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QOJ

Announcements
IOI 2026 中国国家集训队互测 Round 1 by Qingyu 2025-10-17 20:49:52
Qualification Rule of The 3rd Universal Cup Finals by Qingyu 2025-08-02 04:42:45
The 2025 ICPC World Finals Baku Prediction Game (Rules Updated for WF contest) by Qingyu 2025-07-25 14:11:22
若还想与我相见 by Qingyu + ucup-team001 2025-05-12 16:11:05
QOJ Change logs (2025 Jun) 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$$\left[\frac{x^n}{n!} q^{K-1}\right] \frac{(\mathrm{e}^{rx} - 1) (q + r + \mathrm{e}^{rx} + q \mathrm{e}^{rx} - r \mathrm{e}^{rx} + 1)}{(q + 1) (r - \mathrm{e}^{2rx} + r \mathrm{e}^{2rx} + 1)}$$2036
2xiaowuc1you're a half a world away, but in my mind I whisper every single word you say1794
3qiuzx1588
4ucup-team47441500
5ucup-team10051128
6bachbeo20071039
7CrysflyUOJ Round ~~缺投~~ 已倒闭 || www.cnblogs.com/Rainbowsjy1027
8maspyUniversal Cup Upsol部992
9angletrisection989
10larryzhong977

Top contributors

#UsernameMottoAuthored Problems
1bulijiojiodibuliduo130
2TsReaper120
3quailty110
4ElegiaI've been a fool to myself - I thought that I could live for no one else103
5clrs97101
6zimpha69
7xiaowuc1you're a half a world away, but in my mind I whisper every single word you say67
8Qingyu你的心愿我的心愿好像不一样61
9jiry_258
10ftiasch57