Ich habe ein kleines Problem mit der Formatierung meiner verschachtelten Liste. Es scheint eine Überschneidung mit (b) (i) und (c) (i) zu geben. Die Formatierung in den Antworten auf dieselbe Frage ist jedoch in Ordnung. Ich bin mir nicht sicher, warum das passiert. Hier ist ein MWE basierend aufdiese Antwort
\documentclass{book}
\usepackage{newfile}
\usepackage{amsmath}
\usepackage{xifthen}
\usepackage{enumitem}
\usepackage{multicol}
\setlength{\parindent}{0pt}
\newoutputstream{solutions}
\openoutputfile{\jobname.solutions}{solutions}
\newcounter{exblock}
\newlist{exercises}{enumerate}{3}
\setlist[exercises]{font=\bfseries}
% \setlist[exercises,1]{label=\arabic*.}% format in MWE
\setlist[exercises,1]{label=Q\arabic*}% requested format
\setlist[exercises,2]{label=(\alph*),noitemsep}
\setlist[exercises,3]{label=(\roman*),noitemsep}
\newlist{solutions}{enumerate}{3}
\setlist[solutions]{font=\bfseries}
% \setlist[solutions,1]{label=\arabic*.}% format in MWE
\setlist[solutions,1]{label=Q\arabic*}% requested format
\setlist[solutions,2]{label=(\alph*),noitemsep}
\setlist[solutions,3]{label=(\roman*),noitemsep}
\newcommand{\exheader}{%
\ifthenelse{\value{exblock}>0}{%
\addtostream{solutions}{%
\noexpand\end{solutions}%
}%
}{}%
\refstepcounter{exblock}%
\section{Exercises}%
\label{ex.\arabic{exblock}}%
\addtostream{solutions}{%
\noexpand\paragraph{Exercises \noexpand\ref{ex.\arabic{exblock}}, page \noexpand\pageref{ex.\arabic{exblock}}}%
}
\addtostream{solutions}{\noexpand\begin{solutions}}%
}
\newcommand{\printsolutions}{%
\ifthenelse{\value{exblock}>0}{%
\addtostream{solutions}{\noexpand\end{solutions}}%
}{}%
\closeoutputstream{solutions}%
\input{\jobname.solutions}%
}
\newcommand{\question}[2]{%
\item \label{ex.\arabic{exblock}.\arabic{exercisesi}} #1%
\addtostream{solutions}{\noexpand\item[\noexpand\ref{ex.\arabic{exblock}.\arabic{exercisesi}}] #2}%
}
\newenvironment{subquestions}[1][]{%
\item \label{ex.\arabic{exblock}.\arabic{exercisesi}} #1%
\addtostream{solutions}{%
\noexpand\item[\noexpand\ref{ex.\arabic{exblock}.\arabic{exercisesi}}]\noexpand\begin{solutions}%
}%
\begin{exercises}%
}{%
\end{exercises}%
\addtostream{solutions}{\noexpand\end{solutions}}%
}
\newcommand{\subquestion}[2]{%
\item\label{ex.\arabic{exblock}.\arabic{exercisesi}.\arabic{exercisesii}} #1
\addtostream{solutions}{\noexpand\item[\noexpand\ref{ex.\arabic{exblock}.\arabic{exercisesi}.\arabic{exercisesii}}] #2}%
}
\newenvironment{subparts}[1][]{%
\item \label{ex.\arabic{exblock}.\arabic{exercisesi}.\arabic{exercisesii}} #1%
\addtostream{solutions}{%
\noexpand\item[\noexpand\ref{ex.\arabic{exblock}.\arabic{exercisesi}.\arabic{exercisesii}}]\noexpand\begin{solutions}%
}%
\begin{exercises}%
}{%
\end{exercises}%
\addtostream{solutions}{\noexpand\end{solutions}}%
}
\newcommand{\subpart}[2]{%
\item\label{ex.\arabic{exblock}.\arabic{exercisesi}.\arabic{exercisesii}.\arabic{exercisesiii}} #1
\addtostream{solutions}{\noexpand\item[\noexpand\ref{ex.\arabic{exblock}.\arabic{exercisesi}.\arabic{exercisesii}.\arabic{exercisesiii}}] #2}%
}
\begin{document}
\chapter{First Chapter}
\exheader
\begin{exercises}
\question{This is a test question}{solution 1}
\begin{subquestions}
\subquestion{testing1a}{testing answer1}
\subquestion{testing1b}{testing answer2}
\subquestion{testing1c}{testing answer3}
\begin{subparts}
\subpart{First Sub Part}{First Subpart answer}
\subpart{Second Sub Part}{Second Subpart answer}
\subpart{Third Sub Part}{Third Subpart answer}
\end{subparts}
\subquestion{testing1e}{testing answer3}
\end{subquestions}
\begin{subquestions}
\begin{subparts}
\subpart{arg1}{arg2}
\subpart{arg1}{arg2}
\subpart{arg1}{arg2}
\subpart{arg1}{arg2}
\end{subparts}
\begin{subparts}
\subpart{arg1}{arg2}
\subpart{arg1}{arg2}
\subpart{arg1}{arg2}
\subpart{arg1}{arg2}
\end{subparts}
\begin{subparts}
\subpart{arg1}{arg2}
\subpart{arg1}{arg2}
\subpart{arg1}{arg2}
\subpart{arg1}{arg2}
\end{subparts}
\end{subquestions}
\end{exercises}
\chapter{Appendix}
\section{Solutions}
\printsolutions
\end{document}