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<!DOCTYPE html>
<html lang="en-us">
<head>
<title>2020\day11.nim</title>
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<div class="nb-box">
<span><a href="..">🏡</a></span>
<span><code>2020\day11.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>
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<h2>2020, Day 11: Seating System</h2>
<p>standard day with a grid. Highlights:</p>
<ul>
<li>a clean refactoring after part1 to solve part2</li>
<li>ran into an expected issue when copying a sequence inside a proc (fixed with Orc, see: <a href="https://forum.nim-lang.org/t/7241">forum</a>)</li>
</ul>
<pre><code class="nim hljs"><span class="hljs-keyword">import</span>
strutils, nimoji
<span class="hljs-keyword">when</span> <span class="hljs-keyword">defined</span>(gcOrc):
<span class="hljs-keyword">echo</span> <span class="hljs-string">"using Orc :japanese_ogre:"</span>.emojize</code></pre>
<pre><samp>using Orc 👹</samp></pre>
<p>First we parse and show the example grid.</p>
<pre><code class="nim hljs"><span class="hljs-keyword">type</span>
<span class="hljs-type">SeatGridKind</span> = <span class="hljs-keyword">enum</span>
sgFloor = <span class="hljs-string">"."</span>, sgEmpty = <span class="hljs-string">"L"</span>, sgOccupied = <span class="hljs-string">"#"</span>
<span class="hljs-type">SeatGrid</span> = <span class="hljs-keyword">object</span>
data: <span class="hljs-built_in">seq</span>[<span class="hljs-type">SeatGridKind</span>]
ncols: <span class="hljs-built_in">int</span>
<span class="hljs-keyword">let</span> example = <span class="hljs-string">"""L.LL.LL.LL
LLLLLLL.LL
L.L.L..L..
LLLL.LL.LL
L.LL.LL.LL
L.LLLLL.LL
..L.L.....
LLLLLLLLLL
L.LLLLLL.L
L.LLLLL.LL"""</span>.replace(
<span class="hljs-string">"</span><span class="hljs-meta">\c</span><span class="hljs-string">"</span>, <span class="hljs-string">""</span>)
<span class="hljs-keyword">proc</span> parse(text: <span class="hljs-built_in">string</span>): <span class="hljs-type">SeatGrid</span> =
<span class="hljs-keyword">for</span> i, c <span class="hljs-keyword">in</span> text:
<span class="hljs-keyword">case</span> c
<span class="hljs-keyword">of</span> <span class="hljs-string">'.'</span>:
<span class="hljs-literal">result</span>.data.add sgFloor
<span class="hljs-keyword">of</span> <span class="hljs-string">'L'</span>:
<span class="hljs-literal">result</span>.data.add sgEmpty
<span class="hljs-keyword">of</span> <span class="hljs-string">'\n'</span>:
<span class="hljs-keyword">if</span> <span class="hljs-literal">result</span>.ncols == <span class="hljs-number">0</span>:
<span class="hljs-literal">result</span>.ncols = <span class="hljs-literal">result</span>.data.len
<span class="hljs-keyword">elif</span> <span class="hljs-literal">result</span>.data.len <span class="hljs-keyword">mod</span> <span class="hljs-literal">result</span>.ncols != <span class="hljs-number">0</span>:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"ERROR expect same number of columns "</span>, i, <span class="hljs-string">" "</span>, c
<span class="hljs-keyword">else</span>:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"ERROR cannot parse "</span>, i, <span class="hljs-string">" "</span>, c
<span class="hljs-keyword">proc</span> `$`(g: <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">string</span> =
<span class="hljs-keyword">for</span> i, d <span class="hljs-keyword">in</span> g.data:
<span class="hljs-literal">result</span>.add:
<span class="hljs-keyword">case</span> d
<span class="hljs-keyword">of</span> sgFloor:
<span class="hljs-string">"."</span>
<span class="hljs-keyword">of</span> sgEmpty:
<span class="hljs-string">"L"</span>
<span class="hljs-keyword">of</span> sgOccupied:
<span class="hljs-string">"#"</span>
<span class="hljs-keyword">if</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols == <span class="hljs-number">0</span>:
<span class="hljs-literal">result</span>.add <span class="hljs-string">"</span><span class="hljs-meta">\n</span><span class="hljs-string">"</span>
<span class="hljs-keyword">var</span> exGrid = parse example
<span class="hljs-keyword">echo</span> exGrid
<span class="hljs-keyword">func</span> nrows(g: <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">int</span> =
g.data.len <span class="hljs-keyword">div</span> g.ncols
<span class="hljs-keyword">echo</span> exGrid.nrows</code></pre>
<pre><samp>L.LL.LL.LL
LLLLLLL.LL
L.L.L..L..
