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💯DSA INTERVIEW QUESTIONS AND ANSWERS 1. What is the difference between file structure and storage structure? The difference lies in the memory area accessed. Storage structure refers to the data structure in the memory of the computer system, whereas file structure represents the storage structure in the auxiliary memory. 2. Are linked lists considered linear or non-linear Data Structures? Linked lists are considered both linear and non-linear data structures depending upon the application they are used for. When used for access strategies, it is considered as a linear data-structure. When used for data storage, it is considered a non-linear data structure. 3. How do you reference all of the elements in a one-dimension array? All of the elements in a one-dimension array can be referenced using an indexed loop as the array subscript so that the counter runs from 0 to the array size minus one. 4. What are dynamic Data Structures? Name a few. They are collections of data in memory that expand and contract to grow or shrink in size as a program runs. This enables the programmer to control exactly how much memory is to be utilized.Examples are the dynamic array, linked list, stack, queue, and heap. 5. What is a Dequeue? It is a double-ended queue, or a data structure, where the elements can be inserted or deleted at both ends (FRONT and REAR). 6. What operations can be performed on queues? enqueue() adds an element to the end of the queue dequeue() removes an element from the front of the queue init() is used for initializing the queue isEmpty tests for whether or not the queue is empty The front is used to get the value of the first data item but does not remove it The rear is used to get the last item from a queue. 7. What is the merge sort? How does it work? Merge sort is a divide-and-conquer algorithm for sorting the data. It works by merging and sorting adjacent data to create bigger sorted lists, which are then merged recursively to form even bigger sorted lists until you have one single sorted list. 8.How does the Selection sort work? Selection sort works by repeatedly picking the smallest number in ascending order from the list and placing it at the beginning. This process is repeated moving toward the end of the list or sorted subarray. Scan all items and find the smallest. Switch over the position as the first item. Repeat the selection sort on the remaining N-1 items. We always iterate forward (i from 0 to N-1) and swap with the smallest element (always i). Time complexity: best case O(n2); worst O(n2) Space complexity: worst O(1) 9. What are the applications of graph Data Structure? Transport grids where stations are represented as vertices and routes as the edges of the graph Utility graphs of power or water, where vertices are connection points and edge the wires or pipes connecting them Social network graphs to determine the flow of information and hotspots (edges and vertices) Neural networks where vertices represent neurons and edge the synapses between them 10. What is an AVL tree? An AVL (Adelson, Velskii, and Landi) tree is a height balancing binary search tree in which the difference of heights of the left and right subtrees of any node is less than or equal to one. This controls the height of the binary search tree by not letting it get skewed. This is used when working with a large data set, with continual pruning through insertion and deletion of data. 11. Differentiate NULL and VOID ? Null is a value, whereas Void is a data type identifier Null indicates an empty value for a variable, whereas void indicates pointers that have no initial size Null means it never existed; Void means it existed but is not in effect 12. Do dynamic memory allocations help in managing data? How? Dynamic memory allocation stores simple structured data types at runtime. It has the ability to combine separately allocated structured blocks to form composite structures that expand and contract as needed, thus helping manage data of data blocks of arbitrary size, in arbitrary order.

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Lab Exercises 1. Set up your personal web server on your computer or get access to a web host to host your HTML files. 2. Choose a text editor to edit your code, for example, Notepad or VS code 3. What is hypertext? 4. What is a URL? 5. What is HTML? 6. What is CSS? 7. What is a web server? 8. What is the purpose of an index.html file? 9. What is an IP address? 10. What is the purpose of a DNS server?

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Some terms you should be familiar about 🔹 HTML (Hypertext Markup Language): The standard language used for creating the structure and content of web pages. 🔹 CSS (Cascading Style Sheets): A language used to describe the presentation and visual styling of HTML elements on a web page. 🔹 JavaScript: A programming language that adds interactivity and dynamic behavior to websites. 🔹 Responsive Web Design: Designing and building websites that adapt and look good on different devices and screen sizes, such as desktops, tablets, and mobile phones. 🔹 Front-end Development: The practice of creating the user-facing side of a website or application using HTML, CSS, and JavaScript. 🔹 Back-end Development: The development of the server-side logic and functionality that powers websites and applications. 🔹 API (Application Programming Interface): A set of rules and protocols that allow different software applications to communicate and share data with each other. 🔹 CMS (Content Management System): A software application that enables users to create, manage, and publish digital content on the web without requiring advanced technical knowledge. 🔹 Framework: A pre-built set of tools, libraries, and conventions that provide a foundation for building web applications, making development faster and more efficient. 🔹 UX (User Experience): The overall experience and satisfaction a user has while interacting with a website or application. 🔹 UI (User Interface): The visual design and layout of a website or application that users interact with. 🔹 SEO (Search Engine Optimization): The process of improving a website's visibility and ranking in search engine results to attract more organic (non-paid) traffic. 🔹 Domain Name: The unique address that identifies a website on the internet, such as (www. example. com) 🔹 Hosting: The service of storing and making web pages or applications accessible on the internet. 🔹 SSL (Secure Sockets Layer): A security protocol that encrypts the data transmitted between a web server and a user's browser, ensuring secure communication. 🔹 Debugging: The process of identifying and fixing errors or issues in software code. 🔹 Version Control: The management of changes to software code, allowing developers to track revisions, collaborate, and revert to previous versions if needed. 🔹 Deployment: The process of making a website or application available for public use, typically by uploading it to a web server or hosting platform. 🔹 UX/UI Design: The process of creating visually appealing and user-friendly interfaces that provide a positive user experience. 🔹 Wireframe: A basic visual representation or blueprint that outlines the structure and layout of a web page or application before any detailed design elements are added.

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