Same problem was happened with me. I thought my solution was leaked from hacking room by another coder. Recently this problem is most and they leaked code from hacking room to any platform for money purpose may be. Frankly all of matching profile is may be fake because majority of them solved too less problem. May be they used this type of account for solution leaking. link : https://mirror.codeforces.com/blog/SleepOrSmile

Honestly i don't know this person. why i will share my code? May be some one share my code from my hacking room to this guy as he submit same code like myself. It is too shameful.

Auto comment: topic has been updated by return_toSleep (previous revision, new revision, compare).