How to declare an infinite two-dimensional array of string type?

Question

C++ / C#

In general, you need to declare an infinite two-dimensional array and fill it sequentially (that is, how else to find out the number of the last row?)
How can this be done in the most "direct" way?
forms c++/cli project

Answer 1

you need to declare an infinite two-dimensional array and fill it

Cool. ;-)
It would be cooler only: to declare an infinite array of infinite dimension...

Answer 2

std::vector, std::list are fine for you.

Answer 3

If the array is sparse, i.e. many unfilled positions, then an imitation of an array based on a map is a good idea:
write at an arbitrary position:
read:
std::string s = arr[std::pair<int, int>(1, 3)];