What should I do

Revision en1, by ballpoint_pen, 2023-04-22 07:17:46

I received a letter from Codeforces recently. It told me someone logged into my account.I searched the given IP and found that it came from Singapore,but I lived in China. I changed my password immediately. Who's that and what should I do?

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en1 English ballpoint_pen 2023-04-22 07:17:46 255 Initial revision (published)