template.tex

\documentclass[a4paper,12pt]{article}
\usepackage[
  top=1.8cm,
  bottom=1.5cm,
  left=1.8cm,
  right=1.8cm,
  includefoot,
  includehead]{geometry}

\usepackage[utf8]{inputenc}
\usepackage{changepage}
\usepackage{multicol}
\usepackage{nccmath}
\usepackage{amsmath}
\usepackage{calc}
\usepackage{enumitem}
\usepackage[linewidth=1.2pt,linecolor=red]{mdframed}

% For fancy math
\RequirePackage{amsmath,amsthm,amssymb}
\newtheorem{theorem}{Theorem}
\newtheorem{fact}[theorem]{Fact}
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem{claim}[theorem]{Claim}

\newcommand{\ord}[2][th]{\ensuremath{{#2}^{\mathrm{#1}}}}
% shorthand for \mathcal{O}
\newcommand{\Ocal}{\ensuremath{\mathcal{O}}}
\newcommand{\aug}{\fboxsep=-\fboxrule\!\!\!\fbox{\strut}\!\!\!}
\newcommand{\contradiction}{%
  \ensuremath{{\Rightarrow\mspace{-2mu}\Leftarrow}}%
}

% Counters for HW number, author, and collaborators
\newcommand{\hwnumber}[1]{\def\hwnumberdata{#1}}
\def\hwnumberdata{\relax}
\renewcommand{\author}[1]{\def\authordata{#1}}
\def\authordata{\relax}
\newcommand{\collaborators}[1]{\def\collaboratorsdata{#1}}
\def\collaboratorsdata{\relax}

% Fancy headings
\RequirePackage{fancyhdr}
\pagestyle{fancyplain}

\fancyhead[L]{\small \authordata \\
\small CS 630 Homework \#\hwnumberdata \\
  \textsl{Collaborators}: \collaboratorsdata}

\RequirePackage{titlesec}
\titleformat{\subsection}{\normalsize\bfseries}{\thesubsection}{.5em}{}
\renewcommand{\thesubsection}{\alph{subsection})}

% Making the problem and ppart environments
\newcommand{\addmedskip}{\addvspace{2\medskipamount}}
\newcommand{\addbigskip}{\addvspace{2\bigskipamount}}
\newcommand{\nline}{\bigskip}

\newcounter{problemnum}
\setcounter{problemnum}{0}
\newenvironment{problem}
  {\addbigskip \setcounter{partnum}{0}
   \noindent\stepcounter{problemnum}\textbf{Problem \arabic{problemnum}.\ }}
  {\par\addbigskip}

\newcounter{partnum}
\setcounter{partnum}{0}

\newenvironment{ppart}[1][]{%
  \addmedskip
  \refstepcounter{partnum}%\par\medskip%
  \enumerate[labelsep=*]\item[\textbf{\roman{partnum})}]}
  {\endenumerate}

\newsavebox{\mybox}
\newenvironment{answer}
{\begin{lrbox}{\mybox}\begin{minipage}{0.95\textwidth}\vspace{0.2cm}}
  {\vspace{0.1cm}\end{minipage}\end{lrbox}\fbox{\usebox{\mybox}}}

\newenvironment{customProof}{\begin{proof}\noindent}{\end{proof}}

% Put your name and the homework number here.
\author{Jiun-Yan (Eric) Chen}
\hwnumber{1}


\begin{document}
\vspace*{0.5\baselineskip}
\textbf{Please limit your answer to the following problems to at most 1/2 a page each.}

\collaborators{None} % Put your collaborators the problem here
\begin{problem}

\begin{ppart}
\end{ppart}


\end{problem}

\newpage

\collaborators{None} % Put your collaborators the problem here
\begin{problem}

\begin{ppart}
\end{ppart}


\end{problem}
\end{document}