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authorTom Smeding <tom.smeding@gmail.com>2020-12-13 20:43:59 +0100
committerTom Smeding <tom.smeding@gmail.com>2020-12-13 20:43:59 +0100
commit3ca5033e1ddd578dd5c6a3b0e8488751c879f10b (patch)
treedab29a44e6c223cb36a51655cb23ba4a57ae95b2 /2020
parent1c971d7bbe17e716cfd58d0ae19a348142fb299c (diff)
Day 9
Diffstat (limited to '2020')
-rw-r--r--2020/9.hs40
-rw-r--r--2020/9.in1000
2 files changed, 1040 insertions, 0 deletions
diff --git a/2020/9.hs b/2020/9.hs
new file mode 100644
index 0000000..d593681
--- /dev/null
+++ b/2020/9.hs
@@ -0,0 +1,40 @@
+module Main where
+
+import Data.List (find)
+import Data.Maybe (fromJust)
+import qualified Data.Set as Set
+import qualified Data.Map.Strict as Map
+import Data.Map.Strict (Map)
+
+import Input
+
+
+preludeLen :: Int
+preludeLen = 25
+
+findRun :: Int -> [Int] -> (Int, Int)
+findRun target input = go input 0 0 mempty
+ where
+ go :: [Int] -> Int -> Int -> Map Int Int -> (Int, Int)
+ go (x:xs) index beforeTotal prevs
+ | Just index' <- Map.lookup (beforeTotal + x - target) prevs
+ , index - index' >= 2
+ = (index', index)
+ | otherwise
+ = go xs (index + 1) (beforeTotal + x) (Map.insert (beforeTotal + x) index prevs)
+ go [] _ _ _ = error "Run not found"
+
+main :: IO ()
+main = do
+ input <- map read <$> getInput 9 :: IO [Int]
+ let (prelude, rest) = splitAt preludeLen input
+ sets = scanl (\s (i1, i2) -> Set.insert i2 (Set.delete i1 s))
+ (Set.fromList prelude)
+ (zip input rest)
+ isValid s i = any (`Set.member` s) [i - n | n <- Set.toList s, n /= i - n]
+ weakness = snd (fromJust (find (not . uncurry isValid) (zip sets rest)))
+ print weakness
+
+ let (index1, index2) = findRun weakness input
+ run = drop (index1 + 1) (take index2 input)
+ print (minimum run + maximum run)
diff --git a/2020/9.in b/2020/9.in
new file mode 100644
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--- /dev/null
+++ b/2020/9.in
@@ -0,0 +1,1000 @@
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