The latex used packages listings provided

\ DocumentClass [UTF . 8 ] Article This article was} { 
\ usepackage {listings} 
\ {usepackage Color, xcolor} 
\ {fontspec usepackage} 
\ usepackage xeCJK} { 
\ setmonofont [the Mapping = {}] {%} Monaco quotes like normal display, the equivalent of the English font settings 
\ setsansfont Monaco} { % set English font Monaco, Consolas, Fantasque Sans Mono 
\ setmainfont Monaco} { % set English font 
\ setCJKmainfont {Microsoft elegant black}   % Chinese font settings
 % \ setCJKsansfont {italics}% Chinese font set
 % \ setCJKmonofont {}% provided Chinese character 

\ definecolor mygreen {} {} {RGB 0 , 0.6 , 0 } 
\ {mygray definecolor} {} {RGB 0.5 ,0.5 , 0.5 } 
\ definecolor {mymauve} {RGB} { 0.58 , 0 , 0.82 } 
\ lstset { 
backgroundColor = \ Color {White},% the Choose The background Color 
basicstyle = \ footnotesize \ Monaco,% size of Fonts Used for The code or changed \ small \ monaco slightly larger than 
a numbers = left,% set the line number 
numberstyle = \ Tiny \ monaco,% set the font size for the line number 
the Columns = fullflexible, 
breaklines = to true ,% Automatic line Breaking only AT whitespace 
captionposB =,% The sets caption- position to bottom 
TabSize = . 4 , from 4% to tab expansion spaces, the default is 8 too 
commentstyle = \ mygreen Color {},% set annotation color 
escapeinside = {\% *} { *)},% IF you want to the Add LaTeX WITHIN your code 
keywordstyle = \ color {Blue},% set keyword color 
stringstyle = \ color {mymauve} \ Monaco,% String literal style 
frame = SINGLE,% is provided with a border 
rulesepcolor = \ Color Red {! 20 is ! Green! 20 is ! Blue! 20 is },
% Identifierstyle = \ Color {Red}, 
Language = C ++ , 
} 

\ the begin {Document} 

\ the begin {lstlisting} 
inline int GCD ( int A, int B) { 
     // If a <b, recursively obtain gcd (b, a % b) i.e. gcd (b, a), i.e. the exchange position, the time complexity of O (log max (a, B)) 
    return B == 0 a:? GCD (B, a% B) 
} 
inline int LCM ( int A, int B) {
     return A / GCD (A, B) * B; 
} 
\} End {lstlisting 

\ Document End {}