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@ -22,8 +22,7 @@ https://adventofcode.com/2020/
|14 | | `**` | | |14 | | `**` | |
|15 | `**` | | | |15 | `**` | | |
|16 | | `**` | | |16 | | `**` | |
|17 | | `**` | | |17 | | | |
|18 | | `**` | | |18 | | `**` | |
|19 | | `**` | |
`test.sh` can be used to run all solutions and automatically compares them to (my) puzzle inputs and the expected outputs. `test.sh` can be used to run all solutions and automatically compares them to (my) puzzle inputs and the expected outputs.

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90: 86 86
122: 86 1 | 99 20
116: 86 58 | 99 75
20: 86 123
62: 99 95 | 86 113
81: 76 99 | 90 86
106: 120 86 | 93 99
73: 99 72 | 86 45
117: 131 99 | 72 86
92: 86 96 | 99 98
13: 3 99 | 118 86
56: 90 86 | 58 99
85: 72 99 | 51 86
51: 99 99 | 86 86
59: 99 25 | 86 62
65: 99 15 | 86 97
112: 86 13 | 99 38
46: 33 86 | 2 99
10: 67 86 | 68 99
33: 120 99 | 76 86
38: 35 86 | 125 99
26: 86 10 | 99 55
1: 33 99 | 60 86
8: 42
16: 51 86 | 93 99
107: 40 99 | 2 86
40: 17 120
34: 86 82 | 99 127
88: 93 17
2: 99 51 | 86 120
32: 100 99 | 7 86
113: 86 127 | 99 82
14: 73 86 | 44 99
25: 86 101 | 99 56
130: 110 86 | 109 99
19: 86 4 | 99 49
30: 86 92 | 99 70
27: 17 86 | 86 99
94: 47 86 | 53 99
115: 86 107 | 99 84
15: 76 99 | 58 86
58: 86 99
105: 130 86 | 32 99
71: 120 99 | 131 86
12: 99 131 | 86 82
60: 72 86 | 93 99
84: 86 102 | 99 80
44: 99 76 | 86 72
125: 76 99 | 131 86
18: 99 71 | 86 52
129: 37 86 | 111 99
102: 99 131 | 86 76
66: 86 105 | 99 41
99: "a"
9: 99 18 | 86 65
131: 17 99 | 99 86
39: 76 99 | 93 86
64: 115 99 | 114 86
57: 86 48 | 99 94
35: 72 86 | 51 99
0: 8 11
77: 86 83 | 99 106
118: 72 86 | 75 99
47: 99 103 | 86 85
23: 99 27 | 86 76
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75: 86 99 | 99 99
101: 51 99 | 27 86
103: 90 99 | 90 86
128: 86 69 | 99 33
70: 99 14 | 86 19
52: 127 86 | 90 99
21: 86 24 | 99 59
22: 86 63 | 99 12
42: 79 86 | 66 99
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104: 86 33 | 99 28
100: 99 16 | 86 39
72: 99 86
78: 86 43 | 99 50
55: 86 6 | 99 34
45: 99 99
5: 86 46 | 99 77
93: 99 99 | 99 86
6: 131 99 | 51 86
110: 71 86 | 28 99
68: 90 86 | 27 99
29: 87 86 | 122 99
80: 86 93 | 99 131
54: 120 86 | 75 99
43: 93 86
98: 99 103 | 86 117
7: 101 86 | 88 99
127: 17 86 | 99 99
96: 86 12 | 99 61
41: 99 5 | 86 112
79: 86 57 | 99 21
11: 42 31
86: "b"
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63: 76 99 | 127 86
124: 86 81 | 99 116
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82: 99 86 | 86 99
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114: 99 129 | 86 22
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53: 91 99 | 95 86
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4: 99 131 | 86 58
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37: 99 58
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@ -1,40 +0,0 @@
{-# LANGUAGE TypeSynonymInstances, FlexibleInstances, DataKinds #-}
module Day17 where
import AoC
import Data.List
import Data.Vector.Sized (Vector)
import qualified Data.Vector.Sized as V
import Data.Map (Map)
import qualified Data.Map as M
import Data.Set (Set)
import qualified Data.Set as S
class Index i where
neighbours :: i -> [i]
addIndex :: i -> i -> i
instance (Num a, Eq a) => Index (Vector n a) where
neighbours i = filter (/= i) . V.mapM (flip map [-1, 0, 1] . (+)) $ i
addIndex = V.zipWith (+)
counts :: Ord a => [a] -> Map a Int
counts = M.fromList . map (\xs -> (head xs, length xs)) . group . sort
neighbourCounts :: (Index i, Ord i) => Set i -> Map i Int
neighbourCounts = counts . concatMap neighbours . S.elems
update :: (Index i, Ord i) => (Int -> Bool) -> (Int -> Bool) -> Set i -> Set i
update create destroy old = M.keysSet $ M.filterWithKey shouldLive $ M.fromSet (flip (M.findWithDefault 0) nCounts) indices
where nCounts = neighbourCounts old
indices = S.union old $ M.keysSet nCounts
shouldLive ix n = if S.notMember ix old then create n else not $ destroy n
run6 :: (Index i, Ord i) => Set i -> Int
run6 = S.size . (!! 6) . iterate (update (==3) (`notElem` [2, 3]))
main = runAoC (toIndices . lines) (run6 . S.fromList . map extendIndex) (run6 . S.fromList . map (extendIndex . extendIndex))
where toIndices input = [V.fromTuple (row, col) :: Vector 2 Int | (row, line) <- zip [0..] input, (col, '#') <- zip [0..] line]
extendIndex = V.cons 0

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module Day19 where
import AoC
import Control.Applicative
import Data.Char
import Data.Foldable
import Data.Map (Map, (!))
import qualified Data.Map as M
import Data.Maybe
import Data.Tuple
import Text.ParserCombinators.ReadP
import Text.Read.Lex
data RuleElement = Literal String | Reference Int
parseElement :: ReadP RuleElement
parseElement = parseRef <|> parseLit
where parseRef = Reference <$> readDecP
parseLit = Literal <$> between (char '"') (char '"') (many1 $ satisfy isAlphaNum)
parseRule :: ReadP (Int, [[RuleElement]])
parseRule = do ruleNum <- readDecP
string ": "
alternatives <- parseAlternatives
return (ruleNum, alternatives)
where parseAlternatives = parseSequence `sepBy` string " | "
parseSequence = parseElement `sepBy` char ' '
buildParser :: Map Int [[RuleElement]] -> Int -> ReadP String
buildParser m i = buildAlternatives $ m ! i
where buildAlternatives = asum . map buildSequence
buildSequence = foldl1 (liftA2 (++)) . map buildElement
buildElement (Literal s) = string s
buildElement (Reference j) = buildParser m j
countRootMatches :: [String] -> Map Int [[RuleElement]] -> Int
countRootMatches input rules = length . filter (isJust . oneCompleteResult rootParser) $ input
where rootParser = buildParser rules 0
main = runAoC splitInput run (run . withExtraRules)
where splitInput = swap . fmap tail . break (=="") . lines
withExtraRules = fmap (++ ["8: 42 | 42 8", "11: 42 31 | 42 11 31"])
run = uncurry countRootMatches . fmap parseRules
parseRules = M.fromList . map (fromJust . oneCompleteResult parseRule)