设二叉树结点值为大写字母，输入二叉树的前序遍历和中序遍历序列，生成此二叉树，输出该二叉树的后序遍历和按层次遍历序列。输入某结点值，在二叉树中查找该结点，若该结点存在，则输出从根到该结点的路径，否则给出不存在信息。(A two fork tree node value is capitalized, and the preorder traversal and sequence traversal sequence of the two fork tree is input to generate