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2 3 2 3 3 2 1 7 0 6 1 8 8 3 5 9 1 1 2 2 1 2 2 1 5 0 10 6 9 9 3 9 6 8 1 3 1 1 3 3 1 1 3 1 5 2 4 3 3 5 1 5 0 11 5 9 1 4 1 1 4 8 7 1 3 1 1 3 1 2 1 8 0 10 1 8 5 5 5 5 5 3 1 4 2 1 2 1 3 1 3 1 1 6 0 9 1 6 1 3 2 5 7 8 5 3 3 3 1 2 1 4 4 1 3 1 3 4 2 2 3 5 3 3 4 1 6 0 11 6 8 2 6 1 1 6 9 8 6 9 1 1 1 2 3 2 1 6 0 8 5 6 2 1 9 9 8 9 1 2 3 1 3 2 1 5 0 6 1 6 7 4 1 4 2 3 2 2 1 5 2 1 1 3 5 1 5 0 8 1 8 2 8 2 7 8 2 2 2 1 2 3 1 6 0 8 9 5 3 2 7 9 4 1 1 3 2 2 3 3 1 9 0 7 7 1 1 7 3 8 6 2 3 1 2 2 2 3 2 3 2 2 3 5 2 3 5 1 5 0 6 1 7 7 5 4 6 3 1 1 2 1 1 7 0 9 1 9 3 1 2 4 9 4 3 3 1 2 2 2 1 3 1 7 0 6 7 7 1 7 2 1 1 1 2 1 2 2 2 2 3 2 2 5 3 6 1 8 0 8 5 7 6 2 8 7 8 1 2 3 2 2 3 2 1 2 1 8 0 9 6 6 9 5 7 5 1 8 3 2 3 2 1 3 2 1 1 1 9 0 8 5 3 2 3 2 1 4 2 1 1 1 1 1 2 3 1 2 3 3 2 1 3 5 3 6 1 5 0 7 2 5 9 8 2 1 3 3 3 3 1 1 1 8 0 9 1 6 5 5 8 1 3 1 5 3 2 1 2 1 2 3 1 1 8 0 9 5 7 9 5 9 9 1 8 1 2 3 1 1 2 1 1 1 1 1 1 5 3 5 1 2 4 5 3 3 5 1 9 0 9 1 2 7 3 1 7 1 8 1 3 2 1 3 1 2 3 1 1 1 9 0 11 4 1 7 8 1 6 6 9 4 5 6 3 2 3 3 3 2 1 2 1 1 8 0 9 9 3 6 1 5 3 4 6 3 3 2 2 2 3 3 3 1 2 3 3 5 4 3 5 1 9 0 7 8 1 7 4 3 1 4 3 3 3 1 1 3 2 1 1 1 8 0 9 4 6 2 1 8 2 5 4 4 1 1 1 1 1 1 2 3 1 9 0 11 6 1 4 6 1 9 8 7 6 5 1 1 1 1 1 3 2 1 2 3 3 3 1 3 1 3 7 1 6 0 9 1 2 2 5 5 2 2 2 8 1 3 3 2 2 2 1 8 0 9 4 9 2 1 4 8 2 8 9 3 3 3 2 1 1 1 1 1 8 0 8 1 2 6 8 5 1 1 3 1 1 2 2 2 2 3 1 1 1 4 1 2 2 2 3 4 1 8 0 10 5 6 9 8 8 6 1 7 8 8 1 2 2 3 3 3 1 2 1 8 0 11 9 5 9 1 4 3 1 4 1 4 5 3 1 3 2 3 3 3 1 1 6 0 10 1 2 4 1 2 6 9 2 6 7 2 1 1 2 2 2 1 5 1 3 3 4 1 9 0 10 2 2 6 3 1 4 6 4 9 9 1 1 3 2 1 2 1 1 1 1 8 0 6 3 1 6 9 6 1 1 3 1 1 3 3 3 3 1 9 0 8 5 2 8 9 1 1 7 7 1 1 1 1 3 3 2 1 3 2 1 5 3 4 6 4 4 3 3 5 1 6 0 8 1 6 8 9 9 6 9 9 2 3 1 1 1 3 1 7 0 9 2 2 7 3 7 7 1 4 4 2 1 1 3 1 1 1 1 8 0 7 8 5 1 5 9 3 8 1 3 2 3 2 3 1 1 1 5 2 2 2 3 6 1 8 0 8 1 6 1 1 2 9 9 6 1 3 1 1 3 1 2 1 1 7 0 6 6 5 1 6 1 6 2 3 2 1 3 1 2 1 8 0 7 4 8 4 1 7 1 3 1 1 1 3 2 3 2 1 2 4 1 3 3 5 3 