QOJ.ac

QOJ

#	Username	Motto	Solved
1	xiaowuc1	you're a half a world away, but in my mind I whisper every single word you say	1307
2	hos_lyric	$$\left[\frac{x^n}{n!} q^{K-1}\right] \frac{(\mathrm{e}^{rx} - 1) (q + r + \mathrm{e}^{rx} + q \mathrm{e}^{rx} - r \mathrm{e}^{rx} + 1)}{(q + 1) (r - \mathrm{e}^{2rx} + r \mathrm{e}^{2rx} + 1)}$$	1184
3	ucup-team1005	沉舟侧畔千帆过	1035
4	larryzhong		983
5	PetroTarnavskyi	Why haven't you registered at https://algotester.com/en yet? 🤨	798
6	Crysfly	我还能为你驻足到何时	679
7	zhouhuanyi		676
8	PhantomThreshold		669
9	ckiseki	卷不动了	608
10	qiuzx		603
11	ucup-team2335		562
12	dXqwq	To the cosmic	549
13	ucup-team004		545
14	lmq26052003		534
15	grass8cow		525
16	ucup-team087		517
17	ucup-team1198		515
18	SolitaryDream		462
19	ucup-team052		458
20	ucup-team1878		446
21	ucup-team1209	我不是可爱小青鱼	442
22	maspy	Universal Cup Upsol部	433
23	ucup-team2880		431
24	LoverInTime	089年的树剖	401
25	ucup-team1004	方队akioi	397
26	275307894a		395
27	ship2077		383
28	flower		377
29	hyforces	永远不够	366
30	ucup-team159		364
30	ucup-team987		364
32	Kevin5307	$$ \frac{1}{1-x}\sum_{k=1}^\infty\frac{x^k}{1-\frac{x-x^{k+1}}{1-x}} $$	361
33	bachbeo2007		349
34	ucup-team191		343
35	ucup-team864		340
36	MoRanSky	无论过去不问将来	337
37	ucup-team1134		332
38	ucup-team130		322
38	ucup-team253		322
40	ucup-team133		319
41	lmeowdn		316
41	waifuSenpai		316
43	hydd	Qingyu txdy $\\$ If my armor breaks, I'll fuse it back together	310
44	Lynkcat		300
45	Sorting	ㅗ오ㅗ	299
46	ucup-team138		290
46	ucup-team266		290
48	ucup-team025		289
48	ucup-team112		289
50	james1BadCreeper	他明白他明白我给不起	287
51	alpha1022	$$\frac{1}{n_1!n_2!}(1-y)^{n_1+n_2+2} \left(\sum_{j\ge 0} y^j(t+j)^{n_1} \right) \left(\sum_{j\ge 0} y^j((j+1)-t)^{n_2} \right)$$	286
52	znstz		278
53	AFewSuns	$\displaystyle\sum_{n \geq 0}{(x+y)^n\frac{u^n}{n!}}=\sum_{k \geq 0}\frac{x}{x-kz}(x-kz)^k\frac{u^k}{k!}\sum_{l \geq 0}\frac{(y+kz)^l}{l!}u^l$	269
54	ezteam1		267
54	ucup-team311		267
56	ucup-team1525		266
57	ucup-team1447	没队要	262
58	ucup-team216		260
59	ucup-team180		257
59	zhaohaikun		257
61	tricyzhkx		250
62	ucup-team2307		247
63	KKT89		246
63	ucup-team244		246
65	ucup-team267	哈姆。	242
66	ucup-team122		241
66	zhoukangyang		241
68	ucup-team134		240
69	iee		238
70	He_Ren		237
70	sdoi	$$P_{a_i}(x) = [t^{a_i}]\frac{1}{1-xF(t)}$$	237
72	ucup-team3215		234
73	8BQube		222
74	chenshi		221
75	karuna		220
75	kevinyang		220
77	ucup-team2818		219
78	repoman	$$\prod_{i=0}^{n-1} (1+q^iz) = \sum_{i=0}^n q^{i(i-1)/2}\binom ni_q z^i$$	215
78	ucup-team870		215
78	ushg8877		215
81	ucup-team1293		214
82	ucup-team1123		213
83	ucup-team228		211
84	JohnAlfnov	Qingyu Kedavra !	210
84	PlentyOfPenalty	高亮的是我们，我们是青鱼家军！	210
86	chenxinyang2006		208
86	ucup-team3519		208
88	do_while_true		203
88	new_dawn_2		203
90	DaiRuiChen007		202
90	ucup-team045		202
92	Forever_Young		201
92	Max_s_xaM		201
92	ucup-team1002		201
92	ucup-team123		201
96	rgnerdplayer		199
96	ucup-team1126		199
98	qwq	$\displaystyle \sum_{i=1}^n [i,i+1,\cdots, i+k] \pmod{10^9+7}$	198
99	ucup-team029		197
100	ucup-team008		196