diff --git a/.idea/vcs.xml b/.idea/vcs.xml
index bf8431e..0a294a1 100644
--- a/.idea/vcs.xml
+++ b/.idea/vcs.xml
@@ -3,5 +3,6 @@
   <component name="VcsDirectoryMappings">
     <mapping directory="" vcs="Git" />
     <mapping directory="$PROJECT_DIR$/lib/blt" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/lib/blt/libraries/parallel-hashmap" vcs="Git" />
   </component>
 </project>
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ecc22bc..5f1d528 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.25)
-project(Advent-Of-Code-2024 VERSION 0.0.5)
+project(Advent-Of-Code-2024 VERSION 0.0.6)
 
 option(ENABLE_ADDRSAN "Enable the address sanitizer" OFF)
 option(ENABLE_UBSAN "Enable the ub sanitizer" OFF)
diff --git a/include/day8.h b/include/day8.h
new file mode 100644
index 0000000..de9d50b
--- /dev/null
+++ b/include/day8.h
@@ -0,0 +1,24 @@
+#pragma once
+/*
+ *  Copyright (C) 2024  Brett Terpstra
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef DAY8_H
+#define DAY8_H
+
+void run_day8();
+
+#endif //DAY8_H
diff --git a/problems/day7/example b/problems/day7/example
new file mode 100644
index 0000000..87b8b25
--- /dev/null
+++ b/problems/day7/example
@@ -0,0 +1,9 @@
+190: 10 19
+3267: 81 40 27
+83: 17 5
+156: 15 6
+7290: 6 8 6 15
+161011: 16 10 13
+192: 17 8 14
+21037: 9 7 18 13
+292: 11 6 16 20
\ No newline at end of file
diff --git a/problems/day7/input b/problems/day7/input
new file mode 100644
index 0000000..362e126
--- /dev/null
+++ b/problems/day7/input
@@ -0,0 +1,850 @@
+37603097701038: 475 8 68 9 9 5 878 38 3
+740556: 418 9 4 4 3 1 9 7 5 12 9
+41216: 2 8 8 46 7
+30984320: 1 928 416 840 80
+31422162: 619 401 2 70 44
+6593961: 94 19 9 4 7
+243973: 7 230 6 97 3
+553110: 5 6 1 49 7 1 13
+569: 567 1 2
+26339: 928 66 19 26
+126563: 12 2 9 56 4
+909583: 92 5 38 59 89 5
+1870: 1 477 993 98 302
+716: 5 72 58 382 1 17 181
+59398283: 75 1 877 79
+8974471341: 9 860 8 3 99 8 552 9 61
+1547232: 83 266 70 950 822
+38491788: 4 3 18 4 81 4 5 2 2 23 89
+1802: 5 30 71 17
+21013: 42 236 2 8 8 337 836
+66233: 3 7 22 8 3 67 9 9 2 947
+127085000539: 488 6 31 7 7 80 2 5 6 5 9
+251952544: 223 407 347 8 8
+2276: 6 6 48 6 542
+20875394922: 6 7 379 9 49 9 52 7 4 1 4
+465821964765: 83 413 37 153 365
+75412: 19 49 81
+94979304: 7 6 19 424 4 72 7
+8497104: 13 9 8 77 627
+24090419534: 66 730 839 5 36
+3476088918: 693 19 66 4 918
+1726268485: 42 10 85 8 603 1 87
+2129276: 95 70 2 40 79 8 4
+26374687: 17 9 37 468 9
+3488425625: 45 66 764 655 44 926
+558272: 68 1 755 29 8
+2141581321406: 7 3 49 65 73 383 82
+539432: 2 9 8 9 45 5 3 4 8 7 5 8
+1143072190: 37 5 21 54 24 190
+5907370: 1 71 16 19 166 3 936 3
+983687: 538 676 4 81 23
+87247: 80 4 7 6 5 5 6 3 4 12 868
+275131752: 9 6 2 5 2 5 9 5 773 97 2 9
+55114: 104 21 437 445 44
+195608254: 313 977 623 579 4
+35682: 3 551 8 3 88
+18577: 1 81 8 3 393
+847228: 5 43 8 16 7 8 7 1 9 8 4
+2004290: 84 71 336 7 379
+104188904: 1 888 74 4 4 6 3 749 4 2
+2545518: 9 63 4 743 6
+27748: 76 201 35 2 9
+118738267: 92 117 568 3 23 267 1
+53889338763: 893 679 8 21 603
+617456785968: 892 57 59 7 2 8 1 759
+83155248103: 41 91 8 76 22 9 103
+63221: 8 79 2 1 1
+10592961: 6 25 3 6 2 8 8 7 7 6 7 638
+714288: 9 63 7 8 9 5 5 6 9 5 6 48
+4938839: 63 8 422 883 6
+189: 9 2 6
+36109644495: 8 9 54 6 6 39 1 9 7 7 1 15
+258032985: 314 30 824 8 985
+242881: 2 7 42 879 57 6 23 8
+3193460: 6 76 7 1 458
+5881: 4 9 39 945
+102489030: 633 45 7 1 514
+3157446: 203 717 2 343 832 2 3
+399084: 24 80 1 38 83
+1995: 8 990 77 900 20
+118513013: 592 5 1 65 2 10
+63992498039: 1 1 97 507 710 324
+181580636835: 158 4 7 81 6 898 2 8 3 3
+78363207: 17 5 9 8 7 29 8 695 20 7
+1999465200: 31 7 38 8 6 796 883 5 9
+928316: 5 491 1 2 169
+33984349: 3 177 64 347
+154485816: 935 2 557 296 752
+563402503: 5 203 413 7 23 6 32 5 2
+2059683822300: 8 27 99 56 4 57 85 5 71
+849046464: 2 494 14 931 2 8 76 14
+8565: 33 81 6 6 233 9 9 177
+104340802: 7 162 13 7 2 4 46 7 2 4 3
+186: 2 83 40 61 1
+12429168: 8 6 8 1 9 87 7 6 484 2 8 3
+6087: 2 3 70 80 7
+38059: 7 3 22 65 9 71
+251: 7 14 55 4 171
+210495791: 22 3 61 6 82 989 799 3
+26632279216: 6 260 2 3 7 2 2 7 92 16
+2460016: 788 15 7 26 8
+2868334: 842 5 2 605 316 2
+769280: 89 17 3 877 7 640
+1139092122: 825 428 8 138 379
