day01

day01/Setup.hs

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+import Distribution.Simple
+main = defaultMain

day01/data/input010.txt

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+1000
+2000
+3000
+
+4000
+
+5000
+6000
+
+7000
+8000
+9000
+
+10000

day01/day01.cabal

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+name:                day01
+version:             0.1.0.0
+-- synopsis:
+-- description:
+homepage:            https://github.com/githubuser/day01#readme
+license:             MIT
+license-file:        ../LICENSE
+author:              Author name here
+maintainer:          example@example.com
+copyright:           2022 Author name here
+category:            Web
+build-type:          Simple
+cabal-version:       >=1.10
+extra-source-files:  README.md
+                     CHANGELOG.md
+
+library
+  hs-source-dirs: src
+  exposed-modules:
+      Lib
+  other-modules:
+      Paths_day01
+  default-language:    Haskell2010
+  build-depends:       base >= 4.7 && < 5, split
+  ghc-options:         -Wall
+                       -Wcompat
+                       -Widentities
+                       -Wincomplete-record-updates
+                       -Wincomplete-uni-patterns
+                       -Wmissing-export-lists
+                       -Wmissing-home-modules
+                       -Wpartial-fields
+                       -Wredundant-constraints
+
+executable day011
+  hs-source-dirs:      src
+  main-is:             Main1.hs
+  other-modules:
+      Lib
+  default-language:    Haskell2010
+  build-depends:       base >= 4.7 && < 5, split, day01
+  ghc-options:         -Wall
+                       -Wcompat
+                       -Widentities
+                       -Wincomplete-record-updates
+                       -Wincomplete-uni-patterns
+                       -Wmissing-export-lists
+                       -Wmissing-home-modules
+                       -Wpartial-fields
+                       -Wredundant-constraints
+
+executable day012
+  hs-source-dirs:      src
+  main-is:             Main2.hs
+  other-modules:
+      Lib
+  default-language:    Haskell2010
+  build-depends:       base >= 4.7 && < 5, split, day01
+  ghc-options:         -Wall
+                       -Wcompat
+                       -Widentities
+                       -Wincomplete-record-updates
+                       -Wincomplete-uni-patterns
+                       -Wmissing-export-lists
+                       -Wmissing-home-modules
+                       -Wpartial-fields
+                       -Wredundant-constraints

day01/src/Lib.hs

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+module Lib (parseBackpacks) where
+    
+import Data.List.Split
+
+parseBackpacks :: String -> [[Int]]
+parseBackpacks input = [map read b | b <- splitOn [""] $ lines input]

day01/src/Main1.hs

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+module Main (main) where
+
+-- import Debug.Trace
+
+import Lib
+
+main :: IO ()
+main = do
+    input <- getContents
+    let backpacks = parseBackpacks input
+        max_backpack = maximum [sum b | b <- backpacks]
+    print $ max_backpack
+    return ()
+

day01/src/Main2.hs

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+module Main (main) where
+
+-- import Debug.Trace
+import Data.List (sort)
+
+import Lib
+
+main :: IO ()
+main = do
+    input <- getContents
+    let backpacks = parseBackpacks input
+        top_3 = sum $ take 3 $ reverse $ sort [sum b | b <- backpacks]
+    print $ top_3
+    return ()

day01/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/
+
+# Resolver to choose 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:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+#
+# 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.
+#
+# resolver: ./custom-snapshot.yaml
+# resolver: https://example.com/snapshots/2018-01-01.yaml
+resolver:
+  url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/2.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 resolver.
+# 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 local 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: ">=2.9"
+#
+# 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

day01/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: fc39d8afc97531d53d87b10abdef593bce503c0c1e46c2e9a84ebcbc78bf8470
+    size: 648432
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/2.yaml
+  original:
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/2.yaml