I cannot login by GMAIL on my phone, and my PC (firefox). Now, I am using chrome on my PC because its cookie still valid, but I don't know when will it expire. Anyone encounter the same problem? This should be codeforces' issue that I cannot do anything?
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This happens with me as well, at that time I just login using my Gmail address and password. Don't have a password because you always used to authenticate through gmail? Just click on forget password
Thank you, I will have a try after my cookie expired..