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<!DOCTYPE html>
<html lang="en-us">
<head>
<meta charset="utf-8"/>
<title>Day 4 - Advent of Code 2024</title>
<link rel="stylesheet" type="text/css" href="/static/style.css?31"/>
<link rel="stylesheet alternate" type="text/css" href="/static/highcontrast.css?1" title="High Contrast"/>
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<script>window.addEventListener('click', function(e,s,r){if(e.target.nodeName==='CODE'&&e.detail===3){s=window.getSelection();s.removeAllRanges();r=document.createRange();r.selectNodeContents(e.target);s.addRange(r);}});</script>
</head><!--
Oh, hello! Funny seeing you here.
I appreciate your enthusiasm, but you aren't going to find much down here.
There certainly aren't clues to any of the puzzles. The best surprises don't
even appear in the source until you unlock them for real.
Please be careful with automated requests; I'm not a massive company, and I can
only take so much traffic. Please be considerate so that everyone gets to play.
If you're curious about how Advent of Code works, it's running on some custom
Perl code. Other than a few integrations (auth, analytics, social media), I
built the whole thing myself, including the design, animations, prose, and all
of the puzzles.
The puzzles are most of the work; preparing a new calendar and a new set of
puzzles each year takes all of my free time for 4-5 months. A lot of effort
went into building this thing - I hope you're enjoying playing it as much as I
enjoyed making it for you!
If you'd like to hang out, I'm @was.tl on Bluesky, @[email protected] on
Mastodon, and @ericwastl on Twitter.
- Eric Wastl
-->
<body>
<div id="sidebar">
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<main>
<article class="day-desc"><h2>--- Day 4: Ceres Search ---</h2><p>"Looks like the Chief's not here. Next!" One of The Historians pulls out a device and pushes the only button on it. After a brief flash, you recognize the interior of the <a href="/2019/day/10">Ceres monitoring station</a>!</p>
<p>As the search for the Chief continues, a small Elf who lives on the station tugs on your shirt; she'd like to know if you could help her with her <em>word search</em> (your puzzle input). She only has to find one word: <code>XMAS</code>.</p>
<p>This word search allows words to be horizontal, vertical, diagonal, written backwards, or even overlapping other words. It's a little unusual, though, as you don't merely need to find one instance of <code>XMAS</code> - you need to find <em>all of them</em>. Here are a few ways <code>XMAS</code> might appear, where irrelevant characters have been replaced with <code>.</code>:<p>
<pre><code>..X...
.SAMX.
.A..A.
XMAS.S
.X....
</code></pre>
<p>The actual word search will be full of letters instead. For example:</p>
<pre><code>MMMSXXMASM
MSAMXMSMSA
AMXSXMAAMM
MSAMASMSMX
XMASAMXAMM
XXAMMXXAMA
SMSMSASXSS
SAXAMASAAA
MAMMMXMMMM
MXMXAXMASX
</code></pre>
<p>In this word search, <code>XMAS</code> occurs a total of <code><em>18</em></code> times; here's the same word search again, but where letters not involved in any <code>XMAS</code> have been replaced with <code>.</code>:</p>
<pre><code>....XXMAS.
.SAMXMS...
...S..A...
..A.A.MS.X
XMASAMX.MM
X.....XA.A
S.S.S.S.SS
.A.A.A.A.A
..M.M.M.MM
.X.X.XMASX
</code></pre>
<p>Take a look at the little Elf's word search. <em>How many times does <code>XMAS</code> appear?</em></p>
</article>
<p>Your puzzle answer was <code>2551</code>.</p><article class="day-desc"><h2 id="part2">--- Part Two ---</h2><p>The Elf looks quizzically at you. Did you misunderstand the assignment?</p>
<p>Looking for the instructions, you flip over the word search to find that this isn't actually an <code><em>XMAS</em></code> puzzle; it's an <span title="This part originally involved searching for something else, but this joke was too dumb to pass up."><code><em>X-MAS</em></code></span> puzzle in which you're supposed to find two <code>MAS</code> in the shape of an <code>X</code>. One way to achieve that is like this:</p>
<pre><code>M.S
.A.
M.S
</code></pre>
<p>Irrelevant characters have again been replaced with <code>.</code> in the above diagram. Within the <code>X</code>, each <code>MAS</code> can be written forwards or backwards.</p>
<p>Here's the same example from before, but this time all of the <code>X-MAS</code>es have been kept instead:</p>
<pre><code>.M.S......
..A..MSMS.
.M.S.MAA..
..A.ASMSM.
.M.S.M....
..........
S.S.S.S.S.
.A.A.A.A..
M.M.M.M.M.
..........
</code></pre>
<p>In this example, an <code>X-MAS</code> appears <code><em>9</em></code> times.</p>
<p>Flip the word search from the instructions back over to the word search side and try again. <em>How many times does an <code>X-MAS</code> appear?</em></p>
</article>
<p>Your puzzle answer was <code>1985</code>.</p><p class="day-success">Both parts of this puzzle are complete! They provide two gold stars: **</p>
<p>At this point, you should <a href="/2024">return to your Advent calendar</a> and try another puzzle.</p>
<p>If you still want to see it, you can <a href="4/input" target="_blank">get your puzzle input</a>.</p>
<p>You can also <span class="share">[Share<span class="share-content">on
<a href="https://bsky.app/intent/compose?text=I%27ve+completed+%22Ceres+Search%22+%2D+Day+4+%2D+Advent+of+Code+2024+%23AdventOfCode+https%3A%2F%2Fadventofcode%2Ecom%2F2024%2Fday%2F4" target="_blank">Bluesky</a>
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