{"problem":{"name":"枚举排列（递归实现排列型枚举）","description":{"content":"今有 $n$ 名学生，要从中选出 $k$ 人排成一列拍照。 请按字典序输出所有可能的排列方式。","description_type":"Markdown"},"platform":"Luogu","limit":{"time_limit":1000,"memory_limit":131072},"difficulty":{"LuoguStyle":"P2"},"is_remote":true,"is_sync":true,"sync_url":null,"sign":"LGB3623"},"statements":[{"statement_type":"Markdown","content":"今有 $n$ 名学生，要从中选出 $k$ 人排成一列拍照。\n\n请按字典序输出所有可能的排列方式。\n\n## Input\n\n仅一行，两个正整数 $n, k$。\n\n## Output\n\n若干行，每行 $k$ 个正整数，表示一种可能的队伍顺序。\n\n[samples]\n\n## Note\n\n对于 $100\\%$ 的数据，$1\\leq k\\leq n \\leq 10$。","is_translate":false,"language":"English"}],"meta":{"iden":"LGB3623","tags":["深度优先搜索 DFS"],"sample_group":[["3 2","1 2\n1 3\n2 1\n2 3\n3 1\n3 2"]],"created_at":"2026-03-03 11:09:25"}}