c++ declare an array of arrays without know the size

Question

I must declare an array of arrays or multidimensional array without know the size. I want to do something similar that I do in this cases with simple arrays:

Answer 1

Why not use std::vector?

std::vector > array;

If you don't want to use an array of pointers, you could use one large array that you allocate dynamically after you get the size and access it as an array of rows.

int rows = 10;
int columns = 20;

int* array = new int[rows * columns];

for (int count = 0; count < rows; count++)
{
   int* row = &array[count * columns];

   for (int inner_count = 0; inner_count < columns; inner_count++)
   {
      int* element = &row[inner_count];

      //do something
   }
}

delete [] array;