+1401727: 2 7 72 721 100
+455284: 35 9 287 228 579 4 83
+47583019515: 661 214 580 39 4 719
+34664783: 1 7 46 62 269 79 69 83
+89259783411: 7 973 286 9 656 213 9
+2885334: 7 2 2 852 8 5 5
+3135979: 3 2 329 97 66
+13967912759692: 2 28 5 7 7 873 59 684 8
+4872: 2 9 5 397 1
+658438564: 5 331 2 442 9 6
+3967765560000: 2 2 72 5 825 978 683 5
+136674769: 615 751 747 64 5
+4708288121: 6 28 7 682 39 268 64 4
+50061: 42 65 467 92
+18311082920: 85 3 9 963 3 797 365 8
+98238: 3 80 5 7 57 263 4 970
+1258: 84 527 1 8 609 28
+13675051737: 2 6 1 767 883 5 6 7 7 20
+1756359: 862 26 38 9 5 506 339
+2978631: 6 496 2 5 33 98
+596544400: 932 1 64 400
+14367: 14 532 26 170 1
+311784916: 7 9 1 953 9 3 6 752 8 38
+29928: 6 7 179 3 1 727 684 8
+259603: 64 1 9 3 15
+10808: 607 594 9
+85669: 85 595 74 1
+216444: 47 7 48 7 2 9 557 9 7 68
+547308919: 9 89 7 7 61 79
+1213981: 8 671 14 5 33
+981706: 6 5 948 3 639 67
+208398892192: 645 457 101 5 313 7
+1617480: 7 4 91 4 4 979 3 2 85 9 8
+631844: 6 222 1 96 44
+506927: 3 21 6 3 759 609 851
+22395638525919: 87 41 4 670 28 7 6 3 61
+273672: 4 6 40 3 1 4 14 2 7 2 3 3
+1029600: 427 54 2 27 657 22
+139971080613: 6 614 31 6 7 3 78 29 9 2
+66750: 205 2 2 4 6 529 34 1 5 6
+450445574: 80 65 9 6 49 866 6
+654192369: 23 8 8 354 369
+17406970833: 2 967 9 970 830
+46004805786: 3 71 255 847 786
+124437: 1 16 8 392 42
+770782189: 185 66 97 59 40 7 9
+507937531: 108 771 610 1 273 1
+1244437447: 976 7 715 227 177 4
+251993780: 640 5 6 5 78 22 7 5 1 5 5
+740: 7 7 7 586 70
+142560703: 6 7 673 140 6 27 703 3
+89571802: 19 90 627 8 9 347 98
+60779110: 5 45 755 1 805 2
+54569648: 517 81 35 912 89 39
+2516469736: 83 585 297 3 97 39
+6206: 72 81 34 106 234
+1278426433: 9 3 93 2 1 20 6 8 95 2 6 4
+5617427760: 219 9 46 7 2 413 9 3 8 3
+97483: 9 5 5 6 422
+1049473: 68 9 19 896 3 18 5 5
+2947566: 8 245 653 94 3 4 93 9
+47057186926: 89 1 576 56 737 1 525
+34105869: 6 8 718 3 1 67 7
+47313281: 751 63 2 80
+11539723: 1 5 6 6 7 7 2 3 44 9 271 6
+81484356: 19 967 887 5 59 42
+487: 3 1 86
+163215: 6 6 23 9 65 3
+2336694416127: 33 33 5 1 34 8 801 8 7
+422604: 8 13 6 36 86
+2977: 513 682 2 2 585
+20180160050: 3 887 8 20 5 65 792 50
+1713136422449: 5 9 284 24 7 6 71 3 1 5 1
+287779207: 2 6 6 5 5 1 27 4 887 4 9 2
+273295994: 2 3 7 6 6 8 4 39 89 1 9 4
+3771666: 30 290 3 392 9 4 833 6
+9701916: 936 446 7 2 25 91 6
+48057093: 6 6 5 7 9 8 901 1 2 1 3 27
+54526042364: 871 626 14 423 64
+22942522: 120 1 3 89 189
+735564172: 74 497 4 711 5 51 566
+477307200: 4 358 1 823 405 82 38
+763004189: 876 871 8 177 7 5
+287175471: 66 87 1 8 6 5 5 469
+1203504640: 4 5 13 4 6 2 8 754 4 580
+17175078: 575 4 8 42 29 5 84 6 3
+21417984334: 2 880 704 83 36 16 8 2
+3648203204979: 7 40 986 640 99 6 5
+3406125185: 3 5 666 225 5 177 5
+26123: 31 841 52
+129910763: 8 9 7 7 27 8 2 386 147
+9414082548: 816 170 8 3 290 6 78
+10673869261: 1 8 55 9 67 5 84 94 2 58
+12815684528: 9 432 3 4 941 57 38 8
+4326214: 109 6 9 735 4
+15353686864: 65 60 830 5 4 41 3 38 8
+4348775: 1 6 9 171 973 726 7 5
+1678996509: 1 9 10 98 1 7 3 8 8 7 2 8
+45121182448: 3 9 8 47 11 81 72 2 726
+6243842: 5 84 7 41 94 1 5 9 16 4 1
+85614: 9 271 4 76 494
+1099842: 1 225 6 4 72 8 8 5 2 6 2 4
+10402268: 9 24 7 4 35 1 6 8 1 2 6 67
+1205494673459: 287 7 6 946 7 28 6 57 2
+20555736: 205 5 551 4 214 8
+7792509: 8 13 427 83 287 153 3
+8654: 2 6 77 776 6
+9673586: 7 4 7 106 507 2 4
+688051: 6 1 10 5 40 21 91
+1740: 7 1 1 6 7 293 19 6 7 5 7 8
+21242520: 4 74 85 36 89
+219447: 298 4 7 196 95
+2961: 9 8 12 3 367 2
+4927: 2 2 3 6 30
+24224396146: 8 7 3 6 1 2 814 1 8 19 4
+8362755197: 46 787 4 231 7 97
+37314475: 8 939 9 3 417 26 38
+391982515: 621 1 5 90 625 7 18
+89882: 7 1 110 3 8 88 90 7 7 12
+312984957: 64 4 6 81 957
+138666177: 430 5 7 9 3 8 7 5 4 27 6 9
+14273765439120: 26 93 16 3 2 904 530
+896184254: 234 3 3 24 1 9 6 59 2 7 2
+24882719: 9 4 7 678 2 9 5 4
+54833: 6 56 1 1 4 295 1 2 9 5 1
+2430: 73 2 5 1 29 9 4 5 9 46 3 5
+20943029: 812 798 1 130 29
+274065120: 7 452 5 9 2 4 9 19 7 6 3
+121510368003: 950 2 1 8 333 724 75 7
+9212: 1 16 24 53 98
+9280: 394 908 7 4 7 89
+2934360: 529 89 5 4 5 936
+37786777: 9 996 5 378 7
+3831853409: 53 2 602 231 501
+1408419: 66 475 867 3 55 66
+9067258: 13 69 8 672 56
+62112: 877 364 5 6 4
+8366650: 81 4 6 93 18 706 42 25
