What are the sites\books\resources with tests (preferably with answers) on the C++ programming language and programming technologies?

Question

Books

What are the sites\books\resources with tests (preferably with answers) or questions on the C++ programming language and programming technologies for knowledge control?
Especially control questions in the form:
- find an error in the source code;
- what will be displayed as a result of the program;
- optimize the source code;
- write the code according to the given algorithm;
and the like for the C and C++ programming languages.
Well, in general, control questions on the theory of programming technologies, perhaps with practical examples (development life cycle, programming methodologies, testing, programming languages, and the like in accordance with the classic textbooks on "Programming Technologies")?
Maybe someone has already used or seen something similar, on the websites of universities or in training manuals or somewhere else?

Answer 1

Project Euler is cool, try solving in C++.

Answer 2

- find the error in the source code;
- what will be displayed as a result of the program;
- optimize the source code;
- write the code according to the given algorithm;
...
Maybe someone has already used or seen something like this, on the websites of universities or in training manuals or somewhere else?

I saw this in the compiler error log :D

Answer 3

I recommend sports programming sites:
There and online verification of the solution and optimization of the source code, and search for errors. In general, everything that a programmer constantly faces. If you do not know how to solve, then you can sort out the code of those who decided.