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