I'm back, inspired by I_love_tigersugar!
Here are the first two cheaters: dantish and KasperI.
Here are their submissions, I don't think it's hard to see they do not differ much. ;)
8960588, 8970284.

Hello.
It's time to continue my justice work.
Here are the first two cheaters — yevhenii44 and Mem4ik.
Compare their submissions — 8653684 and 8656628.
I hope you're happy and proud to see your nicknames in my post, guys.

Hello.
Today's heroes are sal13 and slrohit.
These solutions are quite similar, aren't they?
8316418 | 8316139

Update.
Two more cheaters found.
They are akxxsb and WID.
8313907 | 8315725

Update.
Two more.
They are zenghui and limuyang01.
8315924 | 8315911.

Dear administration, I suggest you to do the following:
1. Ban accounts of people, who copied others' solutions.
2. Warn people, who gave their solutions to another people.
Current list of accounts to ban: sal13, slrohit, WID, zenghui.
Current list of people to warn: akxxsb, limuyang01.

This information can be wrong, I divided them into groups according to submit time and there's no guarantee that I have found all people with identical solutions. At least warn all of these people, please.