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authorTom Smeding <tom.smeding@gmail.com>2020-12-02 09:27:30 +0100
committerTom Smeding <tom.smeding@gmail.com>2020-12-02 09:27:30 +0100
commita9983e2f6ce4f444b5adeeb909ecc70bc568c3f4 (patch)
tree4ca52e897d6b323408c9bafaf38b7fa17dcbc235 /2020
parentec5353f4018c7e1ad56d521e38ec06af8d938d97 (diff)
Day 2
Diffstat (limited to '2020')
-rw-r--r--2020/2.hs40
-rw-r--r--2020/2.in1000
-rw-r--r--2020/Makefile5
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 @@
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diff --git a/2020/Makefile b/2020/Makefile
index b48727b..b05b096 100644
--- a/2020/Makefile
+++ 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 $@