From: Neil Smith <neil.git@njae.me.uk>
Date: Mon, 7 Dec 2020 18:42:55 +0000 (+0000)
Subject: Done day 2
X-Git-Url: https://git.njae.me.uk/?p=advent-of-code-20.git;a=commitdiff_plain;h=72c69da4bb83a1a18965411c7a52b3f9b3a18d2d

Done day 2
---

diff --git a/advent01/package.yaml b/advent01/package.yaml
index d681f43..26e2fc9 100644
--- a/advent01/package.yaml
+++ b/advent01/package.yaml
@@ -2,7 +2,7 @@
 # Cabal file when you run `stack build`. See the hpack website for help with
 # this file: <https://github.com/sol/hpack>.
 
-name: advent201
+name: advent01
 synopsis: Advent of Code
 version: '0.0.1'
 
diff --git a/advent02/package.yaml b/advent02/package.yaml
new file mode 100644
index 0000000..7864e38
--- /dev/null
+++ b/advent02/package.yaml
@@ -0,0 +1,60 @@
+# This YAML file describes your package. Stack will automatically generate a
+# Cabal file when you run `stack build`. See the hpack website for help with
+# this file: <https://github.com/sol/hpack>.
+
+name: advent02
+synopsis: Advent of Code
+version: '0.0.1'
+
+default-extensions:
+- AllowAmbiguousTypes
+- ApplicativeDo
+- BangPatterns
+- BlockArguments
+- DataKinds
+- DeriveFoldable
+- DeriveFunctor
+- DeriveGeneric
+- DeriveTraversable
+- EmptyCase
+- FlexibleContexts
+- FlexibleInstances
+- FunctionalDependencies
+- GADTs
+- GeneralizedNewtypeDeriving
+- ImplicitParams
+- KindSignatures
+- LambdaCase
+- MonadComprehensions
+- MonoLocalBinds
+- MultiParamTypeClasses
+- MultiWayIf
+- NamedFieldPuns
+- NegativeLiterals
+- NumDecimals
+# - OverloadedLists
+- OverloadedStrings
+- PartialTypeSignatures
+- PatternGuards
+- PatternSynonyms
+- PolyKinds
+- RankNTypes
+- RecordWildCards
+- ScopedTypeVariables
+- TemplateHaskell
+- TransformListComp
+- TupleSections
+- TypeApplications
+- TypeFamilies
+- TypeInType
+- TypeOperators
+- ViewPatterns
+
+executables:
+  advent02:
+    main: advent02.hs
+    source-dirs: src
+    dependencies:
+    - base >= 2 && < 6
+    - text
+    - megaparsec
\ No newline at end of file
diff --git a/advent02/src/advent02.hs b/advent02/src/advent02.hs
new file mode 100644
index 0000000..27886d0
--- /dev/null
+++ b/advent02/src/advent02.hs
@@ -0,0 +1,65 @@
+-- import Debug.Trace
+
+import Data.Text (Text)
+import qualified Data.Text.IO as TIO
+
+import Data.Void (Void)
+
+import Text.Megaparsec hiding (State)
+import Text.Megaparsec.Char
+import qualified Text.Megaparsec.Char.Lexer as L
+import qualified Control.Applicative as CA
+
+data Policy = Policy
+  { lower :: Int
+  , upper :: Int
+  , character :: Char
+  , password :: String    
+  } deriving (Show, Eq, Ord)
+
+main :: IO ()
+main = 
+  do  text <- TIO.readFile "data/advent02.txt"
+      let policies = successfulParse text
+      print $ part1 policies
+      print $ part2 policies
+      -- print $ head $ part2 nums
+
+part1 = length . filter inRange
+  where nCharsPresent p = length $ filter (== (character p)) (password p)
+        inRange p = (nCharsPresent p >= (lower p)) && (nCharsPresent p <= (upper p))
+
+part2 = length . filter matches
+
+matches p = ((pw!!l) == c) /= ((pw!!u) == c)
+  where pw = password p
+        c = character p
+        l = (lower p) - 1
+        u = (upper p) - 1
+
+
+-- 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
+integerP = lexeme L.decimal
+-- signedInteger = L.signed sc integer
+symb = L.symbol sc
+hyphenP = symb "-"
+colonP = symb ":"
+characterP = alphaNumChar <* sc
+passwordP = some alphaNumChar <* sc
+
+policiesP = many policyP
+policyP = Policy <$> integerP <* hyphenP <*> integerP <*> characterP <* colonP <*> passwordP
+-- policyP = (,,,) <$> integerP <* hyphenP <*> integerP <*> characterP <* colonP <*> passwordP
+
+-- successfulParse :: Text -> [Policy]
+successfulParse input = 
+  case parse policiesP "input" input of
+    Left  _err -> [] -- TIO.putStr $ T.pack $ parseErrorPretty err
+    Right policies -> policies
diff --git a/data/advent02.txt b/data/advent02.txt
new file mode 100644
index 0000000..bb32789
--- /dev/null
+++ b/data/advent02.txt
@@ -0,0 +1,1000 @@
+4-5 l: rllllj
+4-10 s: ssskssphrlpscsxrfsr
+14-18 p: ppppppppppppppppppp