+213922985: 1 213 8 8 2 33 7 908 78
+32924: 7 7 3 4 6 6 8 6 9 26 3 63
+5431235659165: 9 126 9 4 551 3 9 7 1 6 7
+5848713: 8 9 243 8 9 4 963 39 1
+1050230513: 58 4 9 7 8 7 5 97 6 5 510
+2329854: 7 1 76 618 3
+5457846: 58 941 46
+10169595: 8 9 63 90 93 5 9
+7421390633: 7 8 4 3 2 5 58 163 6 3 6
+1301820: 7 50 61 526 729 4 51 6
+4847040: 3 1 46 3 861 4 73 45 99
+371: 35 2 4
+1430550: 5 632 19 75 6
+52933: 31 849 2 58 237
+15162724: 5 30 42 120 724
+144936079: 554 358 3 9 2 66 4 7 6 6
+648438787: 9 132 3 74 64 5 7 89
+9864016101: 56 244 8 411 1 610 4
+676: 28 252 384 3 9
+1583868: 769 9 3 26 78
+11740100: 8 92 15 84 190 74
+473103946: 9 4 3 6 2 4 8 7 19 7 2 6
+9475255: 80 7 3 23 931 9 698 2
+505930647771: 506 43 37 3 78 641 9 9
+52650: 8 2 8 398 47
+58731726417993: 774 39 9 482 256 1 76
+1663101: 664 55 57 25 303
+6854898026: 9 4 265 2 35 7 1 88 5 8 2
+153166816600: 661 2 80 4 114 3 254
+10598822214: 123 241 86 96 21 4
+112042247: 9 53 2 59 5 822 182 5 2
+1243387: 24 7 96 8 400 5 69 4 2
+124759377: 43 509 6 1 57
+38893544531: 1 403 46 964 531
+14511588: 87 7 220 4 688 97 7
+480984: 26 5 66 9 56
+3781: 373 1 7 40 2
+23158570: 21 86 2 4 2 4 6 9 9 5 3 42
+81019026: 8 1 64 21 7 98 4 9 4 8 4
+525347: 83 298 575 18 8 49 67
+42549020330: 8 61 5 773 9 94 88 58
+3462694879: 66 32 9 25 9 35 4 879
+26562: 9 968 59 83 3
+53984698740: 642 666 8 985 84
+98180544: 8 2 57 99 8 7 704 1 3
+19918182142: 12 5 84 3 2 654 38 8 7
+57543: 7 4 345 5 6 9 1 5 4 91 6 3
+1345805820: 248 525 692 6 3 540
+10814889802: 453 7 2 8 4 47 52 506 1
+560553237303: 9 7 8 2 34 9 514 5 3 9 3 6
+4437504: 87 340 85 9 963
+4927446: 47 2 2 31 43 4 9
+659489040: 929 1 8 90 21 6 62
+3008413: 4 746 6 18 413
+1124820843: 182 309 3 20 843
+4075: 838 103 4 14 300
+684608048: 68 407 52 89 1 913 8
+880277366978: 4 6 372 48 49 577 744
+28111: 863 228 307 4 5 55 96
+16971984: 4 969 5 52 13 9 479 68
+6464949128: 1 62 78 4 9 7 912 97 1 8
+1094383: 66 81 51 933 7 9 4
+268414693: 7 480 9 78 46
+64034145: 600 40 29 5 142
+89859376: 375 9 52 75 45
+1046447: 5 7 2 83 225 51 4 443
+64317982651: 568 75 1 7 98 2 6 38 13
+2354004228: 37 664 625 42 26
+15413: 10 6 51 7 3 5 63
+36924578416: 7 4 575 63 958 32 38
+465142300: 6 7 62 18 2 90 1 9 343 1
+18637559: 8 525 874 96 9 4
+264492561: 9 1 8 59 81 880 62 9 5
+1258416719: 277 649 81 7 7
+151604409383: 846 64 43 4 769 7
+128748146: 12 7 615 362 771 146
+2408916193: 209 4 90 89 2 106 8 59
+3356801: 5 92 3 7 27 9 9 9 2 54
+44008246: 79 8 9 89 3 5 5 8 172 71
+1492088700814: 3 70 7 4 8 2 54 1 7 8 72
+300857: 6 50 846 9 1
+8208920665: 817 7 31 920 667
+141351643884: 9 312 38 321 361 86
+1788474226065: 9 1 2 4 858 4 6 5 7 4 7 67
+12673536: 7 87 1 14 2 10 464 74
+21467: 7 3 4 58 9
+47473193045: 99 7 4 248 7 3 2 9 3 8 1 2
+5203644: 8 4 1 43 645
+1792: 957 407 431
+80997710: 4 1 804 972 5 12
+150420428: 2 6 9 7 310 6 4 4 5 42 4 1
+71077: 57 6 9 6 4 9 2 8 2 6 3 151
+16445351847828: 3 945 405 491 58 28
+36680: 4 93 4 7 6 7 7 8
+368128: 35 8 7 916 128
+101: 3 24 73 1
+215118528: 2 37 51 57 525
+64879: 72 9 76 1 2
+229680: 2 4 9 7 2 1 3 542 9 9 4 6
+10111024: 1 298 7 141 318 566 7
+3018508441: 766 394 46 8 437 4
+2076138: 11 8 93 83 13 8
+324945234: 3 112 971 485 6 1 5 78
+81794142: 67 5 730 15 94 140
+49254556: 50 794 21 1 4 310 516
+406347900: 7 573 49 70 70
+66243: 7 629 1 1 83 21 159 1 3
+40008300: 473 74 33 60 5 38 6
+72557: 42 343 88 1 4 9 3 5
+236186: 2 68 3 6 747 7 4 6 3 1 96
+151514: 3 9 7 2 8 823 9 4 1 34 5 7
+82128: 31 214 91 9 3 2 118
+1765: 710 4 63 44 944
+21945072619: 8 6 171 45 5 2 726 1 6
+4593: 60 2 64 333 4
+3162994299: 6 5 17 34 33 133 757 1
+335361557: 4 693 7 86 855 8 79
+60319234: 87 4 6 759 5 4 67 9 629
+79048669: 9 65 539 472 149
+154860670: 82 9 911 89 670
+1388465631: 9 8 541 6 8 99 5 3 837 3
+26640: 8 90 37
+48719682: 7 69 4 19 608 75
+5987936160: 5 903 742 791 2 6 80 3
+11084975: 283 69 518 7 79 90
+4182077: 91 4 846 6 64 9 317
+21220: 21 15 4 66
+25149: 6 419 9
+11268670235: 5 509 291 34 85 179
+27315960: 39 521 90 29 3 1 86 42
+141950: 4 727 6 28 5
+13721861: 48 62 7 46 60
+64328731: 4 60 6 9 14 7 37 190 3 1
+1256: 2 4 9 6 7 2 1 9 2 4 906 1
+5571225774: 4 6 8 5 1 4 6 2 7 99 771
+46797: 6 461 12 84 2
+25749: 1 2 3 9 476 2 1 8 2 16 9 7