LLLL.LL.LL
L.LL.LL.LL
L.LLLLL.LL
..L.L.....
LLLLLLLLLL
L.LLLLLL.L
L.LLLLL.LL
10</samp></pre>
<p>now we define a function to get adjacent indices. In part 2 we refactored this to use a <code>dir</code> function:</p>
<pre><code class="nim hljs"><span class="hljs-keyword">when</span> <span class="hljs-keyword">defined</span>(part1):
<span class="hljs-keyword">iterator</span> adjIdx(i: <span class="hljs-built_in">int</span>; g: <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">if</span> i >= g.ncols:
<span class="hljs-keyword">yield</span> i - g.ncols <span class="hljs-comment">## up</span>
<span class="hljs-keyword">if</span> i >= g.ncols <span class="hljs-keyword">and</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>:
<span class="hljs-keyword">yield</span> i - g.ncols + <span class="hljs-number">1</span> <span class="hljs-comment">## up-right</span>
<span class="hljs-keyword">if</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>:
<span class="hljs-keyword">yield</span> i + <span class="hljs-number">1</span> <span class="hljs-comment">## right</span>
<span class="hljs-keyword">if</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> (i + g.ncols) < g.data.len:
<span class="hljs-keyword">yield</span> i + g.ncols + <span class="hljs-number">1</span> <span class="hljs-comment">## right-down</span>
<span class="hljs-keyword">if</span> (i + g.ncols) < g.data.len:
<span class="hljs-keyword">yield</span> i + g.ncols <span class="hljs-comment">## down</span>
<span class="hljs-keyword">if</span> (i + g.ncols) < g.data.len <span class="hljs-keyword">and</span> i <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>:
<span class="hljs-keyword">yield</span> i + g.ncols - <span class="hljs-number">1</span> <span class="hljs-comment">## down-left</span>
<span class="hljs-keyword">if</span> i <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>:
<span class="hljs-keyword">yield</span> i - <span class="hljs-number">1</span> <span class="hljs-comment">## left</span>
<span class="hljs-keyword">if</span> i <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> i >= g.ncols:
<span class="hljs-keyword">yield</span> i - g.ncols - <span class="hljs-number">1</span> <span class="hljs-comment">## left-up</span>
<span class="hljs-keyword">else</span>:
<span class="hljs-keyword">type</span>
<span class="hljs-type">Direction</span> = <span class="hljs-keyword">enum</span>
up, upright, right, rightdown, down, downleft, left, leftup
<span class="hljs-keyword">func</span> dir(i: <span class="hljs-built_in">int</span>; d: <span class="hljs-type">Direction</span>; g: <span class="hljs-type">SeatGrid</span>): (<span class="hljs-built_in">bool</span>, <span class="hljs-built_in">int</span>) =
<span class="hljs-literal">result</span> = (<span class="hljs-literal">false</span>, i)
<span class="hljs-keyword">case</span> d
<span class="hljs-keyword">of</span> up:
<span class="hljs-keyword">if</span> i >= g.ncols:
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i - g.ncols) <span class="hljs-comment">## up</span>
<span class="hljs-keyword">of</span> upright:
<span class="hljs-keyword">if</span> i >= g.ncols <span class="hljs-keyword">and</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>:
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i - g.ncols + <span class="hljs-number">1</span>) <span class="hljs-comment">## up-right</span>
<span class="hljs-keyword">of</span> right:
<span class="hljs-keyword">if</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>:
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i + <span class="hljs-number">1</span>) <span class="hljs-comment">## right</span>
<span class="hljs-keyword">of</span> rightdown:
<span class="hljs-keyword">if</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> (i + g.ncols) < g.data.len:
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i + g.ncols + <span class="hljs-number">1</span>) <span class="hljs-comment">## right-down</span>
<span class="hljs-keyword">of</span> down:
<span class="hljs-keyword">if</span> (i + g.ncols) < g.data.len:
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i + g.ncols) <span class="hljs-comment">## down</span>
<span class="hljs-keyword">of</span> downleft:
<span class="hljs-keyword">if</span> (i + g.ncols) < g.data.len <span class="hljs-keyword">and</span> i <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>:
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i + g.ncols - <span class="hljs-number">1</span>) <span class="hljs-comment">## down-left</span>
<span class="hljs-keyword">of</span> left:
<span class="hljs-keyword">if</span> i <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>:
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i - <span class="hljs-number">1</span>) <span class="hljs-comment">## left</span>
