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day01.html
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<!DOCTYPE html>
<html lang="en-us">
<head>
<title>2020/day01.nim</title>
<link rel="icon" href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2280%22>🐳</text></svg>">
<meta content="text/html; charset=utf-8" http-equiv="content-type">
<meta content="width=device-width, initial-scale=1" name="viewport">
<link rel='stylesheet' href='https://unpkg.com/normalize.css/'>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/kognise/water.css@latest/dist/dark.min.css">
<link rel='stylesheet' href='https://cdn.jsdelivr.net/gh/pietroppeter/nimib/assets/androidstudio.css'>
<style>
.nb-box {
display: flex;
align-items: center;
justify-content: space-between;
}
.nb-small {
font-size: 0.8rem;
}
button.nb-small {
float: right;
padding: 2px;
padding-right: 5px;
padding-left: 5px;
}
section#source {
display:none
}
</style>
<script async defer data-domain="pietroppeter.github.io/adventofnim" src="https://plausible.io/js/plausible.js"></script>
<style>
a {
text-decoration: none;
color: #009900;
}
a:hover {
color: #99ff99;
}
em {
color: #ffffff;
font-style: normal;
text-shadow: 0 0 5px #ffffff;
}
em.star {
font-style: normal;
color: #ffff66;
text-shadow: 0 0 5px #ffff66;
}
</style>
</head>
<body>
<header>
<div class="nb-box">
<span><a href="..">🏡</a></span>
<span><code>2020/day01.nim</code></span>
<span><a href="https://github.com/pietroppeter/adventofnim"><svg aria-hidden="true" width="1.2em" height="1.2em" style="vertical-align: middle; fill: #fff" preserveAspectRatio="xMidYMid meet" viewBox="0 0 16 16"><path fill-rule="evenodd" d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.013 8.013 0 0016 8c0-4.42-3.58-8-8-8z"></path></svg></a></span>
</div>
<hr>
</header><main>
<h1>--- Day 1: Report Repair ---</h1>
<h2>input</h2>
<pre><code class="nim hljs"><span class="hljs-keyword">let</span> input: <span class="hljs-built_in">seq</span>[<span class="hljs-built_in">int</span>] = toSeq(<span class="hljs-string">"2020/input01.txt"</span>.lines).map(parseInt)
<span class="hljs-keyword">echo</span> input.len
<span class="hljs-keyword">echo</span> input[<span class="hljs-number">0</span> .. <span class="hljs-number">10</span>]
<span class="hljs-keyword">echo</span> input[^<span class="hljs-number">10</span> .. ^<span class="hljs-number">1</span>]</code></pre>
<pre><samp>200
@[1583, 1295, 1747, 1628, 1756, 1992, 1984, 1990, 2006, 1626, 1292]
@[1743, 1909, 1451, 2000, 1978, 1938, 1707, 1337, 1362, 1263]
</samp></pre>
<h2>-- Part 1 --</h2>
<p>solution to parse 1 does not necessarily even needs to parse the whole input.
