`Tree of Index`

.
└── 𝑰𝒎𝒑𝒐𝒓𝒕𝒂𝒏𝒕 𝑩𝒐𝒐𝒌𝒔
|   ├── Low Level Design
|   |   ├── Object Oriented Design
|   |   └── ...
|   |
|   ├── Aptitude & Reasoning
|   |   ├── Quantitative Aptitude by Dr. R S Aggarwal
|   |   └── ...
|   |
|   ├── Programming Language
|   |   ├── C
|   |   |   ├── Let Us C by Yashwant P. Kanetkar
|   |   |   ├── C in Depth by S. K. Srivastava
|   |   |   └── ...
|   |   ├── C++
|   |   |   ├── Let Us C++ by Yashwant P. Kanetkar
|   |   |   ├── C++: The Complete Reference by Herbert Schildt
|   |   |   └── ...
|   |   ├── Python
|   |   |   ├── Core Python by R. Nageswara Rao
|   |   |   └── ...
|   |   ├── Java
|   |   |   ├── Core Java - Black Book by R. Nageswara Rao
|   |   |   └── ...
|   |   └── ...
|   |
|   ├── Data Structures
|   |   ├── Data Structures and Algorithms by Narasimha Karumanchi
|   |   ├── Data Structures and Algorithms in Python by Michael T. Goodrich 
|   |   └── ...
|   |
|   ├── Algorithms
|   |   ├── Introduction to Algorithms by Thomas H. Cormen
|   |   ├── Algorithms by Robert Sedgewick and Kevin Wayne 
|   |   └── ...
|   |
|   ├── Competitive Programming
|   |   ├── Guide to Competitive Programming By Antti Laaksonen
|   |   ├── Competitive Programmer’s Handbook By Antti Laaksonen 
|   |   └── ...
|   |
|   ├── Coding Interviews
|   |   ├── Cracking the Coding Interview by GAYLE LAAKMANN McDowELL
|   |   ├── Conceptual Programming Tips for interviews and Competitive exams: Tricky problems and Solutions
|   |   └── ...
|   |
|   ├── Technical Subjects
|   |   ├── OOP
|   |   |   ├── Object Oriented Programming with C++ by E. Balagurusamy
|   |   |   └── ...
|   |   ├── OS
|   |   |   ├── Operating System Concepts by Abraham Silberschatz
|   |   |   └── ...
|   |   ├── DBMS
|   |   |   ├── Database System Concepts by Abraham Silberschatz
|   |   |   └── ...
|   |   ├── CN
|   |   |   ├── Computer Networking - A Top-Down Approach by James F. Kurose
|   |   |   └── ...
|   |   └── ...
|   └── ...
└── ...