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<!DOCTYPE html>
<html lang="en-us">
<head>
<title>2020\day03.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\day03.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>--- Example ---</h1>
<pre><code class="nim hljs"><span class="hljs-keyword">let</span> example = <span class="hljs-string">"""..##.......
#...#...#..
.#....#..#.
..#.#...#.#
.#...##..#.
..#.##.....
.#.#.#....#
.#........#
#.##...#...
#...##....#
.#..#...#.#"""</span>.strip
<span class="hljs-keyword">echo</span> example</code></pre>
<pre><samp>..##.......
#...#...#..
.#....#..#.
..#.#...#.#
.#...##..#.
..#.##.....
.#.#.#....#
.#........#
#.##...#...
#...##....#
.#..#...#.#</samp></pre>
<pre><code class="nim hljs"><span class="hljs-keyword">type</span>
<span class="hljs-type">StrideMap</span> = <span class="hljs-keyword">object</span>
data: <span class="hljs-built_in">seq</span>[<span class="hljs-built_in">char</span>]
stride: <span class="hljs-built_in">int</span>
height: <span class="hljs-built_in">int</span>
<span class="hljs-type">Shape</span> = <span class="hljs-keyword">tuple</span>[stride, height: <span class="hljs-built_in">int</span>]
<span class="hljs-keyword">proc</span> parse(text: <span class="hljs-built_in">string</span>): <span class="hljs-type">StrideMap</span> =
<span class="hljs-keyword">for</span> line <span class="hljs-keyword">in</span> text.splitLines:
inc <span class="hljs-literal">result</span>.height
<span class="hljs-literal">result</span>.data.add toSeq(line)
<span class="hljs-keyword">if</span> <span class="hljs-literal">result</span>.stride > <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> line.len != <span class="hljs-literal">result</span>.stride:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"ParseError: line does not matches stride"</span>
<span class="hljs-literal">result</span>.stride = line.len
<span class="hljs-keyword">let</span> map0 = parse example
<span class="hljs-keyword">func</span> shape(m: <span class="hljs-type">StrideMap</span>): <span class="hljs-type">Shape</span> =
(m.stride, m.height)
<span class="hljs-keyword">echo</span> <span class="hljs-string">"shape:"</span>, map0.shape</code></pre>
<pre><samp>shape:(stride: 11, height: 11)</samp></pre>
<p>let's add coordinates:</p>
<pre><code class="nim hljs"><span class="hljs-keyword">type</span>
<span class="hljs-type">Point</span> = <span class="hljs-keyword">tuple</span>[x, y: <span class="hljs-built_in">int</span>]
<span class="hljs-keyword">proc</span> index(p: <span class="hljs-type">Point</span>; m: <span class="hljs-type">StrideMap</span>): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">var</span> x = p.x <span class="hljs-keyword">mod</span> m.stride
<span class="hljs-keyword">if</span> p.y >= m.height:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"ERROR: point too low!"</span>
x + p.y * m.stride
<span class="hljs-keyword">proc</span> `[]`(m: <span class="hljs-type">StrideMap</span>; p: <span class="hljs-type">Point</span>): <span class="hljs-built_in">char</span> =
m.data[p.index m]
<span class="hljs-keyword">for</span> p <span class="hljs-keyword">in</span> [(<span class="hljs-number">3</span>, <span class="hljs-number">1</span>), (<span class="hljs-number">6</span>, <span class="hljs-number">2</span>)]:
<span class="hljs-keyword">echo</span> p
<span class="hljs-keyword">echo</span> <span class="hljs-string">"index: "</span>, p.index(map0)
<span class="hljs-keyword">echo</span> <span class="hljs-string">"on map: "</span>, map0[p]</code></pre>
<pre><samp>(3, 1)
index: 14
on map: .