5 1 8 0 8 6 1 6 2 5 1 6 6 3 1 3 1 1 1 3 3 1 6 0 9 3 1 6 5 4 8 1 7 4 3 3 3 3 1 1 1 6 0 11 4 7 1 5 2 6 4 8 1 4 5 3 1 3 1 2 3 5 4 5 1 2 3 5 1 9 0 6 4 5 1 6 1 8 3 1 3 2 3 2 1 3 1 1 6 0 11 2 6 6 1 9 1 3 7 9 8 8 3 1 1 2 1 1 1 8 0 8 1 2 8 3 7 4 5 1 1 2 3 3 3 2 3 1 3 1 5 1 3 4 4 5 4 3 5 7 2 5 4 3 5 1 7 0 9 7 2 5 1 1 3 9 1 8 1 2 1 1 1 3 1 1 7 0 10 1 1 2 8 8 6 8 3 5 5 1 3 2 1 2 1 3 1 9 0 9 8 5 9 4 9 1 5 1 1 3 3 3 1 3 1 1 2 3 2 1 2 3 1 3 6 1 9 0 7 2 9 8 8 1 4 5 1 3 3 1 1 2 3 2 2 1 5 0 6 1 6 3 7 3 2 1 3 1 2 3 1 8 0 8 7 1 1 8 1 7 1 8 1 2 2 3 2 1 2 1 1 5 2 4 1 5 3 4 1 6 0 8 5 6 6 1 8 5 5 1 2 2 3 1 3 2 1 9 0 9 6 6 2 5 1 3 2 2 3 1 1 1 1 3 3 3 1 3 1 5 0 8 1 9 5 3 6 8 1 6 3 2 3 1 2 3 5 3 4 3 5 1 8 0 8 7 1 4 5 2 9 1 1 2 3 3 3 1 1 2 2 1 9 0 8 6 1 2 4 5 2 6 2 1 3 2 3 1 1 2 2 1 1 6 0 8 7 5 1 2 7 4 6 6 1 1 1 1 1 2 4 1 5 3 3 3 5 1 7 0 10 2 2 1 9 4 3 9 3 4 1 3 1 1 1 2 3 3 1 5 0 7 7 1 3 4 5 7 2 3 3 2 1 3 1 9 0 10 4 2 2 4 1 1 5 1 5 7 1 1 3 1 2 1 3 1 1 2 5 5 2 5 6 5 5 5 5 5 3 5 1 5 0 11 1 7 1 1 7 2 7 8 4 8 2 2 1 3 1 1 1 7 0 6 8 4 4 6 9 1 1 2 2 2 1 2 3 1 8 0 9 1 4 9 6 1 2 5 2 6 1 3 1 2 1 3 1 1 3 1 4 4 4 3 4 1 9 0 9 7 6 1 1 4 6 1 6 8 1 1 1 2 2 1 1 2 3 1 5 0 9 6 5 7 9 7 7 2 1 3 3 1 2 2 1 1 6 0 8 9 5 1 7 2 5 1 6 3 1 3 3 3 1 5 2 4 2 3 6 1 7 0 7 1 8 1 1 1 7 7 3 3 1 3 1 2 2 1 6 0 7 9 3 1 4 3 9 1 3 1 3 3 3 1 1 6 0 6 9 7 1 3 1 3 1 3 1 3 1 1 1 5 2 3 4 2 3 4 1 7 0 7 5 8 9 1 5 4 7 1 1 3 3 2 1 1 1 8 0 11 9 6 1 2 8 9 4 6 9 1 6 1 1 2 3 3 3 1 3 1 8 0 10 4 2 1 4 2 4 9 6 2 8 3 1 2 2 2 1 2 1 1 1 2 1 3 7 1 9 0 8 8 4 9 9 4 6 5 1 2 1 1 1 1 2 2 1 2 1 9 0 7 9 3 9 3 3 1 4 1 3 3 3 1 2 1 3 1 1 8 0 10 2 5 4 1 4 6 4 3 7 4 1 3 2 2 1 1 1 1 1 3 3 4 5 2 1 3 1 3 6 5 4 4 3 4 1 7 0 11 3 8 6 1 3 1 2 2 5 9 8 1 3 1 3 3 2 3 1 6 0 9 9 6 5 2 1 9 5 1 5 1 1 2 3 3 2 1 7 0 8 6 1 7 5 8 1 4 9 1 1 1 2 2 3 1 1 3 3 4 3 5 1 6 0 10 7 2 3 3 1 7 2 5 6 1 3 1 1 1 3 1 1 9 0 7 9 7 1 6 5 7 1 1 3 1 1 1 2 1 3 2 1 8 0 8 6 8 6 1 4 1 2 5 1 3 2 1 1 1 1 1 5 3 3 2 5 3 5 1 7 0 11 1 4 5 3 5 2 