From: Neil Smith <neil.git@njae.me.uk>
Date: Sat, 1 Dec 2018 13:20:43 +0000 (+0000)
Subject: Initial commit
X-Git-Url: https://git.njae.me.uk/?a=commitdiff_plain;h=3daf026f8f1a57fee82212aca0872eba0e71b8b4;p=advent-of-code-18.git
Initial commit
---
3daf026f8f1a57fee82212aca0872eba0e71b8b4
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..593051d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,42 @@
+# Extensionless files
+*
+!/**/
+!*.*
+
+# Haskell bits
+dist
+dist-*
+cabal-dev
+*.o
+*.hi
+*.chi
+*.chs.h
+*.dyn_o
+*.dyn_hi
+.hpc
+.hsenv
+.cabal-sandbox/
+cabal.sandbox.config
+*.prof
+*.aux
+*.hp
+*.eventlog
+.stack-work/
+cabal.project.local
+.HTF/
+
+# IPython / IHaskell notebook checkpoints
+.ipynb*
+
+# Sublime text
+*.sublime-workspace
+
+# Logs
+*.log
+
+# Profile exports
+*.ps
+
+# KDE
+.directory
+
diff --git a/README.html b/README.html
new file mode 100644
index 0000000..8dd29bb
--- /dev/null
+++ b/README.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+ <meta http-equiv="Content-Style-Type" content="text/css" />
+ <meta name="generator" content="pandoc" />
+ <title>Advent of Code 2018</title>
+ <style type="text/css">code{white-space: pre;}</style>
+ <link rel="stylesheet" href="modest.css" type="text/css" />
+</head>
+<body>
+<div id="header">
+<h1 class="title">Advent of Code 2018</h1>
+</div>
+<p>Code to solve the <a href="http://adventofcode.com/2018/">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>.</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://docs.haskellstack.org/en/stable/README/">Stack documentation</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>I'm using the basic Haskell Platform installation, togeher with <code>stack</code> to manage the packages and dependencies (install with</p>
+<pre><code>$ sudo aptitude install haskell-platform haskell-stack</code></pre>
+<p>).</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 just one package, with the code in sub-directories of the <code>src</code> directory. Each day will generate one (or more) entries in the <code>adventofcode17.cabal</code> file.</p>
+<p>Create the basic <code>stack</code> project. This will create a new directory. Note that this new directory name can't have a hyphen-delimited word that's just digits, so the project will have to be <code>advent-of-code</code></p>
+<pre><code>stack new advent-of-code --bare simple</code></pre>
+<p>Modify the <code>stack.yaml</code> file as needed, such as adding the <code>ghc-options</code> stanza.</p>
+<h2 id="creating-subsequent-days">Creating subsequent days</h2>
+<p>Each day lives in a separate directory within the <code>src</code> directory. It will also need it's own stanza in <code>advent-of-code.cabal</code>.</p>
+<p>Compile with</p>
+<pre><code>stack build</code></pre>
+<p>or</p>
+<pre><code>stack build advent01</code></pre>
+<p>Run with</p>
+<pre><code>stack exec advent01</code></pre>
+<p>Run interactively with</p>
+<pre><code>stack ghci advent-of-code:exe:advent01</code></pre>
+<p>To profile, use</p>
+<pre><code>stack build --executable-profiling --library-profiling --ghc-options="-fprof-auto -rtsopts" adventofcode1601</code></pre>
+<p>then run with</p>
+<pre><code>stack exec -- advent01 +RTS -p -hy</code></pre>
+<h1 id="packages">Packages</h1>
+<p>Stack is using the <a href="https://www.stackage.org/lts-12.20">12.20-lts resolver</a> for packages, so make sure you read the <a href="https://www.stackage.org/lts-12.20/docs">correct documentation for the packages included in it</a>.</p>
+<p>When you use a new package, use</p>
+<pre><code>stack solver</code></pre>
+<p>to see how the <code>stack.yaml</code> file needs to change, and</p>
+<pre><code>stack solver --update-yaml</code></pre>
+<p>to implement the changes.</p>
+<h1 id="ihaskell">IHaskell</h1>
+<p>Install following the <a href="https://github.com/gibiansky/IHaskell">IHaskell instructions</a>.</p>
+<p>Run it with</p>
+<pre><code>stack exec jupyter -- notebook</code></pre>
+<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>
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e268bd4
--- /dev/null
+++ b/README.md
@@ -0,0 +1,97 @@
+---
+title: "Advent of Code 2018"
+output: html_document
+css: modest.css
+---
+Code to solve the [Advent of Code](http://adventofcode.com/2018/) puzzles. This year, I'm using the puzzles to develop my skills in [Haskell](https://wiki.haskell.org/Haskell).
