$4^4*N$ 暴力总会打吧。
$4^4$ 枚举每个人坐哪里，O(N）判断是否合法。
by Custlo0793 @ 2021-01-17 13:31:01
主页双贴，危
by BADFIVE @ 2021-01-17 13:31:40
主页双贴，危
by Stinger @ 2021-01-17 13:32:21
求代码
by wlytfboys @ 2021-01-17 13:54:07
打一个dfs回溯就行了，还有请不要把你作业放上洛谷
by _caiji_ @ 2021-01-17 14:34:40