Diagonal Difference

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    int f_diag{},s_diag{};
    int col=arr[1].size()-1;
    for(int row=0;row<arr[0].size();row++)
    {
        f_diag+=arr[row][row];
        s_diag+=arr[col][row];
        col--;
    }
    return abs(f_diag-s_diag);