dfs即可 @[IOI_officialaccount](/user/964579)
by mysterys @ 2024-03-09 09:54:40
@[IOI_officialaccount](/user/964579) $9$ 的全排列不是 $9$ 吗（
by QWQ_123 @ 2024-03-09 09:54:45
@[IOI_officialaccount](/user/964579) 猜你想要 <https://blog.csdn.net/chen_wen_jun/article/details/109553952>
next_permutation 是个好东西
@[mysterys](/user/659165) 没必要写 dfs
by QWQ_123 @ 2024-03-09 09:55:24
@[QWQ_123](/user/740328) 关猪了
by IOI_officialaccount @ 2024-03-09 10:01:55