diff -r 2969ee4a6cee -r ca9c1cf929fa slides/slides04.tex
--- a/slides/slides04.tex	Fri Nov 22 17:01:55 2019 +0000
+++ b/slides/slides04.tex	Tue Nov 26 01:22:36 2019 +0000
@@ -1,3 +1,4 @@
+% !TEX program = xelatex
 \documentclass[dvipsnames,14pt,t,xelatex]{beamer}
 \usepackage{../slides}
 \usepackage{../graphics}
@@ -145,9 +146,11 @@
   \begin{center}
   \begin{tabular}{ll}
     Email:  & christian.urban at kcl.ac.uk\\
-    Office: & N\liningnums{7.07} (North Wing, Bush House)\\
-    Slides \& Code: & KEATS\medskip\\
-    Office Hours: &  Mondays 12:00 -- 14:00\\
+    Office: & N\liningnums{7.07} (North Wing, Bush House)\bigskip\\
+    Slides \& Code: & KEATS\\
+                    & \onslide<2>{\alert{A Crash-Course in Scala}}\bigskip\\
+    Office Hours: &  Thursdays 12:00 -- 14:00\\
+    Additionally: & (for Scala) Tuesdays 10:45 -- 11:45\\ 
   \end{tabular}
   \end{center}
 
@@ -155,88 +158,54 @@
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
 
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
-
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c]
-\frametitle{Somewhere Remote}
-
-\begin{center}
-\includegraphics[scale=0.37]{../pics/sahara.jpg}
-\end{center}
-
-\end{frame}
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\frametitle{Hints in CW}
 
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
-
-\begin{frame}[t]
-\frametitle{This is a bit harsh\ldots}
-
-\mbox{}\\[-22mm]\mbox{}
-
-\begin{center}
-\begin{bubble}[10.5cm]
-  ...trying a new method because the fucking github reports dont tell me
-  which test failed. It's not really helpful when the inline tests work
-  and it compiles but all i get is 'one test failed'... really helpful my dude.
-\end{bubble}
+\begin{center}  
+\includegraphics[scale=0.4]{../pics/hints.png}
 \end{center}
 
-\begin{center}
-\begin{bubble}[10.5cm]
-  ...Reverted back and finished part 5, this is ridiculous how one test works
-  and all I get is 'ONE TEST FAILED'. Fix your reports before giving us
-  assignments like this...
-\end{bubble}
-\end{center}
+\small
+\begin{itemize}
+  \item Scala Library, e.g.~\texttt{span} in \\
+  \url{https://www.scala-lang.org/api/current/scala/collection/immutable/List.html}
+\end{itemize}
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+  
 
 
-\end{frame}
-
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
-
-\begin{frame}[t,fragile]
-\frametitle{Needless to say I tried it out}
-
-\mbox{}\\[-7mm]\mbox{}\footnotesize
+\begin{frame}[c]
+\frametitle{Preliminary 7}
 
-\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-4mm]
-> legal_moves(8, Nil, (2,2))
- = List((3,4), (4,3), (4,1), (3,0), (1,0), (0,1), (0,3), (1,4))
-
-> legal_moves(8, Nil, (7,7))
- = List((6,5), (5,6))
+Raw marks (261 submissions):\bigskip
 
-> legal_moves(8, List((4,1), (1,0)), (2,2))
- = List((3,4), (4,3), (3,0), (0,1), (0,3), (1,4))
-
-> legal_moves(1, Nil, (0,0))
- = List((-1,-2), (-2,-1))
+\begin{itemize}
+\item 4\%: \hspace{4mm}236
+\item 3\%: \hspace{4mm}10
+\item 2\%: \hspace{4mm}1
+\item 1\%: \hspace{4mm}0
+\item 0\%: \hspace{4mm}15 
+\end{itemize}\bigskip\bigskip  
 
-> legal_moves(2, Nil, (0,0))
- = List((1,-2), (-1,-2), (-2,-1), (-2,1))
-
-> legal_moves(3, Nil, (0,0))
- = List((1,2), (2,1), (2,-1), (1,-2), (-1,-2), (-2,-1), (-2,1), (-1,2))
-\end{lstlisting}  
-
-\LEFTarrow{1}{9}{9}
-\LEFTarrow{1}{12}{11}
-\DOWNarrow{1}{10}{13}
+\footnotesize
+(interviews ongoing!)
 
 \end{frame}
 
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c,fragile]
 \small
   
-\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-7mm]
-def is_legal(dim: Int, p: Path, x: Pos): Boolean = {
-  if (......some_really_long_condition.....) false
+\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=1mm]
+def is_legal(dim: Int, p: Path, x: Pos) = {
+  if (...some_really_long_condition...) false
   else true
 }
 \end{lstlisting}
@@ -246,16 +215,130 @@
 \rule{11cm}{0.3mm}
 \bigskip
 