6 7 8 3 1 1 2 3 2 1 3 1 1 6 0 9 1 5 2 7 4 2 5 6 3 1 2 1 2 3 2 1 7 0 8 1 1 7 1 6 2 6 3 3 1 2 1 1 1 3 5 1 4 5 5 3 4 1 9 0 8 4 1 7 3 6 3 3 9 1 3 3 1 2 1 1 3 1 1 9 0 8 7 4 5 1 7 6 1 6 1 3 1 3 2 1 3 3 1 1 9 0 11 3 2 5 6 3 3 1 7 3 5 8 1 3 1 2 1 3 1 1 2 2 3 5 5 5 4 3 4 5 5 3 5 1 9 0 11 2 5 3 4 8 1 9 9 1 8 4 3 2 2 2 1 3 1 3 3 1 9 0 9 8 6 6 5 8 1 9 1 8 1 2 3 1 2 3 1 3 2 1 6 0 8 6 2 8 1 5 4 4 6 3 3 1 3 1 3 2 3 3 2 5 3 4 1 5 0 10 5 1 6 3 2 7 4 3 1 8 3 2 1 1 1 1 8 0 10 3 5 2 5 1 2 4 1 9 1 2 2 2 1 1 2 3 3 1 5 0 7 6 1 2 4 2 1 8 1 3 1 2 2 2 2 4 4 3 4 1 8 0 6 9 1 4 3 5 3 2 2 2 1 2 1 1 3 1 7 0 9 8 5 1 9 2 1 2 6 6 3 1 1 2 2 3 1 1 9 0 9 1 9 1 7 9 2 3 2 3 1 3 1 3 3 2 3 3 2 4 1 1 2 3 7 1 9 0 10 1 6 1 6 3 2 8 9 1 1 2 2 1 3 3 1 1 3 1 1 8 0 11 8 8 3 9 4 1 1 3 5 9 4 1 1 2 1 3 2 1 3 1 5 0 8 2 5 3 4 2 1 8 5 2 1 2 1 2 5 2 5 4 3 2 3 3 4 1 7 0 7 1 4 9 5 8 5 5 1 2 2 1 2 1 2 1 9 0 8 1 8 3 1 6 7 6 6 1 1 3 1 2 1 1 1 2 1 6 0 6 9 9 1 3 7 6 2 3 3 1 2 3 4 5 3 3 3 7 2 1 4 4 5 3 4 1 9 0 8 2 7 4 4 2 4 1 3 3 2 2 3 1 2 1 1 2 1 7 0 8 1 1 6 9 5 4 4 6 1 1 1 1 2 2 2 1 7 0 6 7 8 1 3 3 4 1 1 1 1 1 2 2 5 2 2 4 3 6 1 8 0 8 9 2 1 5 9 7 1 5 2 2 2 1 1 3 1 1 1 6 0 11 7 5 8 9 1 6 7 9 8 1 6 1 2 1 2 1 1 1 9 0 9 5 8 4 1 3 4 1 2 7 3 2 1 2 2 1 3 3 1 2 5 1 1 3 2 3 4 1 7 0 8 4 8 1 1 1 3 2 1 2 1 3 2 2 1 1 1 9 0 6 9 5 4 4 1 1 3 1 3 1 1 1 1 1 2 1 7 0 9 9 8 6 5 1 3 9 1 8 2 3 1 1 3 2 1 3 2 1 5 3 6 1 5 0 10 9 1 5 4 7 9 2 6 7 7 3 1 1 1 2 1 8 0 9 5 7 4 1 1 3 4 1 1 3 1 1 2 1 2 3 3 1 5 0 7 9 3 7 1 9 1 7 2 1 1 1 2 2 3 2 5 2 3 1 3 4 3 4 5 5 3 5 1 5 0 10 4 9 4 7 6 3 7 9 9 1 1 3 3 1 2 1 5 0 10 2 1 1 9 4 2 5 2 2 2 2 1 1 3 1 1 6 0 7 1 1 4 7 2 3 6 1 3 1 1 1 2 3 4 5 3 3 3 6 1 6 0 8 7 8 8 2 1 7 8 4 1 2 1 2 3 1 1 9 0 9 2 7 1 6 1 7 9 7 2 2 2 1 1 2 2 1 1 2 1 8 0 7 8 7 1 8 1 5 8 1 1 3 1 1 2 2 3 1 4 3 1 5 3 3 4 1 7 0 9 3 5 6 1 7 1 8 6 1 2 1 1 2 3 3 1 1 6 0 7 3 9 3 7 9 1 7 1 3 3 3 2 3 1 9 0 10 4 1 6 7 6 8 9 7 8 6 2 2 2 3 1 1 1 2 3 5 3 2 1 3 6 1 5 0 10 9 4 8 8 1 9 9 1 8 4 3 1 1 1 3 1 