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+<title>Day 16 - Advent of Code</title>
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+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. You do risk spoiling a few
+surprises for yourself, though. Best to play the normal way and discover
+everything as it was intended, I think. 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 Google, 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, ads, social media),
+I built the whole thing myself, including the design, animations, prose, and
+all of the puzzles.
+
+The puzzles probably took the longest; the easiest ones were around 45 minutes
+each, but the harder ones took 2-3 hours, some even longer than that. 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 @ericwastl on Twitter.
+
+- Eric Wastl
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+-->
+<body>
+<header><h1><a href="/">Advent of Code</a></h1><div class="user">Neil Smith <span class="star-count">32*</span></div><nav><ul><li><a href="/about">[About]</a></li><li><a href="/stats">[Stats]</a></li><li><a href="/leaderboard">[Leaderboard]</a></li><li><a href="/settings">[Settings]</a></li><li><a href="/auth/logout">[Log out]</a></li></ul></nav></header>
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+<main>
+<article class="day-desc"><h2>--- Day 16: Aunt Sue ---</h2><p>Your Aunt Sue has given you a wonderful gift, and you'd like to send her a thank you card. However, there's a small problem: she signed it "From, Aunt Sue".</p>
+<p>You have 500 Aunts named "Sue".</p>
+<p>So, to avoid sending the card to the wrong person, you need to figure out which Aunt Sue (which you conveniently number 1 to 500, for sanity) gave you the gift. You open the present and, as luck would have it, good ol' Aunt Sue got you a My First Crime Scene Analysis Machine! Just what you wanted. Or needed, as the case may be.</p>
+<p>The My First Crime Scene Analysis Machine (MFCSAM for short) can detect a few specific compounds in a given sample, as well as how many distinct kinds of those compounds there are. According to the instructions, these are what the MFCSAM can detect:</p>
+<ul>
+<li><code>children</code>, by human DNA age analysis.</li>
+<li><code>cats</code>. It doesn't differentiate individual breeds.</li>
+<li>Several <span title="It can tell them apart by their distinct Dog Residue.">seemingly random breeds of dog</span>: <code><a href="https://en.wikipedia.org/wiki/Samoyed_%28dog%29">samoyeds</a></code>, <code><a href="https://en.wikipedia.org/wiki/Pomeranian_%28dog%29">pomeranians</a></code>, <code><a href="https://en.wikipedia.org/wiki/Akita_%28dog%29">akitas</a></code>, and <code><a href="https://en.wikipedia.org/wiki/Vizsla">vizslas</a></code>.</li>
+<li><code>goldfish</code>. No other kinds of fish.</li>
+<li><code>trees</code>, all in one group.</li>
+<li><code>cars</code>, presumably by exhaust or gasoline or something.</li>
+<li><code>perfumes</code>, which is handy, since many of your Aunts Sue wear a few kinds.</li>
+</ul>
+<p>In fact, many of your Aunts Sue have many of these. You put the wrapping from the gift into the MFCSAM. It beeps inquisitively at you a few times and then prints out a message on <a href="https://en.wikipedia.org/wiki/Ticker_tape">ticker tape</a>:</p>
+<pre><code>children: 3
+cats: 7
+samoyeds: 2
+pomeranians: 3
+akitas: 0
+vizslas: 0
+goldfish: 5
+trees: 3
+cars: 2
+perfumes: 1
+</code></pre>
+<p>You make a list of the things you can remember about each Aunt Sue. Things missing from your list aren't zero - you simply don't remember the value.</p>
+<p>What is the <em>number</em> of the Sue that got you the gift?</p>
+</article>
+<p>Your puzzle answer was <code>40</code>.</p><article class="day-desc"><h2>--- Part Two ---</h2><p>As you're about to send the thank you note, something in the MFCSAM's instructions catches your eye. Apparently, it has an outdated <a href="https://www.youtube.com/watch?v=RXJKdh1KZ0w">retroencabulator</a>, and so the output from the machine isn't exact values - some of them indicate ranges.</p>
+<p>In particular, the <code>cats</code> and <code>trees</code> readings indicates that there are <em>greater than</em> that many (due to the unpredictable nuclear decay of cat dander and tree pollen), while the <code>pomeranians</code> and <code>goldfish</code> readings indicate that there are <em>fewer than</em> that many (due to the modial interaction of magnetoreluctance).</p>
+<p>What is the <em>number</em> of the real Aunt Sue?</p>
+</article>
+<p>Your puzzle answer was <code>241</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="/">return to your advent calendar</a> and try another puzzle.</p>
+<p>If you still want to see it, you can <a href="/day/16/input" target="_blank">get your puzzle input</a>.</p>
+<p>You can also <span class="share">[Share<span class="share-content">on
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+ this puzzle.</p>
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projects / advent-of-code-15.git / blobdiff