74 lines
2.5 KiB
Haskell
Executable File
74 lines
2.5 KiB
Haskell
Executable File
#! /usr/bin/env -S"ANSWER=42" nix-shell
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#! nix-shell -p ghcid
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#! nix-shell -p "haskellPackages.ghcWithPackages (p: with p; [pretty-simple])"
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#! nix-shell -i "ghcid -c 'ghci' -T main"
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{-# OPTIONS_GHC -Wall -Wincomplete-uni-patterns #-}
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{-# OPTIONS_GHC -Wno-unused-top-binds -Wno-unused-imports #-}
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{-# OPTIONS_GHC -Wno-unused-matches #-}
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{-# LANGUAGE OverloadedStrings #-}
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import Debug.Trace (trace)
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import Text.Pretty.Simple
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import Data.IntMap.Strict (IntMap)
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import qualified Data.IntMap.Strict as I
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import Data.Maybe (fromMaybe)
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import Data.List (iterate')
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exampleInput1 :: [Int]
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exampleInput1 = [0,3,6]
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exampleInput2 :: [Int]
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exampleInput2 = [1,3,2]
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exampleInput3 :: [Int]
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exampleInput3 = [3,1,2]
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input :: [Int]
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input = [0,3,1,6,7,5]
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type Turn = Int
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type Number = Int
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-- Each Number is attached to the last Turn it was seen
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-- The current Turn is recorded too
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-- Last spoken Number is recorded too
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data Game = Game { unMem :: (IntMap Turn)
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, unTurn :: Turn
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, unNumber :: Number
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}
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deriving Show
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initGame :: [Int] -> Game
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initGame keys = Game mem ((length keys) + 1) 0
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where
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mem = I.fromList (zip keys [1..])
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next :: Game -> Game
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next (Game mem turn n) = fromMaybe (Game (I.insert n turn mem) (turn+1) 0) $ do
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lastTurn <- I.lookup n mem
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pure $ Game (I.insert n turn mem) (turn+1) (turn - lastTurn)
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main :: IO ()
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main = do
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putStrLn ":: Day 15 - Tests 1"
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print exampleInput1
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putStrLn $ "turn 04: " <> (show $ initGame exampleInput1)
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putStrLn $ "turn 05: " <> (show $ next $ initGame exampleInput1)
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putStrLn $ "turn 06: " <> (show $ next $ next $ initGame exampleInput1)
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putStrLn $ "turn 07: " <> (show $ next $ next $ next $ initGame exampleInput1)
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putStrLn $ "turn 08: " <> (show $ next $ next $ next $ next $ initGame exampleInput1)
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putStrLn $ "turn 09: " <> (show $ next $ next $ next $ next $ next $ initGame exampleInput1)
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putStrLn $ "turn 10: " <> (show $ next $ next $ next $ next $ next $ next $ initGame exampleInput1)
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print $ last $ take 2017 $ map unNumber $ iterate next $ initGame exampleInput1
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print $ last $ take 2017 $ map unNumber $ iterate next $ initGame exampleInput2
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print $ last $ take 2017 $ map unNumber $ iterate next $ initGame exampleInput3
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putStrLn ":: Day 15 - Part 1"
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print $ last $ take (2020 - 6) $ map unNumber $ iterate next $ initGame input
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putStrLn ":: Day 15 - Part 2"
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-- print $ last $ take (30000000 - 3) $ map unNumber $ iterate' next $ initGame exampleInput1
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print $ last $ take (30000000 - 6) $ map unNumber $ iterate' next $ initGame input
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