@[NM_ljy](/user/688783) get函数要预处理阶乘和逆元，而且光速幂最好开long long 要不然容易挂
by sxy2012yutiti @ 2023-07-20 11:05:05
推销博客 [数论入门](https://www.luogu.com.cn/blog/590600/shuo-lun-ru-men)。
by Adchory @ 2023-07-20 11:27:42
@[MoriyaSuwako](/user/590600) 建议预处理求组合数
by Adchory @ 2023-07-20 11:29:03