Master Coding Interviews and Placements
Learn DSA systematically, practice targeted core subject interview questions, and access free placement roadmaps — all in one place.
Browse by Topics
pick your path and start practicing
How It Works
your roadmap from zero to offer
Browse Topics
Explore DSA patterns, CS fundamentals, and interview Q&A — all organized by topic for efficient study.
Practice Problems
Solve hand-picked problems with solutions and complexity analysis. Track your progress topic by topic.
Crack Interviews
Use placement roadmaps, resume guides, and behavioral prep to land your dream SDE role.
Latest Articles
fresh content to sharpen your edge
Bit Manipulation Tricks Every Developer Should Know (With Examples)
Master the most useful bit manipulation tricks used in coding interviews and competitive programming. Learn how bitwise operators work, perform fast binary operations, count set bits with Brian Kernighan’s algorithm, use bit masking, and solve common interview problems with clear explanations, practical examples, and a handy cheat sheet.
Fenwick Tree (Binary Indexed Tree): Complete Guide with Python, Diagrams & Interview Questions
Learn how the Fenwick Tree (Binary Indexed Tree) works with intuitive explanations, visual diagrams, and step-by-step examples. This complete guide covers the Least Significant Bit (LSB), point updates, prefix and range sum queries, Python implementation, complexity analysis, interview tips, and common mistakes to help you master one of the most important data structures for coding interviews and competitive programming.
LeetCode Patterns Every Student Should Know (2026 Guide)
Stop solving LeetCode problems randomly. Learn the seven core coding patterns that power most interview questions at top tech companies. This guide covers Two Pointers, Sliding Window, Binary Search, BFS, DFS, Backtracking, Merge Intervals, and more, with practical examples and study strategies to help you recognize patterns instead of memorizing solutions.
LRU Cache Explained: HashMap + Doubly Linked List (Python Guide)
Learn how the LRU (Least Recently Used) Cache achieves constant-time get and put operations by combining a HashMap with a Doubly Linked List. This guide includes Python implementations, visual explanations, interview pitfalls, production-ready alternatives using OrderedDict, and real-world applications in Redis, databases, browsers, and operating systems.
Featured Placement Roadmaps
structured paths to land your dream job
30-Day DSA Sheet
A hand-picked checklist of the top 100 coding interview problems covering arrays, strings, trees, and dynamic programming.
60-Day Placement Guide
Comprehensive timeline covering DSA foundation, OS/DBMS revision, mock resumes, and behavioral interview prep.
SQL Mastery Roadmap
Step-by-step path to master complex joins, subqueries, indexing, database design, and query optimization.