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+4-12 n: csgndnqnsjjvxn
+13-16 r: rrrrrrzrrrrrqrrrrrr
+13-15 t: ttttttttttttttqtt
+1-8 q: qqqtqtql
+6-10 t: ttttttttzwtttttt
+4-10 v: vvvsvvvvvqvvvv
+3-5 w: wwwtl
+3-8 z: qgkszmzkp
+4-6 w: wwwvwgww
+13-15 v: nvvvvvvvvdzvvvr
+10-11 v: gvmwdpgpvvb
+4-11 g: gggjgggvmgggg
+1-6 z: fzzzzzzzzz
+6-9 r: dmrrhxrrbrr
+1-2 t: tmttv
+5-13 d: jxvctbwmkpbqd
+6-8 w: wbwlhwdw
+17-18 x: qdzkpnhbdxcxsfsxkx
+3-5 w: wwwww
+2-3 n: xnjnl
+2-9 f: ffffxffff
+5-6 g: sgggjzg
+7-10 h: zlvnhhrhlz
+10-11 h: hhhhhhrhhhhhh
+6-7 k: kpvtkkkk
+9-17 b: vbbwhjntdzhbbhmbbq
+6-8 h: hlhhhhrdjncphc
diff --git a/problems/day01.html b/problems/day01.html
new file mode 100644
index 0000000..35d0bc1
--- /dev/null
+++ b/problems/day01.html
@@ -0,0 +1,140 @@
+<!DOCTYPE html>
+<html lang="en-us">
+<head>
+<meta charset="utf-8"/>
+<title>Day 1 - Advent of Code 2020</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?25"/>
+<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 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 on Twitter.
+
+- Eric Wastl
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+-->
+<body>
+<header><div><h1 class="title-global"><a href="/">Advent of Code</a></h1><nav><ul><li><a href="/2020/about">[About]</a></li><li><a href="/2020/events">[Events]</a></li><li><a href="https://teespring.com/stores/advent-of-code" target="_blank">[Shop]</a></li><li><a href="/2020/settings">[Settings]</a></li><li><a href="/2020/auth/logout">[Log Out]</a></li></ul></nav><div class="user">Neil Smith <a href="/2020/support" class="supporter-badge" title="Advent of Code Supporter">(AoC++)</a> <span class="star-count">4*</span></div></div><div><h1 class="title-event">&nbsp;<span class="title-event-wrap">{&apos;year&apos;:</span><a href="/2020">2020</a><span class="title-event-wrap">}</span></h1><nav><ul><li><a href="/2020">[Calendar]</a></li><li><a href="/2020/support">[AoC++]</a></li><li><a href="/2020/sponsors">[Sponsors]</a></li><li><a href="/2020/leaderboard">[Leaderboard]</a></li><li><a href="/2020/stats">[Stats]</a></li></ul></nav></div></header>
+
+<div id="sidebar">
+<div id="sponsor"><div class="quiet">Our <a href="/2020/sponsors">sponsors</a> help make Advent of Code possible:</div><div class="sponsor"><a href="https://jobs.americanexpress.com/technology" target="_blank" onclick="if(ga)ga('send','event','sponsor','sidebar',this.href);" rel="noopener">American Express</a> - We architect, code and ship software that makes us an essential part of our customers’ digital lives. Work with the latest tech and back the engineering community through open source. Find your place in tech on #TeamAmex.</div></div>
+</div><!--/sidebar-->
+
+<main>
+<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>
+<article class="day-desc"><h2>--- Day 1: Report Repair ---</h2><p>After saving Christmas <a href="/events">five years in a row</a>, you've decided to take a vacation at a nice resort on a tropical island. <span title="WHAT COULD GO WRONG">Surely</span>, Christmas will go on without you.</p>
+<p>The tropical island has its own currency and is entirely cash-only.  The gold coins used there have a little picture of a starfish; the locals just call them <em class="star">stars</em>. None of the currency exchanges seem to have heard of them, but somehow, you'll need to find fifty of these coins by the time you arrive so you can pay the deposit on your room.</p>
+<p>To save your vacation, 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>Before you leave, the Elves in accounting just need you to fix your <em>expense report</em> (your puzzle input); apparently, something isn't quite adding up.</p>
+<p>Specifically, they need you to <em>find the two entries that sum to <code>2020</code></em> and then multiply those two numbers together.</p>
+<p>For example, suppose your expense report contained the following:</p>
+<pre><code>1721
+979
+366
+299
+675
+1456
+</code></pre>
+<p>In this list, the two entries that sum to <code>2020</code> are <code>1721</code> and <code>299</code>. Multiplying them together produces <code>1721 * 299 = 514579</code>, so the correct answer is <code><em>514579</em></code>.</p>