<span class="hljs-keyword">of</span> leftup:
<span class="hljs-keyword">if</span> i <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> i >= g.ncols:
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i - g.ncols - <span class="hljs-number">1</span>) <span class="hljs-comment">## left-up</span>
<span class="hljs-keyword">iterator</span> adjIdx(i: <span class="hljs-built_in">int</span>; g: <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">var</span> r = (<span class="hljs-literal">false</span>, <span class="hljs-number">0</span>)
<span class="hljs-keyword">for</span> d <span class="hljs-keyword">in</span> <span class="hljs-type">Direction</span>:
r = dir(i, d, g)
<span class="hljs-keyword">if</span> r[<span class="hljs-number">0</span>]:
<span class="hljs-keyword">yield</span> r[<span class="hljs-number">1</span>]
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> [<span class="hljs-number">0</span>, <span class="hljs-number">5</span>, <span class="hljs-number">9</span>, <span class="hljs-number">40</span>, <span class="hljs-number">45</span>, <span class="hljs-number">49</span>, <span class="hljs-number">90</span>, <span class="hljs-number">95</span>, <span class="hljs-number">99</span>]:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"adjIdx "</span>, i
<span class="hljs-keyword">for</span> j <span class="hljs-keyword">in</span> adjIdx(i, exGrid):
<span class="hljs-keyword">echo</span> <span class="hljs-string">" "</span>, j</code></pre>
<pre><samp>adjIdx 0
1
11
10
adjIdx 5
6
16
15
14
4
adjIdx 9
19
18
8
adjIdx 40
30
31
41
51
50
adjIdx 45
35
36
46
56
55
54
44
34
adjIdx 49
39
59
58
48
38
adjIdx 90
80
81
91
adjIdx 95
85
86
96
94
84
adjIdx 99
89
98
88</samp></pre>
<p>a <code>step</code> proc to solve part1. this is where I ran in the <em>issue</em></p>
<pre><code class="nim hljs"><span class="hljs-keyword">proc</span> step(g: <span class="hljs-keyword">var</span> <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">when</span> <span class="hljs-keyword">defined</span>(gcOrc):
<span class="hljs-keyword">let</span> data = g.data <span class="hljs-comment">## snapshot of grid</span>
<span class="hljs-keyword">else</span>:
<span class="hljs-keyword">var</span> data = g.data
<span class="hljs-keyword">var</span> numOcc: <span class="hljs-built_in">int</span>
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-number">0</span> .. g.data.<span class="hljs-keyword">high</span>:
numOcc = <span class="hljs-number">0</span>
<span class="hljs-keyword">for</span> j <span class="hljs-keyword">in</span> adjIdx(i, g):
<span class="hljs-keyword">if</span> data[j] == sgOccupied:
inc numOcc
<span class="hljs-keyword">if</span> data[i] == sgEmpty <span class="hljs-keyword">and</span> numOcc == <span class="hljs-number">0</span>:
g.data[i] = sgOccupied
inc <span class="hljs-literal">result</span>
<span class="hljs-keyword">elif</span> data[i] == sgOccupied <span class="hljs-keyword">and</span> numOcc >= <span class="hljs-number">4</span>:
g.data[i] = sgEmpty
inc <span class="hljs-literal">result</span>
<span class="hljs-keyword">func</span> countOcc(g: <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">for</span> s <span class="hljs-keyword">in</span> g.data:
<span class="hljs-keyword">if</span> s == sgOccupied:
inc <span class="hljs-literal">result</span>
<span class="hljs-keyword">var</span> i = <span class="hljs-number">1</span>
<span class="hljs-keyword">while</span> step(exGrid) > <span class="hljs-number">0</span>:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"step: "</span>, i
<span class="hljs-keyword">echo</span> exGrid
inc i
<span class="hljs-keyword">echo</span> <span class="hljs-string">"numOcc: "</span>, countOcc(exGrid) <span class="hljs-comment">## 37</span>
<span class="hljs-keyword">let</span> input = <span class="hljs-string">"2020/input11.txt"</span>.readFile.replace(<span class="hljs-string">"</span><span class="hljs-meta">\c</span><span class="hljs-string">"</span>, <span class="hljs-string">""</span>)
<span class="hljs-keyword">var</span> inpGrid = parse input
<span class="hljs-keyword">echo</span> (inpGrid.ncols, inpGrid.nrows)
i = <span class="hljs-number">1</span>
<span class="hljs-keyword">while</span> step(inpGrid) > <span class="hljs-number">0</span>:
inc i
<span class="hljs-keyword">echo</span> <span class="hljs-string">"stops at step: "</span>, i <span class="hljs-comment">## 98</span>
<span class="hljs-keyword">echo</span> <span class="hljs-string">"numOcc: "</span>, countOcc(inpGrid) <span class="hljs-comment">## 2334</span></code></pre>
<pre><samp>step: 1
#.##.##.##
#######.##
#.#.#..#..
####.##.##
#.##.##.##
#.#####.##
..#.#.....
##########
#.######.#
#.#####.##
step: 2
#.LL.L#.##
#LLLLLL.L#
L.L.L..L..
