2020-19 part 1 in haskell

2020/19-Monster_Messages/example

@@ -0,0 +1,12 @@
+0: 4 1 5
+1: 2 3 | 3 2
+2: 4 4 | 5 5
+3: 4 5 | 5 4
+4: "a"
+5: "b"
+
+ababbb
+bababa
+abbbab
+aaabbb
+aaaabbb

2020/19-Monster_Messages/first.hs

@@ -0,0 +1,91 @@
+-- requires cabal install --lib megaparsec parser-combinators
+module Main (main) where
+import Control.Monad (void, when)
+import Data.Either
+import Data.List (foldl')
+import Data.Maybe (isJust)
+import Data.Map qualified as M
+import Data.Void (Void)
+import Text.Megaparsec
+import Text.Megaparsec.Char
+import System.Exit (die)
+
+exampleExpectedOutput = 2
+
+type Match = Char
+type RuleID = Int
+type Action = [RuleID]
+type Rule = Either Match [Action]
+type Message = String
+data Input = Input { rules :: M.Map RuleID Rule
+                   , messages :: [Message]
+                   } deriving (Show)
+
+type Parser = Parsec Void String
+
+parseInt :: Parser Int
+parseInt = do
+  n <- some digitChar
+  void $ optional (char ' ')
+  return $ read n
+
+parseMatch :: Parser Match
+parseMatch = do
+  void $ char '"'
+  c <- letterChar
+  void $ char '"'
+  return c
+
+parseAction :: Parser Action
+parseAction = some (parseInt <* optional (char ' '))
+
+parseRule :: Parser (RuleID, Rule)
+parseRule = do
+  id <- some digitChar
+  void $ string ": "
+  rule <- (Left <$> parseMatch) <|> (Right <$> some (parseAction <* optional (string "| ")))
+  void $ char '\n'
+  return $ (read id, rule)
+
+parseInput' :: Parser Input
+parseInput' = do
+  rules <- M.fromList <$> some parseRule
+  void $ char '\n'
+  messages <- some (some letterChar <* (optional $ char '\n'))
+  void eof
+  return $ Input rules messages
+
+parseInput :: String -> IO Input
+parseInput filename = do
+  input <- readFile filename
+  case runParser parseInput' filename input of
+    Left bundle -> die $ errorBundlePretty bundle
+    Right input' -> return input'
+
+compute :: Input -> Int
+compute (Input rules messages) = length . filter id $ map isValid messages
+  where
+    isValid :: Message -> Bool
+    isValid msg = case matches 0 msg of
+      Just "" -> True
+      otherwise -> False
+    matches :: RuleID -> Message -> Maybe Message
+    matches ruleId msg = case rules M.! ruleId of
+      Left c -> if head msg == c then (Just $ tail msg) else Nothing
+      Right actions -> case map (processAction msg) actions of
+        Nothing:a:_ -> a
+        a:_ -> a
+        otherwise -> Nothing
+    processAction :: Message -> Action -> Maybe Message
+    processAction msg action = foldl' step (Just msg) action
+    step :: Maybe Message -> RuleID -> Maybe Message
+    step Nothing _ = Nothing
+    step (Just msg) ruleID = matches ruleID msg
+
+main :: IO ()
+main = do
+  example <- parseInput "example"
+  let exampleOutput = compute example
+  when  (exampleOutput /= exampleExpectedOutput)  (die $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput)
+  input <- parseInput "input"
+  print $ compute input

