day 1

day1/CHANGELOG.md

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+# Revision history for day1
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.

day1/LICENSE

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+Copyright (c) 2026 radumaco
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

day1/app/Main.hs

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+module Main (main) where
+
+import System.Environment
+
+main :: IO ()
+main = do
+    path <- getArgs
+    file <- readFile $ path !! 0
+    let instructions = map  parseInput $ lines file
+    let result = foldl rotate (0, 50) instructions 
+    print result
+
+parseInput :: String -> (Rotation, Int)
+parseInput (dir:num) = (getRotation dir, read num)
+parseInput _ = error "Invalid Input"
+
+data Rotation = LEFT | RIGHT deriving (Show)
+
+getRotation :: Char -> Rotation
+getRotation 'L' = LEFT
+getRotation 'R' = RIGHT
+getRotation _ = error "Invalid Rotation"
+
+
+rotate :: (Int, Int) -> (Rotation, Int) -> (Int, Int)
+rotate (acc, pos) (RIGHT, num) = ((pos + num) `div` 100 + acc, (pos + num) `mod` 100)
+rotate (acc, pos) (LEFT, num) = let totalPos = pos - num 
+                                    offset = if pos == 0 then -1 else 0 in
+    case totalPos `mod` 100 of
+        0 -> (abs (totalPos `div` 100) + acc + 1 + offset, 0)
+        newPos -> (abs (totalPos `div` 100) + acc + offset, newPos)

day1/app/test-input1.txt

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+L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82

day1/day1.cabal

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+cabal-version:      3.14
+-- The cabal-version field refers to the version of the .cabal specification,
+-- and can be different from the cabal-install (the tool) version and the
+-- Cabal (the library) version you are using. As such, the Cabal (the library)
+-- version used must be equal or greater than the version stated in this field.
+-- Starting from the specification version 2.2, the cabal-version field must be
+-- the first thing in the cabal file.
+
+-- Initial package description 'day1' generated by
+-- 'cabal init'. For further documentation, see:
+--   http://haskell.org/cabal/users-guide/
+--
+-- The name of the package.
+name:               day1
+
+-- The package version.
+-- See the Haskell package versioning policy (PVP) for standards
+-- guiding when and how versions should be incremented.
+-- https://pvp.haskell.org
+-- PVP summary:     +-+------- breaking API changes
+--                  | | +----- non-breaking API additions
+--                  | | | +--- code changes with no API change
+version:            0.1.0.0
+
+-- A short (one-line) description of the package.
+-- synopsis:
+
+-- A longer description of the package.
+-- description:
+
+-- The license under which the package is released.
+license:            MIT
+
+-- The file containing the license text.
+license-file:       LICENSE
+
+-- The package author(s).
+author:             radumaco
+
+-- An email address to which users can send suggestions, bug reports, and patches.
+maintainer:         rmacocian@yahoo.com
+
+-- A copyright notice.
+-- copyright:
+build-type:         Simple
+
+-- Extra doc files to be distributed with the package, such as a CHANGELOG or a README.
+extra-doc-files:    CHANGELOG.md
+
+-- Extra source files to be distributed with the package, such as examples, or a tutorial module.
+-- extra-source-files:
+
+common warnings
+    ghc-options: -Wall
+
+executable day1
+    -- Import common warning flags.
+    import:           warnings
+
+    -- .hs or .lhs file containing the Main module.
+    main-is:          Main.hs
+
+    -- Modules included in this executable, other than Main.
+    -- other-modules:
+
+    -- LANGUAGE extensions used by modules in this package.
+    -- other-extensions:
+
+    -- Other library packages from which modules are imported.
+    build-depends:    base ^>=4.22.0.0
+
+    -- Directories containing source files.
+    hs-source-dirs:   app
+
+    -- Base language which the package is written in.
+    default-language: GHC2024