7 files changed, 1070 insertions, 3 deletions

diff --git a/aoc.cabal b/aoc.cabal
index 01cebc9..0957baa 100644
--- a/aoc.cabal
+++ b/aoc.cabal
@@ -69,3 +69,9 @@ executable Day08
   build-depends:       base, aoc, containers
   default-language:    Haskell2010
   hs-source-dirs:      execs
+
+executable Day09
+  main-is:             Day09.hs
+  build-depends:       base, aoc, containers, parsec
+  default-language:    Haskell2010
+  hs-source-dirs:      execs
diff --git a/default.nix b/default.nix
index 64861a5..78e9f1f 100644
--- a/default.nix
+++ b/default.nix
@@ -3,8 +3,9 @@ mkDerivation {
   pname = "aoc";
   version = "0.1.0.0";
   src = ./.;
-  isLibrary = false;
+  isLibrary = true;
   isExecutable = true;
+  libraryHaskellDepends = [ base ];
   executableHaskellDepends = [ base containers parsec ];
   license = "unknown";
   hydraPlatforms = stdenv.lib.platforms.none;
diff --git a/execs/Day08.hs b/execs/Day08.hs
index 7d3fce8..6546990 100644
--- a/execs/Day08.hs
+++ b/execs/Day08.hs
@@ -40,6 +40,6 @@ genAll (acc:rest) = map (acc:) $ genAll rest
 main :: IO ()
 main = do
     n <- map (parseLine . words) . lines <$> readFile "input/08"
-    let solve1 = run 0 0 Set.empty . Map.fromList . zip [0..] 
+    let solve1 = run 0 0 mempty . Map.fromList . zip [0..] 
     print $ solve1 n
-    print $ solve1 $ head $ filter (doesEnd 0 0 Set.empty . Map.fromList . zip [0..]) $ genAll n
+    print $ solve1 $ head $ filter (doesEnd 0 0 mempty . Map.fromList . zip [0..]) $ genAll n
diff --git a/execs/Day09.hs b/execs/Day09.hs
new file mode 100644
index 0000000..e2e5fd4
--- /dev/null
+++ b/execs/Day09.hs
@@ -0,0 +1,35 @@
+
+module Main where
+
+import Utils
+import Data.List (inits, tails, find)
+import Data.Bifunctor
+
+parseLine :: String -> Int
+parseLine = read
+
+doCheck :: [Int] -> Int -> Bool
+doCheck preamble target = target `elem` p
+    where p = [x + y | x <- preamble, y <- preamble, x /= y]
+
+checkAll :: [Int] -> [Int] -> [(Int, Bool)]
+checkAll preamble [x] = [(x, doCheck preamble x)]
+checkAll preamble@(p:ps) (x:xs) = (x, doCheck preamble x) : checkAll (ps++[x]) xs
+
+
+findWeakness :: [[Int]] -> Int -> Int
+findWeakness subs target = mn + mx
+    where Just t = find ((== target) . sum) subs
+          mn = minimum t
+          mx = maximum t
+ 
+main :: IO ()
+main = do
+    n <- map parseLine . lines <$> readFile "input/09"
+    let preambleLen = 25
+        Just (target, _) = find (not . snd) 
+            $ uncurry checkAll
+            $ bimap (take preambleLen) (drop preambleLen) 
+            $ (,) n n
+    print target
+    print $ findWeakness (sublists n) target
diff --git a/input/09 b/input/09
new file mode 100644
index 0000000..e8a2fe7
--- /dev/null
+++ b/input/09
@@ -0,0 +1,1000 @@
+29
+44
+11
+5
+42
+8
+17
+23
+18
+16
+50
+47
+21
+3
+25
+28
+36
+34
+48
+30
+32
+40
+22
+19
+41
+13
+56
+14
+11
+20
+39
+43
+17
+64
+57
+66
+31
+16
+106
+27
+79
+25
+36
+24
+46
+38
+28
+33
+92
+29
+30
+34
+89
+35
+53
+83
+42
+40
+137
+41
+50
+43
+68
+49
+69
+52
+79
+60
+54
+62
+165
+57
+87
+102
+95
+110
+114
+75
+76
+239
+81
+94
+176
+84
+163
+92
+119
+173
+143
+167
+106
+111
+116
+197
+132
+133
+194
+151
+156
+157
+159
+160
+313
+165
+175
+249
+178
+240
+176
+269
+198
+217
+286
+310
+227
+424
+289
+273
+434
+265
+393
+332
+415
+337
+444
+530
+325
+340
+341
+351
+354
+451
+374
+403
+492
+649
+922
+500
+537
+516
+538
+554
+590
+639
+597
