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Landon Curt Noll a1c86c8a7a add original C links to entry navigation bars
The navigation bar for a winning entry now has a "_Original C_" link
(between the ✅ and the Inventory on the right hand side) so that one
may easily view the original C code that was submitted for IOCCC judging.

Ran `make www timestamp` to perform the above.
2025-08-10 12:46:23 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>2020/endoh1 - Most explosive</h2>
<h3>Minesweeper solver</h3>
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<a class="Left" href="../carlini/index.html">&larr; 2020/carlini</a>
<a class="Left" href="../index.html">&uarr; 2020 &uarr;</a>
<a class="Left" href="../endoh2/index.html">2020/endoh2 &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2020/endoh1/prog.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Yusuke_Endoh">Yusuke Endoh</a><br>
Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em></li>
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<h2 id="to-build">To build:</h2>
<pre><code> make</code></pre>
<p>There is an alternate version provided by the author. See <a href="#alternate-code">Alternate
code</a> below.</p>
<h2 id="to-use">To use:</h2>
<p><strong>IMPORTANT for macOS</strong>: run under Terminal.app.</p>
<pre><code>
./prog</code></pre>
<h2 id="try">Try:</h2>
<p><strong>IMPORTANT for macOS</strong>: run under Terminal.app.</p>
<pre><code>
# Try resizing the terminal window before the first click.
# Try resizing the terminal window after the first click.
./prog ioccc.txt
./prog unwinnable.txt</code></pre>
<h2 id="alternate-code">Alternate code:</h2>
<p>An alternate version of this entry, <a href="https://github.com/ioccc-src/winner/blob/master/2020/endoh1/prog.alt.c">prog.alt.c</a>, is provided. This
alternate code lacks the additional rule to flag all unprobed cells. See the
Author’s remarks for more details.</p>
<h3 id="alternate-build">Alternate build:</h3>
<pre><code> make alt</code></pre>
<h3 id="alternate-use">Alternate use:</h3>
<p>Use <code>prog.alt</code> as you would <code>prog</code> above.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>When playing
<a href="https://en.wikipedia.org/wiki/Minesweeper_(video_game)">Minesweeper</a>, a
misclick might ruin a game, so why not leave the routine to the computer? This
program automatically uncovers mines according to several rules, and leaves
guessing (and applying the most straightforward of the rules – just for fun,
perhaps?) to the user.</p>
<p>Try creating your own input files according to the author’s remarks. Did you
encounter any problems?</p>
<p>The submission was in violation of the “2053” size rule by one character, likely
a late typo. It was easy to fix.</p>
<h3 id="for-macos">For macOS:</h3>
<p>We observe that this entry may not work under macOS using iTerm2.
Users on macOS might want to run this entry under the macOS Terminal,
which is located in <code>/System/Applications/Utilities/Terminal.app</code>.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="semi-automatic-minesweeper">Semi-automatic Minesweeper:</h3>
<p>Minesweeper is a game to sweep mines, as you know. The task consists of two parts:</p>
<ol start="0" type="1">
<li>Choose a random cell based on your sixth sense.</li>
<li>Identify a non-mine cell based on logical inference.</li>
</ol>
<p>However, (1) is error-prone, and a waste of time. You must use a computer to do
such a boring task!</p>
<p>This program is a semi-automatic minesweeper which does part (1) automatically.
All you have to do is (0). You can test if you are lucky or not.</p>
<h3 id="how-to-use">How to use:</h3>
<p>It uses ncurses:</p>
<pre><code> gcc -o prog prog.c -lncurses
./prog</code></pre>
<p>You will see a terminal-wide field of a minesweeper. Probe a cell by mouse
click.</p>
<p>If a cell turns out to have a mine (or not), the program determines whether its
neighbors have a mine or not, and automatically probes (or flags) the cell.</p>
<h3 id="keyboard-commands">Keyboard commands:</h3>
<ul>
<li><code>r</code>: new game (You can also click the smiley face at the top line.).</li>
<li><code>q</code>: quit.</li>
</ul>
<p>Input is case-sensitive.</p>
<h3 id="internals">Internals:</h3>
<p>The program uses four types of local inference:</p>
<h4 id="rule-1">Rule 1:</h4>
<p>If the number of a cell is equal to the count of the flagged neighbors, all the
unprobed neighbors are probed.</p>
<p>Example:</p>
<pre><code> ? ? ? . . .
? 3 ? =&gt; . 3 .
! ! ! ! ! !</code></pre>
<p>Note that <code>?</code> is an unprobed cell (it is unknown whether the cell has a mine or
not); <code>!</code> is a flagged cell (it is already known that the cell has a mine); and
<code>.</code> is a probed cell (it is already known that the cell has no mine).</p>
<h4 id="rule-2">Rule 2:</h4>
<p>If the number of a cell is equal to the count of the unprobed or flagged
neighbors, all the unprobed neighbors are flagged.</p>
<p>Example:</p>
<pre><code> . ? ? . ! !
. 4 ? =&gt; . 4 !
