castle 给出一个城堡的地图，求其中的连通房间数，最大房间的面积，拆除某个墙壁连通两间屋子后可形成的最大房屋面积。应用pascal的递归函数来实现计算功能。-give a castle map of the castle, and one of the connectivity number of rooms, the largest area of the room, the removal of a wall connecting the two rooms can be formed