Simulation settings

    \begin{algorithm}
    \caption{ShellSort}
    \begin{algorithmic}
    \PROCEDURE{ShellSort}{$A, n$}
        \STATE $gap \gets \left \lfloor{n / 2}\right \rfloor$
        \WHILE{$gap > 0$}
            \FOR{$i \gets gap$ \TO $n - 1$}
                \STATE $j \gets i$
                \WHILE{$j \geq gap$ \AND $A[j] < A[j - gap]$}
                    \STATE \CALL{swap}{$A[j]$, $A[j - gap]$}
                    \STATE $j \gets j - gap$
                \ENDWHILE
            \ENDFOR
            \STATE $gap \gets \left \lfloor{gap / 2}\right \rfloor$
        \ENDWHILE
    \ENDPROCEDURE
    \end{algorithmic}
    \end{algorithm}