我正在尝试创建一个环境，让我可以更改字体来表示一种算法，但出现了 Bad Box overfull \hbox 错误。
梅威瑟：
\documentclass{article}
\usepackage{enumerate, lipsum}
\newenvironment{aparts}{\begin{enumerate}[{(}a{)}]}{\end{enumerate}}
\newenvironment{algo}[3] % function name and parameters, input, output
{
\fontfamily{cmtt}\selectfont
\underline{#1}
Input: #2
Output: #3
\bigskip
}
{\bigskip}
\textheight=9in
\textwidth=6.5in
\topmargin=-.75in
\oddsidemargin=0.25in
\evensidemargin=0.25in
\begin{document}
\begin{aparts}
\item
{\fontfamily{cmtt}\selectfont
\underline{function eval(a[$a_0, a_1, ..., a_n$], x)}
Input: An array of constant coefficients a[$a_0, a_1, ..., a_n$] and a quantity to plug into the polynomial expression determined by the coefficients x
Output: The solution to the polynomial expression determined by the coefficients when x is plugged in as the variable
\bigskip
$p = a_0$
if $i >= 1$:
\quad for $i = n$ to 1:
\qquad $p = p + a_i$
\qquad $p = p * x$
return $p$
}
\bigskip
\item
{\fontfamily{cmtt}\selectfont
\underline{function eval(a[$a_0, a_1, ..., a_n$], x)}
Input: An array of constant coefficients a[$a_0, a_1, ..., a_n$] and a quantity to
\quad plug into the polynomial expression determined by the coefficients x
Output: The solution to the polynomial expression determined by the
\quad coefficients when x is plugged in as the variable
\bigskip
$p = a_0$
if $i >= 1$:
\quad for $i = n$ to 1:
\qquad $p = p + a_i$
\qquad $p = p * x$
return $p$
}
\bigskip
\item
\begin{algo}{function eval(a[$a_0, a_1, ..., a_n$], x)}
{An array of constant coefficients a[$a_0, a_1, ..., a_n$] and a quantity to plug into the polynomial expression determined by the coefficients x}
{The solution to the polynomial expression determined by the coefficients when x is plugged in as the variable}
$p = a_0$
if $i >= 1$:
\quad for $i = n$ to 1:
\qquad $p = p + a_i$
\qquad $p = p * x$
return $p$
\end{algo}
\item
\lipsum[50]
\end{aparts}
\end{document}
我收到以下错误：
段落第 35-36 行的 \hbox 过满（4.20915pt 太宽）[]\OT1/cmtt/m/n/10 输入：常数系数数组 a[$\OML/cmm/m/it/10 a[]; a[]; :::; a[]$\OT1/cmtt/m/n/10 ] 以及要插入到 [] 中的数量
段落第 37-38 行的 \hbox 超满（太宽了 10.0188pt） []\OT1/cmtt/m/n/10 输出：当 x [] 时，由系数确定的多项式表达式的解
段落第 88-88 行的 \hbox 过满（4.20915pt 太宽）[]\OT1/cmtt/m/n/10 输入：常数系数数组 a[$\OML/cmm/m/it/10 a[]; a[]; :::; a[]$\OT1/cmtt/m/n/10 ] 以及要插入 [] 的数量
段落第 88-88 行的 \hbox 超满（太宽 10.0188pt） []\OT1/cmtt/m/n/10 输出：当 x [] 时，由系数确定的多项式表达式的解
如您所见，第一个方法不起作用，但我通过强制换行解决了这个问题。当然，我不想每次都这样做，如果我把它放在环境的参数中，那就更烦人了。此外，我认为这与字体有关的原因是常规文本看起来很难找，如 (d) 所示。
我该如何解决这个问题？非常感谢。