in standings you can clearly see that I have completed Problem B in just 12 minutes and the warning message/mail sent by system contains such participants who has mostly lower than my rating and they have submitted code after my submission.I think that Codeforces should add some features such that participants in same room can not leak the code of other after submitting it .

I have attached the picture of my room too for your reference...

I hope that Codeforces team will look into this and try to improve the leakage of codes in same room by either removing hacking feature or something else by which other participant in the room can't copy the code ...