+\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=1mm]
+def is_legal(dim: Int, p: Path, x: Pos) = 
+  !(...some_really_long_condition...)
+\end{lstlisting}
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c,fragile]
+\small
+  
+\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=1mm]
+def foobar(...) = {
+  val cs = for (c <- str) yield c.toLowerCase
+  ...
+}
+\end{lstlisting}
+
+\pause
+\bigskip
+\rule{11cm}{0.3mm}
+\bigskip
+
+\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=1mm]
+def foobar(...) = {
+  val cs = str.map(_.toLowerCase)
+  ...
+}
+\end{lstlisting}
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c,fragile]
+\small
+  
 \begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-7mm]
-def is_legal(dim: Int, p: Path, x: Pos): Boolean = 
-  !......some_really_long_condition.....
-\end{lstlisting}\pause
-
+def RomanNumeral2Int(rs: RomanNumeral): Int = 
+ rs match { 
+   case Nil => 0
+   case M::r    => 1000 + RomanNumeral2Int(r)  
+   case C::M::r => 900 + RomanNumeral2Int(r)
+   case D::r    => 500 + RomanNumeral2Int(r)
+   case C::D::r => 400 + RomanNumeral2Int(r)
+   case C::r    => 100 + RomanNumeral2Int(r)
+   case X::C::r => 90 + RomanNumeral2Int(r)
+   case L::r    => 50 + RomanNumeral2Int(r)
+   case X::L::r => 40 + RomanNumeral2Int(r)
+   case X::r    => 10 + RomanNumeral2Int(r)
+   case I::X::r => 9 + RomanNumeral2Int(r)
+   case V::r    => 5 + RomanNumeral2Int(r)
+   case I::V::r => 4 + RomanNumeral2Int(r)
+   case I::r    => 1 + RomanNumeral2Int(r)
+ }
+\end{lstlisting}
 
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c,fragile]
+\frametitle{Last Week: Pattern Matching} 
+\small
+  
+\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=3mm]
+def fizz_buzz(n: Int) : String = 
+  (n % 3, n % 5) match {
+    case (0, 0) => "fizz buzz"
+    case (0, _) => "fizz"
+    case (_, 0) => "buzz"
+    case _ => n.toString  
+  }
+\end{lstlisting}
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
+\begin{frame}[c,fragile]
+\frametitle{Reverse Polish Notation}
+
+{\Large\bl{$(3 + 1) * (2 + 9)$}}\bigskip
+
+{\Large$\Rightarrow$}\bigskip
+
+{\;\;\Large\bl{$3\;\;1\;+\;2\;\;9\;+\;*$}}
+
+\begin{textblock}{3}(11,4)
+\begin{onlyenv}<2>
+\begin{lstlisting}[language=JVMIS]
+ldc 3
+ldc 1
+iadd
+ldc 2
+ldc 9
+iadd
+imul
+\end{lstlisting}
+\end{onlyenv} 
+\end{textblock}
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+ 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
+\begin{frame}[c,fragile]
+\frametitle{Sudoku}
+
+A very simple-minded version on 110 problems:\bigskip
+
+\begin{itemize}
+\item 1 core: 800 secs
+\item 2 cores: 400 secs
+\item 8 cores: 290 secs
+\item 18 cores: 142 secs
+\end{itemize}
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+ 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c]
 \frametitle{DFAs}  
 
@@ -349,12 +432,50 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
 
+
+\begin{frame}[t]
+
+  \begin{center}  
+  \includegraphics[scale=0.3]{../pics/blow.png}
+  \end{center}
+  
+  \begin{textblock}{14}(2,11.4)
+  \large\bf{}Mind-Blowing Regular Expressions:\\ 
+  \centering in Python, JavaScript, Java
+  \end{textblock}
+\end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[c]
-  \frametitle{CW\liningnums{9} (\liningnums{1} Part): Regexes}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c,fragile]
+\frametitle{Regular Expressions} 
+  
+Suppose you have a regular expression 
+\only<1-3>{\alert{\texttt{(a*)b}}}%
+\only<4->{\alert{\texttt{(a*)*b}}} :\bigskip
+
+\begin{center}
+\only<1>{\code{"aaaaaaaaaaaaaaab"}}
+\only<2>{\code{"aaaaa...........aaaaaaaaaaaaaaaaaaaab"}}
+\only<3>{\code{"aaaaa...........aaaaaaaaaaaaaaaaaaaa"}}
+\only<4>{\code{"aaaaa...........aaaaaaaaaaaaaaaaaaaab"}}
+\only<5->{\code{"aaaaa...........aaaaaaaaaaaaaaaaaaaa"}}
+\end{center}
+
+\only<6>{
+\begin{textblock}{13}(5,12)
+How long does Python need to find out?
+\end{textblock}}
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}<1>[c]
+  \frametitle{CW 9: Regexes}
   
 \begin{center}
-  Graphs: $(a^*)^* b$ and strings $\underbrace{\;a\ldots a\;}_{n}$\bigskip
+  Graphs: \alert{\texttt{(a*)*b}} and strings $\underbrace{\;\texttt{a}\ldots \texttt{a}\;}_{n}$\bigskip
   
 \begin{tabular}[t]{@{\hspace{-8mm}}c@{\hspace{-4mm}}c@{}}
 \only<1>{\raisebox{6mm}{\begin{tikzpicture}
@@ -421,26 +542,43 @@
 
 \hfill\small\url{https://vimeo.com/112065252}
 \end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
 \begin{frame}[c]
-\frametitle{Hint}
 
 \begin{center}
-\LARGE\textbf{\alert{Pattern-Matching}}
+  \includegraphics[angle=90,scale=0.35]{/Users/cu/vote.pdf}
 \end{center}
 
 \end{frame}
-
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
 
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
+\begin{frame}[c]
+
+\begin{center}
+  \includegraphics[scale=0.25]{/Users/cu/dresden.png}
+\end{center}
 
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[c,fragile]
-\frametitle{\alert{Questions?}}
+\begin{textblock}{13}(2,12)
+\includegraphics[scale=0.08]{/Users/cu/kiss.jpg}
+\end{textblock}
+
+\begin{textblock}{13}(6.8,12)
+\includegraphics[scale=0.079]{/Users/cu/pioniere.jpg}
+\end{textblock}
+
+\begin{textblock}{13}(11,12)
+\includegraphics[scale=0.20]{/Users/cu/iron.jpg}
+\end{textblock}
+
+\DOWNarrow{1}{11}{8.6}
 
 \end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
+