day03.html

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  15 Oh, hello!  Funny seeing you here.
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  17 I appreciate your enthusiasm, but you aren't going to find much down here.
  18 There certainly aren't clues to any of the puzzles.  The best surprises don't
  19 even appear in the source until you unlock them for real.
  20
  21 Please be careful with automated requests; I'm not Google, and I can only take
  22 so much traffic.  Please be considerate so that everyone gets to play.
  23
  24 If you're curious about how Advent of Code works, it's running on some custom
  25 Perl code. Other than a few integrations (auth, analytics, ads, social media),
  26 I built the whole thing myself, including the design, animations, prose, and
  27 all of the puzzles.
  28
  29 The puzzles probably took the longest; the easiest ones were around 45 minutes
  30 each, but the harder ones took 2-3 hours, and a few even longer than that. A
  31 lot of effort went into building this thing - I hope you're enjoying playing it
  32 as much as I enjoyed making it for you!
  33
  34 If you'd like to hang out, I'm @ericwastl on Twitter.
  35
  36 - Eric Wastl
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  89 <header><div><h1 class="title-global"><a href="/">Advent of Code</a></h1><nav><ul><li><a href="/2016/about">[About]</a></li><li><a href="/2016/support">[AoC++]</a></li><li><a href="/2016/events">[Events]</a></li><li><a href="/2016/settings">[Settings]</a></li><li><a href="/2016/auth/logout">[Log Out]</a></li></ul></nav><div class="user">Neil Smith <span class="supporter">(AoC++)</span> <span class="star-count">6*</span></div></div><div><h1 class="title-event">&nbsp;&nbsp;&nbsp;<span class="title-event-wrap">&lt;y&gt;</span><a href="/2016">2016</a><span class="title-event-wrap">&lt;/y&gt;</span></h1><nav><ul><li><a href="/2016">[Calendar]</a></li><li><a href="/2016/leaderboard">[Leaderboard]</a></li><li><a href="/2016/stats">[Stats]</a></li><li><a href="/2016/sponsors">[Sponsors]</a></li></ul></nav></div></header>
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 107 <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>
 108 <p>Or are they?</p>
 109 <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>
 110 <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>
 111 <p>In your puzzle input, <em>how many</em> of the listed triangles are <em>possible</em>?</p>
 112 </article>
 113 <p>Your puzzle answer was <code>917</code>.</p><article class="day-desc"><h2>--- 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>
 114 <p>For example, given the following specification, numbers with the same hundreds digit would be part of the same triangle:</p>
 115 <pre><code>101 301 501
 116 102 302 502
 117 103 303 503
 118 201 401 601
 119 202 402 602
 120 203 403 603
 121 </code></pre>
 122 <p>In your puzzle input, and instead reading by columns, <em>how many</em> of the listed triangles are <em>possible</em>?</p>
 123 </article>
 124 <p>Your puzzle answer was <code>1649</code>.</p><p class="day-success">Both parts of this puzzle are complete! They provide two gold stars: **</p>
 125 <p>At this point, you should <a href="/2016">return to your advent calendar</a> and try another puzzle.</p>
 126 <p>If you still want to see it, you can <a href="3/input" target="_blank">get your puzzle input</a>.</p>
 127 <p>You can also <span class="share">[Share<span class="share-content">on
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 131 ></span>]</span> this puzzle.</p>
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