2020/19-Monster_Messages/input

@@ -0,0 +1,480 @@
+66: 69 116 | 9 115
+91: 95 9 | 109 69
+14: 110 69 | 15 9
+4: 119 9 | 61 69
+17: 9 23 | 69 93
+37: 118 69 | 94 9
+68: 9 80 | 69 19
+117: 37 9 | 45 69
+132: 9 109
+74: 9 25 | 69 126
+102: 122 9 | 6 69
+98: 89 9 | 99 69
+113: 83 9 | 7 69
+92: 9 16 | 69 50
+33: 9 39 | 69 133
+134: 95 69 | 7 9
+57: 9 7 | 69 110
+31: 9 66 | 69 51
+47: 9 3 | 69 83
+21: 69 123 | 9 129
+104: 9 86 | 69 7
+40: 69 24 | 9 34
+32: 9 44 | 69 88
+45: 49 69 | 48 9
+2: 69 88 | 9 23
+5: 3 9 | 110 69
+108: 20 86
+76: 97 9 | 113 69
+56: 9 121 | 69 58
+29: 69 13 | 9 82
+123: 86 20
+46: 23 69 | 95 9
+19: 7 69 | 109 9
+12: 93 9 | 95 69
+75: 85 9 | 128 69
+127: 93 69 | 83 9
+61: 9 7 | 69 23
+78: 9 132 | 69 107
+121: 88 69 | 23 9
+60: 33 69 | 76 9
+73: 26 69 | 100 9
+116: 9 60 | 69 75
+93: 69 9
+38: 9 106 | 69 110
+107: 9 7 | 69 86
+82: 5 69 | 64 9
+58: 44 69 | 23 9
+34: 69 57 | 9 104
+124: 69 106 | 9 44
+109: 69 9 | 9 9
+48: 69 44 | 9 83
+28: 9 83 | 69 7
+64: 9 93 | 69 7
+54: 9 102 | 69 40
+94: 83 69 | 7 9
+80: 9 86 | 69 3
+62: 86 69 | 83 9
+42: 125 69 | 70 9
+71: 69 112 | 9 114
+8: 42
+131: 69 44 | 9 7
+88: 69 9 | 9 69
+87: 15 69 | 7 9
+3: 9 9 | 69 69
+9: "b"
+41: 21 69 | 78 9
+65: 9 69 | 69 20
+128: 134 69 | 101 9
+44: 9 69 | 69 69
+51: 9 18 | 69 54
+55: 69 79 | 9 5
+95: 69 69 | 69 9
+110: 9 69
+22: 92 69 | 10 9
+67: 9 44 | 69 23
+7: 9 20 | 69 69
+90: 69 96 | 9 68
+53: 111 9 | 27 69
+125: 69 72 | 9 22
+11: 42 31
+23: 9 69 | 9 9
+114: 69 105 | 9 131
+81: 53 69 | 29 9
+69: "a"
+1: 86 9 | 95 69
+18: 9 73 | 69 90
+83: 20 20
+130: 89 69 | 47 9
+89: 44 9 | 93 69
+15: 9 9
+0: 8 11
+105: 69 110
+13: 135 9 | 14 69
+6: 69 105 | 9 132
+103: 120 69 | 71 9
+85: 1 69 | 2 9
+96: 89 9 | 12 69
+101: 69 95 | 9 23
+39: 69 15 | 9 109
+133: 88 69 | 65 9
+86: 69 20 | 9 9
+122: 127 9 | 43 69
+20: 69 | 9
+52: 69 109 | 9 3
+119: 15 69 | 88 9
+77: 9 7 | 69 93
+50: 87 9 | 61 69
+129: 9 65 | 69 110
+97: 69 95 | 9 93
+111: 59 69 | 35 9
+115: 69 84 | 9 41
+84: 36 69 | 4 9
+72: 117 9 | 74 69
+135: 110 69
+112: 62 69 | 124 9
+43: 69 3 | 9 15
+118: 109 9 | 93 69
+49: 69 23 | 9 83
+26: 69 67
+63: 106 9 | 44 69
+70: 103 69 | 81 9
+25: 17 9 | 77 69
+36: 91 9 | 32 69
+10: 69 98 | 9 56
+30: 9 109 | 69 3
+126: 9 28 | 69 63
+16: 9 38 | 69 30
+99: 106 9 | 109 69
+59: 23 9 | 3 69
+120: 130 9 | 55 69
+27: 69 91 | 9 108
+24: 46 69 | 52 9
+35: 9 93 | 69 109
+100: 9 101 | 69 80
+106: 69 69
+79: 44 69 | 65 9
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