+1389333440: 29 14 137 8 88 335
+20385: 8 57 66 376 4 993 728
+97308: 6 2 6 89 1 7 4 36 35 7 9 2
+621911: 8 183 76
+136033580: 7 9 8 9 98 1 5 7 88 7 90 2
+28209153538: 559 9 5 3 623 6 3 3 8 19
+1526266: 3 7 381 4 8 2 8 3 8 9 8 69
+885432740: 8 768 3 859 1 270 3 37
+13637160: 9 9 5 5 4 1 1 6 1 7 9 915
+1335398477: 38 915 856 14 72 5
+237006: 23 64 34 1 32 55 189 6
+1510: 6 2 66 8 919
+3766: 20 1 20 51 8
+2123684: 9 820 7 8 7 29 9 6 86
+11448746: 4 4 81 882 890 9 2 20 6
+242182: 34 8 697 99 289
+14229563: 9 8 728 80 7 43 86 2 3
+1045642353: 4 660 503 8 396
+22243681: 5 4 322 9 3 1 7 63 5 2 9 1
+185742: 652 46 871 94 6
+493: 27 2 17
+1661724: 1 6 6 1 71 9 7
+570389: 949 77 79 9 6
+438506889: 4 259 521 943 811
+1345877956: 553 1 5 8 9 82 39 9 8 3 6
+2258628: 774 6 4 4 52 850 9 1 3 6
+9900: 5 99 20
+1639: 18 9 51 86 83 93
+45459039: 7 19 903 63 84 8 8 378
+14804410320: 647 454 3 8 70 9
+245797934: 34 378 17 955 2 12 2 6
+202655002734: 71 94 313 25 26 9
+753018480284: 8 868 8 2 48 4 2 8 353
+55427: 78 475 3 9 7
+2857680701: 844 4 6 5 419 8 1 5 557
+931456: 4 6 3 1 8 204 9 54 4 8 38
+84004: 4 7 4 8 3 64 9 7 9 7 7 753
+203988: 338 7 8 120 6
+1242186: 4 73 950 182 4
+2956426: 733 448 8 73 9 241
+496: 48 1 9 4 60
+1411905084: 3 8 521 2 2 4 2 645 84
+469154: 1 305 66 268 23
+1609: 81 8 2 6 953
+2423194366519: 242 319 436 651 9
+294367700: 416 19 16 50 107 122
+258744: 6 410 92 35 16 29
+10820: 4 7 383 1 96
+4102518660376: 59 51 58 371 660 376
+81938326: 81 19 74 8 328
+10410341: 44 17 2 37 3 17
+4169992704931: 416 9 1 992 70 49 26 6
+29734: 55 8 769 22 540
+2785658: 84 186 13 589 254 58
+9808872679: 49 5 4 8 8 72 67 9
+1538: 486 18 9 3 1
+29695647956: 7 464 8 4 13 6 6 2 914 5
+89549706: 44 12 2 130 9 706
+15952: 2 28 9 51 5 8
+230927360: 592 5 92 848
+218010: 745 49 6 2 70 5 7 8 129
+85747671776: 134 1 6 9 7 816 2 974 8
+313731792: 4 62 9 746 708
+672020778: 3 8 442 3 4 105 63 778
+313295328: 3 884 53 7 3 837 92 6 4
+75523: 7 63 6 97 930
+337101953: 831 44 91 45 90 203
+3280416: 34 5 77 5 65 508 5 2 48
+6361: 69 26 7 4 92 8 1 210 62
+1151055520: 47 404 5 7 68 70 3 6 9 6
+952: 3 3 49
+3312641047: 3 376 5 2 9 68 4 8 5 2 2 9
+40848840: 3 8 275 6 41 8 8 27 545
+92145: 92 14 3 5
+8085171945: 660 7 5 4 85 6 35 2 1 7 5
+42541685607: 5 558 8 5 9 3 509 4 5 1 3
+768366963: 5 9 3 98 763 2 2 3 9 2 4 3
+1433823: 99 2 557 7 13 2 12
+17106391: 229 83 10 9 1
+4234: 787 5 6 7 76 4 8 7 9 686
+2382777: 579 693 7 207 9
+99460323: 78 302 2 654 4 3
+36216: 3 60 2 2 17 6
+44579482780: 31 72 2 5 8 2 541 780
+4725757: 325 73 18 16 710
+16075344: 412 424 7 37 92
+76280568533: 488 978 52 3 533
+4899847680: 701 40 4 560 52 6
+6619743: 805 4 94 43 87
+3010779299: 43 875 9 741 8 1 2 14
+107004040949: 370 6 482 40 947
+55145323511: 536 8 6 6 8 532 35 1 1
+337878256043: 972 436 145 586 797
+142460645: 63 56 6 673 6
+1280076: 43 7 5 50 9 17 2 669 1 2
+326253: 9 3 8 77 7 4 1 6 7 5 329 4
+139757: 639 8 108 2 2
+91146240: 3 92 320 3 344
+4487: 8 633 7
+11318310: 74 9 624 381 8 66 40 2
+304566: 95 44 357 614 22
+81730534: 817 305 31
+721: 6 6 44 9 1
+12125052828: 866 175 5 1 3 77 6 8 30
+1098: 9 237 7 833 4 7 1
+1911: 2 60 9 759 75
+151775549: 467 325 3 15 231
+55176046: 94 96 294 228 5 43 3
+18983481756: 41 463 481 753
+715501: 75 5 2 199 63 707 3 6 8
+6177608459: 1 2 5 1 4 55 8 8 456 1 5
+2698949722878: 1 8 808 50 6 287 878
+133: 7 6 12 5 8
+37026: 366 8 99
+136240016: 6 4 1 244 55 47 1 9 167
+5369118: 9 64 71 179 7 118
+176268044343: 4 8 642 9 7 8 5 739 6 6
+78852: 675 942 754 33 609
+479125212480: 939 461 2 51 479
+15891202555: 948 7 9 8 7 87 4 4 55 6 5
+4381286020: 1 812 92 784 5 247 4 5
+18243607: 1 1 814 1 401 2 4 15 2 6
+64943035538: 1 2 7 9 5 7 1 87 665 1 2 6
+1834955: 5 4 9 2 6 321 6 1 18 9 6 3
+5392524039: 281 8 2 953 6 26 2 932
+1660082: 1 282 373 42 465 5 7
+29899972: 278 92 962 2 84 7 837
+580484834115: 857 4 36 978 677 1 6
+7363035: 73 56 80 623 5
+12617458: 3 7 6 2 9 223 69 5 5 4 4 2
+137757: 73 96 3 9 57 734 5 3 47
+168919: 209 7 8 116 2
+5811278: 3 32 848 4 6 375
+32581: 7 6 2 46 183 7
+1814851: 3 864 7 3 90 61
+76873499110656: 725 6 66 4 183 67 864
+77468979555: 8 4 44 103 45 3 635 81
+117157: 2 203 9 3 4 8 161 5 5 1 1
+1212365896: 346 83 520 1 4 71 73 2
+887247764: 7 3 433 5 7 2 239 94 1 4
