Add an entry for cleveref.

[chengniansun]

\usepackage{cleveref} % This package must be loaded in the end.

\Crefname{table}{Table}{Tables}
\crefname{table}{Table}{Tables}
\Crefname{figure}{Figure}{Figures}
\crefname{figure}{Figure}{Figures}
% \crefname{figure}{Fig.}{Figs.}
\Crefname{algocf}{Algorithm}{Algorithms}
\crefname{algocf}{Algorithm}{Algorithms}

% https://tex.stackexchange.com/questions/81634/cleveref-configure-symbol-for-all-sectioning-types-once-time
%
% I believe it's customary not to leave a space between the section symbol generated by \S (plural form \S\S) and the associated number (or numbers). To achieve this outcome using cleveref's cross-referencing commands, it's necessary to use the "low-level" controls \crefformat and \crefmultiformat; relying on the "high-level" control \crefname doesn't quite get you there, I think. The following MWE is a modified form of lockstep's example:
\crefformat{chapter}{\S#2#1#3}
\crefmultiformat{chapter}{\S\S#2#1#3}{ and~#2#1#3}{, #2#1#3}{, and~#2#1#3}

\crefformat{section}{\S#2#1#3}
\crefmultiformat{section}{\S\S#2#1#3}{ and~#2#1#3}{, #2#1#3}{, and~#2#1#3}