From 2b400c1d7a78dc195895757732afd713f188d1e3 Mon Sep 17 00:00:00 2001
From: Mark Bebawy <markbebawy0@gmail.com>
Date: Sun, 14 Dec 2025 14:27:16 +0100
Subject: [PATCH] Solutions day1-day3

---
 mark/day1/example.txt         |   11 +
 mark/day1/input.txt           | 4571 +++++++++++++++++++++++++++++++++
 mark/day1/part1.rb            |   29 +
 mark/day1/part2.rb            |   53 +
 mark/day2/example.txt         |    1 +
 mark/day2/input.txt           |    1 +
 mark/day2/part1.rb            |   57 +
 mark/day2/part2.rb            |   74 +
 mark/day3/example.txt         |    4 +
 mark/day3/input.txt           |  200 ++
 mark/day3/part1.rb            |   49 +
 mark/day3/part1_prep_for_2.rb |   67 +
 mark/day3/part2.rb            |   91 +
 13 files changed, 5208 insertions(+)
 create mode 100644 mark/day1/example.txt
 create mode 100644 mark/day1/input.txt
 create mode 100644 mark/day1/part1.rb
 create mode 100644 mark/day1/part2.rb
 create mode 100644 mark/day2/example.txt
 create mode 100644 mark/day2/input.txt
 create mode 100644 mark/day2/part1.rb
 create mode 100644 mark/day2/part2.rb
 create mode 100644 mark/day3/example.txt
 create mode 100644 mark/day3/input.txt
 create mode 100644 mark/day3/part1.rb
 create mode 100644 mark/day3/part1_prep_for_2.rb
 create mode 100644 mark/day3/part2.rb

diff --git a/mark/day1/example.txt b/mark/day1/example.txt
new file mode 100644
index 0000000..5b04997
--- /dev/null
+++ b/mark/day1/example.txt
@@ -0,0 +1,11 @@
+L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82
+
diff --git a/mark/day1/input.txt b/mark/day1/input.txt
new file mode 100644
index 0000000..03ee22a
--- /dev/null
+++ b/mark/day1/input.txt
@@ -0,0 +1,4571 @@
+L4
+R49
+L25
+R16
+R45
+R41
+R19
+R20
+R22
+L16
+R42
+R5
+L29
+L5
+R1
+R6
+R30
+R5
+R11
+R44
+L13
+R28
+R36
+R45
+L22
+L6
+L39
+R16
+R20
+L12
+R2
+L29
+L42
+L22
+L7
+R13
+L38
+L26
+L10
+R35
+R30
+R10
+R13
+L37
+L3
+L48
+L12
+R20
+L16
+R87
+R82
+R18
+L76
+L94
+R95
+L25
+R77
+R23
+L28
+R28
+L65
+R65
+L5
+R60
+R33
+L88
+L67
+R96
+R71
+L57
+L70
+L7
+R72
+L88
+L22
+R59
+L87
+L52
+L35
+R87
+L61
+R83
+R82
+L57
+L19
+L28
+L55
+R55
+L54
+L5
+L36
+L34
+L71
+L21
+L1
+R22
+R1
+L81
+R89
+L3
+R3
+R33
+R53
+L43
+R297
+R12
+L61
+R49
+R851
+R22
+L22
+R57
+R95
+R84
+L44
+R77
+L52
+R183
+R85
+L40
+R55
+R85
+L485
+L62
+L90
+R81
+L29
+L56
+R49
+R7
+R57
+R56
+L13
+R61
+L61
+L90
+L35
+R28
+L95
+L73
+L14
+L21
+L79
+L4
+R67
+L84
+R69
+R23
+L13
+R21
+R611
+L22
+L92
+L86
+R5
+L79
+R63
+R85
+L263
+R27
+L56
+R83
+R93
+R35
+L67
+R69
+L67
+L18
+R89
+R17
+L27
+R15
+L22
+R30
+L17
+R12
+L18
+L46
+L54
+R48
+R18
+R96
+L62
+R40
+R60
+R5
+R16
+R79
+L99
+L1
+L53
+L47
+L33
+L85
+L501
+R808
+R511
+L26
+R126
+R373
+R27
+L812
+L29
+L85
+L74
+R88
+L88
+L929
+R929
+L32
+L68
+L43
+L68
+R65
+L71
+R75
+L25
+L44
+L93
+R15
+R89
+R88
+L88
+L793
+R93
+R1
+R386
+L53
+R503
+L37
+R41
+L64
+L813
+R949
+L37
+L76
+L28
+L354
+L86
+R39
+L871
+R61
+R22
+R17
+R88
+L78
+R17
+R73
+R48
+R11
+R60
+L19
+R531
+R49
+R44
+R667
+R77
+R532
+R799
+R1
+L84
+L16
+L40
+R49
+L89
+R80
+L735
+L365
+R44
+R32
+R79
+R952
+R893
+L21
+L36
+R157
+R53
+R47
+R30
+L30
+R28
+L49
+R22
+R43
+R45
+L89
+R116
+R90
+L6
+L11
+L7
+R62
+L671
+R31
+L8
+R4
+L77
+R77
+L32
+R376
+R956
+R19
+L91
+L589
+L484
+R68
+L453
+L24
+L46
+L59
+L41
+R876
+R24
+R601
+R52
+R47
+L20
+L56
+L4
+L20
+R57
+L799
+R42
+L35
+L36
+L29
+R93
+R21
+L14
+L14
+R496
+L982
+L10
+R39
+L29
+L118
+L13
+L69
+R3
+R99
+R98
+R769
+R95
+R160
+R558
+L82
+R88
+L35
+R30
+L65
+L217
+R67
+R24
+R51
+R30
+R4
+R52
+R165
+L694
+R53
+R47
+L49
+L51
+R60
+L95
+L65
+L94
+R94
+L8
+R7
+L85
+L10
+L895
+L35
+R948
+R14
+L36
+R17
+L817
+L52
+R991
+L57
+R23
+R11
+L57
+R70
+L78
+R60
+R67
+L78
+R59
+R494
+L53
+L306
+R83
+L77
+L95
+L33
+L88
+L82
+R98
+R80
+L80
+L57
+L43
+L688
+L12
+L113
+R94
+L81
+L65
+R8
+R637
+R85
+R14
+R169
+R2
+L23
+R32
+L63
+R6
+L30
+L32
+R60
+L64
+R67
+R27
+R71
+L784
+R85
+R147
+R48
+R3
+R83
+R196
+L63
+R5
+L21
+L64
+R254
+R10
+R51
+R49
+L32
+R93
+R39
+R95
+R45
+L89
+L51
+L97
+R348
+R70
+L17
+R96
+R471
+L96
+L75
+L48
+R59
+R89
+R335
+L35
+L59
+R77
+L718
+L60
+R60
+L65
+R65
+R53
+L53
+R23
+R68
+L643
+R23
+R99
+R835
+R434
+L86
+R90
+R32
+R25
+L94
+L351
+L41
+L33
+L81
+L37
+R37
+L749
+L49
+R29
+L51
+L13
+R13
+L80
+L58
+R58
+R76
+L98
+L78
+L17
+L60
+R77
+R409
+R334
+L43
