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Assignment 8 Binary Trees

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Assignment 8
CS329E – Elements of Software Design
Binary Trees
(100 points)
1 Description
In this assignment you will be adding to the classes Node and Tree that we developed in Binary Search Tree
Lecture and testing them. There are several short methods that you will have to write.
• Write a method range() that returns the range of values stored in a binary search tree of integers. The
range of values equals the maximum value in the binary search tree minus the minimum value. If
there is one value in the tree the range is 0. If the tree is empty the range is undefined.
def range (self):
• Write a method get level() that takes as input the level and returns a list of all the nodes at that level
from left to right. If that level does not exist for that binary search tree return an empty list . Use the
convention that the root is at level 0.
def get level (self, level):
• Write a method left side view() when given the root of a binary tree, imagine yourself standing on the
left side of it, return the values of the nodes you can see ordered from top to bottom.
def left side view (self):
• Write a method sum leaf nodes() that returns the sum of the value of all leaves. Recall that a leaf node
does not have any children.
def sum leaf node (self):
In this assignment you will be writing helper methods for the Tree class that we developed and test them.
The following is the outline of the code that you will be submitting. You may include the other functions
that we developed for completeness.
Input:
In the class TestBinaryTree you will create several trees and show convincingly that your methods are
working. Here is an example of the file bst.in:
1 50 30 70 10 40 60 80 7 25 38 47 58 65 77 96
2 50 30 70 10 40 60 80 7 25 38 47 58 65 77 96
3 58 77 65 30 38 50 7 25 47 96 80 10 60 70 40
There should be enough documentation in your code that explains to the student assistants what you are
testing and how. The file that you will be turning in will be called TestBinaryTree.py.
1
Pair Programming
For this assignment you may work with a partner. Both of you must read the paper on Pair Programming1
and abide by the ground rules as stated in that paper. If you are working with a partner then only one of you
will be submitting the code. But make sure that your partner’s name and UT EID is in the header. If you are
working alone then remove the partner’s name and eid from the header.
1.1 Turnin
Turn in your assignment on time on Gradescope system on Canvas. For the due date of the assignments,
please see the Gradescope and Canvas systems.
1.2 Academic Misconduct Regarding Programming
In a programming class like our class, there is sometimes a very fine line between ”cheating” and acceptable
and beneficial interaction between students (In different assignment groups). Thus, it is very important that
you fully understand what is and what is not allowed in terms of collaboration with your classmates. We
want to be 100% precise, so that there can be no confusion.
The rule on collaboration and communication with your classmates is very simple: you cannot transmit
or receive code from or to anyone in the class in any way – visually (by showing someone your code),
electronically (by emailing, posting, or otherwise sending someone your code), verbally (by reading code to
someone) or in any other way we have not yet imagined. Any other collaboration is acceptable.
The rule on collaboration and communication with people who are not your classmates (or your TAs or
instructor) is also very simple: it is not allowed in any way, period. This disallows (for example) posting
any questions of any nature to programming forums such as StackOverflow. As far as going to the web and
using Google, we will apply the ”two line rule”. Go to any web page you like and do any search that you
like. But you cannot take more than two lines of code from an external resource and actually include it in
your assignment in any form. Note that changing variable names or otherwise transforming or obfuscating
code you found on the web does not render the ”two line rule” inapplicable. It is still a violation to obtain
more than two lines of code from an external resource and turn it in, whatever you do to those two lines after
you first obtain them.
Furthermore, you should cite your sources. Add a comment to your code that includes the URL(s) that
you consulted when constructing your solution. This turns out to be very helpful when you’re looking at
something you wrote a while ago and you need to remind yourself what you were thinking.
We will use the following Code plagiarism Detection Software to automatically detect plagiarism.
• Staford MOSS
https://theory.stanford.edu/˜aiken/moss/
• Jplag – Detecting Software Plagiarism
https://github.com/jplag/jplag and https://jplag.ipd.kit.edu/
1Read this paper about Pair Programming https://collaboration.csc.ncsu.edu/laurie/Papers/
Kindergarten.PDF
2

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