Use the techniques from the Vector implementation in section 12.4 to implement the Grid class, with the exception of bracket selection, which is much trickier to code for a two-dimensional structure.

In exercise 9 from Chapter 12, you were asked to implement a class called My String that duplicated as closely as possible the behavior of the string class in the C++ libraries. For this exercise, re-implement My String so that it uses a linked list of characters instead of a dynamic array as its underlying representation.