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+<header id="title-block-header">
+<h1 class="title">Advent of Code 2022</h1>
+</header>
+<p>Code to solve the <a href="http://adventofcode.com/2022/">Advent of Code</a> puzzles. This year, I’m using the puzzles to develop my skills in <a href="https://wiki.haskell.org/Haskell">Haskell</a>. I’m writing up a <a href="https://work.njae.me.uk/tag/advent-of-code/">commentary on these puzzles and my solutions</a> on my blog.</p>
+<p><a href="http://learnyouahaskell.com/chapters">Learn you a Haskell</a>, <a href="https://www.haskell.org/tutorial/index.html">Introduction to Haskell 98</a>, and <a href="https://hackage.haskell.org/">Hackage</a> are good resources.</p>
+<p>The <a href="https://cabal.readthedocs.io/en/latest/index.html">Cabal user guide</a> and <a href="http://howistart.org/posts/haskell/1/">How I Start: Haskell</a> are good sources of using the tools.</p>
+<h1 id="toolchain">Toolchain</h1>
+<p>Install Ghcup following <a href="https://www.haskell.org/ghcup/install/#installation">the instructions</a>, making sure to load the updated environment with</p>
+<div class="sourceCode" id="cb1"><pre class="sourceCode bash"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="bu">source</span> /home/neil/.ghcup/env</span></code></pre></div>
+<p>and then set the default GHC to use with <code>ghcup set ghc 9.0.1</code> .</p>
+<p>Install <a href="https://haskell-language-server.readthedocs.io/en/latest/configuration.html">Haskell Language Server</a> for Sublime Text</p>
+<h2 id="creating-the-repository-and-project">Creating the repository and project</h2>
+<p>Create the repository as normal: create the project in Gitolite, clone it, and insert the <code>.gitignore</code> and <code>README.md</code> files.</p>
+<p>There’s one package per day, with the code for each package in sub-directories of the root directory.</p>
+<p>Create the basic <code>cabal</code> project.</p>
+<pre><code>cabal init</code></pre>
+<p>Modify the <code>advent-of-code21.cabal</code> file as needed, such as updating the Cabal version and writing the <code>common</code> stanzas.</p>
+<h2 id="creating-subsequent-days">Creating subsequent days</h2>
+<p>Each day lives in a separate directory, with code in the <code>src</code> directory.</p>
+<p>Compile with</p>
+<pre><code>cabal build</code></pre>
+<p>or</p>
+<pre><code>cabal build advent01</code></pre>
+<p>Run with</p>
+<pre><code>cabal run advent01</code></pre>
+<p>If you want to pass in additional RTS parameters, do it like this:</p>
+<pre><code>cabal run advent01 -- +RTS -K0 -RTS</code></pre>
+<p>Run interactively with</p>
+<pre><code>cabal repl advent01</code></pre>
+<p>or</p>
+<pre><code>stack ghci advent01:exe:advent01</code></pre>
+<p>if the first form is ambiguous.</p>
+<h2 id="profiling">Profiling</h2>
+<p>To profile, use</p>
+<pre><code>cabal run advent01 --enable-profiling -- +RTS -N -p -s -hT</code></pre>
+<p>Or, you can simplify the RTS options by adding them to a new stanza in the cabal file:</p>
+<pre><code>executable advent01prof
+ import: common-extensions, build-directives
+ main-is: advent01/Main.hs
+ build-depends: text, containers, linear, array, pqueue, mtl, lens
+ ghc-options: -O2
+ -Wall
+ -threaded
+ -rtsopts "-with-rtsopts=-N -p -s -hT"</code></pre>
+<p>then running</p>
+<pre><code>cabal run advent01prof --enable-profiling</code></pre>
+<p>Generate the profile graph with</p>
+<pre><code>hp2ps -M advent01.hp</code></pre>
+<h1 id="packages">Packages</h1>
+<p>Packages I used a lot:</p>
+<ul>
+<li><a href="https://hackage.haskell.org/package/containers">Containers</a> (and some <a href="https://haskell-containers.readthedocs.io/en/latest/intro.html">better documentation</a>); <a href="https://hackage.haskell.org/package/unordered-containers">Unordered containers</a> is a mostly-equivalent alternative.</li>
+<li><a href="https://hackage.haskell.org/package/attoparsec">Attoparsec</a> (and <a href="https://hackage.haskell.org/package/megaparsec">Megaparsec</a>, and <a href="https://hackage.haskell.org/package/base-4.14.1.0/docs/Text-ParserCombinators-ReadP.html">ReadP</a> once).</li>
