C++ int diagonalDifference(vector> arr) { int ltr = 0; int rtl = 0; int len = arr.size();

for (int i = 0; i<len; i++){
    ltr += arr[i][i];
    rtl += arr[i][len-1-i];
}

std::cout<<std::abs(ltr - rtl)<<std::endl;

return std::abs(ltr - rtl);

} `