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<h1>The International Obfuscated C Code Contest</h1>
<h2>2006/night - Best abuse of computation</h2>
<h3>A maze game</h3>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2006/night/night.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Christopher_Night">Christopher Night</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make</code></pre>
<p>There is an alternate version that supports arrow keys. See the <a href="#alternate-code">Alternate
code</a> section below.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./night</code></pre>
<h2 id="alternate-code">Alternate code:</h2>
<p>This version allows you to use arrow keys instead of the more awkward <code>wasd</code>
keys.</p>
<h3 id="alternate-build">Alternate build:</h3>
<pre><code> make alt</code></pre>
<h3 id="alternate-use">Alternate use:</h3>
<p>Use <code>night.alt</code> as you would <code>night</code> above.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>You’d never guess, from looking at the code, that there is a <a href="https://towardsdatascience.com/introduction-to-genetic-algorithms-including-example-code-e396e98d8bf3">genetic
algorithm</a>
involved. Somewhere. But what does it do? Well, it might take you a while to
navigate the results, let alone the code.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>Don’t worry; this is not a self-reproducing program, as you might at
first guess from the layout. I would never be so foolhardy as to
submit an entry on an overused theme!</p>
<p>Oh, wait a second… it is a maze-generating program. Oops!</p>
<h3 id="what-it-does">What it does:</h3>
<p>This program solves an optimization problem, namely, generating a challenging
maze. It uses a very simple genetic algorithm: a maze layout’s
<a href="https://en.wikipedia.org/wiki/DNA">DNA</a> is represented as a 32-bit integer, and
mutations consist of flipping three different bits. The algorithm is simple in
that it doesn’t employ sexual reproduction, only mutations, and it has a
population size of 1. So much for diversity!</p>
<p>This particular optimization problem, I believe, has a unique maximum:
there is but one maze out of <code>2^32</code> that requires 64 moves to solve. The
program will run until finding this global maximum, or if you get
bored, you can accept a sub-optimal solution by pressing any key. On
my system, it takes an average of 15 minutes to find the maximum,
whereas a random search would take an average of 3.5 days.</p>
<p>Should you take my word for it that the maze it generates requires as many moves
as I say it does? The answer is yes. But if you’re not convinced, you can try to
solve it yourself. The goal is to traverse from the upper-left to the
upper-right and out the top, where the number of moves remaining is printed. Use
the arrow keys for suckers (<code>w</code>, <code>a</code>, <code>s</code>, <code>d</code>) to move around. <code>q</code> quits and
<code>r</code> restarts. Also, the maze changes as you move through it, in a predictable
way. It should be easy enough to figure out the pattern. For best results, use a
display with bold-text capabilities and color.</p>
<p>Finally, in the world of DNA, the medium is truly the message. There’s
a short message encoded in here that will only appear when you
complete the optimal maze in the required 64 moves.</p>
<h3 id="issues">Issues:</h3>
<p>These depend on your compiler, and they were all intentionally
added for obfuscation purposes. No, really!</p>
<p>My compiler warns of nulls in a string literal, and the redefinition
of the macro <code>T</code>.</p>
<p>With one compiler, compilation took about two minutes.</p>
<p><code>sizeof(unsigned short)</code> must be 2, and <code>sizeof(unsigned long)</code> must be 4.</p>
<p><code>CLOCKS_PER_SEC</code> is assumed to be <code>1000000</code>. If it’s a lot less than that,
expect delays.</p>
<h3 id="algorithmic-obfuscation">Algorithmic obfuscation:</h3>
<p>The representation of the maze layout in a 32-bit integer type is
pretty opaque. As a hint, the optimum layout’s DNA is, in base 4,
<code>2102231031201230</code>. Try getting from there to the maze that appears on
screen.</p>
<p>The recursive function <code>CGAC()</code> replaces a nested for loop in a handy way.</p>
<p>The maze-solving function <code>TGA()</code> returns no solution both if no solution
exists, and if the search space grows too large, with a single test.</p>
<h3 id="stylistic-obfuscation">Stylistic obfuscation:</h3>
<p>Four-letter alphabets are confusing. I don’t know how
<a href="https://en.wikipedia.org/wiki/Ribosome">ribosomes</a> manage.</p>
<p>Overloaded symbols, such as <code>G</code> and <code>G()</code>.</p>
<p>Who needs <code>!=</code> when you’ve got <code>^</code>?</p>
<p>Who needs <code>if</code> when you’ve got <code>while</code>?</p>
<p>For that matter, who needs fixed-iteration-count <code>for</code> and <code>while</code> when you can
just duplicate code with the preprocessor? Duplication by this macro causes one
particular graphics line to be replicated 512 times. On my system the
preprocessed code is over 80KB in length, hindering the preprocessor’s ability
to deobfuscate.</p>
<p>Keypad support was removed to save space. To restore, modify the
following two macros to:</p>
<pre><code> #define ATG srand(time(0)); initscr(); cbreak(); noecho(); start_color(); keypad(stdscr,1);
#define AGG A&2?KEY_UP:KEY_DOWN:A&1?KEY_RIGHT:KEY_LEFT</code></pre>
<p>Code on!</p>
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<h1 id="inventory-for-2006night">Inventory for 2006/night</h1>
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<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2006/night/night.c">night.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2006/night/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2006/night/night.alt.c">night.alt.c</a> - alternate source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2006/night/night.orig.c">night.orig.c</a> - original source code</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2006_night.tar.bz2">2006_night.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2006/night/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2006/night/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2006/night/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2006/night/.path">.path</a> - directory path from top level directory</li>
<li><a href="index.html">index.html</a> - this web page</li>
</ul>
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