The Moden C++ Challenge - good book to improve programming with general stuff

Book link in pactpub.com - https://www.packtpub.com/mapt/book/application_development/9781788993869

Blogpost about the book by a C++ expert:
- http://scottmeyers.blogspot.com/2018/06/interesting-book-modern-c-challenge.html

All in all, there are 100 problems in a variety of areas, including string processing, dates and time, concurrency, cryptography, and networking.