commit 7889fd6eef65803c56d676e5661d2e9c46e08e1f · hauleth.dev/advent-of-code

+102

2021/day14.txt

···

       1
       1
       +
       OFSNKKHCBSNKBKFFCVNB

     

       2
       2
       +
       

     

       3
       3
       +
       KC -> F

     

       4
       4
       +
       CO -> S

     

       5
       5
       +
       FH -> K

     

       6
       6
       +
       VP -> P

     

       7
       7
       +
       KF -> S

     

       8
       8
       +
       SV -> O

     

       9
       9
       +
       CB -> H

     

       10
       10
       +
       PN -> F

     

       11
       11
       +
       NC -> N

     

       12
       12
       +
       BC -> F

     

       13
       13
       +
       NP -> O

     

       14
       14
       +
       SK -> F

     

       15
       15
       +
       HS -> C

     

       16
       16
       +
       SN -> V

     

       17
       17
       +
       OP -> F

     

       18
       18
       +
       ON -> N

     

       19
       19
       +
       FK -> N

     

       20
       20
       +
       SH -> B

     

       21
       21
       +
       HN -> N

     

       22
       22
       +
       BO -> V

     

       23
       23
       +
       VK -> H

     

       24
       24
       +
       SC -> K

     

       25
       25
       +
       KP -> O

     

       26
       26
       +
       VO -> V

     

       27
       27
       +
       HC -> P

     

       28
       28
       +
       BK -> B

     

       29
       29
       +
       VH -> N

     

       30
       30
       +
       PV -> O

     

       31
       31
       +
       HB -> H

     

       32
       32
       +
       VS -> F

     

       33
       33
       +
       KK -> B

     

       34
       34
       +
       HH -> B

     

       35
       35
       +
       CF -> F

     

       36
       36
       +
       PH -> C

     

       37
       37
       +
       NS -> V

     

       38
       38
       +
       SO -> P

     

       39
       39
       +
       NV -> K

     

       40
       40
       +
       BP -> N

     

       41
       41
       +
       SF -> V

     

       42
       42
       +
       SS -> K

     

       43
       43
       +
       FP -> N

     

       44
       44
       +
       PC -> S

     

       45
       45
       +
       OH -> B

     

       46
       46
       +
       CH -> H

     

       47
       47
       +
       VV -> S

     

       48
       48
       +
       VN -> O

     

       49
       49
       +
       OB -> K

     

       50
       50
       +
       PF -> H

     

       51
       51
       +
       CS -> C

     

       52
       52
       +
       PP -> O

     

       53
       53
       +
       NF -> H

     

       54
       54
       +
       SP -> P

     

       55
       55
       +
       OS -> V

     

       56
       56
       +
       BB -> P

     

       57
       57
       +
       NO -> F

     

       58
       58
       +
       VB -> V

     

       59
       59
       +
       HK -> C

     

       60
       60
       +
       NK -> O

     

       61
       61
       +
       HP -> B

     

       62
       62
       +
       HV -> V

     

       63
       63
       +
       BF -> V

     

       64
       64
       +
       KO -> F

     

       65
       65
       +
       BV -> H

     

       66
       66
       +
       KV -> B

     

       67
       67
       +
       OF -> V

     

       68
       68
       +
       NB -> F

     

       69
       69
       +
       VF -> C

     

       70
       70
       +
       PB -> B

     

       71
       71
       +
       FF -> H

     

       72
       72
       +
       CP -> C

     

       73
       73
       +
       KH -> H

     

       74
       74
       +
       NH -> P

     

       75
       75
       +
       PS -> P

     

       76
       76
       +
       PK -> P

     

       77
       77
       +
       CC -> K

     

       78
       78
       +
       BS -> V

     

       79
       79
       +
       SB -> K

     

       80
       80
       +
       OO -> B

     

       81
       81
       +
       OK -> F

     

       82
       82
       +
       BH -> B

     

       83
       83
       +
       CV -> F

     

       84
       84
       +
       FN -> V

     

       85
       85
       +
       CN -> P

     

       86
       86
       +
       KB -> B

     

       87
       87
       +
       FO -> H

     

       88
       88
       +
       PO -> S

     

       89
       89
       +
       HO -> H

     

       90
       90
       +
       CK -> B

     

       91
       91
       +
       KN -> C

     

       92
       92
       +
       FS -> K

     

       93
       93
       +
       OC -> P

     

       94
       94
       +
       FV -> N

     

       95
       95
       +
       OV -> K

     

       96
       96
       +
       BN -> H

     

       97
       97
       +
       HF -> V

     

       98
       98
       +
       VC -> S

     

       99
       99
       +
       FB -> S

     

       100
       100
       +
       NN -> P

     

       101
       101
       +
       FC -> B

     

       102
       102
       +
       KS -> N

+100

2021/day15.txt

···

       1
       1
       +
       1124751783612228519483416186391693192764152281421133194141163183224351733212394799536339411529842112

     

       2
       2
       +
       1299938854391228215712461147511117912185733411491416388811646391912138661213722223824151532652174491

     

       3
       3
       +
       3339197559983134739317425934547716331696227221882122961476799987711635499267472178182145359213635923

     

       4
       4
       +
       3275111279884782539314241187762113814171394161491634629424134127254634143155261122133724143114517171