+L74
+L3
+L28
+L48
+R53
+L88
+L90
+L61
+L61
+R99
+R5
+R31
+L326
+L33
+L76
+R17
+L29
+L88
+L13
+L61
+L26
+R17
+R62
+L79
+R12
+R88
+R46
+R84
+L30
+R58
+L938
+R80
+R8
+R64
+L72
+L42
+L414
+L11
+L233
+L31
+L169
+R52
+L52
+L43
+L80
+L377
+R20
+R80
+L70
+R70
+R47
+L49
+L10
+L83
+R95
+R22
+R59
+L81
+L120
+R20
+L786
+R80
+L72
+L85
+L128
+L809
+R39
+R57
+R4
+L57
+L35
+R92
+L93
+R25
+R68
+L71
+L544
+L783
+L11
+L91
+R377
+L77
+R10
+L964
+R6
+L76
+R324
+L15
+R82
+L72
+L66
+R128
+R875
+R86
+R82
+R873
+L81
+L67
+L86
+R23
+R61
+R77
+R15
+R47
+R88
+L59
+R9
+L19
+L81
+R56
+L86
+L15
+L955
+L39
+L744
+R83
+R93
+L93
+R7
+R87
+L32
+L62
+L45
+L50
+R3
+R92
+L485
+L15
+L70
+R276
+L76
+L66
+R58
+L12
+R90
+L14
+R41
+R78
+L14
+L91
+L93
+L5
+L319
+L90
+L293
+R22
+R172
+R6
+R31
+L45
+R88
+R48
+L95
+R47
+L94
+L15
+L8
+R64
+L21
+R10
+L10
+L73
+L69
+R33
+R7
+R282
+L80
+R7
+L2
+R19
+L63
+R39
+L955
+L27
+R718
+L39
+R218
+L915
+R10
+L83
+R73
+R70
+L70
+L94
+L19
+R55
+R57
+R1
+R67
+L2
+R35
+R48
+L948
+R846
+R54
+R1
+R99
+L86
+L14
+R55
+R71
+R44
+L47
+L484
+L739
+R3
+L56
+L53
+R6
+R11
+R740
+L37
+L57
+L89
+R34
+R20
+L91
+R73
+R10
+R84
+L41
+L57
+L16
+L923
+R39
+L25
+R757
+R268
+L23
+L856
+L57
+L96
+R32
+R52
+R999
+R84
+L616
+R81
+L87
+R90
+R97
+R25
+L68
+L57
+R271
+R29
+R41
+R959
+R91
+R9
+R48
+R52
+L14
+R84
+R61
+R55
+R87
+L59
+R86
+R17
+L70
+R141
+R12
+R64
+L701
+R937
+R17
+R85
+L75
+L436
+R9
+L2
+L206
+L3
+L70
+R82
+L1
+L762
+R96
+L34
+L29
+R49
+L20
+R15
+R221
+R77
+R615
+R72
+L71
+R99
+R88
+R84
+R83
+L63
+L476
+R97
+L75
+R371
+R56
+L98
+L69
+L26
+L51
+L49
+R55
+R17
+R6
+R330
+L49
+L90
+L69
+R39
+L939
+R56
+L48
+R92
+L83
+R36
+L21
+R68
+L717
+L62
+L66
+R27
+R595
+L15
+L34
+R730
+L80
+L78
+L129
+L15
+R5
+R34
+R63
+R20
+L28
+L50
+R29
+L22
+L7
+L903
+L9
+R12
+L85
+L15
+L46
+L54
+R13
+R92
+R11
+L987
+R71
+R80
+R23
+R938
+R58
+R31
+R70
+L26
+R26
+R790
+R310
+L11
+R11
+R38
+R413
+R49
+R43
+L343
+L789
+R50
+L4
+R43
+R83
+R74
+R23
+L80
+R72
+R22
+L86
+L8
+R3
+R23
+L926
+R890
+R501
+L61
+L30
+L4
+R34
+L54
+R24
+L78
+R96
+L90
+L28
+R64
+R936
+L56
+R89
+R40
+L27
+R54
+R43
+R37
+R50
+R770
+R57
+R43
+R16
+L1
+L15
+R20
+R404
+L65
+R241
+L90
+L10
+L6
+R6
+R564
+L854
+L75
+R94
+L58
+R29
+L753
+L31
+L16
+R18
+R982
+R11
+L13
+R2
+R18
+R82
+R87
+R58
+R12
+L15
+R63
+R344
+R93
+R88
+L967
+R37
+R44
+L62
+L82
+R76
+R80
+L51
+R56
+R39
+L656
+L44
+R11
+R89
+L96
+L4
+L31
+L69
+R39
+R61
+L61
+L64
+L61
+L6
+R872
+R6
+R131
+R60
+L24
+R30
+L98
+L83
+R86
+R471
+R62
+L99
+R77
+L38
+L45
+L11
+L7
+R2
+L52
+R89
+R98
+L70
+L94
+R51
+R89
+R44
+L55
+L70
+L30
+L76
+L907
+L34
+L39
+L818
+L226
+L75
+R32
+L390
+L941
+L738
+L93
+R90
+R73
+R42
+L34
+R134
+R10
+L60
+L50
+R28
+L46
+L66
+L581
+R465
+L76
+L42
+R201
+R84
+L96
+R290
+R68
+L7
+R49
+R44
+R734
+L49
+L82
+L417
+L1
+R731
+R85
+R284
+R50
+R74
+L322
+R27
+L15
+L14
+R54
+L654
+L65
+R965
+R77
+L50
+R173
+R79
+R521
+R2
+R28
+L30
+R472
+L72
+R38
+R49
+L87
+R49
+R99
+L48
+R9
+R91
+R62
+R538
+R27
+L621
+L84
+L15
+L75
+L32
+R68
+L55
+L149
+L964
+L94
+L606
+L576
+L42
+L79
+R77
+R20
+L11
+R11
+L27
+R42
+L72
+L343
+R46
+R990
+L334
+R98
+L38
+R485
+L47
+R845
+L45
+R14
+R495
+R91
+R63
+L73
+L49
+L924
+R14
+L4
+R23
+R950
+R829
+R6
+R81
+L86
+R70
+R89
+R28
+R34
+R49
+L88
+R925
+L19
+R367
+R25
+L7
+R14
+R83
+R50
+R868
+L59
+R42
+L1
+R914
+L97
+L61
+L56
+R38
+L60
+R94
+R389
+R39
+L12
+R69
+L66
+L91
+R18
+L91
+L27
+R24
+R76
+L940
+L89
+R7
+L86
+R65
+L57
+L70
+R38
+R81
+L49
+R368
+L568
+R36
+R76
+R19
+L31
+R39
+L86
+L953
+R2
+R45
+L204
+R57
+L33
+L63
+R509
+R87
+R93
+L93
+R14
+R48
+R38
+R75
+L75
+R821
+L98
+R49
+R3
+R225
+R30
+L23
+L37
+L86
+R28
+L612
+L68
+L32
+L93
+L98
+L9
+R68
+R660
+R56
+L84
+R74
+L99
+R25
+R26
+R47
+R517
+L90
+R70
+L48
+R50
+L34
+R62
+R46
+R341
+R88
+L575
+L965
+L193
+L20
+R78
+L97
+R17
+L702
+L46
+L1
+R29
+R78
+R52
+L15
+R85
+R54
+R46
+L74
+L26
+L795
+R736
+L8
+L63
+R289
+R87
+L146
+R627
+R13
+L94
+L56
+L92
+L90
+L285
+L39
+L284
+L31
+L369
+L69
+L31
+L457
+R12
+R45
+L13
+L87
+R81
+R19
+R32
+R87
+R67
+R887
+R127
+L658
+L23
+R93
+R88
+R44
+L44
+R78
+L35
+L43
+L30
+R30
+R45
+R93
+L64
+L74
+L65
+L635
+L75
+L25
+L248
+L52
+L59
+L41
+L790
+R82
+L92
+R11
+R35
+L1
+L60
+R715
+R98
+R702
+R172
+L72
+L65
+L96
+R75
+L22
+R846
+L38
+R79
+L79
+R78
+R22
+R36
+R664
+L30
+L70
+L471
+R71
+L17
+R46
+L61
+R575
+L92
+R31
+L9
+L855