5 0 10 7 9 7 3 8 1 1 5 8 2 1 1 1 1 3 1 5 0 7 9 4 4 8 9 1 6 2 1 1 1 2 2 1 3 4 4 3 3 6 1 9 0 8 4 3 3 5 8 3 1 8 1 3 3 2 3 1 3 1 2 1 9 0 11 8 1 8 3 1 3 1 8 6 4 8 2 1 1 2 1 1 1 1 1 1 8 0 9 2 9 7 1 5 8 2 1 8 1 1 3 3 2 1 1 1 2 2 4 5 3 2 3 1 3 4 6 5 3 3 7 1 8 0 9 2 4 6 6 1 9 4 6 1 1 1 3 2 3 1 1 1 1 7 0 6 2 9 5 4 2 1 1 3 3 1 1 1 3 1 9 0 10 4 1 3 4 1 3 1 8 3 2 3 1 2 2 3 2 1 3 1 1 1 3 1 5 5 2 3 4 1 8 0 6 9 1 9 3 5 1 1 1 3 1 1 2 1 1 1 9 0 11 7 3 4 6 9 1 3 1 1 1 4 1 2 3 3 2 3 3 1 3 1 5 0 6 7 1 5 9 6 3 2 1 2 3 1 5 3 1 1 3 7 1 7 0 9 1 5 2 4 6 2 1 8 6 2 3 3 3 1 2 2 1 7 0 10 5 3 9 2 9 7 8 5 1 4 2 2 1 2 3 2 3 1 5 0 11 7 5 5 7 7 1 2 5 1 7 2 3 2 1 2 1 3 1 5 1 1 1 1 3 7 1 9 0 6 1 3 5 7 4 7 1 1 2 3 1 1 1 1 2 1 7 0 9 9 1 6 4 8 4 2 2 1 1 3 3 1 3 1 2 1 5 0 6 1 4 6 9 1 7 3 1 2 1 1 1 5 5 3 2 3 1 3 4 1 8 0 9 2 8 4 5 3 9 6 1 4 1 3 3 1 1 1 2 2 1 5 0 8 8 5 3 8 7 1 8 2 1 2 3 3 2 1 7 0 6 4 7 7 1 4 6 1 2 1 1 2 1 1 3 5 4 2 4 5 2 1 5 3 8 3 5 10 3 7 11 8 4 3
--- /dev/null
+<!DOCTYPE html>
+<html lang="en-us">
+<head>
+<meta charset="utf-8"/>
+<title>Day 7 - 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?17"/>
+<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
+
+
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+-->
+<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 <a href="/2018/support" class="supporter-badge" title="Advent of Code Supporter">(AoC++)</a> <span class="star-count">14*</span></div></div><div><h1 class="title-event"> <span class="title-event-wrap">sub y{</span><a href="/2018">2018</a><span class="title-event-wrap">}</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><div class="sponsor"><a href="https://coinid.org/?utm_source=aoc2018" target="_blank" onclick="if(ga)ga('send','event','sponsor','click',this.href);" rel="noopener">COINiD</a> - New open-source cryptocurrency wallet with cold storage support!</div></div>
+</div><!--/sidebar-->
+
+<main>
