\documentclass[10pt]{report}

\usepackage[utf8x]{inputenc}
\usepackage[frenchb]{babel}
\usepackage{ucs}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{eurosym}
\usepackage{enumerate}
\usepackage{hyperref}
\usepackage{listings}
\usepackage{color}
\usepackage{array}
\usepackage{tikz}

\usepackage{gantt}

\definecolor{dkgreen}{rgb}{0,0.6,0}
\definecolor{gray}{rgb}{0.5,0.5,0.5}
\definecolor{mauve}{rgb}{0.58,0,0.82}

\lstset{language=C++,keywordstyle=\color{blue},stringstyle=\color{mauve}}

\usetikzlibrary{arrows}

\begin{document}

\input{main}

\end{document}