Add preview of 1984-2019

The 2020 winners are hinted it, but the source code is not there,
nor are the hints. Someone could look into the HTML and
see what was commented out, but that is not a problem because
WHO won is known and the name of their AWARD is known already.
Moreover a number of the winners have talked about what their
entirs do, so the commented out spoiler text is not a bit problem.

One will find HTML commented out with:

    <!-- XXX remove when 2020 is ready
    2020 links here
    XXX remove when 2020 is ready -->

The "XXX remove when 2020 is ready" string is found at the
start and end comment blocks.  Again, soneone could read
what was commented out, but that is OK since most of that
information is known or can be known.  The following files
have such HTML comment blocks in them.

    ./winners.html
    ./years-spoiler.html
    ./years.html

In addition, ./all/summary.txt was modified to not
include the 2020 entries for the momemt.

The 2020 winner code AND write-ups are NOT part of this set.

p.s. The all/all.tar.bz2 does not contain the 2020 source code (yet?).

2006/sloane/Makefile

@@ -0,0 +1,35 @@
+# 2006 makefile
+#
+# Copyright (C) 2006-2009, Landon Curt Noll, Simon Cooper, Peter Seebach
+# and Leonid A. Broukhis. All Rights Reserved. Permission for personal,
+# educational or non-profit use is granted provided this copyright and
+# notice are included in its entirety and remains unaltered.  All other
+# uses must receive prior permission from the contest judges.
+
+# Special flags for this entry
+#
+LOCAL_FLAGS= ${CFLAGS} -lm
+
+# data files for this entry
+#
+DATA=
+
+
+build: ${ENTRY}
+
+
+clean:
+	-${RM} ${ENTRY} ${ENTRY}_orig
+
+
+clobber: clean
+
+
+alt:
+
+
+data:
+
+
+${ENTRY}: ${ENTRY}.c ${DATA}
+	${CC} ${LOCAL_FLAGS} ${ENTRY}.c -o ${ENTRY}

2006/sloane/hint.text

@@ -0,0 +1,74 @@
+# Homer's Favorite
+
+Andy Sloane
+1041 Seneca St.
+Hartford, WI 53027
+US
+
+## Judges' Comments:
+
+### To build:
+
+        make slone
+
+### To run:
+
+        ./sloane
+
+Looks almost good enough to eat, dunnit?  I suppose you could argue that,
+at first blush, this looks like a self-reproducing program.
+
+## Selected Author's Comments:
+
+This program doesn't require any special build options, other than that it
+uses sin and cos and hence requires the math library.
+
+You will almost certainly get a compiler warning because I declared a bunch
+of global ints without types.  The code looks better this way, though, I
+think.  There are also no #includes, so there may be warnings for
+undeclared references to printf, etc.  There's a chance that my failure to
+include math.h or declare sin or cos will make the donut not render
+properly -- it's worked on every system I've tried so far though.
+
+You will need some kind of VT100-ish emulation; so while this compiles and
+runs OK in Windows, you will need PuTTYcyg or something like that.
+
+The shape of the source gives a hint about its output: it's a little
+animation of a shaded donut rotating over an infinite checkerboard.  Like
+many IOCCC entries, it is thus self-documenting.
+
+I wanted to create something as "pure" as I could - meaning that the
+entire source code is shaped into a work of art, without being prefixed
+by any #define hacks, or even #includes, _and_ is portable enough to not
+require any special libraries to do the animating.  I achieved this with
+two standard escape codes for clearing the screen and moving the cursor
+back to the top-left.
+
+The donut isn't raytraced.  It's much simpler than that.
+
+### How is it obfuscated?
+
+There are three main pieces to this program: the donut, the checkerboard,
+and the ASCII logo.  The first two are programmed in a straightforward way
+(with z-buffering even!), but the mathematics for drawing them is
+"optimized".  The ASCII logo has been shrunk into the smallest I could make
+it by any means necessary.
+
+The logo can actually be compressed much better (ironically, by doing
+something simpler), but I didn't discover this until well after submitting.
+
+### Puzzles
+
+In increasing order of difficulty:
+
+ - Can you change the shading of the donut and checkerboard?
+
+ - Can you change the movement rates of the donut, the checkerboard, and
+   the scrolling logo?
+
+ - Can you change the inner/outer radii of the donut?  The height/scaling
+   of the checkerboard?
+
+ - How is the "IOCCC 2006" logo encoded?  Can you put something else in its
+   place?  Can you find a smaller encoding?
+

2006/sloane/sloane.c

@@ -0,0 +1,32 @@
+_,x,y,o       ,N;char       b[1920]       ;p(n,c)
+{for(;n       --;x++)       c==10?y       +=80,x=
+o-1:x>=       0?80>x?             c       !='~'?b
+[y+x]=c       :0:                         0:0;}c(
+       q,l,r)       char*l,*r;{while             (q>=0)q
+       =("E"    "?yYrIxC{e^}KhE>[|LXbj}"         "dOVsJ"
+       "@"    "idOV{Yab[bW}[bW}\\qFywyv{D"       "ma\\A"
+       ""   "Ztq?Lyw>e{|Zq>Y\\gq\\qI[tYBe{w"     "yvDZE\
+vBA[`_"    "Lo>}KcqdYrWqKxzKtW]|DXRwsfcUaT\\\
+KXw{Y"   "RsFwsFwsFw{zaqyaz|FmMpyaoyI\\]cuUw{J"
+[_/6]   -62>>_++%6&1?r[q]:l[q])-99;return q;}E(a
+){for   (o=x=a,y=0,_=0;_        <1006;)a=" /\\\n"
+       "~|_."[c(6,"b"              "cd\\a[g","^`"   "_e"
+       "]fh")+8], p(   "#$%"        "&'()*+,-.1"[   c(11
+      ,"_ac[]\\YZi"   "jkm",         "`bd^efghXWlV" )+13
+      ]-34,a);}main   (k,Z){         float z[1920]  ,A=0
+,B=0  ,i,j; puts(""         "\x1b"   "[2J");for(;;
+)  {  float e=sin(A         ),  n=   sin(B),g=cos(
+A),m   =cos(B);for(k        =0;k<   1840;k++)y=-k
+/80-   10,o=41+(k%80-              40)*1.3/y+n,N=
+        A-100.0/y, b[k]=        ".#"[o+N&1],z[k]   =0;E(
+        80-(int)(9*B)%250);for(j=0;6.28>j;j+=0.07  )for(
+         i=0;6.28>i;i+=0.02) { float c=sin(i),d   =cos(j
+           ),f=sin(j),h=d+2,D=15/(c*h*e+f*g+5    ),l=cos
+(i),t=c     *h*g-f*e;x=40+2*D*(l*h*m-t*n),y=   12
++D*(l*h       *n+t*m),o=x+80*y,N=8*((f*e-c    *d*
+g)*m-c*         d*e-f*g-l*d*n);if(D>z[o]    )z[o]
+=D,b[o]             =" ..,,-++=#$@"[      N>0?N:0
+       ]  ;  }                                   printf(
+       "\x1b["       "H"           );for(k       =1;1841
+       >k;k++)       putchar       (k%80?b       [k]:10)
+       ;  A +=       0.053;B       +=0.037       ;  }  }