(6, 2)
index: 28
on map: #</samp></pre>
<pre><code class="nim hljs"><span class="hljs-keyword">type</span>
<span class="hljs-type">Slope</span> = <span class="hljs-keyword">tuple</span>[dx, dy: <span class="hljs-built_in">int</span>]
<span class="hljs-type">Path</span> = <span class="hljs-built_in">seq</span>[<span class="hljs-type">Point</span>]
<span class="hljs-type">Ride</span> = <span class="hljs-keyword">tuple</span>[path: <span class="hljs-type">Path</span>, ntrees: <span class="hljs-built_in">int</span>]
<span class="hljs-keyword">proc</span> `+`(p: <span class="hljs-type">Point</span>; s: <span class="hljs-type">Slope</span>): <span class="hljs-type">Point</span> =
<span class="hljs-literal">result</span>.x = p.x + s.dx
<span class="hljs-literal">result</span>.y = p.y + s.dy
<span class="hljs-keyword">proc</span> ride(m: <span class="hljs-type">StrideMap</span>; s: <span class="hljs-type">Slope</span>): <span class="hljs-type">Ride</span> =
<span class="hljs-keyword">var</span> p: <span class="hljs-type">Point</span>
<span class="hljs-keyword">let</span> ySteps = m.height <span class="hljs-keyword">div</span> s.dy
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-number">1</span> ..< ySteps:
p = p + s
<span class="hljs-literal">result</span>.path.add p
<span class="hljs-keyword">if</span> m[p] == <span class="hljs-string">'#'</span>:
inc <span class="hljs-literal">result</span>.ntrees
<span class="hljs-keyword">let</span> ride0 = ride(map0, (<span class="hljs-number">3</span>, <span class="hljs-number">1</span>))
<span class="hljs-keyword">echo</span> <span class="hljs-string">"ntrees: "</span>, ride0.ntrees</code></pre>
<pre><samp>ntrees: 7</samp></pre>
<h2>--- Part 1 ---</h2>
<p>now we are equipped to solve part1:</p>
<pre><code class="nim hljs"><span class="hljs-keyword">let</span>
input = <span class="hljs-string">"2020/input03.txt"</span>.readFile
map1 = parse input
ride1 = ride(map1, (<span class="hljs-number">3</span>, <span class="hljs-number">1</span>))
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part1: "</span>, ride1.ntrees</code></pre>
<pre><samp>part1: 205</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>
<p>easy second part</p>
<p>tricky last slope made me discover my implementation bug!</p>
<p>now onto part2 on my puzzle input</p>
<pre><code class="nim hljs">part2 = <span class="hljs-number">1</span>
<span class="hljs-keyword">for</span> slope <span class="hljs-keyword">in</span> slopes:
part2 *= ride(map1, slope).ntrees
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part2: "</span>, part2</code></pre>
<pre><samp>part2: 3952146825</samp></pre>
<p>That's the right answer! You are <em class="star">one gold star</em> closer to saving your vacation.</p>
<h1>Visualizations</h1>
<p>I want to try to take advantage of the fact that I output html.</p>
<p>I will reproduce the explantory design showing the ride through the example.</p>
<pre><code class="nim hljs"><span class="hljs-keyword">proc</span> show(m: <span class="hljs-type">StrideMap</span>; r: <span class="hljs-type">Ride</span>; repeat = <span class="hljs-number">6</span>) =
<span class="hljs-keyword">var</span> line = <span class="hljs-string">""</span>
<span class="hljs-keyword">var</span>
i = <span class="hljs-number">0</span>
j = <span class="hljs-number">0</span>
p: <span class="hljs-type">Point</span> = r.path[j]
c: <span class="hljs-built_in">char</span>
<span class="hljs-keyword">for</span> y <span class="hljs-keyword">in</span> <span class="hljs-number">0</span> ..< m.height:
<span class="hljs-keyword">for</span> x <span class="hljs-keyword">in</span> <span class="hljs-number">0</span> ..< m.stride:
line.add m.data[i]
inc i
line = line.repeat(repeat)
<span class="hljs-keyword">if</span> y == p.y:
c = <span class="hljs-keyword">if</span> m[p] == <span class="hljs-string">'.'</span>:
<span class="hljs-string">'O'</span> <span class="hljs-keyword">else</span>:
<span class="hljs-string">'X'</span>
line = line[<span class="hljs-number">0</span> ..< p.x] & <span class="hljs-string">"<em>"</span> & $c & <span class="hljs-string">"</em>"</span> & line[p.x + <span class="hljs-number">1</span> .. ^<span class="hljs-number">1</span>]
inc j
<span class="hljs-keyword">if</span> j < r.path.len:
p = r.path[j]
<span class="hljs-keyword">echo</span> line
line = <span class="hljs-string">""</span>
show(map0, ride0)
<span class="hljs-keyword">echo</span> map1.shape</code></pre>
<pre><samp>..##.........##.........##.........##.........##.........##.......
