Day 18
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Sebastian Seedorf
2071
day18/input.txt
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2071
day18/input.txt
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day18/part1.py
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day18/part1.py
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#!/usr/bin/env python3
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import numpy as np
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lines = (x.strip() for x in open("input.txt"))
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cnt = 0
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matches = 0
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cubes = set()
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for line in lines:
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x, y, z = map(int, line.split(","))
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matches += sum((x+nx*s, y+ny*s, z+nz*s) in cubes for s in (1, -1) for nx, ny, nz in ((1, 0, 0), (0, 1, 0), (0, 0, 1)))
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cnt += 1
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cubes.add((x, y, z))
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print(matches, cnt, len(cubes))
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print(len(cubes)*6-matches*2)
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day18/part2.py
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day18/part2.py
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#!/usr/bin/env python3
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lines = (x.strip() for x in open("input.txt"))
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queue = [(0, 0, 0)]
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cnt = 0
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visited = set()
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cubes = set()
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for line in lines:
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x, y, z = map(int, line.split(","))
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cubes.add((x, y, z))
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while queue:
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x, y, z = queue.pop(0)
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for xn, yn, zn in ((1, 0, 0), (0, 1, 0), (0, 0, 1), (-1, 0, 0), (0, -1, 0), (0, 0, -1)):
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neighbor = (x+xn, y+yn, z+zn)
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if neighbor in cubes:
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cnt += 1
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elif neighbor not in visited and -2 <= neighbor[0] < 22 and -2 <= neighbor[1] < 22 and -2 <= neighbor[2] < 22:
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queue.append(neighbor)
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visited.add(neighbor)
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print(cnt)
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day18/task.html
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day18/task.html
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<!DOCTYPE html>
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<html lang="en-us">
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<head>
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<meta charset="utf-8"/>
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<title>Day 18 - Advent of Code 2022</title>
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<!--[if lt IE 9]><script src="/static/html5.js"></script><![endif]-->
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<link href='//fonts.googleapis.com/css?family=Source+Code+Pro:300&subset=latin,latin-ext' rel='stylesheet' type='text/css'/>
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<link rel="stylesheet" type="text/css" href="/static/style.css?30"/>
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<link rel="stylesheet alternate" type="text/css" href="/static/highcontrast.css?0" title="High Contrast"/>
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<link rel="shortcut icon" href="/favicon.png"/>
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<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>
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</head><!--
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Oh, hello! Funny seeing you here.
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I appreciate your enthusiasm, but you aren't going to find much down here.
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There certainly aren't clues to any of the puzzles. The best surprises don't
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even appear in the source until you unlock them for real.
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Please be careful with automated requests; I'm not a massive company, and I can
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only take so much traffic. Please be considerate so that everyone gets to play.
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If you're curious about how Advent of Code works, it's running on some custom
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Perl code. Other than a few integrations (auth, analytics, social media), I
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built the whole thing myself, including the design, animations, prose, and all
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of the puzzles.
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The puzzles are most of the work; preparing a new calendar and a new set of
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puzzles each year takes all of my free time for 4-5 months. A lot of effort
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went into building this thing - I hope you're enjoying playing it as much as I
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enjoyed making it for you!
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If you'd like to hang out, I'm @ericwastl on Twitter.
