hey everyone,

i'm in a data structures class and we have a end of semester project. the project is pretty open, and we have to come up with an interesting idea that he approves of. we have to use at least two of the data structures we learned in class in our program. below is the list of the data structures we learned over the course of the semester. i'm drawing a blank and can't come up with anything. anyone got any ideas for a good/interesting program? thanks!

array lists
linked lists
doubly linked lists
stacks
queues
priority queues
trees
binary search trees
heaps