+</ul>
+<p>There are somewhat decent <a href="https://markkarpov.com/tutorial/megaparsec.html">tutorials on Megaparsec</a> and <a href="https://www.schoolofhaskell.com/school/starting-with-haskell/libraries-and-frameworks/text-manipulation/attoparsec">Attoparsec</a>.</p>
+<p>Packages I didn’t use much, but need to remember:</p>
+<ul>
+<li><a href="https://hackage.haskell.org/package/arithmoi">Arithmoi</a> for number theory</li>
+<li><a href="https://hackage.haskell.org/package/pointedlist-0.6.1">Pointed List</a> for zipper lists (sometimes circular)</li>
+<li><a href="https://hackage.haskell.org/package/vector">Vector</a> for array-like things</li>
+<li><a href="https://hackage.haskell.org/package/linear">Linear</a> for coordinate-vector like things</li>
+<li><a href="https://hackage.haskell.org/package/grid">Grid</a> for 2-d grids</li>
+<li><a href="https://hackage.haskell.org/package/graph-wrapper">Graph-wrapper</a> for graphs</li>
+<li><a href="https://hackage.haskell.org/package/lens">Lens</a> (and a <a href="https://github.com/ekmett/lens/wiki/Operators">summary of operators</a>). I didn’t use these much this year, but did a lot last year.</li>
+<li><a href="https://hackage.haskell.org/package/mtl-2.2.2/docs/Control-Monad-RWS-Lazy.html">RWS</a> (Reader-Writer-State monad stack); again, used a lot last year but not this year</li>
+<li><a href="https://hackage.haskell.org/package/monad-loops-0.4.3/docs/Control-Monad-Loops.html">Monad loops</a>, and <a href="https://conscientiousprogrammer.com/blog/2015/12/11/24-days-of-hackage-2015-day-11-monad-loops-avoiding-writing-recursive-functions-by-refactoring/">a description</a></li>
+<li><a href="https://github.com/jamesdbrock/replace-megaparsec">Replace-Megaparsec</a>, for using Mpc for all sorts of things traditionally done with regex substitutions.</li>
+</ul>
+<h1 id="readme">Readme</h1>
+<p>Build this readme file wth</p>
+<pre><code>pandoc -s README.md > README.html</code></pre>
+<p>(Using the <a href="https://github.com/markdowncss/modest">Modest style</a>.)</p>
+</body>
+</html>
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--- /dev/null
+<!DOCTYPE html>
+<html lang="en-us">
+<head>
+<meta charset="utf-8"/>
+<title>Day 1 - Advent of Code 2023</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
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+-->
+<body>
+<header><div><h1 class="title-global"><a href="/">Advent of Code</a></h1><nav><ul><li><a href="/2023/about">[About]</a></li><li><a href="/2023/events">[Events]</a></li><li><a href="https://teespring.com/stores/advent-of-code" target="_blank">[Shop]</a></li><li><a href="/2023/settings">[Settings]</a></li><li><a href="/2023/auth/logout">[Log Out]</a></li></ul></nav><div class="user">Neil Smith <a href="/2023/support" class="supporter-badge" title="Advent of Code Supporter">(AoC++)</a> <span class="star-count">2*</span></div></div><div><h1 class="title-event"> <span class="title-event-wrap">0xffff&</span><a href="/2023">2023</a><span class="title-event-wrap"></span></h1><nav><ul><li><a href="/2023">[Calendar]</a></li><li><a href="/2023/support">[AoC++]</a></li><li><a href="/2023/sponsors">[Sponsors]</a></li><li><a href="/2023/leaderboard">[Leaderboard]</a></li><li><a href="/2023/stats">[Stats]</a></li></ul></nav></div></header>
+
+<div id="sidebar">
+<div id="sponsor"><div class="quiet">Our <a href="/2023/sponsors">sponsors</a> help make Advent of Code possible:</div><div class="sponsor"><a href="https://pantherainvestment.com/" target="_blank" onclick="if(ga)ga('send','event','sponsor','sidebar',this.href);" rel="noopener">Panthera Investment</a> - We solve Financial Markets. Do you want to join?</div></div>
+</div><!--/sidebar-->
+
+<main>
+<article class="day-desc"><h2>--- Day 1: Trebuchet?! ---</h2><p>Something is wrong with global snow production, and you've been selected to take a look. The Elves have even given you a map; on it, they've used stars to mark the top fifty locations that are likely to be having problems.</p>
