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Instead of posting here search on net.
it is not possible to find if someone has copied from another if they change there variable names simple enough.nobody will find out whether it is codechef or codevita.
What does it mean? Plagiarism detector can detect variable changes.
How can you be so sure?
no it cant try it yourself in a codechef running challenge it will pass two same solutions by just variable change.and all cheating testers are more or less same.
But codevita is different from codechef they may use different tools?