Data Structures
Complete interactive certification program. Master all five units with real-time memory visualizers, execute 18 practical programs in-browser with GCC parity, solve 12 progressive LeetCode-style challenges, drill 230 technical viva questions, and earn your official verified SJ NexGen credential.
7-Step Roadmap to Complete DSA Mastery
Designed by Sagar Somayya Hiremath (Founder & Director, SJ NexGen Technologies) to take diploma, engineering, and CS students from foundational basics to industry-ready DSA problem solvers.
5 Unit Comprehensive Notes
Master Stacks, Queues, Linked Lists, Trees, and Graphs through memory layouts, pointer diagrams, and detailed time-complexity breakdowns.
Explore Syllabus →18 Practicals & Visualizers
Watch pointer swaps, dynamic memory allocation (malloc), and recursion trees in motion with our step-by-step visualizer and CVM code runner.
Open 18 Practicals →Progressive Coding Challenges
Solve 12 curated LeetCode-style challenges spanning Beginner, Intermediate, and Advanced tiers evaluated against hidden test cases in real-time.
Start Coding Challenges →230 Technical Viva Q&A Drills
Prepare thoroughly for technical examinations and industry placement interviews with model answers and code explanations.
Practice Viva Questions →₹200 Lifetime Access Activation
Simple scan-and-pay UPI process with 12-digit UTR verification. Unlocks unrestricted access to all notes, sandbox compilers, and tests.
Activate Pass (₹200) →20-Question Proctored Exam
Take a 30-minute anti-cheat proctored examination covering core DSA concepts. Achieve 60% or higher to qualify for your official credential.
Take Proctored Exam →SJ NexGen Verified Certificate
Receive your verifiable certificate signed by Sagar Somayya Hiremath (Founder, SJ NexGen Technologies), complete with a unique ID, dynamic QR code, and your exam score.
Verify Sample Certificate →Units
Follow the syllabus order. Every unit opens the complete notes.
Introduction to DS & Stack
Types of data structures: static, dynamic, primitive, non-primitive, linear and non-linear. Stack definition, representation, operations, implementation, Polish notation conversion and postfix evaluation.
Open notesQueues
Definition, representation, operations. Implementation of Linear Queue, Circular Queue and Priority Queue.
Open notesLists
Singly, Doubly and Circular Linked List. Stack and queue using linked list. Application: addition and subtraction of two polynomials.
Open notesTrees
Traversal, linked implementation, Binary Tree and BST operations (insert, delete, search), Multiway Trees, B-Trees, AVL single and double rotations.
Open notesGraphs
Undirected and directed graphs, graph terminology, computer representation of graphs, traversal methods: Depth First Search and Breadth First Search.
Open notesTechnical Viva Bank
Unit-wise viva questions with answers and C code, plus practical viva. Extra placement interview questions are marked (P).
Start revising18 Core DSA Practicals
All 18 practical programs. Open one to see it work, run it live in CVM, and master the algorithm.