void create_adjacency_matrix(fstream &file, int size) //macierz sasiedztwa
{
	double **adj_matrix = new double *[size];

	for (int i=0; i<size ; i++)
		adj_matrix[i]=new double [size];

	for (int i = 0; i < size; i++)
	{
		for (int j=0; j<size; j++)
		{
			adj_matrix[i][j]=0;
		}
	}
	for ( int i=0; i < size; ++i )
		delete [] adj_matrix[i];
	delete [] adj_matrix;
}