+
+[Learn you a Haskell](http://learnyouahaskell.com/chapters), [Introduction to Haskell 98](https://www.haskell.org/tutorial/index.html), and [Hackage](https://hackage.haskell.org/) are good resources.
+
+The [Stack documentation](https://docs.haskellstack.org/en/stable/README/) and [How I Start: Haskell](http://howistart.org/posts/haskell/1/) are good sources of using the tools.
+
+# Toolchain
+
+I'm using the basic Haskell Platform installation, togeher with `stack` to manage the packages and dependencies (install with
+```
+$ sudo aptitude install haskell-platform haskell-stack
+```
+).
+
+## Creating the repository and project
+Create the repository as normal: create the project in Gitolite, clone it, and insert the `.gitignore` and `README.md` files.
+
+There's just one package, with the code in sub-directories of the `src` directory. Each day will generate one (or more) entries in the `adventofcode17.cabal` file.
+
+Create the basic `stack` project. This will create a new directory. Note that this new directory name can't have a hyphen-delimited word that's just digits, so the project will have to be `advent-of-code`
+
+```
+stack new advent-of-code --bare simple
+```
+
+Modify the `stack.yaml` file as needed, such as adding the `ghc-options` stanza.
+
+## Creating subsequent days
+
+Each day lives in a separate directory within the `src` directory. It will also need it's own stanza in `advent-of-code.cabal`.
+
+Compile with
+```
+stack build
+```
+or
+```
+stack build advent01
+```
+
+Run with
+```
+stack exec advent01
+```
+
+Run interactively with
+```
+stack ghci advent-of-code:exe:advent01
+```
+
+To profile, use
+```
+stack build --executable-profiling --library-profiling --ghc-options="-fprof-auto -rtsopts" adventofcode1601
+```
+then run with
+```
+stack exec -- advent01 +RTS -p -hy
+```
+
+# Packages
+
+Stack is using the [12.20-lts resolver](https://www.stackage.org/lts-12.20) for packages, so make sure you read the [correct documentation for the packages included in it](https://www.stackage.org/lts-12.20/docs).
+
+When you use a new package, use
+
+```
+stack solver
+```
+to see how the `stack.yaml` file needs to change, and
+```
+stack solver --update-yaml
+```
+to implement the changes.
+
+# IHaskell
+
+Install following the [IHaskell instructions](https://github.com/gibiansky/IHaskell).
+
+Run it with
+
+```
+stack exec jupyter -- notebook
+```
+
+# Readme
+
+Build this readme file wth
+```
+pandoc -s README.md > README.html
+```
+
+(Using the [Modest style](https://github.com/markdowncss/modest).)
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
index 0000000..9a994af
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/advent-of-code-18.sublime-project b/advent-of-code-18.sublime-project
new file mode 100644
index 0000000..24db303
--- /dev/null
+++ b/advent-of-code-18.sublime-project
@@ -0,0 +1,8 @@
+{
+ "folders":
+ [
+ {
+ "path": "."
