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-<title>Day 1 - Advent of Code 2017</title>
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-Oh, hello! Funny seeing you here.
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-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 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 took an hour or two
-each, but the harder ones took 4-5 hours, and a few 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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--->
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-<header><div><h1 class="title-global"><a href="/">Advent of Code</a></h1><nav><ul><li><a href="/2017/about">[About]</a></li><li><a href="/2017/support">[AoC++]</a></li><li><a href="/2017/events">[Events]</a></li><li><a href="/2017/settings">[Settings]</a></li><li><a href="/2017/auth/logout">[Log Out]</a></li></ul></nav><div class="user">Neil Smith <span class="supporter">(AoC++)</span> <span class="star-count">4*</span></div></div><div><h1 class="title-event"> <span class="title-event-wrap">λy.</span><a href="/2017">2017</a><span class="title-event-wrap"></span></h1><nav><ul><li><a href="/2017">[Calendar]</a></li><li><a href="/2017/leaderboard">[Leaderboard]</a></li><li><a href="/2017/stats">[Stats]</a></li><li><a href="/2017/sponsors">[Sponsors]</a></li></ul></nav></div></header>
-
-<div id="sidebar">
-<div id="sponsor"><div class="quiet">Our <a href="/2017/sponsors">sponsors</a> help make Advent of Code possible:</div><p><a href="https://cheppers.com/" target="_blank" onclick="if(ga)ga('send','event','sponsor','click',this.href);" rel="noopener">Cheppers</a> - xor(Pz0pQUI7Ch cmER8YDAEYAh4L GwEP, ↑↑↓↓←→←→BA)</p></div>
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-<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
-<!-- Advent of Code Wide Skyscraper -->
-<ins class="adsbygoogle"
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-
-<main>
-<article class="day-desc"><h2>--- Day 1: Inverse Captcha ---</h2><p>The night before Christmas, one of Santa's Elves calls you in a panic. "The printer's broken! We can't print the <em>Naughty or Nice List</em>!" By the time you make it to <span title="Floor 17: cafeteria, printing department, and experimental organic digitization equipment.">sub-basement 17</span>, there are only a few minutes until midnight. "We have a big problem," she says; "there must be almost <em>fifty</em> bugs in this system, but nothing else can print The List. Stand in this square, quick! There's no time to explain; if you can convince them to pay you in <em class="star">stars</em>, you'll be able to--" She pulls a lever and the world goes blurry.</p>
-<p>When your eyes can focus again, everything seems a lot more pixelated than before. She must have sent you inside the computer! You check the system clock: <em>25 milliseconds</em> until midnight. With that much time, you should be able to collect all <em class="star">fifty stars</em> by December 25th.</p>
-<p>Collect stars by solving puzzles. Two puzzles will be made available on each <s style="text-decoration-color:#fff;">day</s> millisecond in the advent calendar; the second puzzle is unlocked when you complete the first. Each puzzle grants <em class="star">one star</em>. Good luck!</p>
-<p>You're standing in a room with "digitization quarantine" written in LEDs along one wall. The only door is locked, but it includes a small interface. "Restricted Area - Strictly No Digitized Users Allowed."</p>
-<p>It goes on to explain that you may only leave by solving a <a href="https://en.wikipedia.org/wiki/CAPTCHA">captcha</a> to prove you're <em>not</em> a human. Apparently, you only get one millisecond to solve the captcha: too fast for a normal human, but it feels like hours to you.</p>
-<p>The captcha requires you to review a sequence of digits (your puzzle input) and find the <em>sum</em> of all digits that match the <em>next</em> digit in the list. The list is circular, so the digit after the last digit is the <em>first</em> digit in the list.</p>
-<p>For example:</p>
-<ul>
-<li><code>1122</code> produces a sum of <code>3</code> (<code>1</code> + <code>2</code>) because the first digit (<code>1</code>) matches the second digit and the third digit (<code>2</code>) matches the fourth digit.</li>
-<li><code>1111</code> produces <code>4</code> because each digit (all <code>1</code>) matches the next.</li>
-<li><code>1234</code> produces <code>0</code> because no digit matches the next.</li>
-<li><code>91212129</code> produces <code>9</code> because the only digit that matches the next one is the last digit, <code>9</code>.</li>
-</ul>
-<p><em>What is the solution</em> to your captcha?</p>
-</article>
-<p>Your puzzle answer was <code>1158</code>.</p><article class="day-desc"><h2>--- Part Two ---</h2><p>You notice a progress bar that jumps to 50% completion. Apparently, the door isn't yet satisfied, but it did emit a <em class="star">star</em> as encouragement. The instructions change:</p>
-<p>Now, instead of considering the <em>next</em> digit, it wants you to consider the digit <em>halfway around</em> the circular list. That is, if your list contains <code>10</code> items, only include a digit in your sum if the digit <code>10/2 = 5</code> steps forward matches it. Fortunately, your list has an even number of elements.</p>
-<p>For example:</p>
-<ul>
-<li><code>1212</code> produces <code>6</code>: the list contains <code>4</code> items, and all four digits match the digit <code>2</code> items ahead.</li>
-<li><code>1221</code> produces <code>0</code>, because every comparison is between a <code>1</code> and a <code>2</code>.</li>
-<li><code>123425</code> produces <code>4</code>, because both <code>2</code>s match each other, but no other digit has a match.</li>
-<li><code>123123</code> produces <code>12</code>.</li>
-<li><code>12131415</code> produces <code>4</code>.</li>
-</ul>
-<p><em>What is the solution</em> to your new captcha?</p>
-</article>
-<p>Your puzzle answer was <code>1132</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="/2017">return to your advent calendar</a> and try another puzzle.</p>
-<p>If you still want to see it, you can <a href="1/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://twitter.com/intent/tweet?text=I%27ve+completed+%22Inverse+Captcha%22+%2D+Day+1+%2D+Advent+of+Code+2017&url=http%3A%2F%2Fadventofcode%2Ecom%2F2017%2Fday%2F1&related=ericwastl&hashtags=AdventOfCode" target="_blank">Twitter</a>
- <a href="https://plus.google.com/share?url=http%3A%2F%2Fadventofcode%2Ecom%2F2017%2Fday%2F1" target="_blank">Google+</a>
- <a href="http://www.reddit.com/submit?url=http%3A%2F%2Fadventofcode%2Ecom%2F2017%2Fday%2F1&title=I%27ve+completed+%22Inverse+Captcha%22+%2D+Day+1+%2D+Advent+of+Code+2017" target="_blank">Reddit</a
-></span>]</span> this puzzle.</p>
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