+4362519840: 4 9 3 5 9 158 4 7 6 415 4
+116: 4 7 2 16 4
+259255: 9 36 8 50 5
+361753664: 90 438 39 2 6 4
+8057: 67 738 7
+15068: 7 78 1 5 1 2 1 7 23 3 92
+650891342: 6 471 37 9 13 43
+1041894889672: 2 65 9 4 2 27 28 1 376 7
+2204983: 2 9 76 980 2
+3169152: 1 44 375 6 96 2
+1440198: 58 8 52 6 31
+2951360509168: 765 195 88 133 29 8
+1520477: 16 9 1 27 94 5 9 545 77
+6448585068534: 946 464 4 83 59 1 78 3
+132256560: 934 59 80 72 1 3 1
+23126094506: 642 39 1 143 7 6 8 36
+248: 8 6 5 64 7 2
+25769625: 2 576 961 9 6
+1350052: 6 5 25 4 3 5 1
+710825806868: 6 8 2 5 82 1 4 80 6 86 9
+94256767107: 7 3 54 9 8 629 4 636 4
+236578283: 9 365 8 9 4 4 1 2 57 5 1 5
+6091472: 25 6 1 96 5 4 5 3 435 7 2
+195800: 6 181 7 95 4 844
+6751740: 6 4 1 629 461 7 2 31 2
+89416249145698: 576 879 31 829 5 698
+79337108847: 670 1 3 269 9 1 10 44 9
+582075235: 585 5 995 2 2 34
+230: 7 55 85 6 77
+12364053: 2 39 199 4 6 8 2 8 7 8 9 4
+1315159874: 939 1 2 9 991 14
+172852: 2 873 33 3 1
+35: 3 1 4
+148833: 987 61 71 7 2
+2249277123: 6 348 23 36 9 5 764 8 3
+4098601236: 99 50 6 92 8 5 4 8 3
+397978707173: 29 547 628 8 7 383 6
+647776: 88 92 1 8 90
+300628727460: 413 51 954 3 727 6 8
+5633862247: 5 8 9 2 63 1 9 1 4 3 3 809
+16948: 6 58 93 2 2 932 2 6 987
+3323: 77 7 2 5 618
+762568: 95 99 60 3 568
+1632594179370: 9 3 597 9 4 7 9 9 85 1 7 6
+5190458: 56 8 3 20 8 91
+24412160799: 54 558 14 633 81 99
+5842625: 1 8 8 6 134 7 107 9 414
+9505: 3 7 2 74 3 4
+28360287: 9 6 60 7 13 4 9 2 1 23 9 3
+19162: 871 106 19 8 591
+1588039374: 4 4 5 560 1 99 4 2 9 246
+529061305: 1 7 34 2 3 2 823 3 8 302
+20470087211: 66 8 982 1 91 401 3 8
+271835242245: 628 3 38 7 763 9 7 9
+664206137805: 664 206 13 7 805
+252498840: 916 55 5 88 591
+3588031: 681 9 52 25 6 2
+1669227009751: 8 298 609 9 6 5 3 8 7 9 1
+8592: 9 3 8 9 6 321 69 1 8 424
+4520811: 645 78 9 7 288
+4588248: 4 2 8 2 31 7 58 5 2 2 434
+7308889: 4 9 51 84 824 62
+5650032516: 237 39 63 2 238 29 72
+1500632: 551 194 294 2 7
+290: 7 1 6 6
+6940554612: 57 9 1 9 1 302 8 9 4 69
+3053432256162: 9 7 367 1 8 40 98 6 9 9
+715300: 878 8 652 7 92 92
+472471839791: 66 964 158 336 47
+41638291: 744 86 9 5 1 931 91
+30729: 2 3 2 7 577 89 7 9 1 43
+68858066: 57 325 1 56 4 8 6 2 290
+11705: 15 28 5 40 45 147 75 5
+172805096: 4 14 4 4 8 9 4 5 5 90 4 5
+112486480056: 83 9 42 652 8 30 612
+2255867489: 63 6 2 698 8 508 8 9
+23553213402: 2 3 7 8 474 4 3 4 6 7 5 7
+4351515: 9 434 195 31 220 355
+55575: 39 52 4 3 195
+31683616245: 62 70 24 361 624 5
+49801178529: 56 2 916 9 983 9
+406343010: 5 44 5 2 283 1 4 71 6 7 1
+34560: 5 5 54 32 2
+24864: 7 4 336
+4879102: 85 287 2 97 5
+1311973: 19 75 92 1 97 5
+943673: 94 26 96 4 971 2
+16530764188: 826 2 9 1 764 17 7 11
+22116: 7 1 451 6 82 375 2 9
+3485422: 927 9 70 7 81 41 6 3
+259616: 3 146 63 77 40 90 76
+585664165: 91 4 2 538 81 6 41 6 3
+34707442220270: 96 7 624 8 492 3 4 129
+182543640: 529 11 2 345 1
+3536050: 149 1 95 66 247
+1835: 94 817 883 41
+1763497872: 6 5 8 785 7 3 5 3 63 432
+143326336: 286 4 2 3 9 5 9 7 11 4 76
+290569473: 628 873 53 15 3
+2628325988520: 2 4 6 6 587 634 1 4 445
+648000: 3 15 80 2 90
+123016: 6 473 43 39 1 942
+1135724897: 84 1 94 19 5 7 757 67
+456092182907: 68 8 9 5 4 7 662 900 3 7
+21430860636: 5 6 781 43 2 7 7 894 9 5
+14017959691: 4 9 596 48 3 36 691
+7770300: 7 9 40 7 8 1 9 4 747 7 3 2
+6985: 5 2 4 85 8 887
+80834112: 5 6 6 8 2 858 62 27 48
+44460048659: 78 950 6 48 658
+7045762059070: 945 7 398 73 7 745 5
+673: 28 1 18 7 347 4
+124573209: 6 2 8 3 9 6 904 31 9 7 5 8
+18588: 53 867 4 5 4 2
+4702617919: 36 1 20 2 110 7 848
+5631803: 7 2 8 21 8 348 91 971 1
+52: 14 26 3 5 4
+295216: 2 946 6 13 3
+46552414: 4 597 57 2 3 57 2 735 5
+1029156840: 88 6 793 2 1 4 9 387 83
+6564294: 894 200 20 9 5 4 3
+280394247303: 1 50 7 49 28 8 730 4
+2079328842: 753 3 8 276 44
+16362993602: 5 703 86 71 7 7 5 64 1
+302345215226: 232 130 74 521 52 26
+275983140164: 8 82 15 2 47 1 8 7 298 4
+4984851980: 8 989 4 45 7 3 34 3 2 9 7
+8550490687: 5 64 41 5 2 23 724 9 7
+2467: 97 136 5 87 45
+9169757847: 819 3 94 97 578 49
+2738: 913 1 8 917 899
+71836380: 1 17 7 710 803
+138108017589: 5 99 6 2 630 6 8 2 1 439
+25623376: 117 219 378
+297069679: 324 157 8 73 3 559
+109913: 7 28 560 46 6 14 87
+40829: 40 7 67 5 57