#LLL.LL.L#
#.LL.LL.LL
#.LLLL#.##
..L.L.....
#LLLLLLLL#
#.LLLLLL.L
#.#LLLL.##
step: 3
#.##.L#.##
#L###LL.L#
L.#.#..#..
#L##.##.L#
#.##.LL.LL
#.###L#.##
..#.#.....
#L######L#
#.LL###L.L
#.#L###.##
step: 4
#.#L.L#.##
#LLL#LL.L#
L.L.L..#..
#LLL.##.L#
#.LL.LL.LL
#.LL#L#.##
..L.L.....
#L#LLLL#L#
#.LLLLLL.L
#.#L#L#.##
step: 5
#.#L.L#.##
#LLL#LL.L#
L.#.L..#..
#L##.##.L#
#.#L.LL.LL
#.#L#L#.##
..L.L.....
#L#L##L#L#
#.LLLLLL.L
#.#L#L#.##
numOcc: 37
(97, 92)
stops at step: 98
numOcc: 2334</samp></pre>
<p>That's the right answer! You are <em class="star">one gold star</em> closer to saving your vacation.</p>
<p>and a <code>step2</code> proc to solve part2</p>
<pre><code class="nim hljs"><span class="hljs-keyword">when</span> <span class="hljs-keyword">not</span> <span class="hljs-keyword">defined</span>(part1):
<span class="hljs-keyword">echo</span> <span class="hljs-string">"</span><span class="hljs-meta">\n</span><span class="hljs-meta">---Part2---\n</span><span class="hljs-string">"</span>
<span class="hljs-keyword">proc</span> step2(g: <span class="hljs-keyword">var</span> <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">when</span> <span class="hljs-keyword">defined</span>(gcOrc):
<span class="hljs-keyword">let</span> data = g.data <span class="hljs-comment">## snapshot of grid</span>
<span class="hljs-keyword">else</span>:
<span class="hljs-keyword">var</span> data = g.data
<span class="hljs-keyword">var</span> numOcc: <span class="hljs-built_in">int</span>
<span class="hljs-keyword">var</span> r = (<span class="hljs-literal">false</span>, <span class="hljs-number">0</span>)
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-number">0</span> .. g.data.<span class="hljs-keyword">high</span>:
numOcc = <span class="hljs-number">0</span>
<span class="hljs-keyword">for</span> d <span class="hljs-keyword">in</span> <span class="hljs-type">Direction</span>:
r = dir(i, d, g)
<span class="hljs-keyword">while</span> r[<span class="hljs-number">0</span>] <span class="hljs-keyword">and</span> data[r[<span class="hljs-number">1</span>]] == sgFloor:
r = dir(r[<span class="hljs-number">1</span>], d, g)
<span class="hljs-keyword">if</span> r[<span class="hljs-number">0</span>] <span class="hljs-keyword">and</span> data[r[<span class="hljs-number">1</span>]] == sgOccupied:
inc numOcc
<span class="hljs-keyword">if</span> data[i] == sgEmpty <span class="hljs-keyword">and</span> numOcc == <span class="hljs-number">0</span>:
g.data[i] = sgOccupied
inc <span class="hljs-literal">result</span>
<span class="hljs-keyword">elif</span> data[i] == sgOccupied <span class="hljs-keyword">and</span> numOcc >= <span class="hljs-number">5</span>:
g.data[i] = sgEmpty
inc <span class="hljs-literal">result</span>
i = <span class="hljs-number">1</span>
exGrid = parse example
<span class="hljs-keyword">while</span> step2(exGrid) > <span class="hljs-number">0</span>:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"step: "</span>, i
<span class="hljs-keyword">echo</span> exGrid
inc i
<span class="hljs-keyword">echo</span> <span class="hljs-string">"numOcc: "</span>, countOcc(exGrid) <span class="hljs-comment">## 26</span>
inpGrid = parse input
i = <span class="hljs-number">1</span>
<span class="hljs-keyword">while</span> step2(inpGrid) > <span class="hljs-number">0</span>:
inc i
<span class="hljs-keyword">echo</span> <span class="hljs-string">"stops at step: "</span>, i <span class="hljs-comment">## 86</span>
<span class="hljs-keyword">echo</span> <span class="hljs-string">"numOcc: "</span>, countOcc(inpGrid) <span class="hljs-comment">## 2100</span></code></pre>
<pre><samp>---Part2---
step: 1
#.##.##.##
#######.##
#.#.#..#..
####.##.##
#.##.##.##
#.#####.##
..#.#.....
##########
#.######.#
#.#####.##
step: 2
#.LL.LL.L#
#LLLLLL.LL
L.L.L..L..
LLLL.LL.LL
L.LL.LL.LL
L.LLLLL.LL
..L.L.....
