2023-05 in haskell

2023/05-If_You_Give_A_Seed_A_Fertilizer/example

@@ -0,0 +1,33 @@
+seeds: 79 14 55 13
+
+seed-to-soil map:
+50 98 2
+52 50 48
+
+soil-to-fertilizer map:
+0 15 37
+37 52 2
+39 0 15
+
+fertilizer-to-water map:
+49 53 8
+0 11 42
+42 0 7
+57 7 4
+
+water-to-light map:
+88 18 7
+18 25 70
+
+light-to-temperature map:
+45 77 23
+81 45 19
+68 64 13
+
+temperature-to-humidity map:
+0 69 1
+1 0 69
+
+humidity-to-location map:
+60 56 37
+56 93 4

2023/05-If_You_Give_A_Seed_A_Fertilizer/first.hs

@@ -0,0 +1,65 @@
+-- requires cabal install --lib megaparsec parser-combinators
+module Main (main) where
+
+import Control.Applicative.Permutations
+import Control.Monad (void, when)
+import Data.Char qualified as C
+import Data.Either
+import Data.List qualified as L
+import Data.Map qualified as M
+import Data.Maybe
+import Data.Set qualified as S
+import Data.Void (Void)
+import Text.Megaparsec
+import Text.Megaparsec.Char
+
+exampleExpectedOutput = 35
+
+data Map = Map Int Int Int deriving Show -- destination source range
+data Mapping = Mapping String String [Map] deriving Show -- sourceStr destStr
+data Input = Input [Int] [Mapping] deriving Show -- seeds mappings
+
+type Parser = Parsec Void String
+
+parseNumber :: Parser Int
+parseNumber = read <$> some digitChar <* many (char ' ')
+
+parseMap :: Parser Map
+parseMap = Map <$> parseNumber
+               <*> parseNumber
+               <*> parseNumber <* eol
+
+parseMapping :: Parser Mapping
+parseMapping = Mapping <$> (some letterChar <* string "-to-")
+                       <*> (some letterChar <* string " map:" <* eol)
+                       <*> some parseMap <* optional eol
+
+parseInput' :: Parser Input
+parseInput' = Input <$> (string "seeds: " *> some parseNumber <* some eol)
+                    <*> some parseMapping <* eof
+
+parseInput :: String -> IO Input
+parseInput filename = do
+  input <- readFile filename
+  case runParser parseInput' filename input of
+    Left bundle -> error $ errorBundlePretty bundle
+    Right input' -> return input'
+
+step :: [Map] -> Int -> Int
+step [] n = n
+step (Map dest src range:ms) n | n>=src && n<src+range = n - src + dest
+                               | otherwise = step ms n
+
+stepMapping :: [Int] -> Mapping -> [Int]
+stepMapping values (Mapping _ _ ms) = map (step ms) values
+
+compute :: Input -> Int
+compute (Input values mappings) = minimum $ L.foldl' stepMapping values mappings
+
+main :: IO ()
+main = do
+  example <- parseInput "example"
+  let exampleOutput = compute example
+  when  (exampleOutput /= exampleExpectedOutput)  (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput)
+  input <- parseInput "input"
+  print $ compute input

