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year2016_day3_puzzle.html
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<!DOCTYPE html>
<html lang="en-us">
<head>
<meta charset="utf-8"/>
<title>Day 3 - Advent of Code 2016</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"/>
<link rel="shortcut icon" href="/favicon.png"/>
<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 @ericwastl@hachyderm.io on Mastodon and
@ericwastl on Twitter.
- Eric Wastl
-->
<body>
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<main>
<article class="day-desc"><h2>--- Day 3: Squares With Three Sides ---</h2><p>Now that you can think clearly, you move deeper into the labyrinth of hallways and office furniture that makes up this part of Easter Bunny HQ. This must be a graphic design department; the walls are covered in specifications for triangles.</p>
<p>Or are they?</p>
<p>The design document gives the side lengths of each triangle it describes, but... <code>5 10 25</code>? Some of these aren't triangles. You can't help but mark the impossible ones.</p>
<p>In a valid triangle, the sum of any two sides must be larger than the remaining side. For example, the "triangle" given above is <span title="Unless it's on a sphere!">impossible</span>, because <code>5 + 10</code> is not larger than <code>25</code>.</p>
<p>In your puzzle input, <em>how many</em> of the listed triangles are <em>possible</em>?</p>
</article>
<p>Your puzzle answer was <code>993</code>.</p><article class="day-desc"><h2 id="part2">--- Part Two ---</h2><p>Now that you've helpfully marked up their design documents, it occurs to you that triangles are specified in groups of three <em>vertically</em>. Each set of three numbers in a column specifies a triangle. Rows are unrelated.</p>
<p>For example, given the following specification, numbers with the same hundreds digit would be part of the same triangle:</p>
<pre><code>101 301 501
102 302 502
103 303 503
201 401 601
202 402 602
203 403 603
</code></pre>
<p>In your puzzle input, and instead reading by columns, <em>how many</em> of the listed triangles are <em>possible</em>?</p>
</article>
<p>Your puzzle answer was <code>1849</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="/2016">return to your Advent calendar</a> and try another puzzle.</p>
<p>If you still want to see it, you can <a href="3/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+%22Squares+With+Three+Sides%22+%2D+Day+3+%2D+Advent+of+Code+2016&url=https%3A%2F%2Fadventofcode%2Ecom%2F2016%2Fday%2F3&related=ericwastl&hashtags=AdventOfCode" target="_blank">Twitter</a>
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></span>]</span> this puzzle.</p>
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