+ }
+ ]
+}
diff --git a/advent-of-code.cabal b/advent-of-code.cabal
new file mode 100644
index 0000000..e1d7dc8
--- /dev/null
+++ b/advent-of-code.cabal
@@ -0,0 +1,29 @@
+name: advent-of-code
+version: 0.1.0.0
+-- synopsis:
+-- description:
+homepage: https://github.com/neilnjae/advent-of-code#readme
+license: BSD3
+license-file: LICENSE
+author: Neil Smith
+maintainer: noone@njae.me.uk
+copyright: 2018 Neil Smith
+category: None
+build-type: Simple
+cabal-version: >=1.10
+extra-source-files: README.md
+
+executable advent-of-code
+ hs-source-dirs: src
+ main-is: Main.hs
+ default-language: Haskell2010
+ build-depends: base >= 4.7 && < 5
+
+executable advent01
+ hs-source-dirs: src/advent01
+ main-is: advent01.hs
+ default-language: Haskell2010
+ build-depends: base >= 4.7 && < 5
+ , text
+ , megaparsec
+ , containers
diff --git a/data/advent01.txt b/data/advent01.txt
new file mode 100644
index 0000000..f907f85
--- /dev/null
+++ b/data/advent01.txt
@@ -0,0 +1,1000 @@
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diff --git a/modest.css b/modest.css
new file mode 100644
index 0000000..947a9ea
--- /dev/null
+++ b/modest.css
@@ -0,0 +1,219 @@
+@media print {
+ *,
+ *:before,
+ *:after {
+ background: transparent !important;
+ color: #000 !important;
+ box-shadow: none !important;
+ text-shadow: none !important;
+ }
+
+ a,
+ a:visited {
+ text-decoration: underline;
+ }
+
+ a[href]:after {
+ content: " (" attr(href) ")";
+ }
+
+ abbr[title]:after {
+ content: " (" attr(title) ")";
+ }
+
+ a[href^="#"]:after,
+ a[href^="javascript:"]:after {
+ content: "";
+ }
+
+ pre,
+ blockquote {
+ border: 1px solid #999;
+ page-break-inside: avoid;
+ }
+
+ thead {
+ display: table-header-group;
+ }
+
+ tr,
+ img {
+ page-break-inside: avoid;
+ }
+
+ img {
+ max-width: 100% !important;
+ }
+
+ p,
+ h2,
+ h3 {
+ orphans: 3;
+ widows: 3;
+ }
+
+ h2,
+ h3 {
+ page-break-after: avoid;
+ }
+}
+
+pre,
+code {
+ font-family: Menlo, Monaco, "Courier New", monospace;
+}
+
+pre {
+ padding: .5rem;
+ line-height: 1.25;
+ overflow-x: scroll;
+}
+
+a,
+a:visited {
+ color: #3498db;
+}
+
+a:hover,
+a:focus,
+a:active {
+ color: #2980b9;
+}
+
+.modest-no-decoration {
+ text-decoration: none;
+}
+
+html {
+ font-size: 12px;
+}
+
+@media screen and (min-width: 32rem) and (max-width: 48rem) {
+ html {
+ font-size: 15px;
+ }
+}
+
+@media screen and (min-width: 48rem) {
+ html {
+ font-size: 16px;
+ }
+}
+
+body {
+ line-height: 1.85;
+}
+
+p,
+.modest-p {
+ font-size: 1rem;
+ margin-bottom: 1.3rem;
+}
+
+h1,
+.modest-h1,
+h2,
+.modest-h2,
+h3,
+.modest-h3,
+h4,
+.modest-h4 {
+ margin: 1.414rem 0 .5rem;
+ font-weight: inherit;
+ line-height: 1.42;
+}
+
+h1,
+.modest-h1 {
+ margin-top: 0;
+ font-size: 3.998rem;
+}
+
+h2,
+.modest-h2 {
+ font-size: 2.827rem;
+}
+
+h3,
+.modest-h3 {
+ font-size: 1.999rem;
+}
+
+h4,
+.modest-h4 {
+ font-size: 1.414rem;
+}
+
+h5,
+.modest-h5 {
+ font-size: 1.121rem;
+}
+
+h6,
+.modest-h6 {
+ font-size: .88rem;
+}
+
+small,
+.modest-small {
+ font-size: .707em;
+}
+
+/* https://github.com/mrmrs/fluidity */
+
+img,
+canvas,
+iframe,
+video,
+svg,
+select,
+textarea {
+ max-width: 100%;
+}
+
+@import url(http://fonts.googleapis.com/css?family=Open+Sans+Condensed:300,300italic,700);
+
+@import url(http://fonts.googleapis.com/css?family=Arimo:700,700italic);
+
+html {
+ font-size: 18px;
+ max-width: 100%;
+}
+
+body {
+ color: #444;
+ font-family: 'Open Sans Condensed', sans-serif;
+ font-weight: 300;
+ margin: 0 auto;
+ max-width: 48rem;
+ line-height: 1.45;
+ padding: .25rem;
+}
+
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+ font-family: Arimo, Helvetica, sans-serif;
+}
+
+h1,
+h2,
+h3 {
+ border-bottom: 2px solid #fafafa;
+ margin-bottom: 1.15rem;
