There were two phone screen interviews.

The first one was good. The interviewer asked questions about the size of the structure, the complexity of some given functions, and one coding exercise about finding the missing number in an array.

Two weeks later, there was a second interview, which took 2 hours with 2 interviewers, 1 hour for each. The experience was bad.

There were only trivial and tricky but difficult questions, such as using C to implement C++ OOP features and allocating a 2D array with just one malloc, which will not be used in real work and study at all. The interviewers were not willing to communicate while I was coding.

Overall, the process was too stressful, and I did not get an offer.

Allocate memory for a 2D array with only one malloc.

Use C++ to implement C++ class inheritance and virtual functions.