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author | Julien Dessaux | 2023-03-20 00:35:17 +0100 |
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committer | Julien Dessaux | 2023-03-20 00:35:17 +0100 |
commit | f5eb3e1a98d7ec0aea08bc640ec341178d4750e6 (patch) | |
tree | bc58bf14f1ac70fd14eccb2a5ff4f411bda9b92c /2020/10-Adapter_Array/second.hs | |
parent | small style fixes (diff) | |
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2020-10 in haskell
Diffstat (limited to '2020/10-Adapter_Array/second.hs')
-rw-r--r-- | 2020/10-Adapter_Array/second.hs | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/2020/10-Adapter_Array/second.hs b/2020/10-Adapter_Array/second.hs new file mode 100644 index 0000000..cb99e9a --- /dev/null +++ b/2020/10-Adapter_Array/second.hs @@ -0,0 +1,29 @@ +module Main (main) where +import Control.Monad (when) +import Data.List (group, sort) +import System.Exit (die) + +exampleExpectedOutput = 8 +exampleExpectedOutput2 = 19208 + +parseInput :: String -> IO [Int] +parseInput filename = do + input <- readFile filename + return $ map read $ lines input + +compute :: [Int] -> Int +compute jolts = product $ map (([0, 1, 2, 4, 7] !!) . length) $ filter ((==) 1 . head) $ group $ zipWith (-) s (0 : s) + where + s = sort jolts + +main :: IO () +main = do + example <- parseInput "example" + let s = sort example + let exampleOutput = compute example + when (exampleOutput /= exampleExpectedOutput) (die $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput) + example2 <- parseInput "example2" + let exampleOutput2 = compute example2 + when (exampleOutput2 /= exampleExpectedOutput2) (die $ "example2 failed: got " ++ show exampleOutput2 ++ " instead of " ++ show exampleExpectedOutput2) + input <- parseInput "input" + print $ compute input |