QOJ - QOJ.ac

уведомления
QOJ 更新日志	by Qingyu	2023-01-06 20:27:29
Petrozavodsk Summer 2021 Announcement	by QOJ_News	2021-07-30 15:33:46
XXII Open Cup 新闻合集 / 比赛列表合集	by Qingyu	2021-09-02 23:08:35
XXI Open Cup 新闻合集	by Qingyu	2020-09-29 15:47:48



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Server Status:

#	имя пользователя	Девиз	Задачи
/	Qingyu		5089
1	larryzhong		682
2	ZhaoZiLong		321
3	HuangHanSheng		311
3	MaMengQi		311
5	GuanYunchang		309
6	ZhangYiDe		302
7	hydd	Qingyu txdy! \| Who will guard the guardians? \| Solve more problems. \| 警惕境外势力入侵qoj	254
/	flower	sqytxdy!	244
8	Wu_Ren		187
9	repoman	$$\prod_{i=0}^{n-1} (1+q^iz) = \sum_{i=0}^n q^{i(i-1)/2}\binom ni_q z^i$$	174
10	Lenstar	orz Qingyu	157
11	Crysfly	$$f(x)=(\sum_{i=0}^{n-1}\frac{y_i}{(x-q^i)\prod_{j\ne i}(q^i-q^j)})\prod_{i=0}^{n-1}(x-q^i)$$	150
12	Sa3tElSefr		146
13	qwq	$\displaystyle \sum_{i=1}^n [i,i+1,\cdots, i+k] \pmod{10^9+7}$	145
14	feecle6418	gyh ak ioi	135
15	YaoBIG		126
16	He_Ren		118
17	JohnAlfnov	Qingyu Kedavra !	113
17	zombie462	<b>123</b>	113
19	alpha1022		110
19	not_so_organic	今晚九点，QYC 唱歌。	110