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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
 
 
 
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Top solved

#UsernameMottoSolved
1hos_lyric$$\left[\frac{x^n}{n!} q^{K-1}\right] \frac{(\mathrm{e}^{rx} - 1) (q + r + \mathrm{e}^{rx} + q \mathrm{e}^{rx} - r \mathrm{e}^{rx} + 1)}{(q + 1) (r - \mathrm{e}^{2rx} + r \mathrm{e}^{2rx} + 1)}$$1659
2xiaowuc1you're a half a world away, but in my mind I whisper every single word you say1582
3ucup-team1005Natsuhi Kage (Qiyu Feng, Jianing Liu, Zemu Zhu) Solved: 859; Last Solved at 2025-04-28 15:27:42 (57 minutes ago)1129
4qiuzx1095
5maspyUniversal Cup Upsol部992
6larryzhong981
7ucup-team004910
8ucup-team4744859
9Crysfly$\Large\text{UOJ Round 缺投}$ || www.cnblogs.com/Rainbowsjy858
10PetroTarnavskyiWhy haven't you registered at https://algotester.com/en yet? 🤨806

Top contributors

#UsernameMottoAuthored Problems
1quailty106
2clrs9784
3bulijiojiodibuliduo81
4TsReaper80
5xiaowuc1you're a half a world away, but in my mind I whisper every single word you say60
6ftiasch46
7Elegia$R(T_1\oplus T_2) < R(T_1) + R(T_2)$43
7Qingyu偶像偶尔不会像43
9zimpha42
10tangjz39