     

       5
       5
       +
       3719252118791433135122231855197812222238914994648147192141951214948299478914959275216261881654181459

     

       6
       6
       +
       1611117951314292139456114142392662772939225937136486428161234281216234329234315111776511563151948482

     

       7
       7
       +
       2568826483341639224876553822412669632282339258375519267395999314194775717338955473111882125281113119

     

       8
       8
       +
       3211535497996954958315977618271374429983722314139733843419727946959246752499319415154271225547899217

     

       9
       9
       +
       9182381814515842193317619241122295417132515941811977373112934221316141138111911121121111793678163186

     

       10
       10
       +
       3844189817214722127981149242928145957137126937131386516329118218111198674162815191994371914762733967

     

       11
       11
       +
       2341991198198671797918854491942998311516141218456591158159195192211227471918835699934872448189793938

     

       12
       12
       +
       4914562622368117861639397331397217328431182986624263992197435816915439591962133158497224891382954532

     

       13
       13
       +
       7626651214813838216185911429272999894518636231382989678893369367388711391734813452975811156327428911

     

       14
       14
       +
       6619547343521975253174481211413831293662121339851815212317311237391545399111182897667911821424149598

     

       15
       15
       +
       9973191187241313192815214227191649743296915314888729322114168515823743777711899119191553298115729119

     

       16
       16
       +
       1139287494922611751257731929722771498336139611251121442114394245137973342111145499332316959261235284

     

       17
       17
       +
       2957197428427162517942347211164151149912112158641321995248419171621811597221619949431227171998811472

     

       18
       18
       +
       3942647388316719894411111531921126183713231811198382654685441319271454138942281133619242611612293827

     

       19
       19
       +
       7937119217256311112391437861121498616811956123353462521891125694135126297129995285155114368995531781

     

       20
       20
       +
       3451961913122271833382989211151286596622992323752134162138122516383189222433812253226845819142198221

     

       21
       21
       +
       2778119153629891339923532321818124533756116181684147179833125112111826952511175359231299984985971323

     

       22
       22
       +
       3111241849191534385261731569341927433476113958471723118832747854529179328115274125434719722218912131

     

       23
       23
       +
       3142339531392581988128137411211196234548128214999949588185228836196627923352221497911291281534111199

     

       24
       24
       +
       2247331434479875142918842833898559624238445292211715118881294135283574749565172271411631413491566199

     

       25
       25
       +
       5942278576394177315387294721122691617961774138211922471397191215938266718124567292193989959261637132

     

       26
       26
       +
       3165937631221963265792414421441393495719931248192344794567976762321141859115829128661211272472736862

     

       27
       27
       +
       6245216271127518123199222191484234611151315582117171596574729739922992724612599562343116361844622764

     

       28
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       +
       8113544322656226212151951279235114941989556194198115559251582213981835589429635885493383187341531965

     

       29
       29
       +
       9167334539972119189967382996641594933763662148772253141953186111414742999511119411388291132416516449

     

       30
       30
       +
       3613823811913288411123382135529243111267199921121439155729919326116169791514491996989971122517181152

     

       31
       31
       +
       8673611192477161631212112481894911858892968239143914865319658975331149334747126743512225484277694151

     

       32
       32
       +
       1573562476555619452428261559215411721579288335558515411134313992163812836653437129992833619198146362

     

       33
       33
       +
       1985275213511588337218921661953495211191671194622531866114745941231929893241192939732541431596251229

     

       34
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       +
       1265136118282217612545222191931962743537199362634214512441818421145212152171522295123221817416511192

     

       35
       35
       +
       8297798221482948311881157477219864767525628534952929138168821168196211119111519681828383199111919196

     

       36
       36
       +
       2534111997313111473186996839118152776719511994169115192212165984228917912783244345623614586619121326

     

       37
       37
       +
       5841498181267192895193154811932281737529524821838531213993721717189699211939288511893237393416182963

     

       38
       38
       +
       4291365191619323711913413926441339411267931111249294286234263722174939997111633217333235111582923441

     

       39
       39
       +
       1287162672582123747413148471918114922719181577167138269131143162782619895168443398922587114315692159

     

       40
       40
       +
       1265925622411611266789112299971891313715613359912627191225939742625214121139321211686759611131173819

     

       41
       41
       +
       2138953588999163543822384688714958315246965691333881631171314291246656696539111996811849918124146199

     

       42
       42
       +
       1246641611311144149732152211911939355725818779248359199268117115556131393567479697235189376137881341

     

       43
       43
       +
       2899323821125691382122622121279464139996512843263627599964991689326381239953514685697311811566519319

     

       44
       44
       +
       2736949532739218813892326217621918912123391961114292438971239114718244292915281445924621121161621333

     

       45
       45
       +
       3284227711481113791259114169152546556372395121491214478676766673451539272714243257528999117191132191

     

       46
       46
       +
       1491645992221246232691159831148693751711539199173418148515113374123227919399121713163369423119344294

     

       47
       47
       +
       9132112419279766149552388219119879126631964411873291514292382629182256527396923261916197289667422219

     

       48
       48
       +
       4435263531452645499818123111966429163563711994892138163281911392712947829833494132517185151159797235

     

