Coding Interview Resources

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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 You can check these resources for Coding interview Preparation Credits: https://t.me/free4unow_backup All the best 👍👍

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Java Constructor Interview Questions: 1. What are Constructors? - Constructor is a method which is used to initialize an instance of the class. 2. How does Constructor differ from a normal method? - Constructor has same name as class name. It doesn't have a return type. Constructor gets invoked only when instance of the object is getting created. 3. Can we invoke one Constructor from another Constructor? - Yes. Using this keyword. 4. Can we invoke superclass Constructor from Child class? - Yes. Using super keyword.

Basic OOP Concepts •What is the need for OOPs? •What are some major Object Oriented Programming languages? •What are some other programming paradigms other than OOPs? •What is meant by Structured Programming? •What are the main features of OOPs? •What are some advantages of using OOPs? •Why is OOPs so popular? •What is meant by the term OOPs? •What are the four main principles of OOP? •Explain the difference between a class and an object. •What is encapsulation? Provide an example. •What is abstraction? How is it different from encapsulation? •What is polymorphism? Explain with an example. •What is inheritance? How does it promote code reusability? •What are access specifiers in OOP? •What do you understand by OOP? Name any seven widely used OOP languages. •What is the purpose of using OOPs concepts? •What are the four main features of OOPs? •What are the advantages and disadvantages of OOP? •What are the limitations of OOPs? •What are the differences between object-oriented programming and structural programming? •What do you understand by pure object-oriented language? Why is Java not a pure object-oriented programming language? Like if you want me to post answer for each question 👍❤️

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