+<article class="day-desc"><h2>--- Day 7: The Sum of Its Parts ---</h2><p>You find yourself standing on a snow-covered coastline; apparently, you landed a little off course. The region is too hilly to see the North Pole from here, but you do spot some Elves that seem to be trying to unpack something that washed ashore. It's quite cold out, so you decide to risk creating a paradox by asking them for directions.</p>
+<p>"Oh, are you the search party?" Somehow, you can understand whatever Elves from the year 1018 speak; you assume it's <a href="/2015/day/6">Ancient Nordic Elvish</a>. Could the device on your wrist also be a translator? "Those clothes don't look very warm; take this." They hand you a heavy coat.</p>
+<p>"We do need to find our way back to the North Pole, but we have higher priorities at the moment. You see, believe it or not, this box contains something that will solve all of Santa's transportation problems - at least, that's what it looks like from the pictures in the instructions." It doesn't seem like they can read whatever language it's in, but you can: "Sleigh kit. <span title="Just some oak and some pine and a handful of Norsemen.">Some assembly required.</span>"</p>
+<p>"'Sleigh'? What a wonderful name! You must help us assemble this 'sleigh' at once!" They start excitedly pulling more parts out of the box.</p>
+<p>The instructions specify a series of <em>steps</em> and requirements about which steps must be finished before others can begin (your puzzle input). Each step is designated by a single letter. For example, suppose you have the following instructions:</p>
+<pre><code>Step C must be finished before step A can begin.
+Step C must be finished before step F can begin.
+Step A must be finished before step B can begin.
+Step A must be finished before step D can begin.
+Step B must be finished before step E can begin.
+Step D must be finished before step E can begin.
+Step F must be finished before step E can begin.
