-
Notifications
You must be signed in to change notification settings - Fork 0
/
year2017_day24_puzzle.html
148 lines (85 loc) · 5.89 KB
/
year2017_day24_puzzle.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
<!DOCTYPE html>
<html lang="en-us">
<head>
<meta charset="utf-8"/>
<title>Day 24 - Advent of Code 2017</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 @[email protected] on Mastodon and
@ericwastl on Twitter.
- Eric Wastl
-->
<body>
<div id="sidebar">
</div><!--/sidebar-->
<main>
<article class="day-desc"><h2>--- Day 24: Electromagnetic Moat ---</h2><p>The CPU itself is a large, black building surrounded by a bottomless pit. Enormous metal tubes extend outward from the side of the building at regular intervals and descend down into the void. There's no way to cross, but you need to get inside.</p>
<p>No way, of course, other than building a <em>bridge</em> out of the magnetic components strewn about nearby.</p>
<p>Each component has two <em>ports</em>, one on each end. The ports come in all different types, and only matching types can be connected. You take an inventory of the components by their port types (your puzzle input). Each port is identified by the number of <em>pins</em> it uses; more pins mean a stronger connection for your bridge. A <code>3/7</code> component, for example, has a type-<code>3</code> port on one side, and a type-<code>7</code> port on the other.</p>
<p>Your side of the pit is metallic; a perfect surface to connect a magnetic, <em>zero-pin port</em>. Because of this, the first port you use must be of type <code>0</code>. It doesn't matter what type of port you end with; your goal is just to make the bridge as strong as possible.</p>
<p>The <em>strength</em> of a bridge is the sum of the port types in each component. For example, if your bridge is made of components <code>0/3</code>, <code>3/7</code>, and <code>7/4</code>, your bridge has a strength of <code>0+3 + 3+7 + 7+4 = 24</code>.</p>
<p>For example, suppose you had the following components:</p>
<pre><code>0/2
2/2
2/3
3/4
3/5
0/1
10/1
9/10
</code></pre>
<p>With them, you could make the following valid bridges:</p>
<ul>
<li><code>0/1</code></li>
<li><code>0/1</code>--<code>10/1</code></li>
<li><code>0/1</code>--<code>10/1</code>--<code>9/10</code></li>
<li><code>0/2</code></li>
<li><code>0/2</code>--<code>2/3</code></li>
<li><code>0/2</code>--<code>2/3</code>--<code>3/4</code></li>
<li><code>0/2</code>--<code>2/3</code>--<code>3/5</code></li>
<li><code>0/2</code>--<code>2/2</code></li>
<li><code>0/2</code>--<code>2/2</code>--<code>2/3</code></li>
<li><code>0/2</code>--<code>2/2</code>--<code>2/3</code>--<code>3/4</code></li>
<li><code>0/2</code>--<code>2/2</code>--<code>2/3</code>--<code>3/5</code></li>
</ul>
<p>(Note how, as shown by <code>10/1</code>, order of ports within a component doesn't matter. However, you may only use each port on a component once.)</p>
<p>Of these bridges, the <em>strongest</em> one is <code>0/1</code>--<code>10/1</code>--<code>9/10</code>; it has a strength of <code>0+1 + 1+10 + 10+9 = <em>31</em></code>.</p>
<p><em>What is the strength of the strongest bridge you can make</em> with the components you have available?</p>
</article>
<p>To begin, <a href="24/input" target="_blank">get your puzzle input</a>.</p>
<form method="post" action="24/answer"><input type="hidden" name="level" value="1"/><p>Answer: <input type="text" name="answer" autocomplete="off"/> <input type="submit" value="[Submit]"/></p></form>
<p>You can also <span class="share">[Share<span class="share-content">on
<a href="https://twitter.com/intent/tweet?text=%22Electromagnetic+Moat%22+%2D+Day+24+%2D+Advent+of+Code+2017&url=https%3A%2F%2Fadventofcode%2Ecom%2F2017%2Fday%2F24&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=%22Electromagnetic+Moat%22+%2D+Day+24+%2D+Advent+of+Code+2017+%23AdventOfCode+https%3A%2F%2Fadventofcode%2Ecom%2F2017%2Fday%2F24';try{localStorage.setItem('mastodon.server',ms);}finally{}}else{return false;}" target="_blank">Mastodon</a
></span>]</span> this puzzle.</p>
</main>
<!-- ga -->
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-69522494-1', 'auto');
ga('set', 'anonymizeIp', true);
ga('send', 'pageview');
</script>
<!-- /ga -->
</body>
</html>