       49
       49
       +
       3377999473376535692397871161267942211991447319627223732643859136911321291147933161219919912554143594

     

       50
       50
       +
       3949323991733462336411199416212721417161994737197381813716349241925143828318311249159179991229329171

     

       51
       51
       +
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       52
       52
       +
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       53
       53
       +
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       54
       54
       +
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       55
       55
       +
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       56
       56
       +
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       57
       57
       +
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       58
       58
       +
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       59
       59
       +
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       60
       60
       +
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       61
       61
       +
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       62
       62
       +
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       63
       63
       +
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       64
       64
       +
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       65
       65
       +
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       66
       66
       +
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       67
       67
       +
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       68
       68
       +
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       69
       69
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       70
       70
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       71
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       72
       72
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       73
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       74
       74
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       75
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       76
       76
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       77
       77
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       78
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       79
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       80
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       81
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       82
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       83
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       84
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       85
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       86
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       87
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       88
       88
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       89
       89
       +
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       90
       90
       +
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       91
       91
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       92
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       +
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       93
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       +
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       94
       94
       +
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       95
       95
       +
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       96
       96
       +
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       97
       97
       +
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       98
       98
       +
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       99
       99
       +
       6926527339383986515331739126963132928923957918814875739969162479336291216879152811764569629328261149

     

       100
       100
       +
       7598541186247351172883789213137911264491891391569216562276119911413437411237411934123311912324427449

2021/day16.txt

···

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       1
       +
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

+802

2021/solutions.livemd

···

       1159
       1159
        
       ```

     

       1160
       1160
        
       

     

       1161
       1161
        
       ## Day 14

     

       1162
       1162
       +
       

     

       1163
       1163
       +
       ```elixir

     

       1164
       1164
       +
       [polymer_raw, subs] =

     

       1165
       1165
       +
         File.read!("day14.txt")

     

       1166
       1166
       +
         |> String.split("\n\n")

     

       1167
       1167
       +
       

     

       1168
       1168
       +
       <<first, _::binary>> = polymer_raw

     

       1169
       1169
       +
       

     

       1170
       1170
       +
       polymer =

     

       1171
       1171
       +
         {first,

     

       1172
       1172
       +
          polymer_raw

     

       1173
       1173
       +
          |> String.to_charlist()

     

       1174
       1174
       +
          |> Enum.chunk_every(2, 1, :discard)

     

       1175
       1175
       +
          |> Enum.frequencies()}

     

       1176
       1176
       +
       

     

       1177
       1177
       +
       subs =

     

       1178
       1178
       +
         subs

     

       1179
       1179
       +
         |> String.trim()

     

       1180
       1180
       +
         |> String.split(["\n", " -> "])

     

       1181
       1181
       +
         |> Enum.chunk_every(2)

     

       1182
       1182
       +
         |> Map.new(fn [pair, <<new>>] -> {String.to_charlist(pair), new} end)

     

       1183
       1183
       +
       

     

       1184
       1184
       +
       defmodule Day14 do

     

       1185
       1185
       +
         def expand({hd, polymer}, subs) do

     

       1186
       1186
       +
           new =

     

       1187
       1187
       +
             polymer

     

       1188
       1188
       +
             |> Enum.reduce(%{}, fn {[a, b] = pair, count}, acc ->

     

       1189
       1189
       +
               s = Map.fetch!(subs, pair)

     

       1190
       1190
       +
       

     

       1191
       1191
       +
               acc

     

       1192
       1192
       +
               |> Map.update([a, s], count, &(&1 + count))

     

       1193
       1193
       +
               |> Map.update([s, b], count, &(&1 + count))

     

       1194
       1194
       +
             end)

     

       1195
       1195
       +
       

     

       1196
       1196
       +
           {hd, new}

     

       1197
       1197
       +
         end

     

       1198
       1198
       +
       

     

       1199
       1199
       +
         def expand_naive(polymer, subs) do

     

       1200
       1200
       +
           polymer

     

       1201
       1201
       +
           |> to_charlist()

     

       1202
       1202
       +
           |> Enum.chunk_every(2, 1, :discard)

     

       1203
       1203
       +
           |> Enum.flat_map(fn [a, b] = pair ->

     

       1204
       1204
       +
             [a, subs[pair], b]

     

       1205
       1205
       +
           end)

     

       1206
       1206
       +
           |> List.to_string()

     

       1207
       1207
       +
         end

     

       1208
       1208
       +
       

     

       1209
       1209
       +
         def frequencies({hd, polymer}) do

     

       1210
       1210
       +
           polymer

     

       1211
       1211
       +
           |> Enum.reduce(%{hd => 1}, fn {[_, b], count}, acc ->

     

       1212
       1212
       +
             Map.update(acc, b, count, &(&1 + count))

     

       1213
       1213
       +
           end)

     

       1214
       1214
       +
         end

     

       1215
       1215
       +
       end

     

       1216
       1216
       +
       ```

     

       1217
       1217
       +
       

     

       1218
       1218
       +
       ```output

     

       1219
       1219
       +
       {:module, Day14, <<70, 79, 82, 49, 0, 0, 13, ...>>, {:frequencies, 1}}

     

       1220
       1220
       +
       ```

     

       1221
       1221
       +
       

     

       1222
       1222
       +
       ```elixir

     