+<p>Of course, your expense report is much larger. <em>Find the two entries that sum to <code>2020</code>; what do you get if you multiply them together?</em></p>
+</article>
+<p>Your puzzle answer was <code>982464</code>.</p><article class="day-desc"><h2 id="part2">--- Part Two ---</h2><p>The Elves in accounting are thankful for your help; one of them even offers you a starfish coin they had left over from a past vacation. They offer you a second one if you can find <em>three</em> numbers in your expense report that meet the same criteria.</p>
+<p>Using the above example again, the three entries that sum to <code>2020</code> are <code>979</code>, <code>366</code>, and <code>675</code>. Multiplying them together produces the answer, <code><em>241861950</em></code>.</p>
+<p>In your expense report, <em>what is the product of the three entries that sum to <code>2020</code>?</em></p>
+</article>
+<p>Your puzzle answer was <code>162292410</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="/2020">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+%22Report+Repair%22+%2D+Day+1+%2D+Advent+of+Code+2020&amp;url=https%3A%2F%2Fadventofcode%2Ecom%2F2020%2Fday%2F1&amp;related=ericwastl&amp;hashtags=AdventOfCode" target="_blank">Twitter</a>
+  <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=I%27ve+completed+%22Report+Repair%22+%2D+Day+1+%2D+Advent+of+Code+2020+%23AdventOfCode+https%3A%2F%2Fadventofcode%2Ecom%2F2020%2Fday%2F1'}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>
\ No newline at end of file
diff --git a/problems/day02.html b/problems/day02.html
new file mode 100644
index 0000000..fe84e81
--- /dev/null
+++ b/problems/day02.html
@@ -0,0 +1,143 @@
+<!DOCTYPE html>
+<html lang="en-us">
+<head>
+<meta charset="utf-8"/>
+<title>Day 2 - Advent of Code 2020</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?25"/>
+<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 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 on Twitter.
+
+- Eric Wastl
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+-->
+<body>
+<header><div><h1 class="title-global"><a href="/">Advent of Code</a></h1><nav><ul><li><a href="/2020/about">[About]</a></li><li><a href="/2020/events">[Events]</a></li><li><a href="https://teespring.com/stores/advent-of-code" target="_blank">[Shop]</a></li><li><a href="/2020/settings">[Settings]</a></li><li><a href="/2020/auth/logout">[Log Out]</a></li></ul></nav><div class="user">Neil Smith <a href="/2020/support" class="supporter-badge" title="Advent of Code Supporter">(AoC++)</a> <span class="star-count">4*</span></div></div><div><h1 class="title-event">&nbsp;&nbsp;<span class="title-event-wrap">0.0.0.0:</span><a href="/2020">2020</a><span class="title-event-wrap"></span></h1><nav><ul><li><a href="/2020">[Calendar]</a></li><li><a href="/2020/support">[AoC++]</a></li><li><a href="/2020/sponsors">[Sponsors]</a></li><li><a href="/2020/leaderboard">[Leaderboard]</a></li><li><a href="/2020/stats">[Stats]</a></li></ul></nav></div></header>
+
+<div id="sidebar">
+<div id="sponsor"><div class="quiet">Our <a href="/2020/sponsors">sponsors</a> help make Advent of Code possible:</div><div class="sponsor"><a href="https://jobs.americanexpress.com/technology" target="_blank" onclick="if(ga)ga('send','event','sponsor','sidebar',this.href);" rel="noopener">American Express</a> - We architect, code and ship software that makes us an essential part of our customers’ digital lives. Work with the latest tech and back the engineering community through open source. Find your place in tech on #TeamAmex.</div></div>
+</div><!--/sidebar-->
+
+<main>
+<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>
+<article class="day-desc"><h2>--- Day 2: Password Philosophy ---</h2><p>Your flight departs in a few days from the coastal airport; the easiest way down to the coast from here is via <a href="https://en.wikipedia.org/wiki/Toboggan" target="_blank">toboggan</a>.</p>
+<p>The shopkeeper at the North Pole Toboggan Rental Shop is having a bad day. "Something's wrong with our computers; we can't log in!" You ask if you can take a look.</p>