LLLLLLLLL#
#.LLLLLL.L
#.LLLLL.L#
step: 3
#.L#.##.L#
#L#####.LL
L.#.#..#..
##L#.##.##
#.##.#L.##
#.#####.#L
..#.#.....
LLL####LL#
#.L#####.L
#.L####.L#
step: 4
#.L#.L#.L#
#LLLLLL.LL
L.L.L..#..
##LL.LL.L#
L.LL.LL.L#
#.LLLLL.LL
..L.L.....
LLLLLLLLL#
#.LLLLL#.L
#.L#LL#.L#
step: 5
#.L#.L#.L#
#LLLLLL.LL
L.L.L..#..
##L#.#L.L#
L.L#.#L.L#
#.L####.LL
..#.#.....
LLL###LLL#
#.LLLLL#.L
#.L#LL#.L#
step: 6
#.L#.L#.L#
#LLLLLL.LL
L.L.L..#..
##L#.#L.L#
L.L#.LL.L#
#.LLLL#.LL
..#.L.....
LLL###LLL#
#.LLLLL#.L
#.L#LL#.L#
numOcc: 26
stops at step: 86
numOcc: 2100</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
nbText: <span class="hljs-string">"## 2020, Day 11: Seating System"</span>
nbText: <span class="hljs-string">"""standard day with a grid. Highlights:
* a clean refactoring after part1 to solve part2
* ran into an expected issue when copying a sequence inside a proc (fixed with Orc, see: [forum](https://forum.nim-lang.org/t/7241))
"""</span>
nbCode:
<span class="hljs-keyword">import</span> strutils, nimoji
<span class="hljs-keyword">when</span> <span class="hljs-keyword">defined</span>(gcOrc):
<span class="hljs-keyword">echo</span> <span class="hljs-string">"using Orc :japanese_ogre:"</span>.emojize
nbText: <span class="hljs-string">"First we parse and show the example grid."</span>
nbCode:
<span class="hljs-keyword">type</span>
<span class="hljs-type">SeatGridKind</span> = <span class="hljs-keyword">enum</span>
sgFloor = <span class="hljs-string">"."</span>, sgEmpty = <span class="hljs-string">"L"</span>, sgOccupied = <span class="hljs-string">"#"</span>
<span class="hljs-type">SeatGrid</span> = <span class="hljs-keyword">object</span>
data: <span class="hljs-built_in">seq</span>[<span class="hljs-type">SeatGridKind</span>]
ncols: <span class="hljs-built_in">int</span>
<span class="hljs-keyword">let</span> example = <span class="hljs-string">"""L.LL.LL.LL
LLLLLLL.LL
L.L.L..L..
LLLL.LL.LL
L.LL.LL.LL
L.LLLLL.LL
..L.L.....
LLLLLLLLLL
L.LLLLLL.L
L.LLLLL.LL"""</span>.replace(<span class="hljs-string">"</span><span class="hljs-meta">\r</span><span class="hljs-string">"</span>, <span class="hljs-string">""</span>) <span class="hljs-comment"># I have had issues before (with the input)</span>
<span class="hljs-keyword">proc</span> parse(text: <span class="hljs-built_in">string</span>): <span class="hljs-type">SeatGrid</span> =
<span class="hljs-keyword">for</span> i, c <span class="hljs-keyword">in</span> text:
<span class="hljs-keyword">case</span> c:
<span class="hljs-keyword">of</span> <span class="hljs-string">'.'</span>:
<span class="hljs-literal">result</span>.data.add sgFloor
<span class="hljs-keyword">of</span> <span class="hljs-string">'L'</span>:
<span class="hljs-literal">result</span>.data.add sgEmpty
<span class="hljs-keyword">of</span> <span class="hljs-string">'\n'</span>:
<span class="hljs-keyword">if</span> <span class="hljs-literal">result</span>.ncols == <span class="hljs-number">0</span>:
<span class="hljs-literal">result</span>.ncols = <span class="hljs-literal">result</span>.data.len
<span class="hljs-keyword">elif</span> <span class="hljs-literal">result</span>.data.len <span class="hljs-keyword">mod</span> <span class="hljs-literal">result</span>.ncols != <span class="hljs-number">0</span>:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"ERROR expect same number of columns "</span>, i, <span class="hljs-string">" "</span>, c
<span class="hljs-keyword">else</span>:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"ERROR cannot parse "</span>, i, <span class="hljs-string">" "</span>, c
<span class="hljs-keyword">proc</span> `$`(g: <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">string</span> =
<span class="hljs-keyword">for</span> i, d <span class="hljs-keyword">in</span> g.data:
<span class="hljs-literal">result</span>.add:
<span class="hljs-keyword">case</span> d:
<span class="hljs-keyword">of</span> sgFloor:
<span class="hljs-string">"."</span>
<span class="hljs-keyword">of</span> sgEmpty:
<span class="hljs-string">"L"</span>
<span class="hljs-keyword">of</span> sgOccupied:
<span class="hljs-string">"#"</span>
<span class="hljs-keyword">if</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols == <span class="hljs-number">0</span>:
<span class="hljs-literal">result</span>.add <span class="hljs-string">"</span><span class="hljs-meta">\n</span><span class="hljs-string">"</span>
<span class="hljs-keyword">var</span> exGrid = parse example
<span class="hljs-keyword">echo</span> exGrid
<span class="hljs-keyword">func</span> nrows(g: <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">int</span> =