       1223
       1223
       +
       {{_, min}, {_, max}} =

     

       1224
       1224
       +
         1..10

     

       1225
       1225
       +
         |> Enum.reduce(polymer, fn _, acc ->

     

       1226
       1226
       +
           Day14.expand(acc, subs)

     

       1227
       1227
       +
         end)

     

       1228
       1228
       +
         |> Day14.frequencies()

     

       1229
       1229
       +
         |> Enum.min_max_by(&elem(&1, 1))

     

       1230
       1230
       +
       

     

       1231
       1231
       +
       # 2768

     

       1232
       1232
       +
       max - min

     

       1233
       1233
       +
       ```

     

       1234
       1234
       +
       

     

       1235
       1235
       +
       ```output

     

       1236
       1236
       +
       2768

     

       1237
       1237
       +
       ```

     

       1238
       1238
       +
       

     

       1239
       1239
       +
       ```elixir

     

       1240
       1240
       +
       {{_, min}, {_, max}} =

     

       1241
       1241
       +
         1..40

     

       1242
       1242
       +
         |> Enum.reduce(polymer, fn _, acc ->

     

       1243
       1243
       +
           Day14.expand(acc, subs)

     

       1244
       1244
       +
         end)

     

       1245
       1245
       +
         |> Day14.frequencies()

     

       1246
       1246
       +
         |> Enum.min_max_by(&elem(&1, 1))

     

       1247
       1247
       +
       

     

       1248
       1248
       +
       max - min

     

       1249
       1249
       +
       ```

     

       1250
       1250
       +
       

     

       1251
       1251
       +
       ```output

     

       1252
       1252
       +
       2914365137499

     

       1253
       1253
       +
       ```

     

       1254
       1254
       +
       

     

       1255
       1255
       +
       ## Day 15

     

       1256
       1256
       +
       

     

       1257
       1257
       +
       ```elixir

     

       1258
       1258
       +
       input =

     

       1259
       1259
       +
         File.read!("day15.txt")

     

       1260
       1260
       +
         |> String.trim()

     

       1261
       1261
       +
         |> String.split("\n")

     

       1262
       1262
       +
         |> Enum.map(&String.to_charlist/1)

     

       1263
       1263
       +
         |> Enum.with_index()

     

       1264
       1264
       +
         |> Enum.flat_map(fn {row, y} ->

     

       1265
       1265
       +
           row

     

       1266
       1266
       +
           |> Enum.with_index()

     

       1267
       1267
       +
           |> Enum.map(fn {v, x} -> {{x, y}, v - ?0} end)

     

       1268
       1268
       +
         end)

     

       1269
       1269
       +
         |> Map.new()

     

       1270
       1270
       +
       

     

       1271
       1271
       +
       {width, height} = Enum.max(Map.keys(input))

     

       1272
       1272
       +
       ```

     

       1273
       1273
       +
       

     

       1274
       1274
       +
       ```output

     

       1275
       1275
       +
       {99, 99}

     

       1276
       1276
       +
       ```

     

       1277
       1277
       +
       

     

       1278
       1278
       +
       ```elixir

     

       1279
       1279
       +
       shortest_paths =

     

       1280
       1280
       +
         for y <- height..0//-1,

     

       1281
       1281
       +
             x <- width..0//-1,

     

       1282
       1282
       +
             reduce: %{} do

     

       1283
       1283
       +
           acc ->

     

       1284
       1284
       +
             right = acc[{x + 1, y}]

     

       1285
       1285
       +
             bottom = acc[{x, y + 1}]

     

       1286
       1286
       +
       

     

       1287
       1287
       +
             value =

     

       1288
       1288
       +
               case {right, bottom} do

     

       1289
       1289
       +
                 {nil, nil} -> input[{x, y}]

     

       1290
       1290
       +
                 _ -> input[{x, y}] + min(right, bottom)

     

       1291
       1291
       +
               end

     

       1292
       1292
       +
       

     

       1293
       1293
       +
             Map.put(acc, {x, y}, value)

     

       1294
       1294
       +
         end

     

       1295
       1295
       +
       

     

       1296
       1296
       +
       shortest_paths[{0, 0}] - input[{0, 0}]

     

       1297
       1297
       +
       ```

     

       1298
       1298
       +
       

     

       1299
       1299
       +
       ```output

     

       1300
       1300
       +
       429

     

       1301
       1301
       +
       ```

     

       1302
       1302
       +
       

     

       1303
       1303
       +
       ```elixir

     

       1304
       1304
       +
       defmodule Day15.Task2 do

     

       1305
       1305
       +
         def expand_grid(board) do

     

       1306
       1306
       +
           {width, height} = Enum.max(Map.keys(board))

     

       1307
       1307
       +
       

     

       1308
       1308
       +
           board

     

       1309
       1309
       +
           |> Enum.flat_map(fn {{x, y}, v} ->

     

       1310
       1310
       +
             for rx <- 0..4, ry <- 0..4 do

     

       1311
       1311
       +
               {{x + (width + 1) * rx, y + (height + 1) * ry}, rem(v - 1 + rx + ry, 9) + 1}

     

       1312
       1312
       +
             end

     

       1313
       1313
       +
           end)

     

       1314
       1314
       +
           |> Map.new()

     

