maketitle               % Creates the titlepage
pagenumbering{gobble}   % Turns off page numbering
newpage                 % Starts a new page
tableofcontents         % Auto-generate a table of content after compile again.
newpage
pagenumbering{arabic}   % Turns on page numbering


section{Mathmatics}
    subsection{快速乘法，防止爆long long}