+ padding-bottom: .5rem;
+ text-align: center;
+}
+
+blockquote {
+ border-left: 8px solid #fafafa;
+ padding: 1rem;
+}
+
+pre,
+code {
+ background-color: #fafafa;
+}
\ No newline at end of file
diff --git a/problems/day01.html b/problems/day01.html
new file mode 100644
index 0000000..8730f31
--- /dev/null
+++ b/problems/day01.html
@@ -0,0 +1,159 @@
+<!DOCTYPE html>
+<html lang="en-us">
+<head>
+<meta charset="utf-8"/>
+<title>Day 1 - Advent of Code 2018</title>
+<!--[if lt IE 9]><script src="/static/html5.js"></script><![endif]-->
+<link href='//fonts.googleapis.com/css?family=Source+Code+Pro:300&subset=latin,latin-ext' rel='stylesheet' type='text/css'>
+<link rel="stylesheet" type="text/css" href="/static/style.css?16"/>
+<link rel="stylesheet alternate" type="text/css" href="/static/highcontrast.css?0" title="High Contrast"/>
+<link rel="shortcut icon" href="/favicon.png"/>
+</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 Google, 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, ads, 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; the easiest ones take 3-4 hours each, but the
+harder ones take 6-8 hours, and a few even longer than that. 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 on Twitter.
+
+- Eric Wastl
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+-->
+<body>
+<header><div><h1 class="title-global"><a href="/">Advent of Code</a></h1><nav><ul><li><a href="/2018/about">[About]</a></li><li><a href="/2018/events">[Events]</a></li><li><a href="https://teespring.com/adventofcode" target="_blank">[Shop]</a></li><li><a href="/2018/settings">[Settings]</a></li><li><a href="/2018/auth/logout">[Log Out]</a></li></ul></nav><div class="user">Neil Smith <span class="star-count">2*</span></div></div><div><h1 class="title-event"> <span class="title-event-wrap"><y></span><a href="/2018">2018</a><span class="title-event-wrap"></y></span></h1><nav><ul><li><a href="/2018">[Calendar]</a></li><li><a href="/2018/support">[AoC++]</a></li><li><a href="/2018/sponsors">[Sponsors]</a></li><li><a href="/2018/leaderboard">[Leaderboard]</a></li><li><a href="/2018/stats">[Stats]</a></li></ul></nav></div></header>
+
+<div id="sidebar">
+<div id="sponsor"><div class="quiet">Our <a href="/2018/sponsors">sponsors</a> help make Advent of Code possible:</div><p><a href="https://www.wearedevelopers.com/world-congress/" target="_blank" onclick="if(ga)ga('send','event','sponsor','click',this.href);" rel="noopener">WeAreDevelopers</a> - Use "AOC-25", save EUR 25 and join 10^4 devs on June 6-7 at the WeAreDevelopers World Congress in Berlin ticket.get(now)</p></div>
+</div><!--/sidebar-->
+
+<main>
+<article class="day-desc"><h2>--- Day 1: Chronal Calibration ---</h2><p>"We've detected some temporal anomalies," one of Santa's Elves at the <span title="It's about as big on the inside as you expected.">Temporal Anomaly Research and Detection Instrument Station</span> tells you. She sounded pretty worried when she called you down here. "At 500-year intervals into the past, someone has been changing Santa's history!"</p>
+<p>"The good news is that the changes won't propagate to our time stream for another 25 days, and we have a device" - she attaches something to your wrist - "that will let you fix the changes with no such propagation delay. It's configured to send you 500 years further into the past every few days; that was the best we could do on such short notice."</p>