       1315
       1315
       +
         end

     

       1316
       1316
       +
       

     

       1317
       1317
       +
         def find_path(board, start, finish) do

     

       1318
       1318
       +
           dists = :gb_sets.singleton({0, start})

     

       1319
       1319
       +
       

     

       1320
       1320
       +
           find_path(board, finish, dists, MapSet.new())

     

       1321
       1321
       +
         end

     

       1322
       1322
       +
       

     

       1323
       1323
       +
         @surround for dx <- -1..1, dy <- -1..1, abs(dx) != abs(dy), do: {dx, dy}

     

       1324
       1324
       +
       

     

       1325
       1325
       +
         def find_path(board, finish, dists, visited) do

     

       1326
       1326
       +
           {{dist, {x, y} = curr}, dists} = :gb_sets.take_smallest(dists)

     

       1327
       1327
       +
       

     

       1328
       1328
       +
           if curr == finish do

     

       1329
       1329
       +
             dist

     

       1330
       1330
       +
           else

     

       1331
       1331
       +
             visited = MapSet.put(visited, curr)

     

       1332
       1332
       +
       

     

       1333
       1333
       +
             dists =

     

       1334
       1334
       +
               for {dx, dy} <- @surround,

     

       1335
       1335
       +
                   next = {x + dx, y + dy},

     

       1336
       1336
       +
                   next not in visited,

     

       1337
       1337
       +
                   is_map_key(board, next),

     

       1338
       1338
       +
                   alt = dist + board[next],

     

       1339
       1339
       +
                   reduce: dists do

     

       1340
       1340
       +
                 acc ->

     

       1341
       1341
       +
                   :gb_sets.add_element({alt, next}, acc)

     

       1342
       1342
       +
               end

     

       1343
       1343
       +
       

     

       1344
       1344
       +
             find_path(board, finish, dists, visited)

     

       1345
       1345
       +
           end

     

       1346
       1346
       +
         end

     

       1347
       1347
       +
       end

     

       1348
       1348
       +
       ```

     

       1349
       1349
       +
       

     

       1350
       1350
       +
       ```output

     

       1351
       1351
       +
       {:module, Day15.Task2, <<70, 79, 82, 49, 0, 0, 16, ...>>, {:find_path, 4}}

     

       1352
       1352
       +
       ```

     

       1353
       1353
       +
       

     

       1354
       1354
       +
       ```elixir

     

       1355
       1355
       +
       input

     

       1356
       1356
       +
       |> Day15.Task2.expand_grid()

     

       1357
       1357
       +
       |> Day15.Task2.find_path({0, 0}, {499, 499})

     

       1358
       1358
       +
       ```

     

       1359
       1359
       +
       

     

       1360
       1360
       +
       ```output

     

       1361
       1361
       +
       2844

     

       1362
       1362
       +
       ```

     

       1363
       1363
       +
       

     

       1364
       1364
       +
       ## Day 16

     

       1365
       1365
       +
       

     

       1366
       1366
       +
       ```elixir

     

       1367
       1367
       +
       defmodule Day16 do

     

       1368
       1368
       +
         defmodule Packet do

     

       1369
       1369
       +
           defstruct [:version, :type, :value]

     

       1370
       1370
       +
         end

     

       1371
       1371
       +
       

     

       1372
       1372
       +
         def decode(<<version::3, 4::3, rest::bitstring>>) do

     

       1373
       1373
       +
           {value, rest} = literal(rest, 0)

     

       1374
       1374
       +
       

     

       1375
       1375
       +
           {%Packet{type: 4, version: version, value: value}, rest}

     

       1376
       1376
       +
         end

     

       1377
       1377
       +
       

     

       1378
       1378
       +
         def decode(<<version::3, type::3, 0::1, length::15, rest::bitstring>>) do

     

       1379
       1379
       +
           <<subpackets::bitstring-size(length), rest::bitstring>> = rest

     

       1380
       1380
       +
       

     

       1381
       1381
       +
           {%Packet{type: type, version: version, value: decode_all(subpackets)}, rest}

     

       1382
       1382
       +
         end

     

       1383
       1383
       +
       

     

       1384
       1384
       +
         def decode(<<version::3, type::3, 1::1, length::11, rest::bitstring>>) do

     

       1385
       1385
       +
           {value, rest} = Enum.map_reduce(1..length, rest, fn _, acc -> decode(acc) end)

     

       1386
       1386
       +
       

     

       1387
       1387
       +
           {%Packet{type: type, version: version, value: value}, rest}

     

       1388
       1388
       +
         end

     

       1389
       1389
       +
       

     

       1390
       1390
       +
         def decode_all(input) do

     

       1391
       1391
       +
           case decode(input) do

     

       1392
       1392
       +
             {packet, <<>>} -> [packet]

     

       1393
       1393
       +
             {packet, rest} -> [packet | decode_all(rest)]

     

       1394
       1394
       +
           end

     

       1395
       1395
       +
         end

     

       1396
       1396
       +
       

     

       1397
       1397
       +
         defp literal(<<1::1, bits::4, rest::bitstring>>, acc) do

     

       1398
       1398
       +
           literal(rest, acc * 0x10 + bits)

     

       1399
       1399
       +
         end

     

       1400
       1400
       +
       

     

