object oriented C++ practice problems

Hello world!

I try to find over the Internet a website that has practice problems on C++ classes and object (+inheritance,+polymorphism), but I can not find anything.
Can anyone suggest any website that contains such problems?

Thank you in advance!
Thank you coder777 (6062),
very interesting link, but I am looking for assignments, and If possible with the answers (or doing tests of correctness and performance).
For example like
https://codility.com/programmers/lessons/4-counting_elements/
but with classes...
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