Multi-dimensional vector initialization

Question

I have following std::vector declaration:

std::vector > > m_input;

I am initializing

Answer 1

If you can assert that your vector dimensions are going to be of a fixed length, then why not use std::array?

For example:

std:array, 100>, 100>

That way you can take advantage of all the memory being contiguously allocated (as hinted at by Viktor_Sehr in the comments), without the added implementation woes of accessing a 1-dimensional array in a 3-dimensional way.