Three dimensional arrays of integers in C++

Question

I would like to find out safe ways of implementing three dimensional arrays of integers in C++, using pointer arithmetic / dynamic memory allocation, or, alternatively using

Answer 1

With vectors:

std::vector< std::vector< std::vector< int > > > array3d;

Every element is accessible wit array3d[x][y][z] if the element was already added. (e.g. via push_back)