int GetLeftToRightDiagSum(vector<vector<int>>& arr)
{
    int sum = 0;
    for(int i = 0; i < arr.size(); i++)
    {
        sum+= arr[i][i];
    }
    return sum;
}

int GetRightToLeftDiagSum(vector<vector<int>>& arr)
{
    int sum = 0;
    int int_arr_size = arr[0].size() - 1;
    for(int i = 0; i < arr.size(); i++)
    {
        sum+= arr[i][int_arr_size - i];
    }
    return sum;
}

int diagonalDifference(vector<vector<int>> arr) {
    int a = GetLeftToRightDiagSum(arr);
    int b = GetRightToLeftDiagSum(arr);
    
    return (a > b) ? (a-b) : (b-a);
}