DiamondMatrix

        public static void CreateDiamond(int[,] arr)
        {
            int oneVal = 0, change = 1;
            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int k = 0; k < arr.GetLength(1); k++)
                {
                    if (k == arr.GetLength(1) / 2 - oneVal || k == arr.GetLength(1) / 2 + oneVal)
                        arr[i, k] = 1;
                    else
                        arr[i, k] = 0;
                }
                if (oneVal == arr.GetLength(0) / 2)
                    change = -1;
                oneVal += change;
            }
        }
        public static bool CheckDiamond(int[,] arr)
        {
            int oneVal = 0, change = 1;
            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int k = 0; k < arr.GetLength(1); k++)
                {
                    if (k == arr.GetLength(1) / 2 - oneVal || k == arr.GetLength(1) / 2 + oneVal)
                    {
                        if (arr[i, k] != 1)
                            return false;
                    }
                    else
                    {
                        if (arr[i, k] != 0)
                            return false;
                    }
                }
                if (oneVal == arr.GetLength(0) / 2)
                    change = -1;
                oneVal += change;
            }
            return true;
        }