Today I checked standings in Codeforces Round 967 (Div.2). But I found some abnormal things.

This accout: https://mirror.codeforces.com/profile/ThMinh_, have a very good performance. But unusually, he got AC D in 31 mins, E1 in 2 mins later. So I was checked his submissions. And I found out that (may be) there are three people doing this contest in this account.

Why? Checking some submission's style code: 1. https://mirror.codeforces.com/contest/2001/submission/277328121, https://mirror.codeforces.com/contest/2001/submission/277350871 2. https://mirror.codeforces.com/contest/2001/submission/277358976, https://mirror.codeforces.com/contest/2001/submission/277368984 3. https://mirror.codeforces.com/contest/2001/submission/277360719

So is this legit? And if not, please abort him.

Sorry if my English is bad.

At least, TrendBattles orz.