+</code></pre>
+<p>Visually, these requirements look like this:</p>
+<pre><code>
+ -->A--->B--
+ / \ \
+C -->D----->E
+ \ /
+ ---->F-----
+</code></pre>
+<p>Your first goal is to determine the order in which the steps should be completed. If more than one step is ready, choose the step which is first alphabetically. In this example, the steps would be completed as follows:</p>
+<ul>
+<li>Only <em><code>C</code></em> is available, and so it is done first.</li>
+<li>Next, both <code>A</code> and <code>F</code> are available. <em><code>A</code></em> is first alphabetically, so it is done next.</li>
+<li>Then, even though <code>F</code> was available earlier, steps <code>B</code> and <code>D</code> are now also available, and <em><code>B</code></em> is the first alphabetically of the three.</li>
+<li>After that, only <code>D</code> and <code>F</code> are available. <code>E</code> is not available because only some of its prerequisites are complete. Therefore, <em><code>D</code></em> is completed next.</li>
+<li><em><code>F</code></em> is the only choice, so it is done next.</li>
+<li>Finally, <em><code>E</code></em> is completed.</li>
+</ul>
+<p>So, in this example, the correct order is <em><code>CABDFE</code></em>.</p>
+<p><em>In what order should the steps in your instructions be completed?</em></p>
+</article>
+<p>Your puzzle answer was <code>FHICMRTXYDBOAJNPWQGVZUEKLS</code>.</p><article class="day-desc"><h2 id="part2">--- Part Two ---</h2><p>As you're about to begin construction, four of the Elves offer to help. "The sun will set soon; it'll go faster if we work together." Now, you need to account for multiple people working on steps simultaneously. If multiple steps are available, workers should still begin them in alphabetical order.</p>
+<p>Each step takes 60 seconds plus an amount corresponding to its letter: A=1, B=2, C=3, and so on. So, step A takes <code>60+1=61</code> seconds, while step Z takes <code>60+26=86</code> seconds. No time is required between steps.</p>
+<p>To simplify things for the example, however, suppose you only have help from one Elf (a total of two workers) and that each step takes 60 fewer seconds (so that step A takes 1 second and step Z takes 26 seconds). Then, using the same instructions as above, this is how each second would be spent:</p>
+<pre><code>Second Worker 1 Worker 2 Done
+ 0 C .
+ 1 C .
+ 2 C .
+ 3 A F C
+ 4 B F CA
+ 5 B F CA
+ 6 D F CAB
+ 7 D F CAB
+ 8 D F CAB
+ 9 D . CABF
+ 10 E . CABFD
+ 11 E . CABFD
+ 12 E . CABFD
+ 13 E . CABFD
+ 14 E . CABFD
+ 15 . . CABFDE
+</code></pre>
+<p>Each row represents one second of time. The Second column identifies how many seconds have passed as of the beginning of that second. Each worker column shows the step that worker is currently doing (or <code>.</code> if they are idle). The Done column shows completed steps.</p>
+<p>Note that the order of the steps has changed; this is because steps now take time to finish and multiple workers can begin multiple steps simultaneously.</p>
+<p>In this example, it would take <em>15</em> seconds for two workers to complete these steps.</p>
+<p>With <em>5</em> workers and the <em>60+ second</em> step durations described above, <em>how long will it take to complete all of the steps?</em></p>
+</article>
+<p>Your puzzle answer was <code>946</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="7/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+%22The+Sum+of+Its+Parts%22+%2D+Day+7+%2D+Advent+of+Code+2018&url=https%3A%2F%2Fadventofcode%2Ecom%2F2018%2Fday%2F7&related=ericwastl&hashtags=AdventOfCode" target="_blank">Twitter</a>
+ <a href="http://www.reddit.com/submit?url=https%3A%2F%2Fadventofcode%2Ecom%2F2018%2Fday%2F7&title=I%27ve+completed+%22The+Sum+of+Its+Parts%22+%2D+Day+7+%2D+Advent+of+Code+2018" target="_blank">Reddit</a
+></span>]</span> this puzzle.</p>
+</main>
+
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--- /dev/null
+<!DOCTYPE html>
+<html lang="en-us">
+<head>
+<meta charset="utf-8"/>
+<title>Day 8 - 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?18"/>
