If you need the knowledge but can't afford the specific book, GeeksforGeeks
Email your professor or the department’s teaching assistant. Explain that the textbook is cost-prohibitive. Many instructors have permission to share one digital chapter at a time via the course LMS (Canvas, Blackboard). They might also provide a PDF of the specific pages needed for the week’s assignment. C-- Plus Data Structures 6th Edition Pdf Github
Fork a repository that contains the textbook’s Utility.h file. That way, you have the exact helper functions the book uses, even without the PDF. If you need the knowledge but can't afford