guest-lock" data-cy-guest-lock="1">
  <div class="cy-guest-lock__inner">
    <div class="cy-guest-lock__icon">🔒</div>
    <div class="cy-guest-lock__text">登录后查看完整题面</div>
    <a class="cy-guest-lock__btn" href="/login" rel="nofollow" >登录后查看题目</a>
  </div>
</div>