{"problem":{"name":"[NOIP 2001 普及组] 求先序排列","description":{"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$）。 ","description_type":"Markdown"},"platform":"Luogu","limit":{"time_limit":1000,"memory_limit":128000},"difficulty":{"LuoguStyle":"P2"},"is_remote":true,"is_sync":true,"sync_url":null,"sign":"LGP1030"},"statements":[{"statement_type":"Markdown","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\n## Input\n\n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\n## Output\n\n共一行一个字符串，表示一棵二叉树的先序。\n\n[samples]\n\n## Note\n\n**【题目来源】**\n\nNOIP 2001 普及组第三题","is_translate":false,"language":"English"}],"meta":{"iden":"LGP1030","tags":["字符串","树形数据结构","2001","递归","NOIP 普及组","深度优先搜索 DFS"],"sample_group":[["BADC\nBDCA\n","ABCD\n"]],"created_at":"2026-03-03 11:09:25"}}