C++ 2D array 01

#include <cstdlib>

using namespace std;
int main()
{
	int n, m;

	cout << "rows: " << endl;
	cin >> n;
	cout << "columns: " << endl;
	cin >> m;

	int** arr = new int*[n]; // ARRAY
	for (int i = 0; i < n; ++i)
		arr[i] = new int[m];

	for (int i = 0; i < n; i++) // ARRAY INPUT
	{
		for (int j = 0; j < m; j++)
		{
			arr[i][j] = rand() % 135 + (-12);
		}
	}

	for (int i = 0; i < n; i++) // ARRAY OUTPUT
	{
		for (int j = 0; j < n; j++)
		{
			cout << arr[i][j] << endl;
		}
	}

	delete[] arr; // FREEING MEMORY

}