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- Eric Wastl
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-->
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<body>
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<header><div><h1 class="title-global"><a href="/">Advent of Code</a></h1><nav><ul><li><a href="/2022/about">[About]</a></li><li><a href="/2022/events">[Events]</a></li><li><a href="https://teespring.com/stores/advent-of-code" target="_blank">[Shop]</a></li><li><a href="/2022/settings">[Settings]</a></li><li><a href="/2022/auth/logout">[Log Out]</a></li></ul></nav><div class="user">TheCaesar2011 <span class="star-count">32*</span></div></div><div><h1 class="title-event"> <span class="title-event-wrap">y(</span><a href="/2022">2022</a><span class="title-event-wrap">)</span></h1><nav><ul><li><a href="/2022">[Calendar]</a></li><li><a href="/2022/support">[AoC++]</a></li><li><a href="/2022/sponsors">[Sponsors]</a></li><li><a href="/2022/leaderboard">[Leaderboard]</a></li><li><a href="/2022/stats">[Stats]</a></li></ul></nav></div></header>
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<div id="sidebar">
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<div id="sponsor"><div class="quiet">Our <a href="/2022/sponsors">sponsors</a> help make Advent of Code possible:</div><div class="sponsor"><a href="https://www.twilio.com/quest" target="_blank" onclick="if(ga)ga('send','event','sponsor','sidebar',this.href);" rel="noopener">TwilioQuest</a> - Discover your power to change the world with code with TwilioQuest, an educational RPG. Learn foundational programming skills, JavaScript and Python while you explore The Cloud alongside our community of developers.</div></div>
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</div><!--/sidebar-->
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<main>
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<article class="day-desc"><h2>--- Day 18: Boiling Boulders ---</h2><p>You and the elephants finally reach fresh air. You've emerged near the base of a large volcano that seems to be actively erupting! Fortunately, the lava seems to be flowing away from you and toward the ocean.</p>
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<p>Bits of lava are still being ejected toward you, so you're sheltering in the cavern exit a little longer. Outside the cave, you can see the lava landing in a pond and hear it loudly hissing as it solidifies.</p>
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<p>Depending on the specific compounds in the lava and speed at which it cools, it might be forming <a href="https://en.wikipedia.org/wiki/Obsidian" target="_blank">obsidian</a>! The cooling rate should be based on the surface area of the lava droplets, so you take a quick scan of a droplet as it flies past you (your puzzle input).</p>
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<p>Because of how quickly the lava is moving, the scan isn't very good; its resolution is quite low and, as a result, it approximates the shape of the lava droplet with <em>1x1x1 <span title="Unfortunately, you forgot your flint and steel in another dimension.">cubes</span> on a 3D grid</em>, each given as its <code>x,y,z</code> position.</p>
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<p>To approximate the surface area, count the number of sides of each cube that are not immediately connected to another cube. So, if your scan were only two adjacent cubes like <code>1,1,1</code> and <code>2,1,1</code>, each cube would have a single side covered and five sides exposed, a total surface area of <code><em>10</em></code> sides.</p>
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<p>Here's a larger example:</p>
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<pre><code>2,2,2
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1,2,2
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3,2,2
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2,1,2
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2,3,2
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2,2,1
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2,2,3
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2,2,4
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2,2,6
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1,2,5
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3,2,5
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2,1,5
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2,3,5
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</code></pre>
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<p>In the above example, after counting up all the sides that aren't connected to another cube, the total surface area is <code><em>64</em></code>.</p>
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<p><em>What is the surface area of your scanned lava droplet?</em></p>
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</article>
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<p>To begin, <a href="18/input" target="_blank">get your puzzle input</a>.</p>
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<form method="post" action="18/answer"><input type="hidden" name="level" value="1"/><p>Answer: <input type="text" name="answer" autocomplete="off"/> <input type="submit" value="[Submit]"/></p></form>
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<p>You can also <span class="share">[Share<span class="share-content">on
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<a href="https://twitter.com/intent/tweet?text=%22Boiling+Boulders%22+%2D+Day+18+%2D+Advent+of+Code+2022&url=https%3A%2F%2Fadventofcode%2Ecom%2F2022%2Fday%2F18&related=ericwastl&hashtags=AdventOfCode" target="_blank">Twitter</a>
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<a href="javascript:void(0);" onclick="var mastodon_instance=prompt('Mastodon Instance / Server Name?'); if(typeof mastodon_instance==='string' && mastodon_instance.length){this.href='https://'+mastodon_instance+'/share?text=%22Boiling+Boulders%22+%2D+Day+18+%2D+Advent+of+Code+2022+%23AdventOfCode+https%3A%2F%2Fadventofcode%2Ecom%2F2022%2Fday%2F18'}else{return false;}" target="_blank">Mastodon</a
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></span>]</span> this puzzle.</p>
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</main>
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</body>
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</html>
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