From 8f579d529a51da7408f9286c4ed24f1c75dda6df Mon Sep 17 00:00:00 2001 From: Hans Goor Date: Mon, 2 Dec 2024 17:13:15 +0100 Subject: [PATCH] Add solution to day 2. --- 2024/haskell/app/day2/Day2.hs | 47 ++ 2024/haskell/haskell.cabal | 16 +- 2024/haskell/package.yaml | 12 +- 2024/haskell/resources/day2.txt | 1000 +++++++++++++++++++++++ 2024/haskell/resources/day2_example.txt | 6 + 5 files changed, 1079 insertions(+), 2 deletions(-) create mode 100644 2024/haskell/app/day2/Day2.hs create mode 100644 2024/haskell/resources/day2.txt create mode 100644 2024/haskell/resources/day2_example.txt diff --git a/2024/haskell/app/day2/Day2.hs b/2024/haskell/app/day2/Day2.hs new file mode 100644 index 0000000..ee9e450 --- /dev/null +++ b/2024/haskell/app/day2/Day2.hs @@ -0,0 +1,47 @@ +module Main (main) where + +-- | Part 1 +type Report = [Int] + +grabReports :: String -> [Report] +grabReports = map (map (\x -> read x :: Int) . words) . lines + +isReportSafeWith :: (Int -> Int -> Bool) -> Report -> Bool +isReportSafeWith _ [] = True +isReportSafeWith _ [_] = True +isReportSafeWith f (x : y : xs) = f x y && isReportSafeWith f (y : xs) + +reportDecreasing :: Int -> Int -> Bool +reportDecreasing x y = 1 <= x - y && x - y <= 3 + +reportIncreasing :: Int -> Int -> Bool +reportIncreasing x y = 1 <= y - x && y - x <= 3 + +isReportSafe :: Report -> Bool +isReportSafe report = isReportSafeWith reportDecreasing report || isReportSafeWith reportIncreasing report + +part1 :: String -> IO () +part1 = print . length . filter isReportSafe . grabReports + +-- | Part 2 +removeItem :: Int -> Report -> Report +removeItem n report = removeItem' n report 0 + where + removeItem' :: Int -> Report -> Int -> Report + removeItem' _ [] _ = [] + removeItem' n' (r : rs) i + | n' == i = removeItem' n' rs (i + 1) + | otherwise = r : removeItem' n' rs (i + 1) + +reportPermutations :: Report -> [Report] +reportPermutations report = report : [removeItem i report | i <- [0 .. length report - 1]] + +isReportSafePerm :: Report -> Bool +isReportSafePerm report = any isReportSafe (reportPermutations report) + +part2 :: String -> IO () +part2 = print . length . filter isReportSafePerm . grabReports + +-- | Main +main :: IO () +main = readFile "resources/day2.txt" >>= part2 diff --git a/2024/haskell/haskell.cabal b/2024/haskell/haskell.cabal index 68b94b9..0a83581 100644 --- a/2024/haskell/haskell.cabal +++ b/2024/haskell/haskell.cabal @@ -37,7 +37,7 @@ library base >=4.7 && <5 default-language: Haskell2010 -executable aoc2024-day1 +executable day1 main-is: Day1.hs other-modules: Paths_haskell @@ -51,6 +51,20 @@ executable aoc2024-day1 , haskell default-language: Haskell2010 +executable day2 + main-is: Day2.hs + other-modules: + Paths_haskell + autogen-modules: + Paths_haskell + hs-source-dirs: + app/day2 + 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 + , haskell + default-language: Haskell2010 + test-suite haskell-test type: exitcode-stdio-1.0 main-is: Spec.hs diff --git a/2024/haskell/package.yaml b/2024/haskell/package.yaml index a671cb2..fd8cc06 100644 --- a/2024/haskell/package.yaml +++ b/2024/haskell/package.yaml @@ -37,7 +37,7 @@ library: source-dirs: src executables: - aoc2024-day1: + day1: main: Day1.hs source-dirs: app/day1 ghc-options: @@ -47,6 +47,16 @@ executables: dependencies: - haskell + day2: + main: Day2.hs + source-dirs: app/day2 + ghc-options: + - -threaded + - -rtsopts + - -with-rtsopts=-N + dependencies: + - haskell + tests: haskell-test: main: Spec.hs diff --git a/2024/haskell/resources/day2.txt b/2024/haskell/resources/day2.txt new file mode 100644 index 0000000..0164a32 --- /dev/null +++ b/2024/haskell/resources/day2.txt @@ -0,0 +1,1000 @@ +6 8 9 11 10 +13 16 19 22 24 25 25 +43 46 47 48 50 52 56 +55 57 60 61 64 65 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b/2024/haskell/resources/day2_example.txt new file mode 100644 index 0000000..b49c10d --- /dev/null +++ b/2024/haskell/resources/day2_example.txt @@ -0,0 +1,6 @@ +7 6 4 2 1 +1 2 7 8 9 +9 7 6 2 1 +1 3 2 4 5 +8 6 4 4 1 +1 3 6 7 9