It is a violation of AtCoder's Terms of Service to have more than one account that can participate in a contest, unless you have special permission to do so. It is also cheating to share answers during the contest. Both of these actions are subject to account suspension, and we have already suspended some accounts. Currently, we are only suspending accounts of malicious users. If you have more than one account, please cancel your membership as soon as possible. Please continue to enjoy AtCoder! Thanks!