This is a book written in Croatian. Its original title is Napredno programiranje i algoritmi u C -u i C++ -u.
I liked this book. At times I found my mind wandering, but I loved its approach to teaching the material: it focused on doing exercises. There were really a lot of exercises and after some exercises multiple solutions were presented, depending on their time or memory efficiency. This is a book I will probably be revisiting in the future.
You can find the GitHub repository for this book’s exercises here.