+R853
+L71
+L24
+R81
+R38
+L1
+L1
+R446
+R61
+L42
+R50
+R604
+L912
+R68
+L68
+L50
+R50
+L376
+L25
+L258
+L77
+R83
+R66
+L81
+R78
+R190
+L759
+R45
+R66
+L39
+R11
+L67
+R43
+R83
+L83
+R48
+L48
+L14
+L389
+R45
+L30
+L82
+L991
+R66
+L27
+R53
+L31
+L723
+L77
+L42
+R98
+R444
+L528
+L72
+L72
+R73
+L60
+L78
+R315
+L78
+L75
+R194
+R818
+R63
+L272
+R972
+L964
+L41
+L1
+L94
+R36
+L68
+L606
+R72
+L18
+R431
+L626
+R79
+R665
+R552
+L32
+R40
+L1
+R299
+R77
+L53
+L45
+R98
+R29
+L54
+L61
+R73
+R613
+L60
+R282
+L49
+L273
+L88
+R54
+L71
+R5
+R59
+R41
+R36
+L8
+R69
+L97
+L72
+L28
+L23
+R23
+R12
+L420
+L92
+L29
+R17
+L71
+R61
+R78
+R8
+L82
+L82
+R54
+R725
+R521
+R8
+L983
+R21
+R54
+L42
+R55
+L13
+R16
+R684
+R10
+L610
+L27
+R27
+L21
+L37
+L78
+R49
+L13
+R73
+R62
+R53
+L88
+L92
+R57
+L65
+R98
+R2
+R25
+R75
+R14
+R27
+R759
+R6
+L19
+L31
+L719
+L167
+R76
+L84
+L63
+R1
+R89
+R22
+R125
+L92
+L44
+R1
+L94
+R39
+R17
+L63
+L15
+R313
+R29
+R10
+L237
+R15
+R8
+L62
+L28
+R602
+L423
+R35
+L47
+L28
+R28
+R13
+L691
+R79
+L1
+R17
+R83
+R16
+R56
+L750
+R78
+L49
+L75
+L33
+R57
+L763
+L7
+R59
+L1
+R512
+R53
+L53
+L55
+L45
+L30
+L70
+L76
+R855
+L579
+L22
+R24
+R98
+R24
+L24
+R329
+R20
+L501
+R48
+L36
+L88
+L80
+R58
+R6
+R44
+R36
+R64
+L54
+L548
+R2
+R53
+L53
+L59
+R159
+R1
+R80
+L88
+L72
+R94
+L44
+R90
+R39
+R61
+L479
+L790
+L792
+L95
+L112
+R50
+L43
+R93
+R307
+R39
+L39
+R992
+R8
+R67
+R735
+L2
+R56
+L86
+R179
+R22
+L919
+L21
+L634
+L97
+R119
+L26
+R797
+R3
+L88
+L5
+R49
+L57
+R8
+R17
+L17
+L48
+R222
+R26
+L172
+L54
+R65
+R61
+L90
+L20
+R10
+L464
+R31
+L4
+L46
+R14
+L17
+R86
+R15
+R85
+R1
+R14
+L109
+L12
+R629
+R89
+L12
+L261
+R5
+R56
+R52
+L52
+R91
+R25
+R84
+R84
+L38
+R363
+L66
+L96
+L9
+L38
+R57
+R77
+R3
+L37
+L1
+R56
+L494
+R28
+L30
+R259
+L64
+L54
+R74
+L374
+R37
+L78
+L59
+L59
+L933
+R92
+L97
+L603
+R52
+L87
+R4
+R59
+L29
+R1
+R92
+R29
+R12
+L24
+R337
+R49
+L99
+L57
+R961
+R69
+L49
+R80
+R1
+L30
+R141
+R788
+L30
+R30
+L371
+R71
+L20
+L680
+L70
+R70
+L595
+R95
+R25
+L25
+L66
+R54
+R12
+R54
+R99
+L11
+R95
+L37
+L78
+R178
+L798
+L2
+R354
+R78
+L96
+R64
+L14
+L86
+R44
+L26
+R82
+L12
+L88
+L98
+L14
+R1
+R68
+R11
+R95
+R43
+R94
+R54
+L46
+R92
+R67
+R33
+R591
+L57
+R77
+L27
+R16
+R11
+L3
+L8
+L7
+L182
+R76
+L87
+L34
+L93
+R73
+R98
+R49
+L93
+L19
+L881
+R76
+R24
+L57
+R925
+R79
+R13
+R658
+R82
+R84
+L41
+R357
+R13
+L550
+L26
+L3
+R66
+L59
+L44
+L760
+R63
+L686
+L14
+R96
+R19
+R85
+L88
+R88
+R36
+L13
+L473
+L5
+R45
+L90
+L261
+L57
+R37
+R81
+R27
+R81
+R92
+R37
+L3
+R66
+R857
+R81
+L38
+L277
+R15
+R62
+R38
+R62
+R57
+L57
+L28
+R82
+R46
+R59
+L78
+L78
+L3
+R44
+R45
+R84
+R512
+R12
+L27
+L7
+R83
+R86
+R68
+R27
+L30
+R3
+L45
+L66
+L789
+L85
+R138
+L743
+L310
+R95
+R5
+R53
+R24
+R91
+L93
+L75
+R85
+L95
+L90
+R61
+L61
+L35
+R35
+L131
+R40
+L388
+R7
+L28
+R33
+L33
+L62
+L698
+L40
+R363
+R670
+R365
+L98
+L114
+L79
+R63
+R42
+R104
+L66
+R50
+L62
+R16
+L54
+R55
+R469
+L38
+R14
+R92
+R88
+L80
+R33
+R67
+R29
+L29
+R702
+L2
+R40
+L48
+R8
+L55
+R55
+R8
+L21
+R65
+R91
+L824
+R95
+R817
+R21
+L18
+L6
+R78
+R46
+R98
+L97
+R55
+R312
+L74
+R654
+L33
+L75
+L92
+L16
+R59
+L94
+R917
+R69
+L38
+L23
+L74
+R15
+R456
+L44
+R85
+R288
+R98
+R721
+R61
+L44
+L31
+L98
+L25
+R81
+R37
+R22
+R74
+R53
+R77
+L26
+R74
+L74
+L37
+L33
+L52
+R34
+L218
+L96
+L12
+R807
+R32
+L25
+L86
+L8
+R573
+L79
+L83
+L78
+L39
+R643
+L32
+R89
+R87
+L58
+L872
+R26
+R14
+L97
+R99
+L99
+R42
+R58
+R2
+L67
+R90
+R75
+R69
+R31
+L57
+L643
+L543
+L57
+L52
+L85
+R31
+L74
+R72
+R8
+R7
+R64
+R9
+R95
+R25
+R31
+L64
+R681
+R52
+R84
+L84
+L71
+L17
+R639
+R49
+L35
+L27
+R53
+L81
+R51
+R29
+L90
+R41
+L51
+L60
+L938
+L698
+L381
+R87
+R26
+L90
+L3
+R27
+R85
+L45
+R10
+L17
+L93
+R314
+L14
+L5
+R129
+L2
+L22
+L42
+L28
+R70
+L46
+L43
+R47
+R81
+R8
+L827
+L603
+R49
+L46
+L73
+R383
+R879
+L34
+L12
+R606
+R11
+L3
+R74
+R23
+R13
+R71
+R42
+R41
+R7
+R39
+R274
+R39
+R31
+L85
+R54
+L14
+R276
+R582
+L44
+L839
+L87
+L74
+R75
+R20
+R5
+L955
+L6
+L23
+L16
+R3
+R60
+R28
+L98
+L61
+L133
+R388
+L90
+L40
+L57
+R64
+R368
+L32
+L80
+R380
+L70
+R12
+R876
+L794
+R19
+R683
+L25
+L45
+L99
+L363
+L75
+R81
+R70
+R77
+R53
+L3
+L26
+R29
+R63
+R93
+R75
+R69
+R43
+R57
+R25
+R83
+R4
+R79
+R715
+L6
+L95
+R76
+L81
+L36
+L64
+L91
+R91
+L130
+L66
+R83
+L87
+R479
+R66
+R55
+R26
+R74
+L534
+L50
+R84
+R31
+R19
+R71
+L643
+R83
+L74
+L87
+L6
