[这是窝自己 ~~抄~~ 写的题解](https://cyaron.blog.luogu.org/solution-p2162)
by AquaRio @ 2019-10-09 09:08:17
群论。。。
by 一叶知秋。 @ 2019-10-09 09:33:11
# QNDMX
by 一叶知秋。 @ 2019-10-09 09:33:24
$S_{k}$ 是用 $k$ 种颜色染色的方案数（但不一定都用）
by OwenOwl @ 2019-10-09 09:41:56
@[OwenOwl](/space/show?uid=50882) 哦哦哦窝明白了 蟹蟹
by AquaRio @ 2019-10-09 09:46:09
@[OwenOwl](/space/show?uid=50882) 窝太菜了
by AquaRio @ 2019-10-09 09:46:31