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\begin{document}+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%+
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\frametitle{%+
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  \begin{tabular}{@ {}c@ {}}+
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  \\[5mm]+
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  \hspace{7mm}\huge PEP Scala (\liningnums{3}) +
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  \end{tabular}}+
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  \normalsize+
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  \begin{center}+
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  \begin{tabular}{ll}+
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    Email:  & christian.urban at kcl.ac.uk\\+
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    %Office: & N\liningnums{7.07} (North Wing, Bush House)\bigskip\\+
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    Slides \& Code: & KEATS\bigskip\\+
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+
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    Office Hour: &  Fridays 13:00 -- 14:00\\+
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    Location: & N7.07 (North Wing, Bush House)\bigskip\\+
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+
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    Pollev: & \texttt{\alert{https://pollev.com/cfltutoratki576}}\\  \\+
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    %Additionally: & (for Scala) Tuesdays 10:45 -- 11:45\\ +
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  \end{tabular}+
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  %\tiny+
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% Raw marks (261 submissions):\bigskip+
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% \item 3\%: \hspace{4mm}219+
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\begin{frame}[c,fragile]+
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\frametitle{Default Arguments}+
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\small+
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\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-3mm]+
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def collatzHelper(n: Int, a: Int = 0) : Int = ...+
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collatzHelper(n, 3)+
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collatzHelper(n, 0)+
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collatzHelper(n)   // a = 0   +
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\begin{frame}[c,fragile]+
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\frametitle{Last Week: Options \& HO Funs.}+
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\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]+
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List(7,2,3,4,5,6).find(_ < 4)+
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res: Option[Int] = Some(2)+
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List(5,6,7,8,9).find(_ < 4)+
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res: Option[Int] = None+
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List(1,2,3,4,5).map(x => x * x)+
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res: List[Int] = List(1, 4, 9, 16, 25)+
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\begin{frame}[c,fragile]+
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\frametitle{Web-Crawler (1)}+
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\small+
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\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-7mm]+
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def get_page(url: String) : String = {+
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Try(fromURL(url)("ISO-8859-1").take(10000).mkString)+
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   .getOrElse { println(s" Problem with: $url"); ""}+
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}+
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\begin{frame}[c,fragile]+
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\frametitle{Web-Crawler (2)}+
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+
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\small+
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\begin{lstlisting}[language=Scala, numbers=none, +
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                    xleftmargin=-7mm, escapeinside={(*@}{@*)}]+
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val http_pattern = """(*@\textcolor{codegreen}{"}@*)https?://[\^(*@\textcolor{codegreen}{"}@*)]*(*@\textcolor{codegreen}{"}@*)""".r+
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val email_pattern = +
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 """([a-z\d\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})""".r+
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def unquote(s: String) = s.drop(1).dropRight(1)+
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def get_all_URLs(page: String): Set[String] = +
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  http_pattern.findAllIn(page).map(unquote).toSet+
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  // returns all URLs in a page  +
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\end{lstlisting}+
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\begin{frame}[c,fragile]+
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\frametitle{Web-Crawler (3)}+
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\small+
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\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]+
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def crawl(url: String, n: Int) : Unit = {+
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  if (n == 0) ()+
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  else {+
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    println(s"  Visiting: $n $url")+
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    val page = get_page(url)+
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    for (u <- get_all_URLs(page)) +
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      crawl(u, n - 1)+
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  }+
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}+
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\end{lstlisting}+
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  +
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\begin{frame}[c,fragile]+
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\frametitle{Email Harvester}+
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\small+
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\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-3mm]+
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def emails(url: String, n: Int) : Set[String] = {+
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 if (n == 0) Set()+
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 else {+
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  println(s"  Visiting: $n $url")+
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  val page = get_page(url)+
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  val new_emails = +
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    email_pattern.findAllIn(page).toSet+
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  new_emails ++ +
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    (for (u <- get_all_URLs(page)) +
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       yield emails(u, n - 1)).flatten+
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 }+
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} +
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\frametitle{Jumping Towers}+
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  \draw[->,line width=0.5mm,cap=round,out=90,in=90,relative] (4.5,1) to (5.7,1);+
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  \node at (5.7, 0.8) {End};+
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\end{center}\bigskip+
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shortest: 3 $\rightarrow$ 4 $\rightarrow$ End+
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\begin{frame}[c]+
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\frametitle{next moves}+
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    [grow=right,level distance=30mm,child anchor=north,line width=0.5mm]+
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  \node {$[3,4,2,0,1]$}+
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\begin{frame}[c,fragile]+
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\frametitle{Reverse Polish Notation}+
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{\Large\bl{$(3 + 1) * (2 + 9)$}}\bigskip+
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{\Large$\Rightarrow$}\bigskip+
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{\;\;\Large\bl{$3\;\;1\;+\;2\;\;9\;+\;*$}}+
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\begin{textblock}{3}(11,4)+
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\begin{onlyenv}<2>+
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\begin{lstlisting}[language=JVMIS]+
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ldc 3+
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ldc 1+