+825
+867
+662
+665
+666
+841
+676
+1113
+715
+705
+957
+777
+1242
+1134
+1016
+1037
+1038
+1328
+1054
+1155
+1092
+1144
+1187
+1236
+1312
+1327
+1799
+1623
+1331
+1342
+1381
+2518
+1420
+1482
+1662
+2049
+1814
+2419
+2146
+2404
+3382
+2342
+2209
+2247
+3141
+2236
+3296
+2563
+2567
+2654
+4727
+2673
+2712
+2863
+2723
+2801
+4050
+3469
+3144
+6270
+5287
+3960
+4456
+4355
+4445
+4483
+4551
+5236
+7099
+5099
+5217
+9278
+6142
+8568
+5327
+5385
+5396
+8540
+5524
+5867
+5945
+8996
+9196
+7104
+8315
+12316
+8405
+9681
+8800
+8928
+9034
+11341
+10316
+12203
+10909
+10544
+10712
+10723
+10781
+10851
+10920
+11263
+14979
+11391
+11812
+18609
+18445
+15419
+17827
+17205
+17333
+17439
+17962
+17834
+19244
+19350
+20860
+21028
+31447
+29956
+35796
+21504
+30270
+22732
+23203
+22183
+35273
+47289
+26810
+27231
+32858
+40566
+53718
+41976
+34538
+37206
+35401
+38694
+53888
+47838
+40854
+41888
+53159
+54041
+78108
+82830
+43687
+44915
+57741
+58604
+48993
+59668
+60089
+61348
+86576
+83531
+69939
+71744
+73232
+72607
+74095
+98362
+91853
+82742
+127430
+84541
+85575
+93908
+103519
+88602
+92680
+101428
+106263
+106734
+107597
+108661
+121016
+135443
+134580
+175178
+141683
+171344
+144351
+145839
+181104
+158636
+193172
+250489
+167283
+173143
+170116
+174177
+245779
+313122
+200277
+194108
+207691
+311799
+214331
+216258
+295193
+255596
+356014
+278931
+286034
+287522
+374974
+290190
+304475
+325919
+328752
+340426
+361391
+341460
+343259
+462037
+374454
+401799
+394385
+407968
+408439
+422022
+430589
+501853
+506448
+534527
+628982
+700893
+564965
+683685
+695961
+594665
+1223647
+776253
+836491
+669178
+681886
+772049
+1351064
+717713
+824974
+768839
+989050
+802353
+816407
+830461
+852611
+932442
+1036380
+1571192
+1248650
+1295558
+1379646
+1159630
+1263843
+1276551
+1312378
+1386891
+1399599
+2560242
+2097911
+1450725
+1540888
+1520066
+1542687
+1593813
+1585246
+2763103
+2435979
+1646868
+1683072
+1785053
+1968822
+2821433
+2436181
+2408280
+2423473
+2539276
+2472008
+2995450
+2711977
+2929578
+3691724
+2850324
+2970791
+2991613
+5257614
+3060954
+3276885
+4444137
+3179059
+3232114
+3468125
+6229190
+5183985
+5655587
+3753875
+4908189
+6007401
+4831753
+4880288
+9920914
+5011284
+5322332
+5562301
+10563776
+5779902
+5821115
+5841937
+14752667
+6932934
+9843037
+6240013
+6745010
+8585628
+8937860
+9076207
+7222000
+8634163
+9316176
+9739942
+10442589
+10470490
+9891572
+9712041
+12774871
+10333616
+10573585
+16824506
+11342203
+14427565
+16682602
+12061128
+13063937
+15330638
+12985023
+13462013
+13967010
+15379173
+17664589
+15856163
+16538176
+16934041
+25747735
+20465157
+19451983
+21773169
+19603613
+20045657
+20285626
+20907201
+38597675
+21915788
+25046151
+23403331
+25125065
+25523141
+26028138
+28364196
+42331206
+26447036
+27429023
+35424830
+39649270
+32394339
+36141789
+33472217
+36386024
+47816179
+42855314
+58057577
+39889239
+51970177
+82504584
+41192827
+48336224
+59500355
+47040853
+48926472
+48528396
+54392334
+53876059
+79241338
+76275263
+134332840
+76617657
+62853853
+65866556
+73587166
+68780363
+83182642
+93163004
+111933636
+87705418
+81082066
+86930092
+91859416
+88233680
+122513638
+135274533
+162423980
+207920006
+111382249
+102802531
+131711038
+108268393
+116729912
+246266476
+142367529
+185367491
+131634216
+134646919
+370343986
+149862429
+195965535
+168012158
+204963592
+144381670
+258130822
+169315746
+175163772
