advent-of-code-09.html

   1 <!DOCTYPE html>
   2 <html lang="en-us">
   3 <head>
   4 <meta charset="utf-8"/>
   5 <title>Day 9 - Advent of Code</title>
   6 <!--[if lt IE 9]><script src="/static/html5.js"></script><![endif]-->
   7 <link href='//fonts.googleapis.com/css?family=Source+Code+Pro:300&subset=latin,latin-ext' rel='stylesheet' type='text/css'>
   8 <link rel="stylesheet" type="text/css" href="/static/style.css?3"/>
   9 <link rel="shortcut icon" href="/favicon.ico?2"/>
  10 </head><!--
  11
  12
  13
  14
  15 Oh, hello!  Funny seeing you here.
  16
  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.  You do risk spoiling a few
  19 surprises for yourself, though.  Best to play the normal way and discover
  20 everything as it was intended, I think.  The best surprises don't even appear
  21 in the source until you unlock them for real.
  22
  23 Please be careful with automated requests; I'm not Google, and I can only take
  24 so much traffic.  Please be considerate so that everyone gets to play.
  25
  26 If you're curious about how Advent of Code works, it's running on some custom
  27 Perl code. Other than a few integrations (auth, analytics, ads, social media),
  28 I built the whole thing myself, including the design, animations, prose, and
  29 all of the puzzles.
  30
  31 The puzzles probably took the longest; the easiest ones were around 45 minutes
  32 each, but the harder ones took 2-3 hours, some even longer than that. A lot of
  33 effort went into building this thing - I hope you're enjoying playing it as
  34 much as I enjoyed making it for you!
  35
  36 If you'd like to hang out, I'm @ericwastl on Twitter.
  37
  38 - Eric Wastl
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89 -->
  90 <body>
  91 <header><h1><a href="/">Advent of Code</a></h1><div class="user">Neil Smith <span class="star-count">26*</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>
  92
  93 <div id="ad">
  94 <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
  95 <!-- Advent of Code Wide Skyscraper -->
  96 <ins class="adsbygoogle"
  97      style="display:inline-block;width:160px;height:600px"
  98      data-ad-client="ca-pub-9420604735624631"
  99      data-ad-slot="8014013294"></ins>
 100 <script>
 101 (adsbygoogle = window.adsbygoogle || []).push({});
 102 </script>
 103 </div><!--/ad-->
 104
 105 <main>
 106 <article class="day-desc"><h2>--- Day 9: All in a Single Night ---</h2><p>Every year, Santa manages to deliver all of his presents in a single night.</p>
 107 <p>This year, however, he has some <span title="Bonus points if you recognize all of the locations.">new locations</span> to visit; his elves have provided him the distances between every pair of locations.  He can start and end at any two (different) locations he wants, but he must visit each location exactly once.  What is the <em>shortest distance</em> he can travel to achieve this?</p>
 108 <p>For example, given the following distances:</p>
 109 <pre><code>London to Dublin = 464
 110 London to Belfast = 518
 111 Dublin to Belfast = 141
 112 </code></pre>
 113 <p>The possible routes are therefore:</p>
 114 <pre><code>Dublin -> London -> Belfast = 982
 115 London -> Dublin -> Belfast = 605
 116 London -> Belfast -> Dublin = 659
 117 Dublin -> Belfast -> London = 659
 118 Belfast -> Dublin -> London = 605
 119 Belfast -> London -> Dublin = 982
 120 </code></pre>
 121 <p>The shortest of these is <code>London -> Dublin -> Belfast = 605</code>, and so the answer is <code>605</code> in this example.</p>
 122 <p>What is the distance of the shortest route?</p>
 123 </article>
 124 <p>Your puzzle answer was <code>207</code>.</p><article class="day-desc"><h2>--- Part Two ---</h2><p>The next year, just to show off, Santa decides to take the route with the <em>longest distance</em> instead.</p>
 125 <p>He can still start and end at any two (different) locations he wants, and he still must visit each location exactly once.</p>
 126 <p>For example, given the distances above, the longest route would be <code>982</code> via (for example) <code>Dublin -> London -> Belfast</code>.</p>
 127 <p>What is the distance of the longest route?</p>
 128 </article>
 129 <p>Your puzzle answer was <code>804</code>.</p><p class="day-success">Both parts of this puzzle are complete! They provide two gold stars: **</p>
 130 <p>At this point, you should <a href="/">return to your advent calendar</a> and try another puzzle.</p>
 131 <p>If you still want to see it, you can <a href="/day/9/input" target="_blank">get your puzzle input</a>.</p>
 132 <p>You can also <span class="share">[Share<span class="share-content">on
 133   <a href="https://twitter.com/intent/tweet?text=I%27ve+completed+%22All+in+a+Single+Night%22+%2D+Day+9+%2D+Advent+of+Code&amp;url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F9&amp;related=ericwastl&amp;hashtags=AdventOfCode" target="_blank">Twitter</a>
 134   <a href="https://plus.google.com/share?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F9" target="_blank">Google+</a>
 135   <a href="http://www.reddit.com/submit?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F9&amp;title=I%27ve+completed+%22All+in+a+Single+Night%22+%2D+Day+9+%2D+Advent+of+Code" target="_blank">Reddit</a
 136 ></span>]</span>
 137  this puzzle.</p>
 138 </main>
 139
 140 <!-- ga -->
 141 <script>
 142 (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
 143 (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
 144 m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
 145 })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
 146 ga('create', 'UA-69522494-1', 'auto');
 147 ga('send', 'pageview');
 148 </script>
 149 <!-- /ga -->
 150 </body>
 151 </html>