+1667028: 348 1 343 73 1 33
+3065830: 23 374 3 99 26 196
+8471: 72 4 46 733 93
+50578531: 43 31 53 806 26 16 3
+419077: 8 58 5 9 9 5 9 8 1 73 7 2
+8517255516: 5 358 79 1 6 27 9 9 33
+88228: 38 4 3 7 30
+10191450057: 486 5 4 50 5 1 6 37 699
+860342: 83 97 3 9 716 2 7 7
+1434303: 448 12 1 6 3 8 4
+3924124810: 9 4 783 2 5 6 2 6 29 6 4 7
+4731932: 966 5 8 2 609 2
+1625738985: 796 1 92 6 43 493 45
+2649: 1 7 58 2 68 4 19 8
+139784755: 5 57 96 61 7 37 55
+2371491360: 105 7 1 1 4 2 4 7 28 72
+673267: 1 66 3 260 7
+86530234: 1 8 359 5 73 48 471
+3173494: 8 35 53 953 6
+246481: 24 1 6 454 27
+337699982: 21 268 333 6 4
+3192168888: 3 79 9 927 6 5 1 6 2 8 9
+400754759: 52 6 64 69 7 38 4 5
+9874: 12 3 8 9 25
+2296980: 79 2 71 698 2
+15453444272: 10 6 77 741 28 74 61
+9234: 8 1 33 374 739 8 1 1 1
+7523285309497: 2 270 258 9 884 9 6 97
+355863040: 5 274 9 3 3 43 8 9 5 7 20
+6017896518: 6 6 3 84 989 1 5 9 1 520
+21463219: 3 3 1 1 7 7 51 2 2 3 219 1
+249972: 2 247 973
+9483335933505: 13 547 6 22 762 15 7
+14106336: 6 8 6 941 96
+47760167652: 9 64 3 25 38 1 9 2 1 650
+18510: 72 257 6
+3538458: 4 108 4 1 3 5 621 483 6
+422149: 6 78 902 6 7
+705149: 7 4 7 2 6 9 1 2 930 2 207
+1699: 856 75 57 704 7
+151628377: 3 4 51 7 694 8 51 7 66
+10663194: 28 21 4 316 57 85 5
+346421: 7 19 665 5 9 6 22 5 74 5
+39897: 1 14 350
+386536: 2 5 2 8 872 7 8 1 6 7 3 8
+2742606: 33 1 9 94 72 8 108 6 8
+127867660: 87 6 95 660 9 7 765 9 1
+1501660281: 8 278 2 7 99 8 9 421 9
+686904710453: 9 4 53 4 265 9 56 9 46 7
+204439326844: 8 6 8 2 3 177 98 9 3 2 3 1
+24776250: 7 20 18 6 8 6 2 5 7 625 6
+2679616647: 4 7 87 7 4 1 663 9 8
+700877440: 3 36 8 9 8 78 50 80 8
+326398: 43 6 2 640 1
+1105723872: 8 8 75 4 8 9 9 9 341
+18741772072: 7 284 575 8 4 2 5 7 8 73
+379608: 8 9 494 26 25 661
+377084225762: 873 85 899 1 97 7 6 8 1
+6303485511: 960 9 767 65 11
+1438340: 6 23 5 83 40
+81: 5 10 18 6 4
+2657422692: 459 7 213 9 6 57 3 39
+6920: 7 126 37 3 40 1
+53121623: 50 83 2 51 84 34 23
+3485684191: 47 5 57 8 5 8 37 84 5 6 1
+71324: 772 9 139 45 4
+280728128745: 2 5 7 3 1 55 8 6 2 8 1 742
+42670: 57 642 7 6 688
+445: 55 8 5
+3645021339: 138 3 79 1 779 1 1 3 33
+98354767: 8 58 2 228 8 48 903 7 7
+424631220019: 1 323 6 8 397 8 200 19
+11097232472: 754 9 7 9 64 3 7 8 11 6 4
+483210: 848 307 5 79 390
+12350: 6 9 791 8 6 7 455 9
+19649273: 529 54 9 53 7
+8937985012: 96 253 4 92 9 46 66
+520033939: 7 95 71 72 323 6
+18230126: 4 2 9 1 3 70 8 707 664 6
+87575079: 34 33 8 775 79
+134945: 32 8 74 76 7 685
+430796231254: 64 3 6 59 962 3 1 257
+672749200: 2 847 87 944 609 50 8
+287831: 8 798 51 7 89
+34510203129: 36 1 9 2 33 91 129
+363718885: 8 917 67 74 7
+40504689602: 64 36 97 62 89 593 6
+427764568: 8 6 60 961 88
+146169: 852 772 9 2 7
+3601167: 777 87 9 825 5 9 36
+87040: 569 3 8 6 6 7 7 1 3 9 4 1
+17405044: 229 38 5 2 44
+39960000: 1 22 483 86 5 5 60 45
+156876: 70 86 136 1 743
+38442: 71 53 6 1 5 1 737
+97301592: 355 331 9 92 9
+55987728: 540 8 3 9 1 480 49
+459742804: 7 28 91 80 4 9 4 7 1 1 3 1
+1703750: 7 8 421 500 250
+50094: 72 434 99
+26: 5 8 4 9
+357775357: 954 5 24 9 1 6 1 75 4
+23116: 1 39 7 2 41 131 2 8 15
+35248: 7 20 5 2 1 3 32 35 5 6 1 8
+39806299201031: 3 9 4 9 8 300 95 3 9 6 6 7
+298228891638: 6 656 730 8 7 9 28 5
+338458480290: 674 7 9 458 99 90 119
+17116: 1 148 5 417 9
+4591429453: 20 316 226 13 453
+2100824: 6 1 7 487 10 88 1
+57720: 5 2 2 8 5 4 92 1 696 65
+22637: 26 3 6 47 15 965 5
+1684311: 23 732 4 66 9
+305195: 606 503 3 9 362
+34398776: 8 1 3 8 914 7 7 307 84 8
+36383: 416 44 267 50 31
+28584: 312 3 89 41 508
+5958941381790: 72 6 700 16 8 5 1 82 5 3
+232007102155: 8 8 3 8 7 467 260 431 5
+6514959032: 892 46 73 566 463
+207: 5 4 9 2 7
+575418: 7 93 6 780 4 399 452 7
+768460: 555 213 3 56 104
+85723616832: 97 4 132 88 832
+2474805658: 6 11 1 76 5 8 56 1 1 60
+113698: 43 139 79 6 1 6 8 2 5 26
+159333: 5 17 3 27 565
+208467478761: 707 35 3 734 202 979
+191917: 7 9 218 682 275
+3076: 6 30 2 11 7 944 4 3 6 2
+8763802073526: 7 744 6 6 6 733 8 943 2
+87235: 6 56 6 3 9 179 7 9 58
+338625046: 4 3 75 774 47
+84974: 1 7 3 582 2
+2526047: 4 1 74 44 4 46
+17128812: 1 4 793 54 15
+205561: 59 6 1 8 4 3 8 9 1 6 568 3
+697394: 4 1 8 50 3 5 9 9 60 6 4 3
+33080892: 797 1 3 415
+938: 8 263 667
+1564661697: 720 68 776 66 1 697