2023/05-If_You_Give_A_Seed_A_Fertilizer/input

@@ -0,0 +1,243 @@
+seeds: 1514493331 295250933 3793791524 105394212 828589016 654882197 658370118 49359719 4055197159 59237418 314462259 268880047 2249227634 74967914 2370414906 38444198 3291001718 85800943 2102534948 5923540
+
+seed-to-soil map:
+3352941879 1247490906 129850502
+1738919961 2189748071 56658550
+1795578511 292133467 518088747
+1519757661 1666834550 130335907
+1650093568 133993362 88826393
+2813914030 2262539545 40894545
+2698412916 2661705133 115501114
+2854808575 810222214 437268692
+410530961 1545057218 121777332
+0 242661076 10731898
+532308293 2303434090 61476099
+3292077267 1797170457 2282798
+2313667258 0 133993362
+2447660620 2410952837 250752296
+3294360065 253392974 38740493
+10731898 1377341408 167715810
+1457582089 2364910189 46042648
+593784392 3009289500 824592362
+3333100558 222819755 19841321
+1418376754 1799453255 39205335
+1503624737 2246406621 16132924
+178447708 2777206247 232083253
+3482792381 1838658590 351089481
+
+soil-to-fertilizer map:
+3513795976 4258851234 36116062
+3393453635 4148223693 110627541
+3504081176 3494735450 6350258
+2671742993 3596285367 235915393
+991290653 256764866 25867175
+2907658386 3330719253 68855819
+3336496635 4091266693 56957000
+3161141476 2536943456 80523019
+1961696534 304660310 29551079
+812996514 1560772632 178294139
+1562163347 2321959023 78904062
+31289107 1039870587 339682886
+1520029818 1928417376 42133529
+3510431434 3832200760 3364542
+3549912038 3272523584 58195669
+0 149071717 31289107
+3608107707 3501085708 5732766
+503523937 1739066771 189350605
+3071674583 3506818474 89466893
+3241664495 3996434553 94832140
+1708133363 454333361 253563171
+3813493721 3097084118 175439466
+1991247613 1970550905 351408118
+3613840473 2897430870 199653248
+2536943456 2762631333 134799537
+1641067409 244319429 12445437
+3994753216 3913095788 83338765
+2976514205 3399575072 95160378
+1354883134 0 143118415
+1349131883 2400863085 5751251
+1498001549 282632041 22028269
+2342655731 180360824 63958605
+370971993 1379553473 126598642
+4149802438 2617466475 145164858
+1017157828 707896532 331974055
+692874542 334211389 120121972
+497570635 143118415 5953302
+3988933187 3907275759 5820029
+4078091981 3835565302 71710457
+1653512846 1506152115 54620517
+
+fertilizer-to-water map:
+3053686523 2028998994 1241280773
+1492748555 1562401968 269616514
+554432178 1000324407 562077561
+2944878746 3270279767 108807777
+2501520804 3379087544 52288887
+1762365069 20686928 69653413
+2028998994 3431376431 472521810
+1431309984 814973200 3653900
+409832614 0 20686928
+430519542 818627100 123912636
+1116509739 500172955 314800245
+2553809691 3903898241 391069055
+0 90340341 409832614
+1434963884 942539736 57784671
+
+water-to-light map:
+2774754469 1598606098 15160294
+3832622498 1469118874 129487224
+4125818569 3997047227 169148727
+1108418694 1130695768 196125912
+637654660 517892123 26551592
+2519230072 3399515763 135968347
+2751000257 3126996880 23754212
+861800165 884077239 88532605
+1469118874 2566660966 63929427
+2789914763 3150751092 63425583
+2853340346 2561960449 4700517
+1692681911 3397592997 1922766
+2858040863 1773257241 287341147
+2655198419 2851614649 15098309
+950332770 972609844 158085924
+591049922 471287385 46604738
+3482333989 3849276196 108901632
+1694604677 1613766392 159490849
+3591235621 3958177828 38869399
+3630105020 4166195954 128771342
+3205039781 3535484110 277294208
+2706794606 2060598388 44205651
+386607659 544443715 110595292
+3962109722 2540862463 21097986
+697311924 0 92263281
+558450415 404456802 11447837
+2409200012 3214176675 110030060
+569898252 862925569 21151670
+1354525884 415904639 55382746
+789575205 790700609 72224960
+3832262624 2690248164 359874
+163757080 181606223 222850579
+1533048301 2967363270 159633610
+497202951 784452458 6248151
+2670296728 3812778318 36497878
+3145382010 2630590393 59657771
+1854095526 2104804039 436058424
+0 655039007 74414138
+2390804262 2690608038 18395750
+1304544606 1326821680 49981278
+3758876362 3324206735 73386262
+664206252 1376802958 33105672
+74414138 92263281 89342942
+3983207708 2709003788 142610861
+503451102 729453145 54999313
+2290153950 2866712958 100650312
+
+light-to-temperature map:
+2054128675 422374783 216418447
+3729049939 3132111492 565917357
+524183620 1261361039 34450583
+723901655 638793230 74616934
+304496246 795175951 115896188
+1128506994 1008723417 50927515
+958650763 2074746732 3056214
+0 1224918384 36442655
+558634203 1059650932 165267452
+2052385426 713410164 1743249
+833053864 1953862956 120883776
+36442655 715153413 80022538
+1455705971 1506174459 386316618
+1842022589 1295811622 210362837
+2270547122 2077802946 24477429
+116465193 2102280375 188031053
+1179434509 945607414 63116003
+798518589 911072139 34535275
+3373647615 3893335786 195498774
+3696979816 3698028849 32070123
+1242550512 1892491077 43410067
+3051130577 2566857633 322517038
+3002478931 3844684140 48651646
+2311039190 3730098972 114585168
+2425624358 2311039190 187630064
+2819387158 2889374671 183091773
+1285960579 103791186 85466201
+1371426780 338095592 84279191
+1110545182 1935901144 17961812
+953937640 2290311428 4713123
+420392434 0 103791186
+961706977 189257387 148838205
+3637334768 3072466444 59645048
+3569146389 2498669254 68188379
+2613254422 4088834560 206132736
+
+temperature-to-humidity map:
+2032423062 2486277941 26281270
+333062067 2316624216 6051173
+1716048249 1385455997 91409968
+460397469 2512559211 69041956
+25538975 668468772 15388105
+2090913379 324344034 71221218
+2804805674 3018690414 130533369
+529439425 908821722 476634275
+1106765273 448560048 219908724
+2162134597 1476865965 445565302
+0 395565252 25538975
+4004204691 4019550481 43244121
+2058704332 0 32209047
+1516375281 2116951248 199672968
+3888833667 2764269134 115371024
+40927080 32209047 292134987
+1490276549 2581601167 26098732
+1360818538 2322675389 129458011
+1006073700 2043715496 73235752
+1079309452 421104227 27455821
+1807458217 683856877 224964845
+339113240 1922431267 121284229
+4155917040 2879640158 139050256
+2764269134 4171262830 40536540
+4047448812 4062794602 108468228
+2935339043 3149223783 870326698
+1326673997 2452133400 34144541
+3805665741 4211799370 83167926
+
+humidity-to-location map:
+3928575650 3147563455 98804874
+2357899446 2418187254 26586982
+449562184 2261875136 59054833
+308294839 60287808 141267345
+1872062279 1591999301 10857495
+1227084719 574109504 259895254
+1980177059 1765508840 13399403
+1162615704 1941046629 64469015
+2384486428 2654234915 114059261
+702311863 1515542756 40659242
+1993576462 2005515644 256359492
+3047301127 3246368329 27789688
+650396000 1713592977 51915863
+3701335066 3862068622 181049310
+1122863338 1673840611 39752366
+3075090815 4174917460 120049836
+3882384376 2778717800 46191274
+1626219043 201555153 245843236
+4027380524 3325898523 267586772
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+3281454033 2925002624 18592540
+110359150 1556201998 35797303
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+508617017 834004758 141778983
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+0 463750354 110359150
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+3671514971 3296078428 29820095
+2498545689 0 60287808
+3431846101 2911222456 13780168
+1882919774 2320929969 97257285