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iadd+
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iadd+
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imul+
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% \item 1 core: 800 secs+
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% \item 8 cores: 290 secs+
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%   \large\bf{}Mind-Blowing Programming Languages:\\ +
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%\frametitle{Preliminary 1 (Scala)}+
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%+
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%Raw marks (298 submissions):\bigskip+
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%+
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%\begin{itemize}+
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%\item 3\%: \hspace{4mm}227+
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%\item 2\%: \hspace{4mm}35+
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%\item 1\%: \hspace{4mm}9+
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%\item 0\%: \hspace{4mm}27 +
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%\frametitle{Preliminary 2 (Scala)}+
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%+
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%Raw marks (301 submissions):\bigskip%+
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%+
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%\begin{itemize}+
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%\item 3.0\%: \hspace{4mm}236+
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%\item 2.5\%: \hspace{4mm}5+
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%\item 2.0\%: \hspace{4mm}7+
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%\item 1.5\%: \hspace{4mm}13+
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%\item 1.0\%: \hspace{4mm}1+
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\frametitle{\mbox{}\hspace{40mm}\textbf{Testing Server}}+
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{+
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  \frametitle{\mbox{}\hspace{40mm}\textbf{Feedback in+
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      \textcolor{red}{\underline{CFL}!}}}+
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  +
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\begin{minipage}{1.3\textwidth}+
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\begin{mybox3}{End-of-year feedback for 6CCS3CFL in 2019}\it\small+
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Unequivocally the worst module I've taken on this course. The subject+
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matter is fascinating, however the insistence on the use of this+
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abomination of a language "Scala" completely ruins it. If you're going+
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to teach something as complex as this, use a proper language, not some+
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"object oriented functional" abomination. Use C, you know, the+
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language that real compilers are written in. I will go to the end of+
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the earth to dissuade others from taking this module so long as Scala+
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is still being used.\\+
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\mbox{}\hfill-- Lone voice in the end-of-year feedback in 2019+
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\end{mybox3}+
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\frametitle{Students in CFL}+
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(2023,183)+
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(2022,112)+
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(2021,98)+
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(2020,59)+
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(2019,38)+
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(2018,20)+
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(2017,22)+
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(2016,8)};+
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\node[anchor=north, yshift=-10mm] at (mygraph.south) {\small{}Student numbers since the start of the compiler module.};+
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\begin{textblock}{5}(12, 2.5)+
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  \includegraphics[scale=0.15]{../pics/cfl.png}\\+
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  \hspace{5mm}2021+
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\mbox{}\\[-4mm]  +
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\begin{mybox3}{One comment from this year}\it\small+
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  I feel like the module's point is to help us experience what it is+
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  like to program very challenging problems, it's not very realistic+
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  as in a realistic scenario we would have access to the internet, and+
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  other people's code and may collaborate. I feel like the point of+
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  the module is taken away due to how the plagiarism and collusion+
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  rules are put into place.+
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\end{mybox3}+
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\end{minipage}\smallskip+
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+
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\begin{minipage}{1.3\textwidth}+
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\begin{mybox3}{Another comment from this year}\it\small+
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To prepare students for the C++ coursework better, for example introducing recursion and/or backtracking, because that is a big part of the coursework but wasn't even touched upon in the videos+
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\end{mybox3}+
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\end{minipage}\smallskip+
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+
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\begin{minipage}{1.3\textwidth}+
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\begin{mybox3}{Even another comment from this year}\it\small+
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The coursework is too difficult.+
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\end{mybox3}+
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\end{minipage}+
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}+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +
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{+
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\setbeamercolor{background canvas}{bg=cream}+
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\begin{frame}[c]+
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   +
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\begin{itemize}+
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\item we reduced the amount of work this year and gave more time for C++ CW+
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\item we recruited TA's for\bigskip+
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+
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installation problems:+
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\begin{itemize}+
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\item Oscar Sjostedt (\texttt{\small{}oscar.sjostedt@kcl.ac.uk})+
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\item Nicole Lehchevska (\texttt{\small{}nicole.lehchevska@kcl.ac.uk})\bigskip+
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\end{itemize}+
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github problems:+
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\begin{itemize}+
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\item Quan Tran (\texttt{\small{}anh.tran@kcl.ac.uk})\bigskip+
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\end{itemize}+
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discussion forum / general problems:+
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\begin{itemize}  +
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\item Ruben Ticehurst-James (\texttt{\small{}ruben.ticehurst-james@kcl.ac.uk})  +
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\end{itemize} +
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\end{itemize}    +
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+
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\only<2->{+
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\begin{textblock}{7}(9, 8)+
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  \textcolor{red}{\Large\bf Could you+
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    please spend the next 10 mins to fill+
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  out the end-of-year feedback.}+
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  \includegraphics[scale=0.035]{thanks.png}+
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\end{textblock}}+
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