+13768: 42 36 24 3 5 74 103 8
+49978: 28 1 30 846 64
+6601164080: 6 70 85 984 83
+1080: 5 8 88 8 64 84 26 98
+77002376: 2 629 167 2 61
+3657653370: 3 76 1 2 802 53 3 3 70
+1765971: 94 89 8 4 6 4 84 1 3 645
+1015930728: 1 269 87 4 341 8
+18207: 7 45 8 3 2 16 309
+663234557: 2 1 2 43 4 6 7 2 5 1 4 512
+14201135154: 761 6 2 814 311
+115600: 813 1 5 452 7 13 30
+1499214: 2 6 2 909 392 2 2 4 55 6
+54283169: 82 9 33 4 47 3 70 59
+1017935: 6 7 1 2 4 7 33 3 8 6 265 5
+43008: 1 7 610 30 4 4
+98971109: 3 6 8 2 4 14 1 6 37 6 1 83
+340101: 1 1 8 5 6 5 6 38 479 4 1 9
+213894723: 6 787 6 40 377 1 3
+1197424642: 316 556 998 976 640
+12147: 4 5 82 25 568 9 9 159
+102569344: 7 5 7 2 2 5 999 3 4 92 16
+1404: 19 48 84 5 9
+31269612: 45 7 9 8 2 90 8 86 9 1 2
+15043: 1 903 20 570 11 3
+75316777: 195 599 29 77 5
+4887133223: 888 5 443 547 6 5
+78470767: 92 17 8 89 803
+110668536002: 8 384 45 8 765 3 600 2
+90722459520: 2 8 4 946 8 210 201
+75961851: 7 6 2 5 4 9 883 875 93
+82073162111: 889 2 923 2 109
+91197457: 4 5 23 7 7 92 1 60 1 4
+189076: 2 2 6 542 743 2 73 6
+1123173960: 40 4 6 81 386 4 3 654 3
+3562: 166 8 2 8 3
+1725836521: 9 988 7 34 8 713 4 53
+229045: 73 1 308 112 3
+4389588: 3 9 4 6 38 8 994 7 6 42
+1081: 56 8 937 17 63
+582431925: 4 741 78 1 9 7 3 25
+170884: 4 2 7 9 6 6 89 147 9 1 7
+631904133: 65 992 98 71 62
+12762253763: 9 773 85 4 3 86 40 4 1
+341824972636: 4 5 6 2 4 6 5 6 5 525 15 9
+8670693800: 236 3 39 136 22 9
+12606163: 98 4 4 6 4 53 2 7 8 8 8 6
+850686497: 850 58 8 98 488 6
+1866247: 92 52 4 324 7
+16800: 1 80 6 5 7
+31933349: 94 1 249 38 50 1 49
+10758448637: 671 2 8 96 4 5 4 8 6 3 5
+7384: 11 5 4 45 1
+743720: 835 86 8 69 20
+25992842: 6 71 6 760 7 5 6 6 8 42
+14248281685: 7 206 241 95 501 7 79
+132997195: 6 319 409 72 195
+98010: 7 9 5 922 99
+17104242839121: 3 570 424 28 390 3 9 1
+12612741120: 7 95 504 784 8 6
+505239641290: 1 7 68 4 3 8 222 246 8 2
+8377857: 6 8 563 310 417
+1566246: 187 68 234 4 785 114
diff --git a/src/day7.cpp b/src/day7.cpp
index 230638e..d3ee8d5 100644
--- a/src/day7.cpp
+++ b/src/day7.cpp
@@ -20,6 +20,7 @@
 #include <vector>
 #include <limits>
 #include <algorithm>
+#include <stack>
 #include <blt/fs/loader.h>
 #include <blt/iterator/enumerate.h>
 #include <blt/iterator/iterator.h>
@@ -28,6 +29,183 @@
 #include <blt/math/vectors.h>
 #include <blt/std/assert.h>
 
+struct test_case_t
+{
+    blt::i64 calibration;
+    std::vector<blt::i64> values;
+};
+
+enum class operator_t
+{
+    PLUS, MULTIPLY, CONCAT
+};
+
+struct operation_t
+{
+    const test_case_t* test_case;
+    std::vector<operator_t> operators;
+
+    explicit operation_t(const test_case_t* test_case): test_case(test_case)
+    {
+        for (blt::size_t i = 0; i < test_case->values.size() - 1; ++i)
+            operators.push_back(operator_t::PLUS);
+    }
+
+    [[nodiscard]] bool valid() const
+    {
+        std::stack<blt::i64> value_stack;
+
+        for (const auto v : blt::iterate(test_case->values).rev())
+            value_stack.push(v);
+
+        for (const auto op : operators)
+        {
+            const auto a = value_stack.top();
+            value_stack.pop();
+            const auto b = value_stack.top();
+            value_stack.pop();
+
+            switch (op)
+            {
+            case operator_t::PLUS:
+                value_stack.push(a + b);
+                break;
+            case operator_t::MULTIPLY:
+                value_stack.push(a * b);
+                break;
+            case operator_t::CONCAT:
+                value_stack.push(std::stoll(std::to_string(a) + std::to_string(b)));
+                break;
+            }
+        }
+
+        return test_case->calibration == value_stack.top();
+    }
+
+    bool next()
+    {
+        bool carry = false;
+        for (blt::size_t i = 0; i < operators.size(); i++)
+        {
+            if (carry && operators[i] == operator_t::MULTIPLY)
+            {
+                if (i == operators.size() - 1)
+                    return false;
+                operators[i] = operator_t::PLUS;
+            }
+            else if (carry && operators[i] == operator_t::PLUS)
+            {
+                operators[i] = operator_t::MULTIPLY;
+                break;