+R89
+R17
+L57
+R57
+L94
+R94
+R66
+L687
+R21
+R6
+R22
+R92
+R80
+L542
+L13
+R55
+R69
+R31
+R69
+L343
+R86
+L134
+R24
+L2
+L95
+L11
+L70
+R65
+R2
+R10
+R811
+R88
+R55
+L16
+L439
+L82
+L88
+R533
+R13
+R24
+R73
+R42
+L30
+L804
+R97
+R622
+R310
+L66
+R56
+R95
+L89
+L6
+R13
+R87
+R10
+L10
+R24
+L66
+R442
+L30
+R38
+R46
+R46
+R9
+L409
+L47
+L89
+R515
+R13
+R48
+R40
+R98
+R22
+L88
+R88
+R90
+L20
+R30
+L34
+R24
+R10
+R9
+L33
+R38
+R54
+R329
+L97
+L47
+R45
+L53
+L15
+R89
+R74
+R5
+L806
+L892
+R14
+L22
+L92
+R20
+R41
+L78
+L83
+R47
+L47
+L52
+L830
+R13
+L31
+L2
+R90
+L776
+L428
+R16
+R91
+L91
+R79
+L55
+L45
+R12
+L91
+L25
+R299
+L55
+L150
+L48
+R98
+L19
+L86
+R46
+R40
+R26
+L454
+R7
+L946
+L33
+L19
+L981
+R7
+L7
+L51
+R51
+R97
+R731
+R59
+L25
+L18
+R56
+R69
+L468
+L65
+L36
+L66
+R66
+R38
+R62
+L13
+L79
+L608
+R90
+R80
+L74
+L25
+L17
+L16
+L26
+R88
+R12
+L12
+L50
+R22
+R89
+R7
+R665
+R467
+L86
+L83
+L31
+R91
+R9
+L31
+L69
+R11
+L6
+L605
+L7
+R99
+R8
+L76
+L982
+R53
+L92
+R92
+R56
+R49
+R90
+L90
+R82
+L882
+R859
+L8
+L201
+L34
+L69
+L47
+L25
+L73
+L75
+R25
+R690
+R44
+L9
+L77
+L238
+L62
+L83
+R27
+L89
+L355
+R78
+L538
+R81
+L69
+L61
+R809
+R89
+R11
+R393
+R292
+L96
+L2
+L62
+R475
+R50
+R41
+R9
+R28
+L40
+L49
+R25
+L31
+L372
+R39
+R672
+R32
+R96
+R41
+L941
+L18
+R76
+L58
+L59
+R429
+L370
+R55
+R87
+R86
+R72
+R29
+R71
+L92
+L462
+L97
+R61
+R90
+L39
+L61
+R93
+L39
+R23
+R23
+R40
+R360
+R769
+L69
+R3
+L757
+R18
+L5
+R74
+L14
+R76
+R82
+L436
+R50
+L91
+L66
+R66
+R269
+R92
+L61
+R83
+R758
+R2
+L43
+L575
+L922
+R21
+L50
+L70
+R96
+R38
+R62
+L85
+R75
+R10
+R129
+L30
+L99
+L92
+R592
+L13
+R30
+R56
+R29
+L27
+R94
+R65
+L22
+L95
+R83
+L682
+R71
+L22
+L1
+L77
+L37
+L3
+R51
+R59
+R41
+L93
+R85
+L90
+L2
+L18
+R60
+R58
+R90
+R10
+R6
+L81
+L25
+R5
+R45
+L15
+L35
+L37
+R31
+L391
+L29
+R313
+L388
+L99
+L25
+R8
+L48
+R65
+L88
+R70
+R68
+R50
+R257
+R43
+L92
+L47
+L26
+L573
+R38
+R31
+R826
+R43
+R5
+L79
+R970
+R53
+R1
+L41
+R68
+R52
+R71
+R65
+L93
+L572
+L47
+R47
+L40
+L94
+L66
+R56
+R44
+R84
+R754
+L316
+R98
+R440
+L97
+R37
+R61
+L57
+R13
+R83
+R31
+R98
+L29
+L82
+R982
+L632
+L968
+R60
+L60
+L19
+R419
+L864
+L36
+L66
+L71
+R37
+L89
+R93
+L32
+L49
+L83
+L540
+L59
+L86
+R45
+L87
+R790
+R697
+R553
+L281
+R41
+R56
+R31
+R70
+L70
+R28
+L28
+L39
+R39
+R86
+R14
+L89
+R89
+R323
+L968
+L55
+R54
+L82
+L97
+L36
+R61
+R19
+L19
+L33
+L51
+L54
+R20
+L79
+L630
+L73
+R61
+R54
+R47
+L62
+R453
+R47
+L40
+R359
+L97
+R4
+R30
+L84
+L72
+R657
+R56
+R95
+L71
+L4
+L92
+L57
+L708
+L42
+R66
+L37
+L463
+L29
+R729
+R96
+L96
+L40
+R40
+L64
+L36
+L529
+R3
+L74
+L33
+L66
+L51
+R6
+L413
+R74
+L67
+L50
+R19
+R181
+L404
+R68
+L76
+L937
+L93
+L10
+L48
+L615
+R11
+R56
+R48
+R69
+R31
+R94
+R672
+R88
+L90
+L44
+L20
+L76
+L24
+L85
+R85
+L374
+L126
+R67
+R97
+R69
+L33
+L3
+R19
+L79
+L86
+L132
+L37
+R18
+L288
+L12
+R55
+R45
+R83
+R62
+R55
+L78
+R859
+R19
+L34
+L966
+L35
+R29
+L94
+L23
+R75
+R22
+R55
+R399
+R38
+R428
+R6
+L30
+R24
+L75
+L97
+R29
+R56
+R22
+L54
+R25
+R999
+R95
+L269
+L659
+L13
+R34
+L68
+L25
+R6
+L23
+L58
+R81
+R68
+L68
+R634
+R66
+R89
+R79
+R32
+L37
+L63
+R25
+L80
+R72
+L852
+L365
+L7
+R42
+L60
+L58
+L823
+L94
+L59
+R306
+L25
+R78
+L29
+R29
+R86
+L486
+R891
+L94
+R3
+L13
+L60
+R97
+L424
+R76
+L76
+R919
+R81
+L23
+L577
+L81
+R25
+L44
+L91
+R916
+L86
+L809
+L47
+R725
+L5
+R46
+L49
+L291
+L29
+R92
+R668
+L40
+R91
+R909
+L50
+L50
+L14
+R19
+L5
+R59
+R7
+R54
+R58
+R73
+R97
+L553
+R78
+R30
+L75
+R38
+R60
+R74
+R86
+R187
+R27
+R5
+R19
+L142
+L18
+L47
+L64
+R21
+L74
+R75
+R25
+L87
+L63
+R512
+L79
+L19
+L45
+R81
+L40
+L47
+L13
+L11
+R953
+L42
+R90
+L95
+R22
+L40
+L57
+L20
+R978
+R98
+L90
+L23
+L90
+L98
+R325
+L92
+L8
+L497
+R12
+R85
+L64
+L99
+L37
+L91
+R491
+R15
+L90
+L395
+L14
+R84
+L38
+R475
+L45
+R19
+L11
+L51
+L49
+L72
+L69
+R96
+R45
+R86
+R33
+L19
+L99
+L795
+R94
+R37
+R66
+L76
+L76
+R49
+R61
+R39
+L917
+L8
+L52
+L44
+R21
+R15
+R99
+L314
+R27
+R71
+R198
+L754
+L691
+R16
+L67
+R13
+L13
+R64
+L54
+L70
+R68
+L59
+L649
+R23
+R314
+L37
+R14
+L57
+L298
+L59
+L810
+L160
+R53
+R72
+L43
+L12
+R97
+L36
+L6
+L62
+R598
+R9
+R1
+R426
+L41
+R484
+R30
+L72
+L51
+R62
+L39
+R78
+R38
+L91
+R75
+L97
+R18
+L604
+R34
+L85
+L7
+R41
+L6
+L81
+R87
+R9
+L39
+L2
+L48
+L46
+L391
+R917
+R10
+L83
+L31
+L978
+R144
+R42
+R96
+L44
+R56
+L3
+L40
+R23
+L75
+L17
+R61
+L57
+R396
+R41