       1401
       1401
       +
         defp literal(<<0::1, bits::4, rest::bitstring>>, acc) do

     

       1402
       1402
       +
           {acc * 0x10 + bits, rest}

     

       1403
       1403
       +
         end

     

       1404
       1404
       +
       end

     

       1405
       1405
       +
       

     

       1406
       1406
       +
       input =

     

       1407
       1407
       +
         File.read!("day16.txt")

     

       1408
       1408
       +
         |> String.trim()

     

       1409
       1409
       +
         |> Base.decode16!()

     

       1410
       1410
       +
         |> Day16.decode()

     

       1411
       1411
       +
         |> elem(0)

     

       1412
       1412
       +
       ```

     

       1413
       1413
       +
       

     

       1414
       1414
       +
       ```output

     

       1415
       1415
       +
       %Day16.Packet{

     

       1416
       1416
       +
         type: 0,

     

       1417
       1417
       +
         value: [

     

       1418
       1418
       +
           %Day16.Packet{

     

       1419
       1419
       +
             type: 1,

     

       1420
       1420
       +
             value: [

     

       1421
       1421
       +
               %Day16.Packet{type: 4, value: 20, version: 6},

     

       1422
       1422
       +
               %Day16.Packet{

     

       1423
       1423
       +
                 type: 6,

     

       1424
       1424
       +
                 value: [

     

       1425
       1425
       +
                   %Day16.Packet{type: 4, value: 14747, version: 1},

     

       1426
       1426
       +
                   %Day16.Packet{type: 4, value: 14747, version: 6}

     

       1427
       1427
       +
                 ],

     

       1428
       1428
       +
                 version: 2

     

       1429
       1429
       +
               }

     

       1430
       1430
       +
             ],

     

       1431
       1431
       +
             version: 1

     

       1432
       1432
       +
           },

     

       1433
       1433
       +
           %Day16.Packet{

     

       1434
       1434
       +
             type: 3,

     

       1435
       1435
       +
             value: [

     

       1436
       1436
       +
               %Day16.Packet{type: 4, value: 15, version: 5},

     

       1437
       1437
       +
               %Day16.Packet{type: 4, value: 10, version: 6}

     

       1438
       1438
       +
             ],

     

       1439
       1439
       +
             version: 7

     

       1440
       1440
       +
           },

     

       1441
       1441
       +
           %Day16.Packet{

     

       1442
       1442
       +
             type: 1,

     

       1443
       1443
       +
             value: [

     

       1444
       1444
       +
               %Day16.Packet{

     

       1445
       1445
       +
                 type: 7,

     

       1446
       1446
       +
                 value: [

     

       1447
       1447
       +
                   %Day16.Packet{type: 4, value: 2184, version: 1},

     

       1448
       1448
       +
                   %Day16.Packet{type: 4, value: 130250, version: 6}

     

       1449
       1449
       +
                 ],

     

       1450
       1450
       +
                 version: 6

     

       1451
       1451
       +
               },

     

       1452
       1452
       +
               %Day16.Packet{type: 4, value: 5442981, version: 4}

     

       1453
       1453
       +
             ],

     

       1454
       1454
       +
             version: 6

     

       1455
       1455
       +
           },

     

       1456
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       1768
       1768
       +
             ],

     

       1769
       1769
       +
             version: 4

     

       1770
       1770
       +
           },

     

       1771
       1771
       +
           %Day16.Packet{

     

       1772
       1772
       +
             type: 0,

     

       1773
       1773
       +
             value: [

     

       1774
       1774
       +
               %Day16.Packet{type: 4, value: 2541, version: 3},

     

       1775
       1775
       +
               %Day16.Packet{type: 4, value: 263947, version: 6},

     

       1776
       1776
       +
               %Day16.Packet{type: 4, value: 7686705, version: 5},

     

       1777
       1777
       +
               %Day16.Packet{type: 4, value: 31, version: 4}

     

       1778
       1778
       +
             ],

     

       1779
       1779
       +
             version: 2

     

       1780
       1780
       +
           },

     

       1781
       1781
       +
           %Day16.Packet{

     

       1782
       1782
       +
             type: 1,

     

       1783
       1783
       +
             value: [

     

       1784
       1784
       +
               %Day16.Packet{

     

       1785
       1785
       +
                 type: 6,

     

       1786
       1786
       +
                 value: [

     

       1787
       1787
       +
                   %Day16.Packet{type: 4, value: 3193865, version: 1},

     

       1788
       1788
       +
                   %Day16.Packet{type: 4, value: 20223, version: 7}

     

       1789
       1789
       +
                 ],

     

       1790
       1790
       +
                 version: 2

     

       1791
       1791
       +
               },

     

       1792
       1792
       +
               %Day16.Packet{type: 4, value: 9328522, version: 5}

     

       1793
       1793
       +
             ],

     

       1794
       1794
       +
             version: 0

     

       1795
       1795
       +
           },

     

       1796
       1796
       +
           %Day16.Packet{

     

       1797
       1797
       +
             type: 2,

     

       1798
       1798
       +
             value: [

     

       1799
       1799
       +
               %Day16.Packet{type: 4, value: 5, version: 4},

     

       1800
       1800
       +
               %Day16.Packet{type: 4, value: 7, version: 3},

     

