-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathday15.html
257 lines (234 loc) · 17 KB
/
day15.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
<!DOCTYPE html>
<html lang="en-us">
<head>
<title>2020\day15.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\day15.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>
<h2>2020, Day 15: Rambunctious Recitation 🔥 🎭</h2>
<p>This Advent of code seems to be about presents:</p>
<ul>
<li>First present today: <em>rambunctious</em> or "full of energy and difficult to control".</li>
<li>Second present: <a href="http://oeis.org/A181391">Van Eck's sequence</a>,
see also the <a href="https://www.numberphile.com/videos/van-eck-sequence">Numberphile episode</a></li>
<li>Third present: part 2 is just simple brute force.</li>
<li>Is the fourth present going to be someone from Advent of Code discovering something
new about this interesting sequence?</li>
</ul>
<p>Nothing much to say about the implementation. I had to debug a bit in order to get
part 1 straight. Part 2 took around 5 seconds on my machine.</p>
<pre><code class="nim hljs"><span class="hljs-keyword">import</span>
tables, times
<span class="hljs-keyword">template</span> upd() =
<span class="hljs-comment">## extracted since it is repeated twice</span>
<span class="hljs-keyword">if</span> last <span class="hljs-keyword">notin</span> spoken:
spoken[last] = turn
<span class="hljs-keyword">elif</span> last <span class="hljs-keyword">notin</span> spokenAgain:
spokenAgain[last] = turn
<span class="hljs-keyword">else</span>:
spoken[last] = spokenAgain[last]
spokenAgain[last] = turn
<span class="hljs-keyword">var</span> nTurns = <span class="hljs-number">2020</span>
<span class="hljs-keyword">proc</span> play(numbers: openarray[<span class="hljs-built_in">int</span>]): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">var</span>
spoken = initTable[<span class="hljs-built_in">int</span>, <span class="hljs-built_in">int</span>]()
spokenAgain = initTable[<span class="hljs-built_in">int</span>, <span class="hljs-built_in">int</span>]()
last: <span class="hljs-built_in">int</span>
<span class="hljs-keyword">for</span> turn <span class="hljs-keyword">in</span> <span class="hljs-number">1</span> .. nTurns:
<span class="hljs-keyword">if</span> turn <= numbers.len:
last = numbers[turn - <span class="hljs-number">1</span>]
spoken[last] = turn
<span class="hljs-keyword">elif</span> last <span class="hljs-keyword">in</span> spoken <span class="hljs-keyword">and</span> last <span class="hljs-keyword">notIn</span> spokenAgain:
last = <span class="hljs-number">0</span>
upd
<span class="hljs-keyword">elif</span> last <span class="hljs-keyword">in</span> spoken <span class="hljs-keyword">and</span> last <span class="hljs-keyword">in</span> spokenAgain:
last = spokenAgain[last] - spoken[last]
upd
<span class="hljs-keyword">else</span>:
<span class="hljs-keyword">return</span> -<span class="hljs-number">1</span>
last
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">0</span>, <span class="hljs-number">3</span>, <span class="hljs-number">6</span>] <span class="hljs-comment">## 436</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">1</span>, <span class="hljs-number">3</span>, <span class="hljs-number">2</span>] <span class="hljs-comment">## 1</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">2</span>, <span class="hljs-number">1</span>, <span class="hljs-number">3</span>] <span class="hljs-comment">## 10</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>] <span class="hljs-comment">## 27</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">1</span>] <span class="hljs-comment">## 78</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">3</span>, <span class="hljs-number">2</span>, <span class="hljs-number">1</span>] <span class="hljs-comment">## 438</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">3</span>, <span class="hljs-number">1</span>, <span class="hljs-number">2</span>] <span class="hljs-comment">## 1836</span>
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part 1: "</span>, play [<span class="hljs-number">15</span>, <span class="hljs-number">5</span>, <span class="hljs-number">1</span>, <span class="hljs-number">4</span>, <span class="hljs-number">7</span>, <span class="hljs-number">0</span>] <span class="hljs-comment">## 1259</span></code></pre>