+L96
+R13
+R33
+L72
+R81
+L29
+R26
+L97
+L33
+R44
+R526
+R12
+R44
+R12
+R36
+L87
+R546
+R67
+R91
+L52
+R184
+L90
+R99
+L47
+R26
+R22
+L84
+R67
+L83
+R21
+L293
+L176
+R66
+R53
+R77
+R31
+L44
+L47
+L588
+L974
+L226
+L86
+L32
+R84
+L966
+L99
+L852
+L9
+R48
+R74
+R28
+L68
+L22
+L4
+L54
+R60
+L81
+L921
+R62
+R38
+R67
+L79
+L18
+R430
+R52
+L86
+L45
+L92
+L129
+R69
+R88
+R98
+R70
+L25
+L60
+L840
+R629
+L29
+R86
+L86
+L44
+R75
+L23
+R92
+L626
+R26
+R26
+L26
+L42
+L818
+R860
+R50
+R40
+L90
+L509
+L391
+R14
+R51
+L655
+L10
+R38
+L38
+R63
+R63
+L20
+R97
+R97
+R87
+L45
+R395
+L37
+L34
+R41
+L90
+L417
+L94
+R76
+R18
+L69
+R79
+L323
+L79
+L97
+L49
+R23
+L385
+L63
+L37
+L1
+L99
+R85
+R15
+L91
+R91
+L93
+R10
+L74
+R85
+L47
+R19
+R20
+R83
+L64
+L897
+L272
+L370
+R59
+R41
+R80
+L80
+R63
+R337
+L5
+L95
+R31
+R28
+R337
+L58
+R18
+R26
+R61
+R602
+L145
+L47
+R29
+R90
+L72
+L67
+R11
+R92
+R871
+R893
+R25
+R75
+R9
+L9
+R5
+L5
+L461
+L869
+L570
+R82
+L46
+L36
+R25
+L538
+L87
+L479
+R79
+L49
+R16
+R44
+R589
+L576
+R735
+R41
+L832
+R32
+L71
+R471
+L17
+L982
+R74
+L75
+L723
+L77
+R33
+R67
+L27
+R27
+R84
+L84
+R64
+L58
+L73
+R67
+L32
+R82
+R14
+R8
+R74
+R316
+R8
+L70
+L811
+R11
+R54
+R46
+L32
+R29
+R17
+L14
+R11
+R89
+R85
+L24
+R8
+R50
+R81
+L923
+R23
+L37
+L63
+R16
+L16
+R494
+R6
+L73
+L68
+L637
+R78
+L93
+L107
+L733
+R33
+L838
+R31
+R7
+L53
+L47
+R490
+R17
+R93
+R43
+R17
+L8
+R37
+R11
+L56
+R67
+L40
+R67
+L54
+L284
+L959
+L41
+R87
+R13
+L18
+L131
+R49
+L264
+R27
+R80
+R957
+L121
+R919
+L20
+L78
+L74
+R56
+R18
+L70
+L30
+R74
+R31
+L18
+L31
+L51
+L36
+L69
+R19
+R70
+R201
+L71
+R81
+L17
+R88
+R29
+L479
+R14
+R65
+R21
+R74
+R5
+R12
+L12
+L45
+L55
+R79
+L79
+R243
+L90
+L14
+L39
+L41
+L299
+L99
+R39
+L36
+L78
+L41
+L14
+R13
+L77
+R50
+R583
+L851
+R19
+R93
+R239
+R568
+L68
+L572
+L28
+L20
+L77
+L59
+R56
+R99
+L99
+R745
+L45
+L19
+R19
+L21
+R885
+L74
+R10
+R911
+R38
+L49
+L431
+R231
+R57
+R43
+R12
+R88
+L36
+L39
+L887
+R62
+R72
+R528
+R426
+R74
+R77
+L77
+R32
+R72
+R796
+R16
+R2
+R5
+R77
+L43
+R43
+L94
+R71
+L732
+R72
+R626
+R57
+L495
+R28
+R70
+R88
+R9
+L64
+R564
+L38
+R38
+R620
+R82
+R80
+R63
+L826
+L19
+L23
+L81
+L55
+L741
+L77
+R36
+L59
+L33
+R33
+L99
+L72
+L20
+L9
+R241
+L41
+R86
+L86
+L93
+L36
+R435
+L6
+L38
+L20
+L55
+R69
+R70
+R44
+R30
+R81
+R86
+L64
+R74
+R80
+R545
+L1
+L627
+L23
+R60
+R189
+L86
+R86
+R8
+R804
+R627
+R71
+L57
+R48
+L84
+R87
+L83
+R179
+L97
+R36
+L12
+R960
+L45
+L48
+L67
+R462
+R711
+L39
+R539
+R666
+L31
+L35
+R8
+L79
+R50
+L879
+R61
+R62
+R177
+R47
+L47
+L82
+L45
+L73
+R17
+R49
+L18
+L98
+R250
+L57
+L15
+L28
+L94
+R36
+L194
+R52
+L269
+L931
+L939
+L161
+R193
+R41
+L42
+L92
+L12
+L88
+R831
+L731
+R85
+R58
+R41
+R64
+R122
+R5
+L6
+R8
+R23
+R11
+L14
+R103
+L7
+L45
+L43
+R95
+R47
+R94
+R779
+R86
+R43
+L20
+L60
+L69
+R128
+R827
+L55
+L26
+R28
+R710
+L12
+L332
+L68
+R14
+L77
+R12
+L12
+R328
+R935
+L412
+R28
+L456
+R97
+R67
+L24
+R87
+R913
+R98
+R502
+L840
+L56
+L54
+R450
+L88
+R94
+L68
+R38
+R38
+R88
+R98
+R28
+R72
+R83
+R69
+R5
+L57
+R53
+L389
+R636
+R89
+L89
+R504
+R10
+R986
+R42
+R458
+R75
+L16
+L94
+L65
+R76
+R724
+R14
+L14
+L60
+L88
+R87
+R47
+R57
+R57
+L13
+L772
+R16
+R51
+L82
+L74
+R74
+L54
+L74
+L77
+R5
+L408
+R50
+R12
+R46
+L62
+R44
+L54
+R772
+L4
+L96
+L17
+L30
+R56
+R39
+R92
+R460
+R5
+L5
+L51
+R351
+L84
+L347
+R37
+R863
+R233
+L45
+R543
+R74
+L874
+L45
+R45
+L149
+R49
+L85
+L14
+L26
+L75
+L34
+L573
+R85
+L78
+L13
+L92
+L95
+R252
+L11
+L469
+L72
+L98
+L20
+R30
+L312
+L711
+R4
+R120
+R69
+R85
+R33
+R72
+R74
+L46
+R95
+L295
+L87
+L96
+R94
+R78
+L95
+L52
+L22
+L260
+L23
+L137
+R507
+R793
+L96
+L4
+R27
+L527
+R70
+R30
+R61
+R75
+R56
+R83
+L17
+R58
+L916
+L31
+L19
+L50
+L70
+R2
+R68
+L16
+L3
+R69
+L84
+R8
+L267
+R93
+R88
+L88
+L76
+R578
+R708
+R23
+L74
+R41
+R38
+L38
+R857
+R43
+R13
+L432
+L15
+R99
+R43
+L4
+L87
+R40
+L644
+R379
+R81
+R65
+L96
+R58
+R98
+R5
+L80
+R77
+R70
+L24
+L60
+R53
+L39
+R66
+L344
+L1
+R56
+L77
+L90
+R775
+R15
+R16
+R84
+L41
+R41
+L8
+R98
+L890
+R9
+R3
+R54
+L80
+L83
+R65
+R33
+R1
+L356
+L108
+L10
+L851
+R27
+R42
+R46
+L692
+L817
+L83
+R58
+R42
+R51
+L74
+R23
+R957
+R86
+R70
+R724
+R14
+L851
+L42
+R42
+R83
+L83
+L38
+R438
+R724
+L17
+R938
+L45
+R50
+R50
+R118
+R82
+L22
+R856
+L86
+L48
+R96
+R78
+R36
+R95
+R3
+R92
+L11
+L52
+L57
+R76
+L56
+R85
+R15
+R6
+L21
+L61
+R21
+R86
+L43
+L66
