\documentclass[a4paper]{article}

\usepackage[utf8]{inputenc}
\usepackage{a4wide,color,Sweave,url,amsmath,booktabs,longtable,eurosym}
\newenvironment{question}{\item \textbf{Problem}\newline}{}
\newenvironment{solution}{\textbf{Solution}\newline}{}
\newenvironment{answerlist}{\renewcommand{\labelenumii}{(\alph{enumii})}\begin{enumerate}}{\end{enumerate}}

%% for pandoc/knitr-based syntax highlighting
\usepackage{framed}
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\DefineVerbatimEnvironment{Highlighting}{Verbatim}{commandchars=\\\{\}}
\newenvironment{Shaded}{\begin{snugshade}}{\end{snugshade}}
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\setkeys{Gin}{keepaspectratio}

\begin{document}
\begin{enumerate}
%% \exinput{exercises}
\end{enumerate}
\end{document}