<pre><samp>436
1
10
27
78
438
1836
part 1: 1259</samp></pre>
<p>That's the right answer! You are <em class="star">one gold star</em> closer to saving your vacation.</p>
<pre><code class="nim hljs">nTurns = <span class="hljs-number">30000000</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">0</span>, <span class="hljs-number">3</span>, <span class="hljs-number">6</span>] <span class="hljs-comment">## 175594</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">1</span>, <span class="hljs-number">3</span>, <span class="hljs-number">2</span>] <span class="hljs-comment">## 2578</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">2</span>, <span class="hljs-number">1</span>, <span class="hljs-number">3</span>] <span class="hljs-comment">## 3544142</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>] <span class="hljs-comment">## 261214</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">1</span>] <span class="hljs-comment">## 6895259</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">3</span>, <span class="hljs-number">2</span>, <span class="hljs-number">1</span>] <span class="hljs-comment">## 18</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">3</span>, <span class="hljs-number">1</span>, <span class="hljs-number">2</span>] <span class="hljs-comment">## 362</span>
<span class="hljs-keyword">let</span> start = now()
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part 2: "</span>, play [<span class="hljs-number">15</span>, <span class="hljs-number">5</span>, <span class="hljs-number">1</span>, <span class="hljs-number">4</span>, <span class="hljs-number">7</span>, <span class="hljs-number">0</span>] <span class="hljs-comment">## 689</span>
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part 2 completed in "</span>, now() - start</code></pre>
<pre><samp>175594
2578
3544142
261214
6895259
18
362
part 2: 689
part 2 completed in 5 seconds, 502 milliseconds, 622 microseconds, and 600 nanoseconds</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, nimoji
nbInit
nbText: <span class="hljs-string">"""## 2020, Day 15: Rambunctious Recitation :fire: :performing_arts:
This Advent of code seems to be about presents:
* First present today: _rambunctious_ or "full of energy and difficult to control".
* Second present: [Van Eck's sequence](http://oeis.org/A181391),
see also the [Numberphile episode](https://www.numberphile.com/videos/van-eck-sequence)
* Third present: part 2 is just simple brute force.
* Is the fourth present going to be someone from Advent of Code discovering something
new about this interesting sequence?
Nothing much to say about the implementation. I had to debug a bit in order to get
part 1 straight. Part 2 took around 5 seconds on my machine.
"""</span>.emojize
nbCode:
<span class="hljs-keyword">import</span> tables, times
<span class="hljs-keyword">template</span> upd = <span class="hljs-comment">## extracted since it is repeated twice</span>
<span class="hljs-keyword">if</span> last <span class="hljs-keyword">notin</span> spoken:
spoken[last] = turn
<span class="hljs-keyword">elif</span> last <span class="hljs-keyword">notin</span> spokenAgain:
spokenAgain[last] = turn
<span class="hljs-keyword">else</span>:
spoken[last] = spokenAgain[last]
spokenAgain[last] = turn
<span class="hljs-keyword">var</span> nTurns = <span class="hljs-number">2020</span>
<span class="hljs-keyword">proc</span> play(numbers: openarray[<span class="hljs-built_in">int</span>]): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">var</span>
spoken = initTable[<span class="hljs-built_in">int</span>, <span class="hljs-built_in">int</span>]()
spokenAgain = initTable[<span class="hljs-built_in">int</span>, <span class="hljs-built_in">int</span>]()
last: <span class="hljs-built_in">int</span>
<span class="hljs-keyword">for</span> turn <span class="hljs-keyword">in</span> <span class="hljs-number">1</span> .. nTurns:
<span class="hljs-comment">#echo "turn: ", turn</span>
<span class="hljs-keyword">if</span> turn <= numbers.len:
last = numbers[turn - <span class="hljs-number">1</span>]
spoken[last] = turn
<span class="hljs-comment">#echo " starting number, I speak ", last</span>
