大佬出公开赛
by xzy062609 @ 2020-02-17 21:52:50
orz
by FZzzz @ 2020-02-17 21:53:15
@[QAQ——QAQ](/user/81698) 所以您见过吗
by JohnVictor @ 2020-02-17 21:53:27
$\mathfrak{stOrz dalao}$
by xhQYm @ 2020-02-17 21:53:56
见过的说啊，不要水啊
by JohnVictor @ 2020-02-17 21:53:58
¡lbʇ
by libra9z @ 2020-02-17 21:54:31
~~公然贩毒~~
by 断清秋 @ 2020-02-17 22:00:21
@[JohnVictor](/user/254752)
LOJ 上有这题
by ix35 @ 2020-02-17 22:08:21
@[JohnVictor](/user/254752)
确实是原题
$n-x(\sum\limits_{i=1}^n ln(1-a_ix))'$
by 糯米w @ 2020-02-17 22:10:41
@[JohnVictor](/user/254752) 见 [P4705](/problem/P4705)
by Aleph1022 @ 2020-02-17 22:27:47