jursz

int n = 2;
                        int[][] tab3 = new int[n][];
                        int[] tab = new int[20];
                        for (int i = 0; i < tab.Length; i++)
                        {
                            tab[i] = i;
                        }

                        for (int i = 0; i < n; i++)
                        {
                            tab3[i] = new int[tab.Length];
                        }

                        for (int i = 0; i < tab3.Length; i++)
                        {
                            for (int j = 0; j < tab3[i].Length; j++)
                            {
                                tab3[i][j] = tab[j];
                                Console.Write(tab3[i][j] + " ");
                            }
                            Console.WriteLine("\n");
                        }
                        Console.WriteLine("\n");