QOJ - QOJ.ac

Announcements
The 2nd Universal Cup Finals Analysis（草稿）	by Qingyu✨	2025-03-03 16:39:06
IOI 2025 China Team Selection Statistics & Prediction by Qingyu	by Qingyu✨	2024-12-04 15:22:03
QOJ Change logs (2025 Mar)	by Qingyu✨	2023-01-06 20:27:29
Judging environment of QOJ (2025 updated)	by Qingyu✨	2021-03-23 20:32:30



All the Announcements……

#	Username	Motto	Solved
1	hos.lyric🐇	$\left[\frac{x^n}{n!} q^{K-1}\right] \frac{(\mathrm{e}^{rx} - 1) (q + r + \mathrm{e}^{rx} + q \mathrm{e}^{rx} - r \mathrm{e}^{rx} + 1)}{(q + 1) (r - \mathrm{e}^{2rx} + r \mathrm{e}^{2rx} + 1)}$	1590
2	xiaowuc1	you're a half a world away, but in my mind I whisper every single word you say	1563
3	Nemesis (Zonghan Yang, Mingchi Zhang, Jianjun Zhang)	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: 722; Last Solved at 2025-04-01 10:35:14.	1129
4	qiuzx		1047
5	maspy	Universal Cup Upsol部	992
6	larryzhong		982
7	jiangly (Lingyu Jiang)		864
8	Crysfly🌈	UOJ Round 缺投 \|\| UOJ NOI Round 缺投 \|\| www.cnblogs.com/Rainbowsjy	836
9	PetroTarnavskyi	Why haven't you registered at https://algotester.com/en yet? 🤨	806
10	HoMaMaOvO (Riku Kawasaki, Masaki Nishimoto, Yui Hosaka)		780

#	Username	Motto	Authored Problems
1	quailty		106
2	clrs97		84
3	bulijiojiodibuliduo		79
4	TsReaper		74
5	xiaowuc1	you're a half a world away, but in my mind I whisper every single word you say	60
6	ftiasch		46
7	zimpha		42
8	Elegia❄️	$R(T_1\oplus T_2) < R(T_1) + R(T_2)$	40
8	Qingyu✨	青色光	40
10	tangjz		39

View all