C# matrike

class Matrix
{
  private int r, c;
  private int[][] data;
  public Matrix(int rows, int cols)
  {
    r = rows;
    c = cols;
    data = new int[r][c]; // ali ikako se ze inicializira 2d array
  }
  public void Set(int row, int col, int value)
  {
    // TODO: preveri ce sta row in col dovoljena
    data[row][col] = value;
  }
  public int Get(int row, int col)
  {
    // TODO: preveri ce sta row in col dovoljena
    return data[row][col];
  }
  public Matrix Submatrix(int r_offset, int c_offset, int rows, int cols)
  {
    // TODO: preveri ce so offseti, rows in cols dovoljeni
    Matrix m(rows, cols);
    for (int i=0; i<rows; ++i)
      for (int j=0; j<cols; ++j)
      {
        if ((r_offset + i < r) && (c_offset + j < c))
          m.Set(i,j,data[r_offset+i][c_offset+j];
      } 
     return m;
  }
  public Matrix[] Split9x9to3x3()
  {
    Matrix m[] = new Matrix[9];
    for (int i =0; i<9; ++i)
    {
      m[i] = Submatrix((i/3)*3, (i%3)*3, 3, 3);
    }
    return m;
  }
}