He gave you an entire week. That's more than enough time. C++ isn't extremely different from C#. If you have C++ questions, then post them back here, but don't ask for us to do your work.
If you think your professor is being unreasonable asking you to write code in C++, then write the successful solution in C# (to show that you actually did work on the assignment) along with a letter explaining why it's unreasonable to ask for a solution in C++ when the course is for C#. This would be better than getting expelled for copying someone else work.
