Updates on curtailing plagiarism

I want to report a user on CodeChef who copied solutions from YouTube videos during the Starters 118 Division 4.

He has copied this solution:CodeChef: Practical coding for everyone completely 100% from this YouTube video: https://www.youtube.com/watch?v=qbXMINfMU4o

He has copied this solution:CodeChef: Practical coding for everyone completely 100% from this YouTube video: https://www.youtube.com/watch?v=UgonrTQG7VI

He has copied this solution:CodeChef: Practical coding for everyone completely 100% from this YouTube video: https://www.youtube.com/watch?v=XMxyuctlT6Y

He has copied this solution: CodeChef: Practical coding for everyone completely 100% from this YouTube video: https://www.youtube.com/watch?v=WJgosI3YWTE

His solution: CodeChef: Practical coding for everyone is not 100% copied but very similar to the solution shown in the YouTube video: https://www.youtube.com/watch?v=KFMc9x5OXNY

All of these videos were published while the contest was going on CodeChef, that is around 9 PM IST. He also changed his coding language from C++ to Python during the contest which is also suspicious.
@admin