@admin I want to give my suggestion to Codechef team too as many had given to add an inbuilt compiler on Codechef site. Now i want to add one more thing in this is the place where the compiler should be added. In present situation when we press Submit button from any question page we are redirected to a new page where there’s only a textarea to paste code and upload a file options. In place of this you can add a compiler window in which one can write source code, compile it, and submit it from there. Reason for suggesting to give compiler on submit page is I like current interface of Codechef and don’t want any changes in it. In this way programmers will not go to any online compiler like Ideone for writing and testing their code.
PS: it’s just a suggestion. If you implement it I would to very happy.