2023/05-If_You_Give_A_Seed_A_Fertilizer/second.hs

@@ -0,0 +1,71 @@
+-- requires cabal install --lib megaparsec parser-combinators
+module Main (main) where
+
+import Control.Applicative.Permutations
+import Control.Monad (void, when)
+import Data.Char qualified as C
+import Data.Either
+import Data.List qualified as L
+import Data.Map qualified as M
+import Data.Maybe
+import Data.Set qualified as S
+import Data.Void (Void)
+import Text.Megaparsec
+import Text.Megaparsec.Char
+
+exampleExpectedOutput = 46
+
+data Range = Range Int Int deriving Show -- start range
+data Map = Map Int Range deriving Show -- destination range
+data Mapping = Mapping String String [Map] deriving Show -- sourceStr destStr
+data Input = Input [Range] [Mapping] deriving Show -- seeds mappings
+
+type Parser = Parsec Void String
+
+parseNumber :: Parser Int
+parseNumber = read <$> some digitChar <* many (char ' ')
+
+parseRange :: Parser Range
+parseRange = Range <$> parseNumber
+                   <*> parseNumber
+
+parseMap :: Parser Map
+parseMap = Map <$> parseNumber
+               <*> parseRange <* eol
+
+parseMapping :: Parser Mapping
+parseMapping = Mapping <$> (some letterChar <* string "-to-")
+                       <*> (some letterChar <* string " map:" <* eol)
+                       <*> some parseMap <* optional eol
+
+parseInput' :: Parser Input
+parseInput' = Input <$> (string "seeds: " *> some parseRange <* some eol)
+                    <*> some parseMapping <* eof
+
+parseInput :: String -> IO Input
+parseInput filename = do
+  input <- readFile filename
+  case runParser parseInput' filename input of
+    Left bundle -> error $ errorBundlePretty bundle
+    Right input' -> return input'
+
+step :: [Map] -> Range -> [Range]
+step [] n = [n]
+step (Map dest (Range src range):ms) r@(Range n l) | n+l<=src || n>=src+range = step ms r
+                                                   | n>=src && n+l<=src+range = [Range (n-src+dest) l]
+                                                   | n>=src = Range (n-src+dest) (range+src-n) : step ms (Range (src+range) (l-range-src+n))
+                                                   | otherwise = Range dest (l-src+n) : step ms (Range n (src-n))
+
+stepMapping :: [Range] -> Mapping -> [Range]
+stepMapping ranges (Mapping _ _ ms) = concatMap (step ms) ranges
+
+compute :: Input -> Int
+compute (Input ranges mappings) = minimum $ map (\(Range start _) -> start) $ L.foldl' stepMapping ranges mappings
+
+main :: IO ()
+main = do
+  example <- parseInput "example"
+  let exampleOutput = compute example
+  when  (exampleOutput /= exampleExpectedOutput)  (error $ "example failed: got " ++ show exampleOutput ++ " instead of " ++ show exampleExpectedOutput)
+  input <- parseInput "input"
+  print $ compute input