College project in Data Structures/C++ - Simple program

Need a simple program for a college project. It's not complicated or anything, but it has to be done with Data Structures in mind (that's the subject), so it should be optimized around that. Again, it should be quite simple for anyone knowing how to code in c++ (I don't), but i has to be delivered within one week. Also, it shall be delivered with its source code (which must contain numerous comments in it), and a brief doc concerning the techniques followed during development, and why that specific data structure (for example, binary tree) was chosen.