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	1563
2	hos_lyric	$$\left[\frac{x^n}{n!} q^{K-1}\right] \frac{(\mathrm{e}^{rx} - 1) (q + r + \mathrm{e}^{rx} + q \mathrm{e}^{rx} - r \mathrm{e}^{rx} + 1)}{(q + 1) (r - \mathrm{e}^{2rx} + r \mathrm{e}^{2rx} + 1)}$$	1562
3	ucup-team1005	If Natsuhi Kage (Qiyu Feng, Jianing Liu, Zemu Zhu) haven't solved a problem today, please DM ucup-team4744 with "夏日影加训！！！" Current Solved: 679; Last Solved at 2025-03-16 10:08:08.	1130
4	qiuzx		1033
5	maspy	Universal Cup Upsol部	992
6	larryzhong		983
7	Crysfly	UOJ.ac 缺投 \|\| www.cnblogs.com/Rainbowsjy	832
8	ucup-team004		823
9	PetroTarnavskyi	Why haven't you registered at https://algotester.com/en yet? 🤨	806
10	ucup-team087		766
11	zhouhuanyi		761
12	ucup-team1878		683
13	ucup-team4744		679
14	SGColin	Love never fails.	673
15	PhantomThreshold		667
16	dXqwq	I can see the Light on you, You can see the Right on me	657
17	ckiseki	卷不动了	609
18	yellowbird	做满1000题，肝就对了	577
19	ucup-team2335		570
20	grass8cow		564
21	ucup-team159		561
22	ucup-team987		553
23	lmq26052003		543
24	ucup-team1004	方队akioi	541
25	275307894a		540
26	ucup-team1198		539
27	ship2077		535
28	ucup-team253		521
29	ucup-team1134		511
30	ucup-team191		498
31	ucup-team052		491
32	ucup-team130		471
33	SolitaryDream		462
34	ucup-team1209	我不是可爱小青鱼	442
35	ucup-team133		437
36	ucup-team138		436
37	ucup-team112		433
38	ucup-team2880		432
39	ucup-team025		426
39	ucup-team4645	Altale	426
41	ucup-team2818		419
42	rotcar07		410
43	ucup-team3519		402
44	LoverInTime	089年的树剖	401
45	ucup-team311		397
45	ucup-team3215		397
47	ucup-team134		395
48	ucup-team216		394
49	rotcar08		386
50	Qiuly	fendou	381
51	ucup-team864		379
52	flower		376
53	yhddd		374
54	hyforces	永远不够	369
55	nullptr_qwq		366
56	KKT89		360
57	bachbeo2007		355
58	MoRanSky	无论过去不问将来	337
59	propane	woshisb	326
60	ucup-team1123		324
61	ezteam1		323
61	waifuSenpai		323
63	NailongGroup		321
64	ucup-team121		320
65	lmeowdn	Even your existence takes the burden off my mind.	319
66	ucup-team173		318
67	ucup-team3407		316
68	ucup-team296		315
69	ucup-team3646		313
70	ucup-team266		312
71	rgnerdplayer		311
72	hydd	But are we all lost stars trying to light up the dark?	310
73	Lynkcat		309
74	ucup-team008		308
75	Sorting	ㅗ오ㅗ	304
76	ucup-team4435	Motto-motto	303
77	ucup-team055		299
78	DaiRuiChen007		298
79	ucup-team244		294
79	ucup-team3510		294
81	wsyear	笋子烧鸡	289
82	james1BadCreeper	他明白他明白我给不起	287
82	znstz		287
84	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
85	N_z_		284
85	ucup-team878		284
87	Z_301		282
88	zhaohaikun		278
89	ucup-team4125		275
90	chenxinyang2006		274
90	hhoppitree	$e^{i\pi}+1=0$	274
90	ucup-team1525		274
90	ucup-team5027	Benson's Identity: $$\dbinom{n}{2k}2^{2k}=\sum\limits_{i=0}^k(-1)^i\dbinom{n}{i}\dbinom{2n-2i}{2k-2i}$$	274
94	PlentyOfPenalty	高亮的是我们，我们是青鱼家军！	273
95	AFewSuns	$\displaystyle\sum_{n \geq 0}{(x+y)^n\frac{u^n}{n!}}=\sum_{k \geq 0}\frac{x}{x-kz}(x-kz)^k\frac{u^k}{k!}\sum_{l \geq 0}\frac{(y+kz)^l}{l!}u^l$	270
96	ucup-team003		268
97	ucup-team122		266
98	kevinyang		265
99	Forever_Young		263
100	Milmon	一只可爱的小老虎	260