this solution is correct also for the edge case 2010 + 2010</p>
<pre><code class="nim hljs"><span class="hljs-keyword">var</span> s, t: <span class="hljs-built_in">seq</span>[<span class="hljs-built_in">int</span>]
<span class="hljs-keyword">for</span> n <span class="hljs-keyword">in</span> input:
<span class="hljs-keyword">if</span> n < <span class="hljs-number">1010</span>:
t.add n
<span class="hljs-keyword">if</span> <span class="hljs-number">2020</span> - n <span class="hljs-keyword">in</span> s:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part 1: "</span>, n * (<span class="hljs-number">2020</span> - n)
s.add n</code></pre>
<pre><samp>part 1: 538464
</samp></pre>
<p>That's the right answer! You are <em class="star">one gold star</em> closer to saving your vacation.</p>
<h2>-- Part 2 --</h2>
<pre><code class="nim hljs">s.sort()
t.sort()
<span class="hljs-keyword">block</span> outer:
<span class="hljs-keyword">for</span> i, n <span class="hljs-keyword">in</span> s:
<span class="hljs-keyword">for</span> m <span class="hljs-keyword">in</span> s[(i + <span class="hljs-number">1</span>) .. ^<span class="hljs-number">1</span>]:
<span class="hljs-keyword">for</span> k <span class="hljs-keyword">in</span> t:
<span class="hljs-keyword">if</span> n + m + k == <span class="hljs-number">2020</span>:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part 2: "</span>, n * m * k
<span class="hljs-keyword">break</span> outer
<span class="hljs-keyword">if</span> n + m + k > <span class="hljs-number">2020</span>:
<span class="hljs-keyword">break</span></code></pre>
<pre><samp>part 2: 278783190
</samp></pre>
<p>That's the right answer! You are <em class="star">one gold star</em> closer to saving your vacation.</p>
</main>
<footer>
<hr>
<div class="nb-box">
<span><span class="nb-small">made with <a href="https://pietroppeter.github.io/nimib/">nimib 🐳</a></span></span>
<span></span>
<span><button class="nb-small" id="show" onclick="toggleSourceDisplay()">Show Source</button></span>
</div>
</footer>
<section id="source">
<pre><code class="nim hljs"><span class="hljs-keyword">import</span> nimib, animu
nbInit
nbDoc.darkMode <span class="hljs-comment"># only to have github logo in dark mode (the rest is in custom head)</span>
nbText : <span class="hljs-string">"# --- Day 1: Report Repair ---"</span>
nbText: <span class="hljs-string">"## input"</span>
nbCode:
<span class="hljs-keyword">let</span> input: <span class="hljs-built_in">seq</span>[<span class="hljs-built_in">int</span>] = toSeq(<span class="hljs-string">"2020/input01.txt"</span>.lines).map(parseInt)
<span class="hljs-keyword">echo</span> input.len
<span class="hljs-keyword">echo</span> input[<span class="hljs-number">0</span> .. <span class="hljs-number">10</span>]
<span class="hljs-keyword">echo</span> input[^<span class="hljs-number">10</span> .. ^<span class="hljs-number">1</span>]
nbText: <span class="hljs-string">"## -- Part 1 --"</span>
nbText: <span class="hljs-string">"""
solution to parse 1 does not necessarily even needs to parse the whole input.
this solution is correct also for the edge case 2010 + 2010"""</span>
nbCode:
<span class="hljs-keyword">var</span> s, t: <span class="hljs-built_in">seq</span>[<span class="hljs-built_in">int</span>] <span class="hljs-comment"># t used in part 2</span>
<span class="hljs-keyword">for</span> n <span class="hljs-keyword">in</span> input:
<span class="hljs-keyword">if</span> n < <span class="hljs-number">1010</span>:
t.add n
<span class="hljs-keyword">if</span> <span class="hljs-number">2020</span> - n <span class="hljs-keyword">in</span> s:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part 1: "</span>, n*(<span class="hljs-number">2020</span> - n)
s.add n
gotTheStar
nbText: <span class="hljs-string">"## -- Part 2 --"</span>
nbCode:
s.sort()
t.sort()
<span class="hljs-keyword">block</span> outer:
<span class="hljs-keyword">for</span> i, n <span class="hljs-keyword">in</span> s:
<span class="hljs-keyword">for</span> m <span class="hljs-keyword">in</span> s[(i + <span class="hljs-number">1</span>) .. ^<span class="hljs-number">1</span>]:
<span class="hljs-keyword">for</span> k <span class="hljs-keyword">in</span> t:
<span class="hljs-keyword">if</span> n + m + k == <span class="hljs-number">2020</span>:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part 2: "</span>, n*m*k
<span class="hljs-keyword">break</span> outer
<span class="hljs-keyword">if</span> n + m + k > <span class="hljs-number">2020</span>:
<span class="hljs-keyword">break</span>
gotTheStar
<span class="hljs-comment"># TODO: fix how code elements look like when not a direct child of pre</span>
<span class="hljs-comment"># nbText: "the above solution is not necessarily correct since `k in t` could be one of `n` or `m`"</span>
nbSave</code></pre>
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