\documentclass[twocolumn]{article}

\usepackage{amssymb}
\usepackage{amsmath}

%%REFERENCE: contains a single-sided copy of your Team REFERENCE
%%Document.  The document can contain up to 25 pages of reference
%%material, single-sided, letter or A4 size, with pages numbered in the
%%upper right-hand corner.  Text and illustrations must be readable by a
%%person with correctable eyesight without magnification from a distance
%%of 1/2 meter.  It may include hand-written comments and corrections on
%%the fronts of pages only ***.

\usepackage{fullpage}
\usepackage{sectsty}
%\allsectionsfont{\centering}
\sectionfont{\large\centering}
\subsectionfont{\normalsize\centering}

%\pagestyle{headings}
\usepackage[usenames,dvipsnames]{color}
\definecolor{Comment}{rgb}{0.5,0.5,0.5}
\definecolor{Keyword}{rgb}{0.2,0.2,0.6}
\definecolor{Identif}{rgb}{0.2,0.1,0.1}
\definecolor{Morekey}{rgb}{0.3,0.5,0.3}

\usepackage{listings}

\lstset{language=C++}
\lstset{basicstyle=\small\ttfamily}
\lstset{
        keywordstyle=\bfseries\color{Keyword},
        commentstyle=\color{Comment},
	identifierstyle=\color{Identif},
	emph={ALL,FOR,FOREACH,string,vector,map,pair},
        emphstyle=\color{Morekey},
%        stringstyle=\ttfamily,
        showstringspaces=false
}
\usepackage{graphicx}
%\usepackage{fancyheadings}
\usepackage{fancyhdr}
\pagestyle{fancy}
%\lhead{}
\rhead{\thepage}
\cfoot{}

\addtolength{\topmargin}{-0.80in}  
%\addtolength{\headheight}{0.80in}
\addtolength{\headsep}{0.25in}
\addtolength{\textheight}{0.85in}
\begin{document}

\onecolumn
\tableofcontents
\twocolumn

%\input{toc}
%\newpage
\input{prob-solv}
\input{common-stl}
\input{summations}
\input{tri-areas}
\input{poly-area}
\newpage
\input{combin}
\input{bin-coeff}
\input{catalan}
\newpage
\input{config}
\newpage
\input{vectors}
\input{alg}
\input{printf}
\newpage
\input{java}
\newpage
\input{monte-carlo}
\newpage
\input{geom}

\end{document}



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