Data Structures and Algorithms Lab Assignment no. 4


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CS 211 Data Structures and Algorithms Lab

Assignment no. 4
Objective To implement BST
Total marks 10

Penalty for violating
naming convention(s)
The objective of this assignment is to implement Binary Search Tree (BST).
Command-line argument:
Your program should receive a file (input file) as a command line argument.
Input file
The input file will be a text file where each line will be of any of the following format:
insert <number>, inorder, preorder, postorder, search <number>, minimum, maximum,
successor <number>, predecessor <number>, where <number> represents any
non-negative integer. The input will be given in such a way that, at any point in time, the BST
contains only distinct numbers.
The output must be in a file named ‘bst.txt’. Every line in the input file must have a
corresponding output line in bst.txt. The details are given below.
Command Meaning Output
insert <number> Insert <number> to
the BST
<number> inserted
inorder Do an inorder
traversal of the BST
Sequence of numbers (separated by
a white space) obtained by doing
inorder traversal / <empty-line> (if
BST is empty)
preorder Do a preorder
traversal of the BST
Sequence of numbers (separated by
a white space) obtained by doing
preorder traversal / <empty-line> (if
BST is empty)
postorder Do a post-order
traversal of the BST
Sequence of numbers (separated by
a white space) obtained by doing
postorder traversal / <empty-line> (if
BST is empty)
search <number> Search <number>
in the BST
<number> found / <number> not
minimum Obtain the
minimum number in
the BST
<minimum-number> / <empty-line>
(if BST is empty)
maximum Obtain the
maximum number
in the BST
<maximum-number> / <empty-line>
(if BST is empty)
successor <number> Obtain the
successor of
<number> in the
<successor> / <number> does not
exist / successor of <number> does
not exist (if <number> is the
maximum number)
predecessor <number> Obtain the
predecessor of
<number> in the
<predecessor> / <number> does not
exist / predecessor of <number>
does not exist (if <number> is the
minimum number)
You can follow your own pseudocode for implementing these functions. For example, we
know that a node can potentially be inserted at many places in a BST. But for this
assignment, it is required that the node should be inserted at the leaf.
● The program you submit should output bst.txt when run.
● The main file of your program should be named as <roll no>.<extension>, where roll
no. specifies your roll no. and the extension depends on the language you choose
(Usage of C is mandatory for this assignment). Ex: 200010001.c.
● Test well before submission. You may use the attached sample input file for testing.
The corresponding output file is also attached. We have some hidden inputs with us
to test your program. The mark you obtain is purely based on whether your program
correctly gives outputs for the hidden inputs.
● If your program has only a single source file, please submit the file as it is. If your
program has multiple source files, please submit your code as a zip file where the
name of the zip file should be your roll number. It is important that you follow the
input/output conventions exactly (including the naming scheme) as we may be doing
an automated evaluation. There will be a penalty of 5% (on the mark you deserve
otherwise) if you do not follow the naming conventions exactly.
● Follow some coding style uniformly. Provide proper comments in your code.
● Submit only through moodle. Submit well in advance. Any hiccups in the
moodle/internet at the last minute is never acceptable as an excuse for late
submission. Submissions through email or any other means will be ignored.
● Acknowledge the people (other than the instructor and TA) who helped you to solve
this assignment. The details of the help you received and the names of the people
who helped you (including internet sources, if applicable) should come in the
beginning of the main file as a comment. Copying others’ programs is a serious
offence and a deserving penalty will be imposed if found.
● To consider for the first evaluation without penalty, you have to submit your program
by the due date. If you submit after the due date but on or before the cut-off date,
there will be a penalty of 5% on the marks you deserve otherwise.
● If you do not submit by the cut-off date, your program will not be considered for the
first evaluation.
● We will do the first evaluation after the cut-off date. The marks you obtain will be
proportional to the number of correct lines in the output files. We will use the ‘diff’
program to check the differences between the correct output file and the output file
generated by your program. So, you may verify the correctness of the output file by
using the diff program with a sample output file before submission. (See the man
page of diff for more info).
● We will do the second evaluation later. This is for those who want to improve their
marks obtained in the first evaluation or who do not submit for the first evaluation.
There will be a penalty of 20% for those who are submitting for the second
evaluation. The details of the second evaluation will be shared later.

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