Added data structures and algorithms analysis by Clifford A. Shaffer (#9938)

* Update free-programming-books-subjects.md

* Update free-programming-books-subjects.md

books/free-programming-books-subjects.md

@@ -104,6 +104,7 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Data Structures](https://adityacse.weebly.com/uploads/2/4/0/7/24078687/data-structures.pdf) - Aditya CSE (PDF)
 * [Data Structures](https://en.wikibooks.org/wiki/Data_Structures) - Wikibooks
 * [Data Structures (Into Java)](https://inst.eecs.berkeley.edu/~cs61b/fa14/book2/data-structures.pdf) - Paul N. Hilfinger (PDF)
+* [Data Structures and Algorithm Analysis in C++](https://people.cs.vt.edu/~shaffer/Book/C++3elatest.pdf) - Clifford A. Shaffer (PDF)
 * [Data Structures and Algorithms: Annotated Reference with Examples](https://web.archive.org/web/20170715160229/http://dotnetslackers.com/Community/files/folders/data-structures-and-algorithms/entry30283.aspx) - G. Barnett, L. Del Tongo *(:card_file_box: archived)*
 * [Data Structures Succinctly Part 1, Syncfusion](https://www.syncfusion.com/resources/techportal/ebooks/datastructurespart1) - Robert Horvick
 * [Data Structures Succinctly Part 2, Syncfusion](https://www.syncfusion.com/resources/techportal/ebooks/datastructurespart2) - Robert Horvick