Haskell variant for day seven

day-07-haskell/.gitignore

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+.stack-work/
+*~

day-07-haskell/Setup.hs

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+import Distribution.Simple
+main = defaultMain

day-07-haskell/app/Main.hs

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+module Main (main) where
+
+import System.Environment.Blank ( getArgs )
+import Common
+import Task1 (task1)
+import Task2 (task2)
+
+main :: IO ()
+main = do
+  args <- getArgs
+  case args of
+    ["1", file] -> do
+      equations <- readEquationsFromFile file
+      print $ task1 equations
+    ["2", file] -> do
+      equations <- readEquationsFromFile file
+      print $ task2 equations
+    _ -> error "Usage: <1|2> <input file>"
+
+readEquationsFromFile :: String -> IO [Equation]
+readEquationsFromFile file = do
+  content <- readFile file
+  return $ map parseLine $ lines content
+
+parseLine :: String -> Equation
+parseLine line = fromWords $ words line
+  where
+    fromWords :: [String] -> Equation
+    fromWords (firstWord:args) = (read $ reverse $ dropFirst $ reverse firstWord, map read args)
+      where
+        dropFirst :: String -> String
+        dropFirst (_:xs) = xs
+        dropFirst x = x
+    fromWords parts = error $ "Illegal line: " ++ unwords parts
+

day-07-haskell/day07-haskell.cabal

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+cabal-version: 2.2
+
+-- This file has been generated from package.yaml by hpack version 0.37.0.
+--
+-- see: https://github.com/sol/hpack
+
+name:           day07-haskell
+version:        0.1.0.0
+homepage:       https://github.com/githubuser/day07-haskell#readme
+bug-reports:    https://github.com/githubuser/day07-haskell/issues
+author:         Author name here
+maintainer:     example@example.com
+copyright:      2024 Author name here
+license:        BSD-3-Clause
+build-type:     Simple
+
+source-repository head
+  type: git
+  location: https://github.com/githubuser/day07-haskell
+
+library
+  exposed-modules:
+      Common
+      Lib
+      Task1
+      Task2
+  hs-source-dirs:
+      src
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints
+  build-depends:
+      base >=4.7 && <5
+  default-language: Haskell2010
+
+executable day07-haskell-exe
+  main-is: Main.hs
+  hs-source-dirs:
+      app
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base >=4.7 && <5
+    , day07-haskell
+  default-language: Haskell2010
+
+test-suite day07-haskell-test
+  type: exitcode-stdio-1.0
+  main-is: Spec.hs
+  hs-source-dirs:
+      test
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base >=4.7 && <5
+    , day07-haskell
+  default-language: Haskell2010

day-07-haskell/package.yaml

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+name:                day07-haskell
+version:             0.1.0.0
+github:              "githubuser/day07-haskell"
+license:             BSD-3-Clause
+author:              "Author name here"
+maintainer:          "example@example.com"
+copyright:           "2024 Author name here"
+spec-version:        0.36.0
+
+dependencies:
+- base >= 4.7 && < 5
+
+ghc-options:
+- -Wall
+- -Wcompat
+- -Widentities
+- -Wincomplete-record-updates
+- -Wincomplete-uni-patterns
+- -Wmissing-export-lists
+- -Wmissing-home-modules
+- -Wpartial-fields
+- -Wredundant-constraints
+
+library:
+  source-dirs: src
+
+executables:
+  day07-haskell-exe:
+    main:                Main.hs
+    source-dirs:         app
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - day07-haskell
+
+tests:
+  day07-haskell-test:
+    main:                Spec.hs
+    source-dirs:         test
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - day07-haskell

day-07-haskell/src/Common.hs

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+module Common (Equation) where
+
+type Equation = (Int, [Int])

day-07-haskell/src/Lib.hs

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+module Lib
+    ( someFunc
+    ) where
+
+someFunc :: IO ()
+someFunc = putStrLn "someFunc"

day-07-haskell/src/Task1.hs

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+module Task1 (task1) where
+
+import Common
+
+task1 :: [Equation] -> Int
+task1 equations = sum $ map processEquation equations
+
+processEquation :: Equation -> Int
+processEquation (result, params) =
+  if brute (reverse params) result
+  then result
+  else 0
+  where
+    brute :: [Int] -> Int -> Bool
+    brute [] _ = False
+    brute [param] subResult = subResult == param
+    brute (param:subParams) subResult
+      | brute subParams $ subResult - param = True
+      | subResult `mod` param == 0 && brute subParams (subResult `div` param) = True
+      | otherwise = False

day-07-haskell/src/Task2.hs

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+module Task2 (task2, unconcat, unconcatStrings) where
+
+import Common
+import Data.List (isSuffixOf)
+
+task2 :: [Equation] -> Int
+task2 equations = sum $ map processEquation equations
+
+processEquation :: Equation -> Int
+processEquation (result, params) =
+  if brute (reverse params) result
+  then result
+  else 0
+  where
+    brute :: [Int] -> Int -> Bool
+    brute [] _ = False
+    brute [param] subResult = subResult == param
+    brute (param:subParams) subResult
+      | brute subParams $ subResult - param = True
+      | subResult `mod` param == 0 && brute subParams (subResult `div` param) = True
+      | otherwise = case unconcat subResult param of
+        Nothing -> False
+        Just rest -> brute subParams rest
+
+unconcat :: Int -> Int -> Maybe Int
+unconcat result suffix = do
+  rest <- unconcatStrings (show result) (show suffix)
+  Just $ read rest
+
+unconcatStrings :: String -> String -> Maybe String
+unconcatStrings sResult sSuffix
+  | sSuffix == sResult = Nothing
+  | sSuffix `isSuffixOf` sResult = Just $ take ((length sResult) - (length sSuffix)) sResult
+  | otherwise = Nothing

day-07-haskell/stack.yaml

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+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# https://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# A 'specific' Stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# snapshot: lts-22.28
+# snapshot: nightly-2024-07-05
+# snapshot: ghc-9.6.6
+#
+# The location of a snapshot can be provided as a file or url. Stack assumes
+# a snapshot provided as a file might change, whereas a url resource does not.
+#
+# snapshot: ./custom-snapshot.yaml
+# snapshot: https://example.com/snapshots/2024-01-01.yaml
+snapshot:
+  url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/43.yaml
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+#   subdirs:
+#   - auto-update
+#   - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the snapshot.
+# These entries can reference officially published versions as well as
+# forks / in-progress versions pinned to a git hash. For example:
+#
+# extra-deps:
+# - acme-missiles-0.3
+# - git: https://github.com/commercialhaskell/stack.git
+#   commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#
+# extra-deps: []
+
+# Override default flag values for project packages and extra-deps
+# flags: {}
+
+# Extra package databases containing global packages
+# extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of Stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=3.1"
+#
+# Override the architecture used by Stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by Stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor

day-07-haskell/stack.yaml.lock

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+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages: []
+snapshots:
+- completed:
+    sha256: 08bd13ce621b41a8f5e51456b38d5b46d7783ce114a50ab604d6bbab0d002146
+    size: 720271
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/43.yaml
+  original:
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/43.yaml

day-07-haskell/test/Spec.hs

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+main :: IO ()
+main = putStrLn "Test suite not yet implemented"