+R46
+L30
+L689
+R12
+L11
+R57
+R66
+R41
+L69
+L45
+R18
+R679
+L37
+L652
+R31
+L96
+L80
+L963
+L24
+R24
+R99
+L4
+L9
+L86
+L74
+R78
+L38
+R34
+L21
+R21
+L554
+R20
+R133
+L99
+R56
+L556
+R539
+L77
+L1
+L19
+R380
+R78
+R870
+L368
+L85
+R86
+R97
+L47
+R47
+R981
+R59
+R75
+R25
+R60
+L87
+L14
+R501
+L9
+R53
+R56
+R97
+R57
+R921
+L175
+L822
+R22
+L908
+L92
+L45
+R45
+R28
+L28
+L84
+L85
+L613
+L85
+L33
+L20
+L964
+L386
+R70
+L6
+R6
+R553
+R73
+R12
+L13
+L25
+R66
+L45
+L77
+R56
+L4
+R3
+R97
+R4
+L73
+R72
+L19
+R16
+L96
+L91
+R76
+R915
+L20
+R78
+R12
+L70
+L35
+R93
+R99
+R82
+R61
+R70
+L41
+L94
+L35
+L98
+R370
+R84
+L28
+L283
+L991
+R46
+L2
+L34
+L16
+L12
+R283
+L840
+L47
+R31
+L26
+L89
+L857
+R53
+R64
+L208
+L28
+L72
+R1
+R99
+L16
+R633
+R4
+L21
+R91
+R609
+L704
+L1
+R98
+L93
+L848
+L32
+L620
+R807
+R793
+R64
+R36
+L21
+R21
+R70
+L70
+R49
+R251
+R31
+R69
+R93
+R87
+R20
+R58
+R234
+R8
+R74
+R1
+L160
+L669
+R54
+R43
+R96
+R40
+R588
+L264
+R97
+L17
+R617
+R66
+L9
+L59
+R3
+R99
+L58
+R53
+R68
+L63
+L48
+R39
+R85
+R70
+L80
+R34
+L516
+R686
+R45
+L15
+R63
+R37
+L428
+R94
+R68
+L53
+L81
+L956
+L46
+L59
+R261
+L807
+L77
+L80
+L23
+L35
+R22
+L20
+L480
+L493
+R23
+L30
+R96
+L29
+R133
+L90
+R30
+R89
+R71
+R42
+R73
+L385
+R870
+L3
+R3
+L13
+R6
+L493
+R22
+L15
+L7
+R51
+R49
+R585
+L185
+L37
+R77
+R123
+L87
+R24
+L26
+R16
+L374
+R23
+L892
+R17
+R36
+R12
+L181
+R44
+L54
+R79
+R4
+R26
+L95
+L35
+R296
+R4
+L22
+L78
+R80
+R39
+L55
+R66
+R89
+L719
+L448
+L638
+R337
+R49
+L99
+R138
+R52
+R83
+L96
+L13
+R17
+R27
+R91
+R667
+R91
+L58
+L759
+L41
+R97
+R231
+L65
+L71
+L76
+L22
+R6
+L90
+R51
+L28
+R30
+L63
+R8
+R43
+R334
+R94
+L33
+R75
+L472
+L5
+R14
+R28
+R914
+L717
+L55
+L89
+R68
+L55
+L776
+R75
+R49
+R99
+R99
+R4
+R898
+R67
+L34
+R67
+R758
+R90
+L92
+R43
+L79
+R114
+L22
+R687
+R78
+R23
+R63
+R95
+R27
+R5
+R10
+R86
+L67
+R30
+L7
+R42
+L949
+L35
+L14
+R292
+L371
+R93
+R43
+R57
+R52
+L92
+R318
+L17
+L73
+L88
+R14
+L518
+R72
+R724
+R10
+L80
+R74
+R145
+L92
+L99
+R98
+L48
+R85
+L85
+L440
+L5
+R7
+R663
+L125
+L92
+L8
+L26
+R26
+R96
+R79
+R25
+R50
+L50
+R32
+L32
+R71
+R72
+R2
+R42
+R13
+L84
+L23
+L47
+L337
+R91
+R66
+L66
+L17
+L318
+L46
+R316
+R52
+R70
+L135
+L22
+R34
+L34
+L41
+L18
+R86
+L426
+L84
+R513
+L1
+R22
+L16
+R298
+L33
+R39
+L639
+R68
+L134
+R66
+L62
+R79
+L17
+R42
+R58
+R82
+L82
+L76
+L207
+L9
+R92
+R99
+R1
+L41
+R79
+R351
+R11
+R730
+R70
+R18
+L18
+R19
+R61
+R976
+L137
+R834
+L53
+L741
+R763
+L15
+R48
+L90
+R52
+L550
+L90
+R23
+R184
+R953
+L37
+R89
+L89
+L775
+R8
+R67
+R78
+R22
+L392
+L80
+L28
+L30
+L41
+L82
+L372
+L175
+R69
+L69
+L90
+R71
+L52
+R49
+L878
+R76
+L57
+L23
+L85
+R82
+L73
+L20
+R81
+L18
+R17
+R46
+L44
+L82
+L67
+R2
+L10
+R9
+R66
+L680
+L39
+R60
+R59
+L65
+R479
+L73
+R59
+R51
+L57
+R206
+L89
+L65
+L88
+R31
+R39
+L28
+R135
+R665
+L36
+R37
+L95
+R20
+R38
+L853
+R89
+L298
+L2
+L6
+R6
+L49
+R5
+L56
+R27
+R73
+R249
+R56
+L120
+R23
+R97
+L105
+R28
+R389
+R49
+L36
+R76
+L6
+R43
+L543
+R366
+R76
+R57
+L61
+R62
+R554
+R96
+R250
+L27
+R82
+R745
+L266
+L34
+R2
+R51
+R5
+R42
+L21
+L480
+R101
+R932
+R810
+L5
+R232
+R373
+L42
+R68
+L12
+L30
+R74
+L35
+L65
+R63
+R452
+L67
+L95
+R465
+L75
+L23
+R62
+L82
+L877
+R90
+R53
+L60
+L6
+R81
+R926
+L192
+R85
+L10
+L17
+L97
+L98
+R59
+L49
+R73
+L61
+L25
+R84
+L59
+R76
+R79
+L6
+L69
+L99
+L38
+R64
+L7
+L49
+L93
+L58
+R59
+R41
+R77
+L86
+R9
+R68
+R32
+R20
+L20
+R44
+R95
+R83
+R89
+L14
+L97
+L15
+R68
+R69
+L7
+R73
+L15
+L56
+R74
+L91
+R43
+R47
+L40
+R50
+R44
+R56
+L61
+L18
+L21
+R69
+R31
+L71
+L29
+L27
+L73
+L61
+R75
+R86
+L90
+R32
+L26
+L3
+R46
+L38
+L18
+R36
+R7
+R21
+R6
+R19
+R43
+R1
+R17
+R13
+L17
+R3
+L35
+L31
+L45
+L1
+L31
+L44
+L43
+L23
+L2
+R9
+R7
+L35
+L12
+L5
+R35
+R5
+R23
+R32
+L43
+L23
+L36
+R8
+R23
+R4
+L25
+L49
+R43
+R37
+R47
+L38
+L9
+R18
+R10
+
diff --git a/mark/day1/part1.rb b/mark/day1/part1.rb
new file mode 100644
index 0000000..65fda80
--- /dev/null
+++ b/mark/day1/part1.rb
@@ -0,0 +1,29 @@
+class RotationDecoder
+  def initialize(file_path)
+    @file_path = file_path
+    @mapping = {
+      'L' => :-,
+      'R' => :+
+    }
+  end
+
+  def decode(debug: false)
+    code = 0
+    current_num = 50
+    puts "The dial starts by pointing at #{current_num}" if debug
+    File.readlines(@file_path, chomp: true).map do |line|
+      next if line.nil? || line.empty?