       1801
       1801
       +
               %Day16.Packet{type: 4, value: 179420284, version: 4},

     

       1802
       1802
       +
               %Day16.Packet{type: 4, value: 19890, version: 1},

     

       1803
       1803
       +
               %Day16.Packet{type: 4, value: 2655, version: 0}

     

       1804
       1804
       +
             ],

     

       1805
       1805
       +
             version: 7

     

       1806
       1806
       +
           },

     

       1807
       1807
       +
           %Day16.Packet{

     

       1808
       1808
       +
             type: 1,

     

       1809
       1809
       +
             value: [

     

       1810
       1810
       +
               %Day16.Packet{type: 4, value: 862089, version: 1},

     

       1811
       1811
       +
               %Day16.Packet{

     

       1812
       1812
       +
                 type: 6,

     

       1813
       1813
       +
                 value: [

     

       1814
       1814
       +
                   %Day16.Packet{type: 4, value: 248, version: 3},

     

       1815
       1815
       +
                   %Day16.Packet{type: 4, value: 3286, version: 5}

     

       1816
       1816
       +
                 ],

     

       1817
       1817
       +
                 version: 3

     

       1818
       1818
       +
               }

     

       1819
       1819
       +
             ],

     

       1820
       1820
       +
             version: 3

     

       1821
       1821
       +
           },

     

       1822
       1822
       +
           %Day16.Packet{

     

       1823
       1823
       +
             type: 1,

     

       1824
       1824
       +
             value: [

     

       1825
       1825
       +
               %Day16.Packet{type: 4, value: 93, version: 6},

     

       1826
       1826
       +
               %Day16.Packet{

     

       1827
       1827
       +
                 type: 5,

     

       1828
       1828
       +
                 value: [

     

       1829
       1829
       +
                   %Day16.Packet{type: 4, value: 4269, version: 6},

     

       1830
       1830
       +
                   %Day16.Packet{type: 4, value: 240, version: 3}

     

       1831
       1831
       +
                 ],

     

       1832
       1832
       +
                 version: 4

     

       1833
       1833
       +
               }

     

       1834
       1834
       +
             ],

     

       1835
       1835
       +
             version: 5

     

       1836
       1836
       +
           },

     

       1837
       1837
       +
           %Day16.Packet{

     

       1838
       1838
       +
             type: 3,

     

       1839
       1839
       +
             value: [

     

       1840
       1840
       +
               %Day16.Packet{type: 4, value: 2938, version: 6},

     

       1841
       1841
       +
               %Day16.Packet{type: 4, value: 3, version: 6},

     

       1842
       1842
       +
               %Day16.Packet{type: 4, value: 211, version: 7}

     

       1843
       1843
       +
             ],

     

       1844
       1844
       +
             version: 3

     

       1845
       1845
       +
           },

     

       1846
       1846
       +
           %Day16.Packet{

     

       1847
       1847
       +
             type: 1,

     

       1848
       1848
       +
             value: [

     

       1849
       1849
       +
               %Day16.Packet{

     

       1850
       1850
       +
                 type: 7,

     

       1851
       1851
       +
                 value: [

     

       1852
       1852
       +
                   %Day16.Packet{type: 4, value: 159, version: 0},

     

       1853
       1853
       +
                   %Day16.Packet{type: 4, value: 159, version: 5}

     

       1854
       1854
       +
                 ],

     

       1855
       1855
       +
                 version: 0

     

       1856
       1856
       +
               },

     

       1857
       1857
       +
               %Day16.Packet{type: 4, value: 28, version: 1}

     

       1858
       1858
       +
             ],

     

       1859
       1859
       +
             version: 4

     

       1860
       1860
       +
           },

     

       1861
       1861
       +
           %Day16.Packet{type: 4, value: 84, version: 4},

     

       1862
       1862
       +
           %Day16.Packet{

     

       1863
       1863
       +
             type: 1,

     

       1864
       1864
       +
             value: [

     

       1865
       1865
       +
               %Day16.Packet{type: 4, value: 235, version: 4},

     

       1866
       1866
       +
               %Day16.Packet{

     

       1867
       1867
       +
                 type: 6,

     

       1868
       1868
       +
                 value: [

     

       1869
       1869
       +
                   %Day16.Packet{type: 0, value: [%Day16.Packet{...}, ...], version: 4},

     

       1870
       1870
       +
                   %Day16.Packet{type: 0, value: [...], ...}

     

       1871
       1871
       +
                 ],

     

       1872
       1872
       +
                 version: 3

     

       1873
       1873
       +
               }

     

       1874
       1874
       +
             ],

     

       1875
       1875
       +
             version: 6

     

       1876
       1876
       +
           },

     

       1877
       1877
       +
           %Day16.Packet{type: 4, value: 1425, version: 4},

     

       1878
       1878
       +
           %Day16.Packet{

     

       1879
       1879
       +
             type: 1,

     

       1880
       1880
       +
             value: [

     

       1881
       1881
       +
               %Day16.Packet{

     

       1882
       1882
       +
                 type: 7,

     

       1883
       1883
       +
                 value: [%Day16.Packet{type: 0, value: [...], ...}, %Day16.Packet{type: 0, ...}],

     

       1884
       1884
       +
                 version: 5

     

       1885
       1885
       +
               },

     

