Delta X Interview Questions and Answers Last Updated : 08 Jan, 2024 Improve Improve Like Article Like Save Share Report Aspiring software engineers seeking to crack the code of success at DeltaX, buckle up! This article dissects the interviews at DeltaX, offering an exclusive guide to the frequently asked questions across key technical areas: Data Structures and algorithms (DSA), Database Management Systems (DBMS), Object-Oriented Programming (OOP), Computer Networking (CN)and Operating Systems (OS). Whether you’re navigating complex tree traversals, crafting efficient SQL queries, mastering inheritance principles, or understanding memory management, this insider insight will equip you with the knowledge and confidence to conquer your DeltaX interview. Dive in, sharpen your skills, and get ready to ace your path to becoming a DeltaXian! Table of Content DSA Problems OS DBMS Computer Networks OOPS DSA Problems Problems Practice Print K largest(or smallest) elements in an array Solve Check if two arrays are equal or not Solve Find the Missing Number Solve Inversion count in Array using Merge Sort Solve Merge two sorted arrays Solve Equilibrium index of an array Solve Median of two Sorted Arrays of Different Sizes Solve Searching in Binary Search Tree (BST) Solve Binary Heap Operations Solve Convert a given tree to its Sum Tree Solve Segment Tree | Sum of given range Solve Find the element that appears once Solve Binary Search – Data Structure and Algorithm Tutorials Solve Detect cycle in an undirected graph Solve Topological Sort Solve Strongly Connected Components in a Graph Solve How to find Shortest Paths from Source to all Vertices using Dijkstra’s Algorithm Solve Minimum number of nodes to be selected to light up all the edges of the tree (Select Nodes) Solve Floyd-Warshall Algorithm Solve Minimum Spanning Tree Solve Total number of Spanning Trees in a Graph Solve Minimum Initial Points to Reach Destination Solve Longest Common Subsequence Solve Edit Distance Solve Minimum Sum Path in a Triangle Solve Count number of coins required to make a given value (Coin Change II) Solve The Painter’s Partition Problem Solve Rod Cutting Problem Solve Matrix Chain Multiplication | DP-8 Solve Huffman Coding | Greedy Algo-3 Solve Find Subarray with given sum | Set 1 (Non-negative Numbers) Solve Smallest subarray with sum greater than x Solve N-Queens Problem Solve Find i’th Index character in a binary string obtained after n iterations Solve Rabin-Karp Algorithm for Pattern Searching Solve Trie | (Insert and Search) Solve Count of strings whose prefix match with the given string to a given length k Solve Partition problem | DP-18 Solve Matrix Chain Multiplication Solve Tarjan’s Algorithm to find Strongly Connected Components Solve Insertion in an AVL Tree Solve K’th largest element in a stream Solve Longest Increasing Subsequence (LIS) Solve Program for array left rotation by d positions. Solve Stock Buy Sell to Maximize Profit Solve 0/1 Knapsack Problem Solve Trapping Rain Water Solve Word Break Problem | DP-32 Solve Wildcard Pattern Matching Solve Implementing Regular Expression Matching Solve Operating System An Operating System(OS) is software that manages and handles the hardware and software resources of a computer system. It provides interaction between users of computers and computer hardware. Difference between contiguous and non-contiguous memory allocation. Compare and contrast synchronous and asynchronous I/O operations. Describe the benefits and drawbacks of thread pools in multithreaded programming. Different types of disk scheduling algorithms and their performance characteristics. How does paging work in virtual memory systems? What are the page table and TLB? Concept of system calls and their role in the interaction between user programs and the kernel. Discuss the various types of file system locks and their purpose in preventing data corruption. How does user authentication and authorization work in an operating system? Explain the advantages and limitations of different types of distributed file systems. DBMS Database Management System is a software or technology used to manage data from a database. Some popular databases are MySQL, Oracle, MongoDB, etc. Explain the ACID properties of transactions and provide real-world examples. Differentiate between primary key, candidate key, and unique key. Write an efficient SQL query to find the top N highest salaries in a Employees table. Explain the concept of joins (inner, outer, left, right) and when to use each type. Discuss different types of database normalization (1NF, 2NF, 3NF) and their benefits. How would you handle concurrency issues in a database like deadlocks and lost updates? Explain the difference between B-Tree and Hash indexing and their performance implications. Advantages and disadvantages of NoSQL databases compared to traditional relational databases. Explain the concept of database transactions and isolation levels Computer Networks A computer network is a collection of computers or devices connected to share resources. Any device which can share or receive the data is called a Node. Explain the difference between Unicasting, Anycasting, Multicasting, and Broadcasting. Describe the OSI Model and the different layers involved. What is the role of TCP and UDP protocols in data transmission? How does routing work in a network? Explain different routing protocols. Discuss the concept of subnetting and its benefits. Explain the working of DHCP and its importance in assigning IP addresses. What are firewalls and how do they protect networks from security threats? Describe different types of network attacks and methods to mitigate them. Explain the concept of virtual networks and their applications. Compare and contrast wired and wireless network technologies. OOPS Object-oriented programming – As the name suggests uses objects in programming. Object-oriented programming aims to implement real-world entities like inheritance, hiding, polymorphism, etc. in programming. Explain the four pillars of object-oriented programming (OOP) Differentiate between classes and objects. Different types of inheritance (Single, Multilevel, Hierarchical, Hybrid) Different forms (Method Overloading and Overriding). Benefits and drawbacks of using abstract classes and interfaces. Explain the concept of access modifiers (public, private, protected) and their usage. Describe the difference between constructor and destructor Explain the concept of exception handling and its importance in error management. Discuss the difference between shallow copy and deep copy in object cloning. Concept of operator overloading and its applications in customizing operation behaviour. 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