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Add Antoine Mathys's solution to the 2025/ferguson fun challenge 4. #290

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lcn2 merged 2 commits into from
Jul 12, 2026
Merged

Add Antoine Mathys's solution to the 2025/ferguson fun challenge 4. #290

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9d882db
Add Antoine Mathys's solution to the 2025/ferguson fun challenge 4.
antoine-mathys Jul 11, 2026
1ab6665
update 2025/challenge.html and sitemap
lcn2 Jul 12, 2026
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7 changes: 6 additions & 1 deletion 2025/challenge.html
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Original file line number Diff line number Diff line change
Expand Up @@ -658,13 +658,18 @@ <h3 id="fun-challenge-3-for-2025ferguson">Fun challenge 3 for <a href="ferguson/
<div id="ferguson_4">
<h3 id="fun-challenge-4-for-2025ferguson">Fun challenge 4 for <a href="ferguson/index.html">2025/ferguson</a></h3>
</div>
<p>This fun challenge is still <strong>OPEN</strong>.</p>
<p>This fun challenge is <strong>CLOSED</strong>.</p>
<p>Explain why <code>d</code> has to start at <code>-1</code> (bonus: experiment with different values
and explain what happens and specifically why) and why you can’t change
the <code>!=1</code> in the code:</p>
<pre><code> if (d=(c!=e==!d!=d!=d==1&amp;&amp;e!=c)!=1||/* NOW YOU KNOW d IS 1! */fread(c, -*(S[F])-d*3 ,
b*j,q)^j *j *2)X;</code></pre>
<p><strong>Hint</strong>: the above are related to each other.</p>
<div id="ferguson_4_solution">
<h4 id="fun-challenge-solution-for-2025ferguson">Fun challenge solution for <a href="ferguson/index.html">2025/ferguson</a></h4>
</div>
<p><a href="https://github.com/antoine-mathys">Antoine Mathys</a> on <strong>2026 Jul 11</strong> presented this
<a href="https://github.com/antoine-mathys/IOCCC-2025-ferguson-fun-challenge-4">2025/ferguson fun challenge 4 solution</a>.</p>
<div id="howe">
<h2 id="fun-challenge-for-2025howe">Fun challenge for <a href="howe/index.html">2025/howe</a></h2>
</div>
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9 changes: 8 additions & 1 deletion 2025/challenge.md
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Expand Up @@ -327,7 +327,7 @@ with a `-p projection` option.
### Fun challenge 4 for [2025/ferguson](ferguson/index.html)
</div>

This fun challenge is still **OPEN**.
This fun challenge is **CLOSED**.

Explain why `d` has to start at `-1` (bonus: experiment with different values
and explain what happens and specifically why) and why you can't change
Expand All @@ -340,6 +340,13 @@ the `!=1` in the code:

**Hint**: the above are related to each other.

<div id="ferguson_4_solution">
#### Fun challenge solution for [2025/ferguson](ferguson/index.html)
</div>

[Antoine Mathys](https://github.com/antoine-mathys) on **2026 Jul 11** presented this
[2025/ferguson fun challenge 4 solution](https://github.com/antoine-mathys/IOCCC-2025-ferguson-fun-challenge-4).


<div id="howe">
## Fun challenge for [2025/howe](howe/index.html)
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4 changes: 2 additions & 2 deletions sitemap.xml
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Expand Up @@ -15994,11 +15994,11 @@
</url>
<url>
<loc>https://www.ioccc.org/2025/challenge.html</loc>
<lastmod>2026-07-10T16:42:52+00:00</lastmod>
<lastmod>2026-07-12T02:38:02+00:00</lastmod>
</url>
<url>
<loc>https://www.ioccc.org/2025/challenge.md</loc>
<lastmod>2026-07-10T16:35:52+00:00</lastmod>
<lastmod>2026-07-12T02:37:04+00:00</lastmod>
</url>
<url>
<loc>https://www.ioccc.org/2025/diels-grabsch/2025_diels-grabsch.tar.bz2</loc>
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