+<p>"The bad news is that we are detecting roughly <em>fifty</em> anomalies throughout time; the device will indicate fixed anomalies with <em class="star">stars</em>. The other bad news is that we only have one device and you're the best person for the job! Good lu--" She taps a button on the device and you suddenly feel like you're falling. To save Christmas, you need to get 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>After feeling like you've been falling for a few minutes, you look at the device's tiny screen. "Error: Device must be calibrated before first use. Frequency drift detected. Cannot maintain destination lock." Below the message, the device shows a sequence of changes in frequency (your puzzle input). A value like <code>+6</code> means the current frequency increases by <code>6</code>; a value like <code>-3</code> means the current frequency decreases by <code>3</code>.</p>
+<p>For example, if the device displays frequency changes of <code>+1, -2, +3, +1</code>, then starting from a frequency of zero, the following changes would occur:</p>
+<ul>
+<li>Current frequency <code> 0</code>, change of <code>+1</code>; resulting frequency <code> 1</code>.</li>
+<li>Current frequency <code> 1</code>, change of <code>-2</code>; resulting frequency <code>-1</code>.</li>
+<li>Current frequency <code>-1</code>, change of <code>+3</code>; resulting frequency <code> 2</code>.</li>
+<li>Current frequency <code> 2</code>, change of <code>+1</code>; resulting frequency <code> 3</code>.</li>
+</ul>
+<p>In this example, the resulting frequency is <code>3</code>.</p>
+<p>Here are other example situations:</p>
+<ul>
+<li><code>+1, +1, +1</code> results in <code> 3</code></li>
+<li><code>+1, +1, -2</code> results in <code> 0</code></li>
+<li><code>-1, -2, -3</code> results in <code>-6</code></li>
+</ul>
+<p>Starting with a frequency of zero, <em>what is the resulting frequency</em> after all of the changes in frequency have been applied?</p>
+</article>
+<p>Your puzzle answer was <code>472</code>.</p><article class="day-desc"><h2 id="part2">--- Part Two ---</h2><p>You notice that the device repeats the same frequency change list over and over. To calibrate the device, you need to find the first frequency it reaches <em>twice</em>.</p>
+<p>For example, using the same list of changes above, the device would loop as follows:</p>
+<ul>
+<li>Current frequency <code> 0</code>, change of <code>+1</code>; resulting frequency <code> 1</code>.</li>
+<li>Current frequency <code> 1</code>, change of <code>-2</code>; resulting frequency <code>-1</code>.</li>
+<li>Current frequency <code>-1</code>, change of <code>+3</code>; resulting frequency <code> 2</code>.</li>
+<li>Current frequency <code> 2</code>, change of <code>+1</code>; resulting frequency <code> 3</code>.</li>
+<li>(At this point, the device continues from the start of the list.)</li>
+<li>Current frequency <code> 3</code>, change of <code>+1</code>; resulting frequency <code> 4</code>.</li>
+<li>Current frequency <code> 4</code>, change of <code>-2</code>; resulting frequency <code> 2</code>, which has already been seen.</li>
+</ul>
+<p>In this example, the first frequency reached twice is <code>2</code>. Note that your device might need to repeat its list of frequency changes many times before a duplicate frequency is found, and that duplicates might be found while in the middle of processing the list.</p>
+<p>Here are other examples:</p>
+<ul>
+<li><code>+1, -1</code> first reaches <code>0</code> twice.</li>
+<li><code>+3, +3, +4, -2, -4</code> first reaches <code>10</code> twice.</li>
+<li><code>-6, +3, +8, +5, -6</code> first reaches <code>5</code> twice.</li>
+<li><code>+7, +7, -2, -7, -4</code> first reaches <code>14</code> twice.</li>
+</ul>
+<p><em>What is the first frequency your device reaches twice?</em></p>
+</article>
