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Trying to optimise day 15
[advent-of-code-17.git]
/
src
/
advent15
/
advent15.hs
diff --git
a/src/advent15/advent15.hs
b/src/advent15/advent15.hs
index 7cec0d024da9784b39d3fc7a7d6dcafe4950d2cb..6ee03c04cf0c6a6b53cefd98d10cc954cd772c3a 100644
(file)
--- a/
src/advent15/advent15.hs
+++ b/
src/advent15/advent15.hs
@@
-24,7
+24,7
@@
streamA = stream generatorA generatorAStart
streamB = stream generatorB generatorBStart
generator :: Word64 -> Word64 -> Word64 -> Word64
streamB = stream generatorB generatorBStart
generator :: Word64 -> Word64 -> Word64 -> Word64
-generator divisor factor n =
fromIntegral $ fromIntegral
n * factor `rem` divisor
+generator divisor factor n = n * factor `rem` divisor
toWord16 :: Word64 -> Word16
toWord16 = fromIntegral
toWord16 :: Word64 -> Word16
toWord16 = fromIntegral
@@
-33,5
+33,4
@@
stream :: (Word64 -> Word64) -> Word64 -> [Word16]
stream gen n0 = map toWord16 $ drop 1 $ iterate gen n0
filteredStream :: Word16 -> [Word16] -> [Word16]
stream gen n0 = map toWord16 $ drop 1 $ iterate gen n0
filteredStream :: Word16 -> [Word16] -> [Word16]
-filteredStream f str = filter (\n -> n .&. f == 0) str
-
+filteredStream f str = filter ((== 0) . ( .&. f)) str