       1886
       1886
       +
               %Day16.Packet{type: 4, value: 13, version: 2}

     

       1887
       1887
       +
             ],

     

       1888
       1888
       +
             version: 2

     

       1889
       1889
       +
           },

     

       1890
       1890
       +
           %Day16.Packet{type: 0, value: [%Day16.Packet{type: 4, value: 3121, version: 6}], version: 5},

     

       1891
       1891
       +
           %Day16.Packet{

     

       1892
       1892
       +
             type: 1,

     

       1893
       1893
       +
             value: [

     

       1894
       1894
       +
               %Day16.Packet{type: 4, value: 51, version: 2},

     

       1895
       1895
       +
               %Day16.Packet{type: 4, value: 61, ...},

     

       1896
       1896
       +
               %Day16.Packet{type: 4, ...}

     

       1897
       1897
       +
             ],

     

       1898
       1898
       +
             version: 4

     

       1899
       1899
       +
           },

     

       1900
       1900
       +
           %Day16.Packet{

     

       1901
       1901
       +
             type: 1,

     

       1902
       1902
       +
             value: [%Day16.Packet{type: 4, value: 1393, ...}, %Day16.Packet{type: 5, ...}],

     

       1903
       1903
       +
             version: 3

     

       1904
       1904
       +
           },

     

       1905
       1905
       +
           %Day16.Packet{type: 1, value: [%Day16.Packet{type: 7, ...}, %Day16.Packet{...}], version: 3},

     

       1906
       1906
       +
           %Day16.Packet{type: 1, value: [%Day16.Packet{...}, ...], version: 7},

     

       1907
       1907
       +
           %Day16.Packet{type: 3, value: [...], ...},

     

       1908
       1908
       +
           %Day16.Packet{type: 2, ...},

     

       1909
       1909
       +
           %Day16.Packet{...},

     

       1910
       1910
       +
           ...

     

       1911
       1911
       +
         ],

     

       1912
       1912
       +
         version: 3

     

       1913
       1913
       +
       }

     

       1914
       1914
       +
       ```

     

       1915
       1915
       +
       

     

       1916
       1916
       +
       ```elixir

     

       1917
       1917
       +
       defmodule Day16.Task1 do

     

       1918
       1918
       +
         alias Day16.Packet

     

       1919
       1919
       +
       

     

       1920
       1920
       +
         def sum(%Packet{type: 4, version: version}), do: version

     

       1921
       1921
       +
       

     

       1922
       1922
       +
         def sum(%Packet{version: version, value: value}) do

     

       1923
       1923
       +
           Enum.reduce(value, version, &(sum(&1) + &2))

     

       1924
       1924
       +
         end

     

       1925
       1925
       +
       end

     

       1926
       1926
       +
       

     

       1927
       1927
       +
       Day16.Task1.sum(input)

     

       1928
       1928
       +
       ```

     

       1929
       1929
       +
       

     

       1930
       1930
       +
       ```output

     

       1931
       1931
       +
       949

     

       1932
       1932
       +
       ```

     

       1933
       1933
       +
       

     

       1934
       1934
       +
       ```elixir

     

       1935
       1935
       +
       defmodule Day16.Task2 do

     

       1936
       1936
       +
         alias Day16.Packet

     

       1937
       1937
       +
       

     

       1938
       1938
       +
         def evaluate(%Packet{type: 0} = packet), do: reduce(packet, 0, &+/2)

     

       1939
       1939
       +
         def evaluate(%Packet{type: 1} = packet), do: reduce(packet, 1, &*/2)

     

       1940
       1940
       +
         def evaluate(%Packet{type: 2} = packet), do: reduce(packet, :inf, &min/2)

     

       1941
       1941
       +
         def evaluate(%Packet{type: 3} = packet), do: reduce(packet, 0, &max/2)

     

       1942
       1942
       +
       

     

       1943
       1943
       +
         def evaluate(%Packet{type: 4, value: value}), do: value

     

       1944
       1944
       +
       

     

       1945
       1945
       +
         def evaluate(%Packet{type: 5} = packet), do: compare(packet, &>/2)

     

       1946
       1946
       +
         def evaluate(%Packet{type: 6} = packet), do: compare(packet, &</2)

     

       1947
       1947
       +
         def evaluate(%Packet{type: 7} = packet), do: compare(packet, &==/2)

     

       1948
       1948
       +
       

     

       1949
       1949
       +
         defp reduce(%Packet{value: value}, initial, op) do

     

       1950
       1950
       +
           Enum.reduce(value, initial, &op.(evaluate(&1), &2))

     

       1951
       1951
       +
         end

     

       1952
       1952
       +
       

     

       1953
       1953
       +
         defp compare(%Packet{value: [a, b]}, op) do

     

       1954
       1954
       +
           if op.(evaluate(a), evaluate(b)), do: 1, else: 0

     

       1955
       1955
       +
         end

     

       1956
       1956
       +
       end

     

       1957
       1957
       +
       

     

       1958
       1958
       +
       Day16.Task2.evaluate(input)

     

       1959
       1959
       +
       ```

     

       1960
       1960
       +
       

     

       1961
       1961
       +
       ```output

     

       1962
       1962
       +
       1114600142730

     

       1963
       1963
       +
       ```