As a competition platform, we strictly enforce following policies, and request all users and participants follow the rules.

One person, one account

Each person shall only have one account. If you want to change your email or other information, please modify the existed account or contact us directly instead of registering a new one.

Limitation on submission per day

Each competition defines the maximum submissions per day. The limitation should be strictly followed. You cannot register multiple accounts to bypass the limitation.


Dishonesty acts include misusage of data and obtain submissions or prizes fraudulently. All users shall not try, by any mean, to obtain the answer or private training data of any competition. If the rule of one competition