public class LargestChessboard {

  static void findLargest (int[][] A)
  {
    int topLeftRow=-1, topLeftCol=-1;
    int bottomRightRow=-1, bottomRightCol=-1;
    
    // INSERT YOUR CODE HERE.


    printResult (" >> Your result: ", topLeftRow, topLeftCol, bottomRightRow, bottomRightCol);
  }


  //-------------------------------------------------------------------
  // Test code ...

  static void printResult (String msg, int topLeftRow, int topLeftCol, 
                           int bottomRightRow, int bottomRightCol)
  {
    System.out.println (msg + " (" + topLeftRow + "," + topLeftCol
                        + " ) (" + bottomRightRow + "," + bottomRightCol + ")");
  }
  

  public static void main (String[] argv)
  {
    // Test 1.
    int[][] A1 = {
      {0,1},
      {1,0}
    };
    printResult ("Test 1: Largest at ", 0, 0, 1, 1);
    findLargest (A1);


    // Test 2.
    int[][] A2 = {
      {1, 1, 1},
      {1, 1, 0},
      {1, 0, 1}
    };
    printResult ("Test 2: Largest at ", 1, 1, 2, 2);
    findLargest (A2);


    // Test 3.
    int[][] A3 = {
      {1, 0, 1, 1},
      {1, 0, 1, 0},
      {0, 1, 0, 1},
      {1, 0, 1, 1}
    };
    printResult ("Test 3: Largest at ", 1, 0, 3, 2);
    findLargest (A3);
    
  }

}