Miyakonano @ 2024-04-20 15:29:36
S到底=什么？？？？？？？？？？？？？？？？？？？？？？？？？？？？
by I_like_play_eggy @ 2024-04-20 15:54:55
阶乘：n!=1\times2\times3\times...\times n
by I_like_play_eggy @ 2024-04-20 15:55:06
@Miyakonano