%\begin{table}[h]
\begin{tabular}{|c|cc|cc|}
\hline
           & \multicolumn{2}{c|}{input args: 100, 200000} &
\multicolumn{2}{c|}{input args : 10000, 20} \\ \hline
           & Java                 & C++                  & Java
& C++                 \\ \hline
useDoubles & 6.9                  & 33.7                 & 7.6
& 35.2                \\
useLongs   & 3.4                  & 1.5                  & 3.7
& 2.0                 \\ \hline
\end{tabular}
%\end{table}
