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

You're pretty much going to have to go with the loop version. You can make one slight improvement, which is to allocate one big block and then build your own int* index into it:

int **array;
int *storage;
cin >> rows >> col;
array = new *int[rows];
storage = new int[rows*col];
for (int i = 0; i < rows; ++i)
    array[i] = storage + col * i;

This has the nice property that you can still use array[i][j] syntax for accessing the array.