Hi Ugo,
you are completely right that some of the topics presented in class were not covered by the programming exercises. In fact, this is also one of the reasons why the last exercise session will be devoted to answering any questions you might have regarding the content of the whole course. Each student might want to discuss different topics so to facilitate your preparation for the final exam, we will leave the last exercise open for you to choose what to discuss. If you feel like you would like to get more clarification on trees, feel free to prepare your questions and discuss with the TAs.
Jan
