Welcome to today's session on "Multidimensional Arrays and Their Traversal in C++". Multidimensional arrays are types of arrays that store arrays at each index instead of single elements. Picture it as an 'apartment building' with floors (the outer array) and apartments on each floor (the inner array). Our goal today is to strengthen your foundational knowledge of these 'apartment buildings' and how to handle them effectively in C++.

To construct a multidimensional array in C++, we use vectors inside vectors. Here's an example of a 2-dimensional array:

In this example, array is a 2-dimensional vector, just like a 3-story 'apartment building,' where every floor is an inner vector.

All indices in C++ arrays are 0-based. Let's say you want to visit an apartment on the second floor (index 1) and bring a package to the first unit (index 0) in this building. Here's how you can do it: