\usepackage{xcolor}+
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\usepackage{fontspec}+
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\usepackage[sc]{mathpazo}+
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\setmainfont[Ligatures=TeX]{Palatino Linotype}+
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\usepackage{amssymb}+
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\usepackage{amsmath}+
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\usepackage{menukeys}+
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\definecolor{darkblue}{rgb}{0,0,0.6}+
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\usepackage[colorlinks=true,urlcolor=darkblue,linkcolor=darkblue]{hyperref}+
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+
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\newcommand{\dn}{\stackrel{\mbox{\scriptsize def}}{=}}%+
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\definecolor{codegray}{gray}{0.9}+
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+
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\newcommand\grid[1]{%+
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\begin{tikzpicture}[baseline=(char.base)]+
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  \path[use as bounding box]+
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    (0,0) rectangle (1em,1em);+
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  \draw[red!50, fill=red!20]+
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    (0,0) rectangle (1em,1em);+
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  \node[inner sep=1pt,anchor=base west]+
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    (char) at (0em,\gridraiseamount) {#1};+
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\end{tikzpicture}}+
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\newcommand\gridraiseamount{0.12em}+
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+
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\makeatletter+
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\newcommand\Grid[1]{%+
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  \@tfor\z:=#1\do{\grid{\z}}}+
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\makeatother	+
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+
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\makeatletter+
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\def\fnote{\gdef\@thefnmark{}\@footnotetext}+
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\makeatother+
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+
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+
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\newcommand{\HEADER}{{\bf Please submit your solutions to the email address +
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7ccsmsen at gmail dot com. Please submit only ASCII text or PDFs. Every solution +
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should be preceeded by the corresponding question. Solutions will only be accepted until +
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30th December!}\bigskip}+
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+
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