#..<em>O</em>#...#..#...#...#..#...#...#..#...#...#..#...#...#..#...#...#..
.#....<em>X</em>..#..#....#..#..#....#..#..#....#..#..#....#..#..#....#..#.
..#.#...#<em>O</em>#..#.#...#.#..#.#...#.#..#.#...#.#..#.#...#.#..#.#...#.#
.#...##..#..<em>X</em>...##..#..#...##..#..#...##..#..#...##..#..#...##..#.
..#.##.......#.<em>X</em>#.......#.##.......#.##.......#.##.......#.##.....
.#.#.#....#.#.#.#.<em>O</em>..#.#.#.#....#.#.#.#....#.#.#.#....#.#.#.#....#
.#........#.#........<em>X</em>.#........#.#........#.#........#.#........#
#.##...#...#.##...#...#.<em>X</em>#...#...#.##...#...#.##...#...#.##...#...
#...##....##...##....##...#<em>X</em>....##...##....##...##....##...##....#
.#..#...#.#.#..#...#.#.#..#...<em>X</em>.#.#..#...#.#.#..#...#.#.#..#...#.#
(stride: 31, height: 323)</samp></pre>
</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
nbText: <span class="hljs-string">"# --- Example ---"</span>
nbCode:
<span class="hljs-keyword">let</span> example = <span class="hljs-string">"""
..##.......
#...#...#..
.#....#..#.
..#.#...#.#
.#...##..#.
..#.##.....
.#.#.#....#
.#........#
#.##...#...
#...##....#
.#..#...#.#"""</span>.strip
<span class="hljs-keyword">echo</span> example
nbCode:
<span class="hljs-keyword">type</span>
<span class="hljs-type">StrideMap</span> = <span class="hljs-keyword">object</span>
data: <span class="hljs-built_in">seq</span>[<span class="hljs-built_in">char</span>]
stride: <span class="hljs-built_in">int</span>
height: <span class="hljs-built_in">int</span>
<span class="hljs-type">Shape</span> = <span class="hljs-keyword">tuple</span>[stride, height: <span class="hljs-built_in">int</span>]
<span class="hljs-keyword">proc</span> parse(text: <span class="hljs-built_in">string</span>): <span class="hljs-type">StrideMap</span> =
<span class="hljs-keyword">for</span> line <span class="hljs-keyword">in</span> text.splitLines:
inc <span class="hljs-literal">result</span>.height
<span class="hljs-literal">result</span>.data.add toSeq(line)
<span class="hljs-keyword">if</span> <span class="hljs-literal">result</span>.stride > <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> line.len != <span class="hljs-literal">result</span>.stride:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"ParseError: line does not matches stride"</span>
<span class="hljs-literal">result</span>.stride = line.len
<span class="hljs-keyword">let</span> map0 = parse example
<span class="hljs-keyword">func</span> shape(m: <span class="hljs-type">StrideMap</span>): <span class="hljs-type">Shape</span> = (m.stride, m.height)
<span class="hljs-keyword">echo</span> <span class="hljs-string">"shape:"</span>, map0.shape
nbText: <span class="hljs-string">"let's add coordinates:"</span>
nbCode:
<span class="hljs-keyword">type</span>
<span class="hljs-type">Point</span> = <span class="hljs-keyword">tuple</span>[x, y: <span class="hljs-built_in">int</span>]
<span class="hljs-keyword">proc</span> index(p: <span class="hljs-type">Point</span>, m: <span class="hljs-type">StrideMap</span>): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">var</span> x = p.x <span class="hljs-keyword">mod</span> m.stride
<span class="hljs-keyword">if</span> p.y >= m.height: <span class="hljs-keyword">echo</span> <span class="hljs-string">"ERROR: point too low!"</span>