+<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
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+<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 <a href="/2018/support" class="supporter-badge" title="Advent of Code Supporter">(AoC++)</a> <span class="star-count">16*</span></div></div><div><h1 class="title-event"> <span class="title-event-wrap">var y=</span><a href="/2018">2018</a><span class="title-event-wrap">;</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><div class="sponsor"><a href="https://rainway.io/" target="_blank" onclick="if(ga)ga('send','event','sponsor','click',this.href);" rel="noopener">Rainway</a> - Play all your favorite PC games anytime, anywhere, across a variety of different devices.</div></div>
+</div><!--/sidebar-->
+
+<main>
+<article class="day-desc"><h2>--- Day 8: Memory Maneuver ---</h2><p>The sleigh is much easier to pull than you'd expect for something its weight. Unfortunately, neither you nor the Elves know <span title="It's North. Obviously.">which way</span> the North Pole is from here.</p>
+<p>You check your wrist device for anything that might help. It seems to have some kind of navigation system! Activating the navigation system produces more bad news: "Failed to start navigation system. Could not read software license file."</p>
+<p>The navigation system's license file consists of a list of numbers (your puzzle input). The numbers define a data structure which, when processed, produces some kind of <a href="https://en.wikipedia.org/wiki/Tree_(data_structure)">tree</a> that can be used to calculate the license number.</p>
+<p>The <em>tree</em> is made up of <em>nodes</em>; a single, outermost node forms the tree's <em>root</em>, and it contains all other nodes in the tree (or contains nodes that contain nodes, and so on).</p>
+<p>Specifically, a node consists of:</p>
+<ul>
+<li>A <em>header</em>, which is always exactly two numbers:
+<ul>
+<li>The quantity of child nodes.</li>
+<li>The quantity of metadata entries.</li>
+</ul>
+<li>Zero or more <em>child nodes</em> (as specified in the header).</li>
+<li>One or more <em>metadata entries</em> (as specified in the header).</li>
+</ul>
+<p>Each child node is itself a node that has its own header, child nodes, and metadata. For example:</p>
+<pre><code>2 3 0 3 10 11 12 1 1 0 1 99 2 1 1 2
+A----------------------------------
+ B----------- C-----------
+ D-----
+</code></pre>
+<p>In this example, each node of the tree is also marked with an underline starting with a letter for easier identification. In it, there are four nodes:</p>
+<ul>
+<li><code>A</code>, which has <code>2</code> child nodes (<code>B</code>, <code>C</code>) and <code>3</code> metadata entries (<code>1</code>, <code>1</code>, <code>2</code>).</li>
+<li><code>B</code>, which has <code>0</code> child nodes and <code>3</code> metadata entries (<code>10</code>, <code>11</code>, <code>12</code>).</li>
+<li><code>C</code>, which has <code>1</code> child node (<code>D</code>) and <code>1</code> metadata entry (<code>2</code>).</li>
+<li><code>D</code>, which has <code>0</code> child nodes and <code>1</code> metadata entry (<code>99</code>).</li>
+</ul>
+<p>The first check done on the license file is to simply add up all of the metadata entries. In this example, that sum is <code>1+1+2+10+11+12+2+99=<em>138</em></code>.</p>
+<p><em>What is the sum of all metadata entries?</em></p>
+</article>
+<p>Your puzzle answer was <code>46962</code>.</p><article class="day-desc"><h2 id="part2">--- Part Two ---</h2><p>The second check is slightly more complicated: you need to find the value of the root node (<code>A</code> in the example above).</p>
+<p>The <em>value of a node</em> depends on whether it has child nodes.</p>
+<p>If a node has <em>no child nodes</em>, its value is the sum of its metadata entries. So, the value of node <code>B</code> is <code>10+11+12=33</code>, and the value of node <code>D</code> is <code>99</code>.</p>
