int mass(const int n, int** A, int** B)
{
	int** mass;
	mass = new_mass(n);
	if (!mass) { return 1; }
	for (int i = 0; i < n; i++)
		for (int j = 0; j < n; j++)
			mass[i][j] = A[i][j];
	return 0;
}
int mult_mass(const int n, int** A, int** B) 
{
	int** mass;
	mass = new_mass(n);
	if (!mass) { return 1; }
	for (int i = 0; i < n; i++)
		for (int j = 0; j < n; j++) 
		{
			mass[i][j] = 0;
			for (int k = 0; k < n; k++)
			{
				mass[i][j] += A[i][k] * B[k][j];
			}
	return 0;
}