Thank You for your time.
It is a very standard yet amazing problem in C and I'll be glad to help.
I have a great deal of experience in general Computer Science and Java, C, C++ Programming (5+ years).
Computer Science from IIT Delhi (Ranked under 100 globally). I'm also a professional competitive programmer on CodeForces, ranked Master 'Orange'.
It can be done in approximately 2-3 days. If you need it urgently we can talk.
The price is negotiable.