+<p>However, if a node <em>does have child nodes</em>, the metadata entries become indexes which refer to those child nodes. A metadata entry of <code>1</code> refers to the first child node, <code>2</code> to the second, <code>3</code> to the third, and so on. The value of this node is the sum of the values of the child nodes referenced by the metadata entries. If a referenced child node does not exist, that reference is skipped. A child node can be referenced multiple time and counts each time it is referenced. A metadata entry of <code>0</code> does not refer to any child node.</p>
+<p>For example, again using the above nodes:</p>
+<ul>
+<li>Node <code>C</code> has one metadata entry, <code>2</code>. Because node <code>C</code> has only one child node, <code>2</code> references a child node which does not exist, and so the value of node <code>C</code> is <code>0</code>.</li>
+<li>Node <code>A</code> has three metadata entries: <code>1</code>, <code>1</code>, and <code>2</code>. The <code>1</code> references node <code>A</code>'s first child node, <code>B</code>, and the <code>2</code> references node <code>A</code>'s second child node, <code>C</code>. Because node B has a value of <code>33</code> and node <code>C</code> has a value of <code>0</code>, the value of node <code>A</code> is <code>33+33+0=<em>66</em></code>.</li>
+</ul>
+<p>So, in this example, the value of the root node is <code>66</code>.</p>
+<p><em>What is the value of the root node?</em></p>
+</article>
+<p>Your puzzle answer was <code>22633</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="8/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+%22Memory+Maneuver%22+%2D+Day+8+%2D+Advent+of+Code+2018&url=https%3A%2F%2Fadventofcode%2Ecom%2F2018%2Fday%2F8&related=ericwastl&hashtags=AdventOfCode" target="_blank">Twitter</a>
+ <a href="http://www.reddit.com/submit?url=https%3A%2F%2Fadventofcode%2Ecom%2F2018%2Fday%2F8&title=I%27ve+completed+%22Memory+Maneuver%22+%2D+Day+8+%2D+Advent+of+Code+2018" target="_blank">Reddit</a
+></span>]</span> this puzzle.</p>
+</main>
+
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\ No newline at end of file
linkFileP = many linkP
-linkP = pairify <$> prefixP <*> upperChar <* infixP <*> upperChar <* suffixP
- where pairify _ a b = (a, b)
+-- linkP = pairify <$> prefixP <*> upperChar <* infixP <*> upperChar <* suffixP
+-- where pairify _ a b = (a, b)
+linkP = (,) <$> (prefixP *> upperChar <* infixP) <*> upperChar <* suffixP
successfulParse :: Text -> [Link]
successfulParse input =
--- /dev/null
+{-# LANGUAGE OverloadedStrings #-}
+
+-- import Data.List
+
+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
+
+
+data Tree = Node [Tree] [Int] deriving (Eq, Show)
+
+-- instance Foldable Tree where
+-- foldMap f (Node (t: ts) m) = f m <> foldMap (foldMap f) ts
+
+main :: IO ()
+main = do
+ text <- TIO.readFile "data/advent08.txt"
+ let treeSpec = successfulParse text
+ let (tree, _) = parseTree treeSpec
+ -- print $ foldMap sum tree
+ print $ part1 tree
+ print $ part2 tree
+
+part1 = sum . metadataOfTree
+
+part2 = valueOfTree
+
+
+parseTree (c:m:spec) = (Node children metadata, remainder')
+ where (children, remainder) = parseManyTree c spec
+ metadata = take m remainder
+ remainder' = drop m remainder
+
+parseManyTree n spec
+ | n == 0 = ([], spec)
+ | otherwise = ((tree:otherTrees), remainder')
+ where (tree, remainder) = parseTree spec
+ (otherTrees, remainder') = parseManyTree (n-1) remainder
+
+metadataOfTree (Node trees metadata) = metadata ++ (concatMap metadataOfTree trees)
+
+valueOfTree (Node trees metadata)
+ | null trees = sum metadata
+ | otherwise = sum selectedValues
+ where childValues = map valueOfTree trees
+ selectedValues = map (\v -> childValues!!(v-1)) $ filter (<= (length trees)) metadata
+
+
+-- 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
+
+treeFileP = many integer
+
+successfulParse :: Text -> [Int]
+successfulParse input =
+ case parse treeFileP "input" input of
+ Left _error -> [] -- TIO.putStr $ T.pack $ parseErrorPretty err
+ Right treeSpec -> treeSpec
\ No newline at end of file
projects / advent-of-code-18.git / commitdiff