+
+      direction, *number_arr = line.split('')
+      number = Integer(number_arr.join)
+      current_num = current_num.send(@mapping[direction], number) % 100
+      code += 1 if current_num == 0
+      puts "The dial is rotaded #{line} to point at #{current_num}" if debug
+    end
+
+    code
+  end
+end
+
+rd = RotationDecoder.new('input.txt')
+puts "The code is: #{rd.decode}"
diff --git a/mark/day1/part2.rb b/mark/day1/part2.rb
new file mode 100644
index 0000000..b77d577
--- /dev/null
+++ b/mark/day1/part2.rb
@@ -0,0 +1,53 @@
+require 'debug'
+
+class RotationDecoder
+  def initialize(file_path)
+    @file_path = file_path
+    @mapping = {
+      'L' => :-,
+      'R' => :+
+    }
+  end
+
+  def decode(debug: false)
+    code = 0
+    current_num = 50
+    puts "The dial starts by pointing at #{current_num}" if debug
+    File.readlines(@file_path, chomp: true).map do |line|
+      next if line.nil? || line.empty?
+      direction, *number_arr = line.split('')
+      number = Integer(number_arr.join)
+
+      full_rotations = number / 100
+      rest = number - full_rotations * 100
+
+      raw_num = current_num.send(@mapping[direction], rest)
+
+      # include 100 since that does not pass *through* zero but becomes exactly zero.
+      passes_zero = 0
+
+      if current_num != 0
+        passes_zero = (0 <= raw_num && raw_num <= 100)  ? 0 : 1
+      end
+
+      current_num = raw_num % 100
+      print "The dial is rotaded #{line} to point at #{current_num}" if debug
+      print "; during this rotation, it points at 0 #{full_rotations + passes_zero} times" if debug && full_rotations + passes_zero > 0
+      print "\n" if debug
+
+      code += full_rotations + passes_zero
+      code += 1 if current_num == 0
+    end
+
+    code
+  end
+end
+
+if ARGV[0].nil? || ARGV[0].empty?
+  puts "Usage: ruby part2.rb <file_name> [debug]"
+  exit 1
+end
+
+debug = (ARGV[1] == "debug")
+rd = RotationDecoder.new(ARGV[0])
+puts "The code is: #{rd.decode(debug:)}"
diff --git a/mark/day2/example.txt b/mark/day2/example.txt
new file mode 100644
index 0000000..bd04584
--- /dev/null
+++ b/mark/day2/example.txt
@@ -0,0 +1 @@
+11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124
\ No newline at end of file
diff --git a/mark/day2/input.txt b/mark/day2/input.txt
new file mode 100644
index 0000000..34b9d7b
--- /dev/null
+++ b/mark/day2/input.txt
@@ -0,0 +1 @@
+1090286-1131879,3259566-3404881,138124-175118,266204727-266361099,16765-24272,7657360692-7657593676,88857504-88926597,6869078-6903096,48444999-48532270,61427792-61580535,71-103,8077-10421,1920-2560,2-17,951-1259,34-50,28994-36978,1309-1822,9393918461-9393960770,89479-120899,834641-988077,5389718924-5389797353,34010076-34214499,5063-7100,607034-753348,19098586-19261191,125085556-125188689,39839-51927,3246-5037,174-260,439715-473176,187287-262190,348-535,58956-78301,4388160-4505757,512092-584994,13388753-13534387
\ No newline at end of file
diff --git a/mark/day2/part1.rb b/mark/day2/part1.rb
new file mode 100644
index 0000000..8b8dce0
--- /dev/null
+++ b/mark/day2/part1.rb
@@ -0,0 +1,57 @@
+require 'debug'
+
+class ValidIdFilter
+  def initialize(file_path)
+    @file_path = file_path
+  end
+
+  def sum_invalid_ids(debug: false)
+    ranges = parse_input(File.read(@file_path))
+    invalid_ids = ranges.flat_map {|range| get_invalid_ids_from_range(range)}
+    invalid_ids.sum
+  end
+
+  private
+
+  # @param [Range] e.g., 11-22
+  # @return [<Integer>] array of invalid ids in range
+  def get_invalid_ids_from_range(range)
+    range.select {|element| invalid_id?(element)}
+  end
+
+  def invalid_id?(integer)
+    # ID is invalid if it is made only of some sequence of digits repeated twice
+    string = integer.to_s
+    num_digits = string.length
+
+    # some sequence repeated twice => number of digits must be even
+    return false if num_digits % 2 != 0
+
+    half_length = num_digits / 2
+
+    string[0...half_length] == string[half_length..-1]
+  end
+
+  # @param [String] full input e.g., "11-22,33-604,..."
+  # @return [<Range>] e.g., [11..22, 33..604, ...]
+  def parse_input(input)
+    input.split(',').map {|range| to_range(range)}
+  end
+
+  # @param [String] e.g., "11-22"
+  # @return [Range] e.g., 11..22 (inclusive)
+  def to_range(string)
+    boundaries = string.split('-').map(&:to_i)
+    raise "Invalid boundaries for #{string}, got #{boundaries.inspect}" if boundaries.length != 2
+    Range.new(boundaries[0], boundaries[1])
+  end
+end
+
+if ARGV[0].nil? || ARGV[0].empty?