+            }
+            else if (operators[i] == operator_t::PLUS)
+            {
+                operators[i] = operator_t::MULTIPLY;
+                break;
+            }
+            else if (operators[i] == operator_t::MULTIPLY)
+            {
+                if (i == operators.size() - 1)
+                    return false;
+                carry = true;
+                operators[i] = operator_t::PLUS;
+            }
+            else
+            {
+                BLT_INFO("I don't think this state is possible");
+            }
+        }
+        return true;
+    }
+
+    bool next2()
+    {
+        bool carry = false;
+        for (blt::size_t i = 0; i < operators.size(); i++)
+        {
+            if (carry && operators[i] == operator_t::CONCAT)
+            {
+                if (i == operators.size() - 1)
+                    return false;
+                operators[i] = operator_t::PLUS;
+            }
+            else if (operators[i] == operator_t::PLUS)
+            {
+                operators[i] = operator_t::MULTIPLY;
+                break;
+            }
+            else if (operators[i] == operator_t::MULTIPLY)
+            {
+                operators[i] = operator_t::CONCAT;
+                break;
+            }
+            else if (operators[i] == operator_t::CONCAT)
+            {
+                if (i == operators.size() - 1)
+                    return false;
+                carry = true;
+                operators[i] = operator_t::PLUS;
+            }
+            else
+            {
+                BLT_INFO("I don't think this state is possible");
+            }
+        }
+        return true;
+    }
+};
+
 void run_day7()
 {
+    const auto file = blt::fs::getLinesFromFile("../problems/day7/input");
+
+    std::vector<test_case_t> test_cases;
+
+    for (const auto& line : file)
+    {
+        test_case_t test;
+        auto data = blt::string::split(line, ":");
+        test.calibration = std::stoll(data[0]);
+        auto values = blt::string::split(data[1], ' ');
+        for (const auto& value : values)
+            test.values.push_back(std::stoll(value));
+        test_cases.emplace_back(std::move(test));
+    }
+
+    blt::i64 valid_test_case_sum = 0;
+
+    for (const auto& test : test_cases)
+    {
+        operation_t op{&test};
+        do
+        {
+            if (op.valid())
+            {
+                BLT_TRACE("Valid test case found! %ld", test.calibration);
+                valid_test_case_sum += test.calibration;
+                break;
+            }
+        }
+        while (op.next());
+    }
+
+    blt::i64 valid_test_cases_sum2 = 0;
+
+    for (const auto& test : test_cases)
+    {
+        operation_t op{&test};
+        do
+        {
+            if (op.valid())
+            {
+                BLT_TRACE("Valid test case found! %ld", test.calibration);
+                valid_test_cases_sum2 += test.calibration;
+                break;
+            }
+        }
+        while (op.next2());
+    }
+
+    BLT_INFO("test_case_sum %ld", valid_test_case_sum);
+    BLT_INFO("test_case_sum2 %ld", valid_test_cases_sum2);
 }
diff --git a/src/day8.cpp b/src/day8.cpp
new file mode 100644
index 0000000..c7c3232
--- /dev/null
+++ b/src/day8.cpp
@@ -0,0 +1,33 @@
+/*
+ *  <Short Description>
+ *  Copyright (C) 2024  Brett Terpstra
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#include <day8.h>
+#include <blt/math/log_util.h>
+#include <vector>
+#include <limits>
+#include <algorithm>
+#include <blt/fs/loader.h>
+#include <blt/iterator/enumerate.h>
+#include <blt/iterator/iterator.h>
+#include <blt/iterator/zip.h>
+#include <blt/std/hashmap.h>
+#include <blt/math/vectors.h>
+#include <blt/std/assert.h>
+
+void run_day8()
+{
+}
diff --git a/src/main.cpp b/src/main.cpp
index dadd448..c347ead 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -7,6 +7,7 @@
 #include <day5.h>
 #include <day6.h>
 #include <day7.h>
+#include <day8.h>
 
 int main(const int argc, const char** argv)
 {
@@ -46,6 +47,7 @@ int main(const int argc, const char** argv)
         run_day7();
         break;
     case 8:
+        run_day8();
         break;
     default:
         BLT_INFO("%d is not a day", day);