day1

.gitignore

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+# haskell
+dist-newstyle
+.stack-work/
+*~
+
+# rust
+build
+
+# misc
+.DS_Store

Justfile

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+all:
+  just day1
+
+day1:
+  stack run --package day1

README.md

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+# adventofcode2024

cabal.project

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+packages: */*.cabal

day1/app/Main.hs

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+module Main (main) where
+
+import Data.List (sort, transpose)
+import Text.Printf (printf)
+
+-- readFile "./inputs/day1" >>= \inputs -> let columns = map sort $ map (map (read :: String -> Int)) $ transpose $ map words $ lines inputs in printf "total distance: %d\n" (sum $ map abs $ zipWith (-) (columns !! 0) (columns !! 1)) >> printf "similarity score: %d\n" (sum $ map (\x -> x * (length $ filter (\y -> x == y) (columns !! 1))) (columns !! 0))
+
+main :: IO ()
+main = do
+  inputs <- readFile "./inputs/day1"
+  let columns = map sort $ map (map (read :: String -> Int)) $ transpose $ map words $ lines inputs
+
+  printf "total distance: %d\n" (sum $ map abs $ zipWith (-) (columns !! 0) (columns !! 1))
+  printf "similarity score: %d\n" (sum $ map (\x -> x * (length $ filter (\y -> x == y) (columns !! 1))) (columns !! 0))

day1/day1.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:           day1
+version:        0.1.0.0
+description:    Please see the README on GitHub at <https://github.com/githubuser/day1#readme>
+homepage:       https://github.com/githubuser/day1#readme
+bug-reports:    https://github.com/githubuser/day1/issues
+author:         Author name here
+maintainer:     example@example.com
+copyright:      2024 Author name here
+license:        MIT
+build-type:     Simple
+
+source-repository head
+  type: git
+  location: https://github.com/githubuser/day1
+
+executable day1
+  main-is: Main.hs
+  other-modules:
+      Paths_day1
+  autogen-modules:
+      Paths_day1
+  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
+  default-language: Haskell2010

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:
+- day1
+# 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

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