x + p.y*m.stride
<span class="hljs-keyword">proc</span> `[]`(m: <span class="hljs-type">StrideMap</span>, p: <span class="hljs-type">Point</span>): <span class="hljs-built_in">char</span> =
m.data[p.index m]
<span class="hljs-keyword">for</span> p <span class="hljs-keyword">in</span> [(<span class="hljs-number">3</span>, <span class="hljs-number">1</span>), (<span class="hljs-number">6</span>, <span class="hljs-number">2</span>)]:
<span class="hljs-keyword">echo</span> p
<span class="hljs-keyword">echo</span> <span class="hljs-string">"index: "</span>, p.index(map0)
<span class="hljs-keyword">echo</span> <span class="hljs-string">"on map: "</span>, map0[p]
nbCode:
<span class="hljs-keyword">type</span>
<span class="hljs-type">Slope</span> = <span class="hljs-keyword">tuple</span>[dx, dy: <span class="hljs-built_in">int</span>]
<span class="hljs-type">Path</span> = <span class="hljs-built_in">seq</span>[<span class="hljs-type">Point</span>]
<span class="hljs-type">Ride</span> = <span class="hljs-keyword">tuple</span>[path: <span class="hljs-type">Path</span>, ntrees: <span class="hljs-built_in">int</span>]
<span class="hljs-keyword">proc</span> `+`(p: <span class="hljs-type">Point</span>, s: <span class="hljs-type">Slope</span>): <span class="hljs-type">Point</span> =
<span class="hljs-literal">result</span>.x = p.x + s.dx
<span class="hljs-literal">result</span>.y = p.y + s.dy
<span class="hljs-keyword">proc</span> ride(m: <span class="hljs-type">StrideMap</span>, s: <span class="hljs-type">Slope</span>): <span class="hljs-type">Ride</span> =
<span class="hljs-keyword">var</span> p: <span class="hljs-type">Point</span>
<span class="hljs-keyword">let</span> ySteps = m.height <span class="hljs-keyword">div</span> s.dy <span class="hljs-comment"># this part I forgot on first round</span>
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-number">1</span> ..< ySteps:
p = p + s
<span class="hljs-literal">result</span>.path.add p
<span class="hljs-keyword">if</span> m[p] == <span class="hljs-string">'#'</span>:
inc <span class="hljs-literal">result</span>.ntrees
<span class="hljs-keyword">let</span> ride0 = ride(map0, (<span class="hljs-number">3</span>, <span class="hljs-number">1</span>))
<span class="hljs-keyword">echo</span> <span class="hljs-string">"ntrees: "</span>, ride0.ntrees <span class="hljs-comment"># expect 7</span>
nbText: <span class="hljs-string">"""## --- Part 1 ---
now we are equipped to solve part1:"""</span>
nbCode:
<span class="hljs-keyword">let</span>
input = <span class="hljs-string">"2020/input03.txt"</span>.readFile
map1 = parse input
ride1 = ride(map1, (<span class="hljs-number">3</span>, <span class="hljs-number">1</span>))
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part1: "</span>, ride1.ntrees
gotTheStar
nbText: <span class="hljs-string">"""## --- Part 2 ---
easy second part"""</span>
<span class="hljs-keyword">template</span> nbNone(body: <span class="hljs-built_in">untyped</span>) = body
nbNone:
<span class="hljs-keyword">let</span> slopes = [(<span class="hljs-number">1</span>, <span class="hljs-number">1</span>), (<span class="hljs-number">3</span>, <span class="hljs-number">1</span>), (<span class="hljs-number">5</span>, <span class="hljs-number">1</span>), (<span class="hljs-number">7</span>, <span class="hljs-number">1</span>), (<span class="hljs-number">1</span>, <span class="hljs-number">2</span>)]
<span class="hljs-keyword">var</span>
ntrees2: <span class="hljs-built_in">int</span>
part2 = <span class="hljs-number">1</span>
<span class="hljs-comment"># Example first, I expect: 2, 7, 3, 4, and 2. Total: 336</span>
<span class="hljs-keyword">for</span> slope <span class="hljs-keyword">in</span> slopes:
<span class="hljs-keyword">echo</span> slope
ntrees2 = ride(map0, slope).ntrees
<span class="hljs-keyword">echo</span> ntrees2
part2 *= ntrees2
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part2(example): "</span>, part2
nbText: <span class="hljs-string">"tricky last slope made me discover my implementation bug!"</span>
nbText: <span class="hljs-string">"now onto part2 on my puzzle input"</span>
nbCode:
part2 = <span class="hljs-number">1</span>
<span class="hljs-keyword">for</span> slope <span class="hljs-keyword">in</span> slopes:
part2 *= ride(map1, slope).ntrees
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part2: "</span>, part2
gotTheStar
nbText: <span class="hljs-string">"# Visualizations"</span>
nbText: <span class="hljs-string">"""I want to try to take advantage of the fact that I output html.
I will reproduce the explantory design showing the ride through the example.
"""</span>
nbCode:
<span class="hljs-keyword">proc</span> show(m: <span class="hljs-type">StrideMap</span>, r: <span class="hljs-type">Ride</span>, repeat=<span class="hljs-number">6</span>) =
<span class="hljs-keyword">var</span> line = <span class="hljs-string">""</span>
<span class="hljs-keyword">var</span>
i = <span class="hljs-number">0</span>
j = <span class="hljs-number">0</span>
p: <span class="hljs-type">Point</span> = r.path[j]
c: <span class="hljs-built_in">char</span>
<span class="hljs-keyword">for</span> y <span class="hljs-keyword">in</span> <span class="hljs-number">0</span> ..< m.height:
<span class="hljs-keyword">for</span> x <span class="hljs-keyword">in</span> <span class="hljs-number">0</span> ..< m.stride:
line.add m.data[i]
inc i
line = line.repeat(repeat)
<span class="hljs-keyword">if</span> y == p.y:
c = <span class="hljs-keyword">if</span> m[p] == <span class="hljs-string">'.'</span>: <span class="hljs-string">'O'</span> <span class="hljs-keyword">else</span>: <span class="hljs-string">'X'</span>
line = line[<span class="hljs-number">0</span> ..< p.x] & <span class="hljs-string">"<em>"</span> & $c & <span class="hljs-string">"</em>"</span> & line[p.x + <span class="hljs-number">1</span> .. ^<span class="hljs-number">1</span>]
inc j
<span class="hljs-keyword">if</span> j < r.path.len:
p = r.path[j]
<span class="hljs-keyword">echo</span> line
line = <span class="hljs-string">""</span>
show(map0, ride0)
<span class="hljs-keyword">echo</span> map1.shape
<span class="hljs-comment"># hey: nbBlock is not available! I need to inject it!!</span>
<span class="hljs-comment"># nbBlock.output = "<span style=\"\">" & nbBlock.output & "</span>"</span>
nbSave</code></pre>
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