+<p>You've been doing this long enough to know that to restore snow operations, you need to check all <em class="star">fifty stars</em> by December 25th.</p>
+<p>Collect stars by solving puzzles. Two puzzles will be made available on each day in the Advent calendar; the second puzzle is unlocked when you complete the first. Each puzzle grants <em class="star">one star</em>. Good luck!</p>
+<p>You try to ask why they can't just use a <a href="/2015/day/1">weather machine</a> ("not powerful enough") and where they're even sending you ("the sky") and why your map looks mostly blank ("you sure ask a lot of questions") <span title="My hope is that this abomination of a run-on sentence somehow conveys the chaos of being hastily loaded into a trebuchet.">and</span> hang on did you just say the sky ("of course, where do you think snow comes from") when you realize that the Elves are already loading you into a <a href="https://en.wikipedia.org/wiki/Trebuchet" target="_blank">trebuchet</a> ("please hold still, we need to strap you in").</p>
+<p>As they're making the final adjustments, they discover that their calibration document (your puzzle input) has been <em>amended</em> by a very young Elf who was apparently just excited to show off her art skills. Consequently, the Elves are having trouble reading the values on the document.</p>
+<p>The newly-improved calibration document consists of lines of text; each line originally contained a specific <em>calibration value</em> that the Elves now need to recover. On each line, the calibration value can be found by combining the <em>first digit</em> and the <em>last digit</em> (in that order) to form a single <em>two-digit number</em>.</p>
+<p>For example:</p>
+<pre><code>1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet
+</code></pre>
+<p>In this example, the calibration values of these four lines are <code>12</code>, <code>38</code>, <code>15</code>, and <code>77</code>. Adding these together produces <code><em>142</em></code>.</p>
+<p>Consider your entire calibration document. <em>What is the sum of all of the calibration values?</em></p>
+</article>
+<p>Your puzzle answer was <code>54968</code>.</p><article class="day-desc"><h2 id="part2">--- Part Two ---</h2><p>Your calculation isn't quite right. It looks like some of the digits are actually <em>spelled out with letters</em>: <code>one</code>, <code>two</code>, <code>three</code>, <code>four</code>, <code>five</code>, <code>six</code>, <code>seven</code>, <code>eight</code>, and <code>nine</code> <em>also</em> count as valid "digits".</p>
+<p>Equipped with this new information, you now need to find the real first and last digit on each line. For example:</p>
+<pre><code>two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen
+</code></pre>
+<p>In this example, the calibration values are <code>29</code>, <code>83</code>, <code>13</code>, <code>24</code>, <code>42</code>, <code>14</code>, and <code>76</code>. Adding these together produces <code><em>281</em></code>.</p>
+<p><em>What is the sum of all of the calibration values?</em></p>
+</article>
+<p>Your puzzle answer was <code>54094</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="/2023">return to your Advent calendar</a> and try another puzzle.</p>
+<p>If you still want to see it, you can <a href="1/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+%22Trebuchet%3F%21%22+%2D+Day+1+%2D+Advent+of+Code+2023&url=https%3A%2F%2Fadventofcode%2Ecom%2F2023%2Fday%2F1&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=I%27ve+completed+%22Trebuchet%3F%21%22+%2D+Day+1+%2D+Advent+of+Code+2023+%23AdventOfCode+https%3A%2F%2Fadventofcode%2Ecom%2F2023%2Fday%2F1';try{localStorage.setItem('mastodon.server',ms);}finally{}}else{return false;}" target="_blank">Mastodon</a
+></span>]</span> this puzzle.</p>
+</main>
+
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projects / advent-of-code-23.git / commitdiff