{   printf("Input elements of array\n");   for (i = 0; i < n; i++)    for (j = 0; j < n; j++)    {     printf("Input a[%d][%d] = ", i, j);     scanf_s("%d", &a[i][j]);    }  }  b[n - 1][0] = a[n - 1][0];  for (j = 1; j < n; j++)