*New
York University*

*Courant
Institute of Mathematical Sciences*

*Department
of Computer Science*

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*CS102
Data Structures*

*Topics,
Agenda, Syllabus and Learning Objectives*

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**Course Name** *CS102 Data Structures*

*CSCI-UA
102 005 007*

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**Instructor**

Prof. Anasse Bari

*Click here for details about Office Hours*

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**Tutoring
Hours**

Visit your CS102 tutors at: Tutoring Hours

**Recitations
Leader: **** **

Rafael Moraes** **

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**Course
Description**** **

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The subject of this course
is data structures and algorithms. A data structure is an arrangement of data
in a computer s memory (or sometimes in a disk). In this course, *you will learn
ways to structure and arrange data in computer s memory that includes arrays,
linked lists, stacks, trees, hashtables, and graphs*.
Algorithms manipulate that data in these structures in various ways, such as
searching for a data element and sorting a set of data elements. In this class
you will learn several concepts including how organize
data elements, how to delete, insert, edit and search for a data element in a
specific data structure and how to sort a set of data elements. You will also
learn the differences between different data structures and when to use the
right ones to solve problems.

An
engineer is constantly solving problems. ** You will be introduced in this
class to practical problems to solve using data structures** such as
utilizing data structures such as linked-lists, trees and arrays to implement a
course registration tool, storing and sorting courses and students information
data, modeling social network data using a graph data structure, and applying
sorting and graph algorithms to analyze social network data (e.g. potential
online community detection)

The
programming language adopted in this class is Java, at the beginning of the
semester ** you will have a review of the object oriented
programming paradigm** and some of its features such as inheritance,
abstraction, encapsulation and polymorphism.

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Course Notes** **

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Assignments

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Additional Online Resources

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Chapter Zero: Motivation in Learning Data Structures

**In
class brief discussion around programming, data structures, data science, big
data and the job market**** **

*Reading:
*Want to Work at Google or Facebook? Here s
What You Need to Know

Chapter One: Introduction to Data Structures

Objectives

Defining Data in the Context of Data Structures

Defining the term Algorithm in the Context of Data Structures

Defining the Concept of Data Structures

Outlining Examples of Data Structures

Defining the Need for Data Structures

Learning the basics of Algorithms Design

Learning how to Express Algorithms in Pseudo-code

Practicing Developing Algorithms in Pseudo-code

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Chapter Two: Review of the Object-Oriented Programming Paradigm

Sample code needed for HW1 on Simple File I/O and Serialization in Java

Sample Code discussed in class:

For Interfaces Coding Example see Practice Two

For Polymorphism Examples see Chapter Two notes on the Instrument, Drum, Horn Examples

Objectives
(*Review of 101s Part on OOP*)

Introducing the motivation behind the creation of the object-oriented paradigm

Learning the concept of the class, object (state, behavior and identity), and abstraction

Differentiating between the procedural programming paradigm and the object-oriented programming paradigm

The benefits of using the object-oriented paradigm

Introducing object, classes, constructors, getters, setters, member variables... by designing a phone book directory using the Object-Oriented Programming

Introducing immutable objects and classes

Learning the concept of variable scope, the this references

Introducing abstraction and encapsulation and object composition

Designing a stack class

Learning how to design a class and designing wrapper class for primitive data types

Introducing BigInteger and BigDecimal Classes

Introducing the concepts of encapsulation and inheritance

Learning the super keyword, superclass methods and data fields

Introducing the concept of polymorphism

Learning
how to use *interfaces* and *abstract classes* in Java

Introducing
the *comparable* java interface

Introducing
*casting* and *instance of*

Understanding when to use an interface or an abstract class

**Readings:** Chapter One from the Book

Additional Resources to Read:

What is Object Oriented Programming? By Andrew Virnuls

Chapter Five from the textbook is an assigned reading for this chapter.

**Attachment:** Binary Recursion Tree on *Finding Global Minimum*** **

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**Additional
Reading:** Introduction to Recursion, Eric Roberts (from page
176 to 184)

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Defining recursion

Understanding the motivation behind recursion

Introducing
recursion as a *problem-solving tool*

Learning the key principles behind recursion

Understanding the distinction between recursion and iterative based solutions

Learning recursion trough examples

Introducing the stack data structure as a support data structure for recursive calls

Understanding and applying recursive principles with binary recursion

Chapter Four: Algorithm Analysis and Big-O Notation

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Learning how to apply the proper analytical frameworks in examining the running time of algorithms

Defining algorithm analysis

Understanding the role of primitive operators

Understand Big-O notation and time complexity concepts

Chapter Five: Sorting and Searching Algorithms

**TED** talk to see: What's the fastest way to alphabetize your bookshelf? - Chand John

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Reviewing linear search and binary search

Introducing the big picture: the importance of sorting algorithms and their practical applications

Learning about major sorting algorithms (bubble sort, selection sort, insertion sort, merge sort and quick sort)

Practicing binary recursion through recursive sorting

Analyzing the running time of sorting algorithms using recurrence relations

Linked List Part II: Postfix, Infix, Queues and Stacks

Important take home practice exercise (no need to
submit it): *Write
a program to convert a infix notation into postfix
notation (you can follow the algorithm discussed in class and mentioned in the
Linked Lists Part II), also consider going the brackets problem in the notes
using a Stack.** *

Source code discussed in class and highly recommended to implement for your own review:

--

Generic types based Queue implemented as LinkedList

*Notice
that the implementation of the generic LinkedList LinkedList<node> and
its implementation along with the iterator class implementation are mentioned
in the slides form chapter 6.*

More on Lists from the source Oracle

*Chapter
Seven: Arrays and Array Lists (comparison to LinkedList) discussed in class*

A Quick Introduction to Graphs (A tree is a special case of a Graph)

Definition of Trees

Rooted Trees

Binary Trees

Binary Search Trees

Recursive Pseudo-code on Trees

Chapter
Eleven: The Choice of the Right Data Structure for the Right Problem *(Handout
distributed in class)*

**Sample
interview questions that are mainly based on algorithms and data structures:**

**Amazon
and Google interview questions about data structures:**** **

**Important
Online Sources:**** **

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What is Java? A Brief History about Java

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Top 25 Most Frequently Asked Interview Core Java Interview Questions and Answers

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Practice
Exercises and Solutions** **

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**Homework
One: University Course Registration System using OOP**

Sample code on Simple File I/O and
Serialization in Java

*Classes,
Objects, Inheritance, Polymorphism, Interfaces, Abstract Classes, Method
Overriding, File I/O, ArrayLists, Serialization and more
on Object-Oriented Paradigm*

**Deadline: check NYU Classes (submission by email will NOT be accepted) 15% off
per day after the deadline (4 days maximum).^{}**

**Learning
Objectives:**

Learning how to design and engineer a software solution
using the Object-Oriented Programming Paradigm (OOP)

Practicing Abstraction, Encapsulation, Inheritance,
Method Overriding, Method overriding and Polymorphism.

Practicing Sorting of Objects

Practicing Abstraction (Abstract Data Types, the ArrayList class, Lists..)

Practicing File/IO in Java

Practicing Serialization and Binary Files in Java