37 lines
1.4 KiB
Haskell
37 lines
1.4 KiB
Haskell
module Part2 where
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import Commons
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import Data.Array (Array, array, (!), (//), assocs, listArray)
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type Lens = (String, Int)
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type Hashmap = Array Int [Lens]
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initHashmap :: Hashmap
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initHashmap = listArray (0, 255) [[] | _ <- [0..255]]
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applyInstructionToList :: [Lens] -> Instruction -> [Lens]
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applyInstructionToList [] i | iType i == Set = [(label i, focal i)]
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| otherwise = []
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applyInstructionToList ((l, f): t) i | iType i == Set && label i == l = (label i, focal i): t
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| iType i == Remove && label i == l = t
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| otherwise = (l, f): applyInstructionToList t i
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applyInstruction :: Hashmap -> Instruction -> Hashmap
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applyInstruction m i = let hash = getHash 0 (label i)
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in m // [(hash, applyInstructionToList (m ! hash) i)]
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applyInstructions :: [Instruction] -> Hashmap
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applyInstructions = foldl applyInstruction initHashmap
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getFocusingPowerFromList :: Int -> Int -> [Lens] -> [Int]
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getFocusingPowerFromList _ _ [] = []
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getFocusingPowerFromList i slot ((_, f): t) = i * slot * f: getFocusingPowerFromList i (slot + 1) t
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getFocusingPower :: Hashmap -> [Int]
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getFocusingPower = concatMap (\ (i, h) -> getFocusingPowerFromList (i + 1) 1 h) . assocs
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getAllFocusingPower :: [Instruction] -> [Int]
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getAllFocusingPower = getFocusingPower . applyInstructions
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