+180093096
+284742070
+279394407
+211070924
+214184780
+219532443
+224998305
+234436747
+239902609
+434604499
+248364128
+519178817
+519297016
+281496645
+266281135
+279028589
+294244099
+344479518
+312393828
+380127364
+563770659
+363914113
+519643290
+388848189
+399625539
+453969190
+425255704
+430603367
+433717223
+908491479
+444530748
+459435052
+678967495
+683092288
+591422417
+733327707
+1252970997
+712745812
+1472262138
+545309724
+573272688
+701242017
+708393631
+1499913896
+833342762
+752762302
+844156287
+788473728
+1556902099
+853594729
+855859071
+893152275
+864320590
+1752647766
+1004744776
+903965800
+1032707740
+1118582412
+1501219540
+1424765179
+1745453552
+1326034990
+1246551741
+1253703355
+1274514705
+1454004319
+1534584779
+1461155933
+1541236030
+1596918589
+1644332799
+1632630015
+2445201830
+1709453800
+1717915319
+2995240349
+2871230178
+2151290152
+1908710576
+1936673540
+2178480505
+2707707674
+2365134153
+2500255096
+2600549695
+2521066446
+4672356598
+2528218060
+2714859288
+4405814957
+4424313088
+4304626263
+4074587953
+4244882494
+5100804791
+3896395824
+3342083815
+3427369119
+3618164376
+3845384116
+7692752329
+4060000728
+4087191081
+4115154045
+4886200599
+4543614658
+5079993441
+4865389249
+6424613884
+8568752422
+5049284506
+8269697204
+5243077348
+6142228407
+13669557213
+7501957072
+6769452934
+6960248191
+8360036539
+18749550654
+7272753235
+11779943410
+7045533495
+7463548492
+8388998774
+16081751103
+24441787642
+8202345126
+8658768703
+9409003907
+20625365761
+12911681341
+10292361854
+12012530282
+14652081255
+19811785620
+11385305755
+12203325539
+13644185479
+14509081987
+18658058990
+14318286730
+14005781686
+14736301727
+15247878621
+21114026467
+15665893618
+33100556345
+15852547266
+16591343900
+27962472209
+16861113829
+22304892136
+18067772610
+19701365761
+23588631294
+28159559962
+25391087441
+23397836037
+36779920085
+25029491234
+25894387742
+26939627266
+27649967165
+28324068416
+28742083413
+29054588457
+44511080994
+37552770757
+50628960552
+46391841026
+32713661095
+32443891166
+45020673791
+45717739775
+40258949866
+34928886439
+58326722476
+37769138371
+43099201798
+48427327271
+48788923478
+53353559650
+49292223779
+77481915728
+50923878976
+61037729511
+54589594431
+56392050578
+57066151829
+71841285211
+70213029537
+70266431852
+84160979397
+65157552261
+67372777605
+67642547534
+72698024810
+75187836305
+104277438626
+115392874305
+105141915976
+87061362150
+86196465642
+91526529069
+97216250749
+103881818210
+100216102755
+150179940538
+111655746260
+105513473407
+204769534969
+126658482430
+113458202407
+122223704090
+142107717063
+156409495179
+137855577071
+132530329866
+179298293794
+158899306674
+154703909684
+147885861115
+190473904268
+197040002476
+206919403374
+173257827792
+177722994711
+183412716391
+235681906497
+217340020617
+350980822503
+217169219667
+247621190470
+328824965927
+227737177497
+301007023737
+240116684837
+361135711102
+380151520336
+292559486755
+287234239550
+328329481339
+280416190981
+327184154909
+302589770799
+395063015328
+321143688907
+356670544183
+475798591334
+390332119765
+390427047459
+394892214378
+573744836156
+434509240284
+444906397164
+504403459217
+530326948296
+581423214718
+620888968094
+716206704235
+520532875818
+527350924387
+755652929191
+567650430531
+682126453928
+1151215916390
+1057221806052
+675479206309
