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year2015_day4_puzzle.html
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<!DOCTYPE html>
<html lang="en-us">
<head>
<meta charset="utf-8"/>
<title>Day 4 - Advent of Code 2015</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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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 @ericwastl@hachyderm.io on Mastodon and
@ericwastl on Twitter.
- Eric Wastl
-->
<body>
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<main>
<article class="day-desc"><h2>--- Day 4: The Ideal Stocking Stuffer ---</h2><p>Santa needs help <a href="https://en.wikipedia.org/wiki/Bitcoin#Mining">mining</a> some <span title="Hey, mined your own business!">AdventCoins</span> (very similar to <a href="https://en.wikipedia.org/wiki/Bitcoin">bitcoins</a>) to use as gifts for all the economically forward-thinking little girls and boys.</p>
<p>To do this, he needs to find <a href="https://en.wikipedia.org/wiki/MD5">MD5</a> hashes which, in <a href="https://en.wikipedia.org/wiki/Hexadecimal">hexadecimal</a>, start with at least <em>five zeroes</em>. The input to the MD5 hash is some secret key (your puzzle input, given below) followed by a number in decimal. To mine AdventCoins, you must find Santa the lowest positive number (no leading zeroes: <code>1</code>, <code>2</code>, <code>3</code>, ...) that produces such a hash.</p>
<p>For example:</p>
<ul>
<li>If your secret key is <code>abcdef</code>, the answer is <code>609043</code>, because the MD5 hash of <code>abcdef609043</code> starts with five zeroes (<code>000001dbbfa...</code>), and it is the lowest such number to do so.</li>
<li>If your secret key is <code>pqrstuv</code>, the lowest number it combines with to make an MD5 hash starting with five zeroes is <code>1048970</code>; that is, the MD5 hash of <code>pqrstuv1048970</code> looks like <code>000006136ef...</code>.</li>
</ul>
</article>
<p>Your puzzle answer was <code>282749</code>.</p><article class="day-desc"><h2 id="part2">--- Part Two ---</h2><p>Now find one that starts with <em>six zeroes</em>.</p>
</article>
<p>Your puzzle answer was <code>9962624</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="/2015">return to your Advent calendar</a> and try another puzzle.</p>
<p>Your puzzle input was <code class="puzzle-input">yzbqklnj</code>.</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+%22The+Ideal+Stocking+Stuffer%22+%2D+Day+4+%2D+Advent+of+Code+2015&url=https%3A%2F%2Fadventofcode%2Ecom%2F2015%2Fday%2F4&related=ericwastl&hashtags=AdventOfCode" target="_blank">Twitter</a>
<a href="javascript:void(0);" onclick="var ms; try{ms=localStorage.getItem('mastodon.server')}finally{} if(typeof ms!=='string')ms=''; ms=prompt('Mastodon Server?',ms); if(typeof ms==='string' && ms.length){this.href='https://'+ms+'/share?text=I%27ve+completed+%22The+Ideal+Stocking+Stuffer%22+%2D+Day+4+%2D+Advent+of+Code+2015+%23AdventOfCode+https%3A%2F%2Fadventofcode%2Ecom%2F2015%2Fday%2F4';try{localStorage.setItem('mastodon.server',ms);}finally{}}else{return false;}" target="_blank">Mastodon</a
></span>]</span> this puzzle.</p>
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