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  1.  public static int diagonalDifference(List<List<Integer>> arr) {
  2.    
  3.     int size = arr.size();
  4.     int mainDiagonalSum = 0;
  5.     int theOtherDiagonalSum = 0;
  6.     for (int i = 0; i < arr.size(); i++) {
  7.         for (int j = 0; j < arr.get(i).size(); j++) {
  8.             int current = arr.get(i).get(j);
  9.             // check if number is on main diagonal
  10.             if (i == j) {
  11.                 mainDiagonalSum += current;
  12.             }
  13.             if (i + j == size - 1) {
  14.                 theOtherDiagonalSum += current;
  15.             }
  16.         }
  17.     }
  18.     return Math.abs(mainDiagonalSum - theOtherDiagonalSum);
  19.  
  20.     }
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