+<p>Your puzzle answer was <code>66932</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="/2018">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+%22Chronal+Calibration%22+%2D+Day+1+%2D+Advent+of+Code+2018&url=https%3A%2F%2Fadventofcode%2Ecom%2F2018%2Fday%2F1&related=ericwastl&hashtags=AdventOfCode" target="_blank">Twitter</a>
+ <a href="http://www.reddit.com/submit?url=https%3A%2F%2Fadventofcode%2Ecom%2F2018%2Fday%2F1&title=I%27ve+completed+%22Chronal+Calibration%22+%2D+Day+1+%2D+Advent+of+Code+2018" target="_blank">Reddit</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('send', 'pageview');
+</script>
+<!-- /ga -->
+</body>
+</html>
\ No newline at end of file
diff --git a/src/Main.hs b/src/Main.hs
new file mode 100644
index 0000000..9cd992d
--- /dev/null
+++ b/src/Main.hs
@@ -0,0 +1,5 @@
+module Main where
+
+main :: IO ()
+main = do
+ putStrLn "hello world"
diff --git a/src/advent01/advent01.hs b/src/advent01/advent01.hs
new file mode 100644
index 0000000..3b7a71c
--- /dev/null
+++ b/src/advent01/advent01.hs
@@ -0,0 +1,61 @@
+{-# LANGUAGE NegativeLiterals #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+import Data.Text (Text)
+import qualified Data.Text.IO as TIO
+
+import Data.Void (Void)
+
+import Text.Megaparsec
+import Text.Megaparsec.Char
+import qualified Text.Megaparsec.Char.Lexer as L
+import qualified Control.Applicative as CA
+
+import Data.IntSet (IntSet)
+import qualified Data.IntSet as IntSet
+
+main :: IO ()
+main = do
+ text <- TIO.readFile "data/advent01.txt"
+ let changes = successfulParse text
+ print $ part1 changes
+ print $ part2 changes
+
+
+part1 :: [Int] -> Int
+part1 = sum
+
+part2 :: [Int] -> Int
+part2 changes = snd $ head $ dropWhile unRepeated $ scanl merge (IntSet.empty, 0) $ cycle changes
+
+
+merge :: (IntSet, Int) -> Int -> (IntSet, Int)
+merge (s, f) c = (IntSet.insert f s, f+c)
+
+unRepeated :: (IntSet, Int) -> Bool
+unRepeated (s, f) = f `IntSet.notMember` s
+
+-- Parse the input file
+type Parser = Parsec Void Text
+
+sc :: Parser ()
+-- sc = L.space (skipSome spaceChar) CA.empty CA.empty
+sc = L.space (skipSome (char ' ')) CA.empty CA.empty
+
+
+lexeme = L.lexeme sc
+integer = lexeme L.decimal
+signedInteger = L.signed sc integer
+
+-- symb = L.symbol sc
+-- comma = symb ","
+
+
+changesP = signedInteger `sepEndBy` newline
+
+
+successfulParse :: Text -> [Int]
+successfulParse input =
+ case parse changesP "input" input of
+ Left _err -> [] -- TIO.putStr $ T.pack $ parseErrorPretty err
+ Right changes -> changes
\ No newline at end of file
diff --git a/stack.yaml b/stack.yaml
new file mode 100644
index 0000000..889be00
--- /dev/null
+++ b/stack.yaml
@@ -0,0 +1,68 @@
+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# https://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+# resolver: ghcjs-0.1.0_ghc-7.10.2
+#
+# The location of a snapshot can be provided as a file or url. Stack assumes
+# a snapshot provided as a file might change, whereas a url resource does not.
+#
+# resolver: ./custom-snapshot.yaml
+# resolver: https://example.com/snapshots/2018-01-01.yaml
+resolver: lts-12.20
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+# - location:
+# git: https://github.com/commercialhaskell/stack.git
+# commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# subdirs:
+# - auto-update
+# - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver
+# using the same syntax as the packages field.
+# (e.g., acme-missiles-0.3)
+# extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+# flags: {}
+
+# Extra package databases containing global packages
+# extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=1.7"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor
+
+ghc-options:
+ $locals: -O2 -Wall -Wno-missing-signatures -threaded -rtsopts -with-rtsopts=-N
\ No newline at end of file