？ @[fire_star](/user/1339989)
by is_laofang @ 2024-09-28 18:48:03
@ is_laofang
https://www.luogu.com.cn/problem/P2947
by fire_star @ 2024-09-28 19:42:38
三倍
还有个p2251 @[fire_star](/user/1339989)
by fairfriendZ @ 2024-10-13 17:16:31
@[fairfriendZ](/user/862865) yes
by fire_star @ 2024-10-14 16:57:09