{"raw_statement":[{"iden":"statement","content":"给出一棵二叉树的中序与后序排列。求出它的先序排列。（约定树结点用不同的大写字母表示，且二叉树的节点个数 $ \\le 8$）。\n"},{"iden":"input","content":"共两行，均为大写字母组成的字符串，表示一棵二叉树的中序与后序排列。\n"},{"iden":"output","content":"共一行一个字符串，表示一棵二叉树的先序。\n"},{"iden":"note","content":"**【题目来源】**\n\nNOIP 2001 普及组第三题"}],"translated_statement":null,"sample_group":[["BADC\nBDCA\n","ABCD\n"]],"show_order":[],"formal_statement":null,"simple_statement":null,"has_page_source":false}