JAVA code public static int diagonalDifference(List> arr) { // Write your code here int primaryDiagonalSum = 0; int secondaryDiagonalSum = 0;

for (int i = 0; i < arr.size(); i++) {
    primaryDiagonalSum += arr.get(i).get(i);
    secondaryDiagonalSum += arr.get(i).get(arr.size() - i - 1);
}

int diff = Math.abs(primaryDiagonalSum - secondaryDiagonalSum);
return diff;
}