+1043390859144
+659260314982
+1095001354918
+677814233090
+1065811326074
+835238516929
+1208141181386
+1077018668306
+829401454662
+879415637448
+938912699501
+1551445221164
+1752497874615
+1047883800205
+1088183306349
+1141421843912
+1635068566639
+1179793190800
+1341386768910
+1488661769644
+1226910745513
+1747443621331
+1334739521291
+1337074548072
+2482808612822
+1494498831911
+1743625559164
+1507215687752
+1513052750019
+1923421823278
+2015931367807
+1708817092110
+1768314154163
+1818328336949
+1927299437653
+2273652220792
+2136067106554
+3650999934446
+2189305644117
+2429570075259
+2476161365203
+2976455335549
+2568297514423
+2561650266804
+3695613591816
+4991220342063
+2671814069363
+2847792271310
+2831573379983
+3001714519663
+3007551581930
+3216032779862
+5808028715532
+5233464336167
+3850721260931
+3477131246273
+3586642491112
+4091980557741
+4775091708963
+4063366544207
+4325372750671
+4565637181813
+5147975434566
+4618875719376
+9473348185237
+5323953636513
+5129947781227
+5416089785733
+5679365651293
+8314489311192
+5839124961913
+5503387449346
+7977740052537
+5833287899646
+6693164026135
+8625106680839
+6802675270974
+9766851153942
+7063773737385
+7327852507204
+7540497790480
+7650009035319
+15642341818396
+9942829355889
+12688473225046
+14868350297684
+10034965505109
+9748823500603
+10122263168722
+10453901417740
+12017117662648
+11182753100639
+11512653550939
+11342512411259
+11336675348992
+12526451925781
+12897061637031
+17726563553140
+18877173139472
+13495839297109
+13866449008359
+14130527778178
+14977861542523
+17362818012313
+15190506825799
+23809278364248
+17398832535922
+32917070378939
+19691652856492
+45605543603985
+21790576766732
+24409715187970
+19871086669325
+20576164586462
+23353793011640
+22519428449631
+31207762018317
+32218104782273
+22679187760251
+26763510645390
+33473226223493
+41080356564780
+28473700839632
+27362288305468
+27626367075287
+27996976786537
+63599785014411
+42390515118956
+60215081568810
+32589339361721
+37090485392414
+37269919205247
+39562739525817
+42366741353194
+40447251255787
+50264277606364
+61099593298780
+58981615427663
+54125798950858
+45873221461271
+61063040201353
+49442698405641
+61946927063125
+50041476065719
+54988655380755
+104431353786396
+64632207510715
+105079458766502
+55359265092005
+55623343861824
+67559716312354
+69859258566968
+72152078887538
+89889949661428
+69679824754135
+144878605042183
+95315919866912
+80009990781604
+82813992608981
+152162069669142
+101496565323095
+104854836888934
+95914697526990
+99484174471360
+100861876842026
diff --git a/input/09sample b/input/09sample
new file mode 100644
index 0000000..28d66e4
--- /dev/null
+++ b/input/09sample
@@ -0,0 +1,20 @@
+35
+20
+15
+25
+47
+40
+62
+55
+65
+95
+102
+117
+150
+182
+127
+219
+299
+277
+309
+576
diff --git a/lib/Utils.hs b/lib/Utils.hs
index 4319714..89b1bd3 100644
--- a/lib/Utils.hs
+++ b/lib/Utils.hs
@@ -5,11 +5,13 @@ module Utils ( binaryToInt
              , bet
              , (&+)
              , howMany
+             , sublists
              ) where 
 
 import Data.Char (digitToInt)
 import Control.Monad
 import Data.Either
+import Data.List (inits, tails)
 
 
 binaryToInt :: String -> Int
@@ -34,3 +36,6 @@ bet k (l, u) = k >= l && k <= u
 
 howMany :: (a -> Bool) -> [a] -> Int
 howMany predicate = length . filter predicate
+
+sublists :: [a] -> [[a]]
+sublists = concatMap inits . tails