g.data.len <span class="hljs-keyword">div</span> g.ncols
<span class="hljs-keyword">echo</span> exGrid.nrows <span class="hljs-comment"># 10</span>
nbText: <span class="hljs-string">"now we define a function to get adjacent indices. In part 2 we refactored this to use a `dir` function:"</span>
nbCode:
<span class="hljs-keyword">when</span> <span class="hljs-keyword">defined</span>(part1):
<span class="hljs-keyword">iterator</span> adjIdx(i: <span class="hljs-built_in">int</span>, g: <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">if</span> i >= g.ncols: <span class="hljs-comment">## not first row</span>
<span class="hljs-keyword">yield</span> i - g.ncols <span class="hljs-comment">## up</span>
<span class="hljs-keyword">if</span> i >= g.ncols <span class="hljs-keyword">and</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>: <span class="hljs-comment">## .. and not last column</span>
<span class="hljs-keyword">yield</span> i - g.ncols + <span class="hljs-number">1</span> <span class="hljs-comment">## up-right</span>
<span class="hljs-keyword">if</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>: <span class="hljs-comment">## not last column</span>
<span class="hljs-keyword">yield</span> i + <span class="hljs-number">1</span> <span class="hljs-comment">## right</span>
<span class="hljs-keyword">if</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> (i + g.ncols) < g.data.len: <span class="hljs-comment">## .. and not last row</span>
<span class="hljs-keyword">yield</span> i + g.ncols + <span class="hljs-number">1</span> <span class="hljs-comment">## right-down</span>
<span class="hljs-keyword">if</span> (i + g.ncols) < g.data.len: <span class="hljs-comment">## not last row</span>
<span class="hljs-keyword">yield</span> i + g.ncols <span class="hljs-comment">## down</span>
<span class="hljs-keyword">if</span> (i + g.ncols) < g.data.len <span class="hljs-keyword">and</span> i <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>: <span class="hljs-comment">## .. and not first column</span>
<span class="hljs-keyword">yield</span> i + g.ncols - <span class="hljs-number">1</span> <span class="hljs-comment">## down-left</span>
<span class="hljs-keyword">if</span> i <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>: <span class="hljs-comment">## not first column</span>
<span class="hljs-keyword">yield</span> i - <span class="hljs-number">1</span> <span class="hljs-comment">## left</span>
<span class="hljs-keyword">if</span> i <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> i >= g.ncols: <span class="hljs-comment">## .. and not first row</span>
<span class="hljs-keyword">yield</span> i - g.ncols - <span class="hljs-number">1</span> <span class="hljs-comment">## left-up</span>
<span class="hljs-keyword">else</span>:
<span class="hljs-comment"># refactor adjIdx for part2</span>
<span class="hljs-keyword">type</span> <span class="hljs-type">Direction</span> = <span class="hljs-keyword">enum</span>
up, upright, right, rightdown, down, downleft, left, leftup
<span class="hljs-keyword">func</span> dir(i: <span class="hljs-built_in">int</span>, d: <span class="hljs-type">Direction</span>, g: <span class="hljs-type">SeatGrid</span>): (<span class="hljs-built_in">bool</span>, <span class="hljs-built_in">int</span>) =
<span class="hljs-literal">result</span> = (<span class="hljs-literal">false</span>, i)
<span class="hljs-keyword">case</span> d:
<span class="hljs-keyword">of</span> up:
<span class="hljs-keyword">if</span> i >= g.ncols: <span class="hljs-comment">## not first row</span>
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i - g.ncols) <span class="hljs-comment">## up</span>
<span class="hljs-keyword">of</span> upright:
<span class="hljs-keyword">if</span> i >= g.ncols <span class="hljs-keyword">and</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>: <span class="hljs-comment">## .. and not last column</span>
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i - g.ncols + <span class="hljs-number">1</span>) <span class="hljs-comment">## up-right</span>
<span class="hljs-keyword">of</span> right:
<span class="hljs-keyword">if</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>: <span class="hljs-comment">## not last column</span>
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i + <span class="hljs-number">1</span> ) <span class="hljs-comment">## right</span>
<span class="hljs-keyword">of</span> rightdown:
