latex插入lingo代码

你可以使用`listings`宏包来插入Lingo代码。首先需要在导言区添加以下代码：

\usepackage{listings}
\lstdefinelanguage{Lingo}
  {morekeywords={Set, Minimize, Maximize, Subject to, By, S.t., Sum},
   sensitive=false,
   morecomment=[l]{//},
   morecomment=[s]{/*}{*/},
   morestring=[b]",
  }
\lstset{
  language=Lingo,
  basicstyle=\small\ttfamily,
  keywordstyle=\bfseries,
  commentstyle=\itshape,
  stringstyle=\ttfamily,
  showstringspaces=false,
  breaklines=true,
  frame=tb
}

然后，在正文中插入代码的方法如下：

\begin{lstlisting}
Set I := 1..5;
Set J := 1..4;
Param c{i in I, j in J} := i*j;
Var x{i in I, j in J} >= 0;
Var y{j in J} binary;
Minimize cost: sum{i in I, j in J} c[i,j]*x[i,j];
Subject to capacity {i in I}:
   sum{j in J} x[i,j] <= 1;
Subject to assignment {i in I, j in J}:
   x[i,j] <= y[j];
By row {i in I}:
   sum{j in J} x[i,j] = 1;
S.t. the {j in J}:
   sum{i in I} y[j] = 1;
\end{lstlisting}

其中，`lstlisting`环境中的代码即为Lingo代码。你可以根据需要调整`\lstset`中的参数，比如`basicstyle`控制代码字体，`frame`控制代码框架等。