data structure c++

Need 1 simple program for a college project. It's not complicated, but it has to be done with Data Structures in mind (that's the subject), so it should be optimized around that. It should be quite simple for anyone knowing how to code in c++, and it has to be delivered within 30 hours. 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. p.s. The exact subject of the project will be provided via pm after you bid.