C++ Implementation of AVL Trees (worth 10%, due Sept 30th
23:59PM, late submissions not accepted)
Mingyu Guo
1 Task Description
You are asked to use C++ to implement
Binary Tree Traversal
AVL Tree Insertion and Deletion
2 Submission Guideline
You must follow this guideline! Your submission will be marked automatically. Failure to
follow this guideline will result in 0.
Your submission should contain exactly one le: main.cpp
You do not need to submit a design.
There are be di erent versions of AVL trees. You should implement the one speci ed on the slides (e.g.,
when you delete a node with two children, swap the value with the largest value on the left).
You should start your program by initializing an empty AVL tree. Your program takes one line as
input. The input line contains n \modi cation moves" separated by spaces (1 n 100). The available
modi cation moves are
Aint (Character A followed by an int value between 1 and 100): A3 means insert value 3 into the AVL
tree. If 3 is already in the tree, do nothing.
Dint (Character D followed by an int value between 1 and 100): D3 means delete value 3 into the AVL
tree. If 3 is not in the tree, do nothing.
Your input is then followed by exactly one nishing move (PRE or POST or IN): If the nishing move is
PRE, then you should print out the tree (in its current situation) in pre-order. If the tree is empty, print out
EMPTY. Otherwise, print out the values separated by spaces. POST and IN are handled similarly.
You don’t need to worry about invalid inputs.
Sample input 1: A1 A2 A3 IN
Sample output 1: 1 2 3
Sample input 2: A1 A2 A3 PRE
Sample output 2: 2 1 3
Sample input 3: A1 D1 POST
Sample output 3: EMPTY
3 Marking
Marking will be done automatically. There are 100 test cases.
1
4 SVN Instructions
First of all, you need to create a directory under version control:
svn mkdir --parents -m "Creating ADSA Assignment 2 folder" https://version-control.adelaide.edu.au/svn/aXXXXXXX/2018/s2/adsa/assignment2/
aXXXXXXX should be your student ID. The directory path needs to be exactly \2018/s2/adsa/assignmentK",
where \K" is the assignment number. To check out a working copy, type
svn checkout https://version-control.adelaide.edu.au/svn/aXXXXXXX/2018/s2/adsa/assignment2/ adsa-18-s2-assignment2/
cd adsa-18-s2-assignment2
svn add main.cpp
Commit the les to SVN:
svn commit -m "Adding ADSA assignment 2 main.cpp"
SVN helps keeping track of le changes (over di erent commits). You should commit your work early and
often.
5 Websubmission
You are asked to submit via the web interface https://cs.adelaide.edu.au/services/websubmission/.
The submission steps should be self-explanatory. Simply choose the correct semester, course, and assignment.
The websubmission system will automatically fetch the latest version of your work from your SVN repository
(you may also choose to submit older versions). Once your work is submitted, the system will launch a
script. checking the format of your submission. Click \View Feedback" to view the results. Your mark will
be calculated o ine after the deadline. You are welcome to resubmit for as many times as you wish (before
the deadline).
We will compile your code using g++ -o main.out -std=c++11 -O2 -Wall main.cpp. It is your re-
sponsibility to ensure that your code compiles on the university system.1
1g++ has too many versions, so being able to compile on your laptop does not guarantee that it compiles on the university
system. You are encouraged to debug your code on a lab computer (or use SSH).