. 2 ! . 2 !</code></pre>
<h4 id="rule-3">Rule 3:</h4>
<p>Consider two number cells <code>A</code> and <code>B</code>. If <code>A</code> is equal to the difference of <code>B</code>
and the count of <code>B</code>’s unprobed and flagged neighbors that are not <code>A</code>’s
neighbors, all <code>A</code>’s unprobed neighbors that are not <code>B</code>’s neighbors are probed.</p>
<p>Example:</p>
<pre><code> ? ? ? . . .
? 1 ? ? =&gt; . 1 ? ?
? ? 4 . . ? 4 .
? . ! ? . !</code></pre>
<p><code>A</code> and <code>B</code> are probed cells whose numbers are, respectively, 1 and 4. The
count of <code>B</code>’s unprobed and flagged neighbors that are not <code>A</code>’s neighbors is
three (one <code>!</code> and two <code>?</code>s). Since <code>A == B - count</code> (<code>1 == 4 - 3</code>), the left
and top unprobed cells are probed.</p>
<h4 id="rule-4">Rule 4</h4>
<p>Consider two number cells <code>A</code> and <code>B</code>. If <code>B</code> is equal to the difference of <code>A</code>
and the count of <code>A</code>’s unprobed and flagged neighbors that are not <code>B</code>’s
neighbors, all of <code>A</code>’s unprobed neighbors that are not <code>B</code>’s neighbors are
flagged.</p>
<pre><code> ? ? ? ? ! ? ? ?
? 3 1 2 =&gt; ! 3 1 2
2 2 . . 2 2 . .</code></pre>
<p><code>A</code> and <code>B</code> are probed cells whose numbers are, respectively, 3 and 1. The
count of <code>A</code>’s unprobed and flagged neighbors that are not <code>B</code>’s neighbors is
two (left <code>?</code>s). Since <code>B == A - count</code> (<code>1 == 3 - 2</code>), the left unprobed cells
are flagged.</p>
<h3 id="note">Note</h3>
<p>Interestingly, these complex rules can be integrated to one simple rule.
Analyze the code.</p>
<h3 id="one-more-thing">One more thing</h3>
<p>You can also play with a prepared map.</p>
<pre><code> ./prog ioccc.txt</code></pre>
<p>The format of the text is:</p>
<pre><code> width height number-of-mines priorities-of-each-cell...</code></pre>
<p>There are mines in a cell whose “priorities-of-each-cell” is less than
“number-of-mines”. (But the mine in the first-clicked cell is removed.)</p>
<h3 id="bug-fixes-and-credits">Bug fixes and Credits</h3>
<p>The judges pointed out a bug of the original version that I submitted,
<a href="https://github.com/ioccc-src/winner/blob/master/2020/endoh1/prog.alt.c">prog.alt.c</a>. Because this program does not provide a feature to
flag unprobed cells manually, we can do nothing if the number of unprobed cells
are equal to the number of mines remaining; <a href="unwinnable.txt">unwinnable.txt</a> is
an example for such a case.</p>
<p>Thus, I implemented an additional rule to flag all unprobed cells in such a case
into the final version: <a href="https://github.com/ioccc-src/winner/blob/master/2020/endoh1/prog.c">prog.c</a>.</p>
<p><a href="../../authors.html#Ilya_Kurdyukov">Ilya Kurdyukov</a> also pointed out a warning
“ignoring return value of ‘fscanf’” only when <code>-O3</code> is used. So I changed the
code a little to pretend to use the return value of <code>fscanf(3)</code>.</p>
<p><a href="../../authors.html#Don_Yang">Don Yang</a> (omoikane) contributed another example map
<a href="megumin.txt">megumin.txt</a> which is the Explosion Arch-Wizard from KonoSuba.</p>
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<div id="inventory">
<h1 id="inventory-for-2020endoh1">Inventory for 2020/endoh1</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2020/endoh1/prog.c">prog.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2020/endoh1/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2020/endoh1/prog.alt.c">prog.alt.c</a> - alternate source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2020/endoh1/prog.orig.c">prog.orig.c</a> - original source code</li>
<li><a href="hilbert16x8.txt">hilbert16x8.txt</a> - example Minesweeper minefield map</li>
<li><a href="hilbert2x2.txt">hilbert2x2.txt</a> - example Minesweeper minefield map</li>
<li><a href="hilbert4x4.txt">hilbert4x4.txt</a> - example Minesweeper minefield map</li>
<li><a href="hilbert8x8.txt">hilbert8x8.txt</a> - example Minesweeper minefield map</li>
<li><a href="ioccc.txt">ioccc.txt</a> - example Minesweeper minefield map</li>
<li><a href="megumin.txt">megumin.txt</a> - example Minesweeper minefield map</li>
<li><a href="unwinnable.txt">unwinnable.txt</a> - example Minesweeper minefield map</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2020_endoh1.tar.bz2">2020_endoh1.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2020/endoh1/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2020/endoh1/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2020/endoh1/.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/2020/endoh1/.path">.path</a> - directory path from top level directory</li>
<li><a href="index.html">index.html</a> - this web page</li>
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