QOJ.ac

QOJ

Announcements
IOI 2026 China Team Selection: Current Scoreboard, Tasks & Prediction Game by Qingyu 2025-12-04 18:50:36
The 3rd Universal Cup Finals: Call for tasks by Qingyu 2025-11-21 03:33:29
若还想与我相见 by Qingyu + ucup-team001 2025-05-12 16:11:05
QOJ Change logs (2025 Dec) 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……

Top solved

#UsernameMottoSolved
1hos_lyric$$\left[\frac{x^n}{n!} q^{K-1}\right] \frac{(\mathrm{e}^{rx} - 1) (q + r + \mathrm{e}^{rx} + q \mathrm{e}^{rx} - r \mathrm{e}^{rx} + 1)}{(q + 1) (r - \mathrm{e}^{2rx} + r \mathrm{e}^{2rx} + 1)}$$2261
2xiaowuc1you're a half a world away, but in my mind I whisper every single word you say2224
3qiuzx1946
4ucup-team47441532
5jiangly1242
6bachbeo20071212
7ucup-team1005=================== ↑ 业余门槛 ↑ =================== 1129
8ucup-team0871075
9CrysflyUOJ Round ~~缺投~~ 已倒闭 || www.cnblogs.com/Rainbowsjy1066
10angletrisection1052

Top contributors

#UsernameMottoAuthored Problems
1bulijiojiodibuliduo133
2quailty128
3TsReaper126
4clrs97105
5ElegiaI've been a fool to myself - I thought that I could live for no one else103
6nzhtl147782
7xiaowuc1you're a half a world away, but in my mind I whisper every single word you say77
8zimpha69
9Qingyu你是我的阳光62
10jiry_258