byteplay_studios was streaming on youtube during the contest : https://www.youtube.com/watch?v=8249xj-tyS0 and selling the solution to audiences. A lot of div2(not sure about div1) people cheated by copy-pasting their solution (Especially on div2 E/F) (I think they subscribed to the channel to get the copy)

vin_esh_32 AmmarAhmedTheSaviour huytriet210 Nathako9n KitKat_Cat Utsav_Kashyap Santhoshreddy18 nguyennhat182006 crazygmail.com 17070030370 I haven't finish reading all the solution by other people on F, but I am sure there will be more. Please ban them!!!