<span class="hljs-keyword">if</span> (i + <span class="hljs-number">1</span>) <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> (i + g.ncols) < g.data.len: <span class="hljs-comment">## .. and not last row</span>
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i + g.ncols + <span class="hljs-number">1</span>) <span class="hljs-comment">## right-down</span>
<span class="hljs-keyword">of</span> down:
<span class="hljs-keyword">if</span> (i + g.ncols) < g.data.len: <span class="hljs-comment">## not last row</span>
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i + g.ncols) <span class="hljs-comment">## down</span>
<span class="hljs-keyword">of</span> downleft:
<span class="hljs-keyword">if</span> (i + g.ncols) < g.data.len <span class="hljs-keyword">and</span> i <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>: <span class="hljs-comment">## .. and not first column</span>
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i + g.ncols - <span class="hljs-number">1</span>) <span class="hljs-comment">## down-left</span>
<span class="hljs-keyword">of</span> left:
<span class="hljs-keyword">if</span> i <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span>: <span class="hljs-comment">## not first column</span>
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i - <span class="hljs-number">1</span>) <span class="hljs-comment">## left</span>
<span class="hljs-keyword">of</span> leftup:
<span class="hljs-keyword">if</span> i <span class="hljs-keyword">mod</span> g.ncols != <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> i >= g.ncols: <span class="hljs-comment">## .. and not first row</span>
<span class="hljs-literal">result</span> = (<span class="hljs-literal">true</span>, i - g.ncols - <span class="hljs-number">1</span>) <span class="hljs-comment">## left-up</span>
<span class="hljs-keyword">iterator</span> adjIdx(i: <span class="hljs-built_in">int</span>, g: <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">var</span> r = (<span class="hljs-literal">false</span>, <span class="hljs-number">0</span>)
<span class="hljs-keyword">for</span> d <span class="hljs-keyword">in</span> <span class="hljs-type">Direction</span>:
r = dir(i, d, g)
<span class="hljs-keyword">if</span> r[<span class="hljs-number">0</span>]:
<span class="hljs-keyword">yield</span> r[<span class="hljs-number">1</span>]
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> [<span class="hljs-number">0</span>, <span class="hljs-number">5</span>, <span class="hljs-number">9</span>, <span class="hljs-number">40</span>, <span class="hljs-number">45</span>, <span class="hljs-number">49</span>, <span class="hljs-number">90</span>, <span class="hljs-number">95</span>, <span class="hljs-number">99</span>]:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"adjIdx "</span>, i
<span class="hljs-keyword">for</span> j <span class="hljs-keyword">in</span> adjIdx(i, exGrid):
<span class="hljs-keyword">echo</span> <span class="hljs-string">" "</span>, j
nbText: <span class="hljs-string">"a `step` proc to solve part1. this is where I ran in the _issue_"</span>
nbCode:
<span class="hljs-keyword">proc</span> step(g: <span class="hljs-keyword">var</span> <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">when</span> <span class="hljs-keyword">defined</span>(gcOrc): <span class="hljs-comment">## let data would not work with gcRefc see: https://forum.nim-lang.org/t/7241</span>
<span class="hljs-keyword">let</span> data = g.data <span class="hljs-comment">## snapshot of grid</span>
<span class="hljs-keyword">else</span>:
<span class="hljs-keyword">var</span> data = g.data
<span class="hljs-keyword">var</span> numOcc: <span class="hljs-built_in">int</span>
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-number">0</span> .. g.data.<span class="hljs-keyword">high</span>:
numOcc = <span class="hljs-number">0</span>
<span class="hljs-keyword">for</span> j <span class="hljs-keyword">in</span> adjIdx(i, g):
<span class="hljs-keyword">if</span> data[j] == sgOccupied:
inc numOcc
<span class="hljs-keyword">if</span> data[i] == sgEmpty <span class="hljs-keyword">and</span> numOcc == <span class="hljs-number">0</span>:
g.data[i] = sgOccupied
inc <span class="hljs-literal">result</span>
<span class="hljs-keyword">elif</span> data[i] == sgOccupied <span class="hljs-keyword">and</span> numOcc >= <span class="hljs-number">4</span>:
g.data[i] = sgEmpty
inc <span class="hljs-literal">result</span>
<span class="hljs-keyword">func</span> countOcc(g: <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">for</span> s <span class="hljs-keyword">in</span> g.data:
<span class="hljs-keyword">if</span> s == sgOccupied:
inc <span class="hljs-literal">result</span>
<span class="hljs-keyword">var</span> i = <span class="hljs-number">1</span>
<span class="hljs-keyword">while</span> step(exGrid) > <span class="hljs-number">0</span>:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"step: "</span>, i
<span class="hljs-keyword">echo</span> exGrid
inc i
<span class="hljs-keyword">echo</span> <span class="hljs-string">"numOcc: "</span>, countOcc(exGrid) <span class="hljs-comment">## 37</span>
<span class="hljs-keyword">let</span> input = <span class="hljs-string">"2020/input11.txt"</span>.readFile.replace(<span class="hljs-string">"</span><span class="hljs-meta">\r</span><span class="hljs-string">"</span>, <span class="hljs-string">""</span>)
<span class="hljs-keyword">var</span> inpGrid = parse input
<span class="hljs-keyword">echo</span> (inpGrid.ncols, inpGrid.nrows)
i = <span class="hljs-number">1</span>
<span class="hljs-keyword">while</span> step(inpGrid) > <span class="hljs-number">0</span>:
inc i
<span class="hljs-keyword">echo</span> <span class="hljs-string">"stops at step: "</span>, i <span class="hljs-comment">## 98</span>
<span class="hljs-keyword">echo</span> <span class="hljs-string">"numOcc: "</span>, countOcc(inpGrid) <span class="hljs-comment">## 2334</span>
gotTheStar
nbText: <span class="hljs-string">"and a `step2` proc to solve part2"</span>
nbCode:
<span class="hljs-keyword">when</span> <span class="hljs-keyword">not</span> <span class="hljs-keyword">defined</span>(part1):
<span class="hljs-keyword">echo</span> <span class="hljs-string">"</span><span class="hljs-meta">\n</span><span class="hljs-meta">---Part2---\n</span><span class="hljs-string">"</span>
<span class="hljs-keyword">proc</span> step2(g: <span class="hljs-keyword">var</span> <span class="hljs-type">SeatGrid</span>): <span class="hljs-built_in">int</span> =
<span class="hljs-keyword">when</span> <span class="hljs-keyword">defined</span>(gcOrc): <span class="hljs-comment">## let data would not work with gcRefc see: https://forum.nim-lang.org/t/7241</span>
<span class="hljs-keyword">let</span> data = g.data <span class="hljs-comment">## snapshot of grid</span>
<span class="hljs-keyword">else</span>:
<span class="hljs-keyword">var</span> data = g.data
<span class="hljs-keyword">var</span> numOcc: <span class="hljs-built_in">int</span>
<span class="hljs-keyword">var</span> r = (<span class="hljs-literal">false</span>, <span class="hljs-number">0</span>)
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-number">0</span> .. g.data.<span class="hljs-keyword">high</span>:
numOcc = <span class="hljs-number">0</span>
<span class="hljs-keyword">for</span> d <span class="hljs-keyword">in</span> <span class="hljs-type">Direction</span>:
r = dir(i, d, g)
<span class="hljs-keyword">while</span> r[<span class="hljs-number">0</span>] <span class="hljs-keyword">and</span> data[r[<span class="hljs-number">1</span>]] == sgFloor:
r = dir(r[<span class="hljs-number">1</span>], d, g)
<span class="hljs-keyword">if</span> r[<span class="hljs-number">0</span>] <span class="hljs-keyword">and</span> data[r[<span class="hljs-number">1</span>]] == sgOccupied:
inc numOcc
<span class="hljs-keyword">if</span> data[i] == sgEmpty <span class="hljs-keyword">and</span> numOcc == <span class="hljs-number">0</span>:
g.data[i] = sgOccupied
inc <span class="hljs-literal">result</span>
<span class="hljs-keyword">elif</span> data[i] == sgOccupied <span class="hljs-keyword">and</span> numOcc >= <span class="hljs-number">5</span>:
g.data[i] = sgEmpty
inc <span class="hljs-literal">result</span>
i = <span class="hljs-number">1</span>
exGrid = parse example
<span class="hljs-keyword">while</span> step2(exGrid) > <span class="hljs-number">0</span>:
<span class="hljs-keyword">echo</span> <span class="hljs-string">"step: "</span>, i
<span class="hljs-keyword">echo</span> exGrid
inc i
<span class="hljs-keyword">echo</span> <span class="hljs-string">"numOcc: "</span>, countOcc(exGrid) <span class="hljs-comment">## 26</span>
inpGrid = parse input
i = <span class="hljs-number">1</span>
<span class="hljs-keyword">while</span> step2(inpGrid) > <span class="hljs-number">0</span>:
inc i
<span class="hljs-keyword">echo</span> <span class="hljs-string">"stops at step: "</span>, i <span class="hljs-comment">## 86</span>
<span class="hljs-keyword">echo</span> <span class="hljs-string">"numOcc: "</span>, countOcc(inpGrid) <span class="hljs-comment">## 2100</span>
gotTheStar
nbSave</code></pre>
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