+<p>Their password database seems to be a little corrupted: some of the passwords wouldn't have been allowed by the <span title="To ensure your safety, your password must be the following string...">Official Toboggan Corporate Policy</span> that was in effect when they were chosen.</p>
+<p>To try to debug the problem, they have created a list (your puzzle input) of <em>passwords</em> (according to the corrupted database) and <em>the corporate policy when that password was set</em>.</p>
+<p>For example, suppose you have the following list:</p>
+<pre><code>1-3 a: abcde
+1-3 b: cdefg
+2-9 c: ccccccccc
+</code></pre>
+<p>Each line gives the password policy and then the password. The password policy indicates the lowest and highest number of times a given letter must appear for the password to be valid. For example, <code>1-3 a</code> means that the password must contain <code>a</code> at least <code>1</code> time and at most <code>3</code> times.</p>
+<p>In the above example, <code><em>2</em></code> passwords are valid. The middle password, <code>cdefg</code>, is not; it contains no instances of <code>b</code>, but needs at least <code>1</code>. The first and third passwords are valid: they contain one <code>a</code> or nine <code>c</code>, both within the limits of their respective policies.</p>
+<p><em>How many passwords are valid</em> according to their policies?</p>
+</article>
+<p>Your puzzle answer was <code>434</code>.</p><article class="day-desc"><h2 id="part2">--- Part Two ---</h2><p>While it appears you validated the passwords correctly, they don't seem to be what the Official Toboggan Corporate Authentication System is expecting.</p>
+<p>The shopkeeper suddenly realizes that he just accidentally explained the password policy rules from his old job at the sled rental place down the street! The Official Toboggan Corporate Policy actually works a little differently.</p>
+<p>Each policy actually describes two <em>positions in the password</em>, where <code>1</code> means the first character, <code>2</code> means the second character, and so on. (Be careful; Toboggan Corporate Policies have no concept of "index zero"!) <em>Exactly one of these positions</em> must contain the given letter. Other occurrences of the letter are irrelevant for the purposes of policy enforcement.</p>
+<p>Given the same example list from above:</p>
+<ul>
+<li><code>1-3 a: <em>a</em>b<em>c</em>de</code> is <em>valid</em>: position <code>1</code> contains <code>a</code> and position <code>3</code> does not.</li>
+<li><code>1-3 b: <em>c</em>d<em>e</em>fg</code> is <em>invalid</em>: neither position <code>1</code> nor position <code>3</code> contains <code>b</code>.</li>
+<li><code>2-9 c: c<em>c</em>cccccc<em>c</em></code> is <em>invalid</em>: both position <code>2</code> and position <code>9</code> contain <code>c</code>.</li>
+</ul>
+<p><em>How many passwords are valid</em> according to the new interpretation of the policies?</em></p>
+</article>
+<p>Your puzzle answer was <code>509</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="/2020">return to your Advent calendar</a> and try another puzzle.</p>
+<p>If you still want to see it, you can <a href="2/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+%22Password+Philosophy%22+%2D+Day+2+%2D+Advent+of+Code+2020&amp;url=https%3A%2F%2Fadventofcode%2Ecom%2F2020%2Fday%2F2&amp;related=ericwastl&amp;hashtags=AdventOfCode" target="_blank">Twitter</a>
+  <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=I%27ve+completed+%22Password+Philosophy%22+%2D+Day+2+%2D+Advent+of+Code+2020+%23AdventOfCode+https%3A%2F%2Fadventofcode%2Ecom%2F2020%2Fday%2F2'}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>
\ No newline at end of file
diff --git a/stack.yaml b/stack.yaml
index a9a0f89..5733ed4 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -36,6 +36,7 @@ ghc-options:
 packages:
 # - .
 - advent01
+- advent02
 
 # Dependency packages to be pulled from upstream that are not in the resolver.
 # These entries can reference officially published versions as well as