diff options
| -rw-r--r-- | 2020/2.hs | 40 | ||||
| -rw-r--r-- | 2020/2.in | 1000 | ||||
| -rw-r--r-- | 2020/Makefile | 5 |
3 files changed, 1043 insertions, 2 deletions
diff --git a/2020/2.hs b/2020/2.hs new file mode 100644 index 0000000..7b83745 --- /dev/null +++ b/2020/2.hs @@ -0,0 +1,40 @@ +module Main where + +import Text.Parsec (parse, digit, char, string, anyChar, many, many1) + +import Input + + +data Policy = Policy Int Int Char + deriving (Show) + +parseLine :: String -> (Policy, String) +parseLine str = case parse pLine "" str of Right r -> r ; Left e -> error (show e) + where + pLine = do + n1 <- read <$> many1 digit + _ <- char '-' + n2 <- read <$> many1 digit + _ <- char ' ' + c <- anyChar + _ <- string ": " + s <- many anyChar + return (Policy n1 n2 c, s) + +valid1 :: Policy -> String -> Bool +valid1 (Policy l h c) pw = + let count = length (filter (== c) pw) + in l <= count && count <= h + +valid2 :: Policy -> String -> Bool +valid2 (Policy l h c) pw = + let c1 = pw !! (l - 1) ; c2 = pw !! (h - 1) in (c1 == c || c2 == c) && c1 /= c2 + +numValid :: (Policy -> String -> Bool) -> [(Policy, String)] -> Int +numValid f = sum . map (fromEnum . uncurry f) + +main :: IO () +main = do + input <- map parseLine <$> getInput 2 + print (numValid valid1 input) + print (numValid valid2 input) diff --git a/2020/2.in b/2020/2.in new file mode 100644 index 0000000..b553462 --- /dev/null +++ b/2020/2.in @@ -0,0 +1,1000 @@ +15-16 f: ffffffffffffffhf +6-8 b: bbbnvbbb +6-10 z: zhzzzzfzzzzzzzzzpzz +9-13 s: dmssskssqsssssf +5-6 v: hvvgvrm +1-8 s: sssssssssss +1-3 x: kxxx +2-5 c: cckgxcnswc +10-11 j: rjjpwdzkfjj +8-11 r: wkrtlrxcskjglb +3-6 l: mqrnhllxx +5-6 z: zzzzlg +12-13 x: qkrqxtrtsfxpnxg +3-7 k: tsbkkkk +4-11 j: jjjrjjjjjjjjjjj +2-4 c: ccccc +2-15 h: hhkhhhhhhhhhhhth +7-8 k: hgcjkxhkskk +3-10 s: ksxgrkcwfsxrqs +10-14 z: hblznxdzxzzzrz +5-8 z: mknrjhzzrjzl +2-4 v: vqvvjhl +3-5 q: fvzqrq +9-13 f: flfpkfvffdfcz +1-7 b: tbbbbbxbbbbbzbbb +6-8 c: ccchvccccccccvzt +4-5 w: wwwqww +1-7 f: ffffffqf 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b/2020/Makefile @@ -1,5 +1,6 @@ GHC = ghc -GHCFLAGS = -Wall -O2 -threaded +GHCBASEFLAGS = -package parsec +GHCFLAGS = $(GHCBASEFLAGS) -Wall -O2 -threaded CXX = g++ CXXFLAGS = -Wall -Wextra -std=c++17 -O2 @@ -34,7 +35,7 @@ $(OBJDIR)/%: .depend_hs: $(HASKELL_SRC) $(HASKELL_AUX) - ghc -dep-suffix '' -dep-makefile $@ -M $(HASKELL_SRC) + ghc -dep-suffix '' -dep-makefile $@ -M $(GHCBASEFLAGS) $(HASKELL_SRC) rm -f .depend_hs.bak sed 's/\.o *:/:/; s/\.hi$$/.hs/g; s/\.hi[ \t]/.hs/g' <$@ >$@.tmp mv $@.tmp $@ |