<span class="hljs-keyword">elif</span> last <span class="hljs-keyword">in</span> spoken <span class="hljs-keyword">and</span> last <span class="hljs-keyword">notIn</span> spokenAgain:
<span class="hljs-comment">#echo " ", last, " is first time spoken, I speak 0"</span>
last = <span class="hljs-number">0</span>
upd
<span class="hljs-keyword">elif</span> last <span class="hljs-keyword">in</span> spoken <span class="hljs-keyword">and</span> last <span class="hljs-keyword">in</span> spokenAgain:
<span class="hljs-comment">#echo " ", last, " was spoken in ",spoken[last], " and in ", spokenAgain[last]</span>
last = spokenAgain[last] - spoken[last]
<span class="hljs-comment">#echo " I say ", last</span>
upd
<span class="hljs-keyword">else</span>:
<span class="hljs-comment">#echo " ERROR I should not be here"</span>
<span class="hljs-keyword">return</span> -<span class="hljs-number">1</span>
last
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">0</span>,<span class="hljs-number">3</span>,<span class="hljs-number">6</span>] <span class="hljs-comment">## 436</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">1</span>, <span class="hljs-number">3</span>, <span class="hljs-number">2</span>] <span class="hljs-comment">## 1</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">2</span>, <span class="hljs-number">1</span>, <span class="hljs-number">3</span>] <span class="hljs-comment">## 10</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>] <span class="hljs-comment">## 27</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">1</span>] <span class="hljs-comment">## 78</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">3</span>, <span class="hljs-number">2</span>, <span class="hljs-number">1</span>] <span class="hljs-comment">## 438</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">3</span>, <span class="hljs-number">1</span>, <span class="hljs-number">2</span>] <span class="hljs-comment">## 1836</span>
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part 1: "</span>, play [<span class="hljs-number">15</span>,<span class="hljs-number">5</span>,<span class="hljs-number">1</span>,<span class="hljs-number">4</span>,<span class="hljs-number">7</span>,<span class="hljs-number">0</span>] <span class="hljs-comment">## 1259</span>
gotTheStar
nbCode:
nTurns = <span class="hljs-number">30_000_000</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">0</span>,<span class="hljs-number">3</span>,<span class="hljs-number">6</span>] <span class="hljs-comment">## 175594</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">1</span>, <span class="hljs-number">3</span>, <span class="hljs-number">2</span>] <span class="hljs-comment">## 2578</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">2</span>, <span class="hljs-number">1</span>, <span class="hljs-number">3</span>] <span class="hljs-comment">## 3544142</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>] <span class="hljs-comment">## 261214</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">1</span>] <span class="hljs-comment">## 6895259</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">3</span>, <span class="hljs-number">2</span>, <span class="hljs-number">1</span>] <span class="hljs-comment">## 18</span>
<span class="hljs-keyword">echo</span> play [<span class="hljs-number">3</span>, <span class="hljs-number">1</span>, <span class="hljs-number">2</span>] <span class="hljs-comment">## 362</span>
<span class="hljs-keyword">let</span> start = now()
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part 2: "</span>, play [<span class="hljs-number">15</span>,<span class="hljs-number">5</span>,<span class="hljs-number">1</span>,<span class="hljs-number">4</span>,<span class="hljs-number">7</span>,<span class="hljs-number">0</span>] <span class="hljs-comment">## 689</span>
<span class="hljs-keyword">echo</span> <span class="hljs-string">"part 2 completed in "</span>, now() - start
gotTheStar
nbSave</code></pre>
</section><script>
function toggleSourceDisplay() {
var btn = document.getElementById("show")
var source = document.getElementById("source");
if (btn.innerHTML=="Show Source") {
btn.innerHTML = "Hide Source";
source.style.display = "block";
} else {
btn.innerHTML = "Show Source";
source.style.display = "none";
}
}
</script></body>
</html>