+  puts "Usage: ruby part1.rb <file_name> [debug]"
+  exit 1
+end
+
+debug = (ARGV[1] == "debug")
+filter = ValidIdFilter.new(ARGV[0])
+puts "The answer is: #{filter.sum_invalid_ids(debug:)}"
diff --git a/mark/day2/part2.rb b/mark/day2/part2.rb
new file mode 100644
index 0000000..8b8e0d9
--- /dev/null
+++ b/mark/day2/part2.rb
@@ -0,0 +1,74 @@
+require 'debug'
+require 'prime'
+
+class ValidIdFilter
+  def initialize(file_path, debug: false)
+    @file_path = file_path
+    @debug = debug
+  end
+
+  def sum_invalid_ids
+    ranges = parse_input(File.read(@file_path))
+    invalid_ids = ranges.flat_map {|range| get_invalid_ids_from_range(range)}
+    puts invalid_ids.inspect if @debug
+    invalid_ids.sum
+  end
+
+  private
+
+  # @param [Range] e.g., 11-22
+  # @return [<Integer>] array of invalid ids in range
+  def get_invalid_ids_from_range(range)
+    range.select do |element|
+      invalid_id?(element)
+    end
+  end
+
+  def invalid_id?(integer)
+    # ID is invalid if it is made only of some sequence of digits repeated AT LEAST twice
+    string = integer.to_s
+    num_digits = string.length
+
+    puts "is #{string} an invalid ID?" if @debug
+
+    (1...num_digits).each do |n|
+      next if num_digits % n != 0
+
+      slices = string.chars.each_slice(n).map(&:join)
+      puts "...trying divisior #{n}: #{slices} ..." if @debug
+      return true if slices.uniq.length == 1 && slices.length > 1
+    end
+
+    false
+  end
+
+  # @param [String] full input e.g., "11-22,33-604,..."
+  # @return [<Range>] e.g., [11..22, 33..604, ...]
+  def parse_input(input)
+    input.split(',').map {|range| to_range(range)}
+  end
+
+  # @param [String] e.g., "11-22"
+  # @return [Range] e.g., 11..22 (inclusive)
+  def to_range(string)
+    boundaries = string.split('-').map(&:to_i)
+    raise "Invalid boundaries for #{string}, got #{boundaries.inspect}" if boundaries.length != 2
+    Range.new(boundaries[0], boundaries[1])
+  end
+end
+
+if ARGV[0].nil? || ARGV[0].empty?
+  puts "Usage: ruby part2.rb <file_name> [debug]"
+  exit 1
+end
+
+debug = (ARGV[1] == "debug")
+filter = ValidIdFilter.new(ARGV[0], debug:)
+puts "The answer is: #{filter.sum_invalid_ids}"
+
+# The answer is: 41662374059
+
+# real	0m24,122s
+# user	0m24,049s
+# sys	0m0,070s
+
diff --git a/mark/day3/example.txt b/mark/day3/example.txt
new file mode 100644
index 0000000..7255fca
--- /dev/null
+++ b/mark/day3/example.txt
@@ -0,0 +1,4 @@
+987654321111111
+811111111111119
+234234234234278
+818181911112111
diff --git a/mark/day3/input.txt b/mark/day3/input.txt
new file mode 100644
index 0000000..fc7c422
--- /dev/null
+++ b/mark/day3/input.txt
@@ -0,0 +1,200 @@
+4426546555433545424424345444644242452452532444564422646557424354153538454225332755435544545533324152
+4325282447422434333445212333343451413231333423353426332541123254243232342322553322244341312543932333
+4332333442334543644333542384256325234452445449454359452442434444344242333247233254353342732444654333
+3242342268563381365322464432323462722532321262324224633345426519263464226222933213111434342164622216
+9447673765733475853338583623277776759662892975737572674219274588774764767584838732636637987466747925
+5465666747656245473486677773645858655623848436585748584726454883586526877665853454785577677638954758
+2444454545573358335454444444533657461424744633575454555414644566436546558449448833539855835444255524
+6157461556353423546422234143542323532463543463631966444536448423543534355464334335525162636648321353
+2835376666759365533343684448534555132335383873465765564643686464153633459349536367566364363345632544
+7344353747645474324795566237335767744553352745445443443425543365567665332834442736643744656373346534
+3432324344242432243242442431213424312243322133232222316433433435212164332223444243334342533334253482
+2622221422722224222132452327221224222224622222233223222324242132332222422263234452222242224221222352
+2333333333332434452126434233262133133233322433432323143323224312238323253333223423537495436441425233
+4223121252222122212232222432222222321212224221232222222232212222212222132111222212222222222251232212
+5656364443456476766564447464434634344344454564655366674845343634444454533645485474555461444675445464
+2222222121422212221222211522213322122342313222422223311222223122112232223422311251182122213322222322
+2333223312323513354132532323242345322322263522221232522335232221232532332552333214121322322432333326
+7375355567864373516855538565346166466365834565633643466338563523647238744789722453348483369683756368
+3433535626365433336245424263342632336633352551353243934354326534345544334562636336633544635333676646
+4552543245436445453245462344463365545345654265453546534544522571554353554535445555264545655555435564
+3462831622494255764853548733574574745524782433922944636735655223248563544574263724458232637544263524
+3222443423222532333422343715535222233233323223229323147323212322223213235433123142326522263133222232
+2333212333432333323325252331233333222732313232324333223824122338323314233632223363333234252333334334
+2331142222264423421223242247254264221412241455233167423223334223352322243322332242134435224322124222
+3221232222123222222425122224223222211121332122111521114212121232122222222222222122314421232222252312
+4434524632643643753662622454563441256616464333645346343655435445363437355666544625446446124156665532
+5763246121842223223525634383114633483812622132447222352264521354343613323122493132222226422223222227
+4323333144422413453633413411233333333524243423323613442334134334272326443343531222133522232333343333
+3234234214223423333422221324424143222312253223324541242142332343441224324344332443233314464323322144
+6423483553431355233336233333334345336244367322543433123333331822542553361323313533255325347255353232
+3132322222322223233332424222432332122221122223412222221632222233122242222122222212233244323221112222
+3223234252425333332431323241242843445242944231814342524224422222443223243222362422833222432522631613
+5452134346551715474544663545634746754756625755345636644657534453655793446525544636345465565236542746
+2542562623212274282227172127123225532255466656628222232244712231262232124222523356442314912654421246
+3211225233123342323233432331212112221333223152322132324122322221233222222322521122723211222213111242
+3353334454347529351635537433344434323313154333345532453533454333633334344534233232145423334343453133
+2421322222222122222412222224221426142223221233322432132223212222221222232223242222321211134225212332
+2232211322312221132342223122223332153233222312242233123533242332222253322332323321225223222123351323
+2212222224122111321322222224322232242322432433322422234351322233321213212322244451123232212221462122
+4753242222111143324312132423244222742522462564632213322315132132323232112123373333383241221125242823
+3343332433226522442332523325331434632334332234433541332334332333321533324463433414323223423452445324
+4524344323452457441245426433352336433434326553565344545554463553455544438435453243345453543233364638
+2222422222322342226232333126234322221442134145212323311233323344224332322333321262212224323432221122
+3383323533448644425453227556452478544424474425324446235764223364445645333444575644414514755244224244
+2343242223221423221232222232322235123135222322222232122251223342243132222424232324122223332321323212
+5354554743424254448274373224228344347744467457167542342976472253445454527198343453444286454338544176
+2223211322212241122221232422322724112224232322212224323223222222212223424124222122257222212222232222
+2434554333445323364344355343542565534353653433345424223233434552444423334434254443374352343633354723
+1122223211242218322232222242222112412222222221222222222212321214432122222222122244222323222222433232
+3435223328333433433423336213335333445244223322372743356333333243335234343654352533322143336232326235
+8378544742468475446585326743783446225742243547346625347879353444342544356656636165235963767334746667
+4244322165354443483434332332423145332345674233324467345451342454527444434234355653425334335554423131
+3244347437313313632433324346415274333463523334233534224637213384333473875425377585334343383721435623
+2685554554535645656456735785556654556665554733943566616656484545455547455754473547517575534755375566
+2222322216222333226262621222213222222227514342221543131325335242221222513222622112127222215253128122
+2222222262225252142233624112522171323122223221242262223222122712226213222711321417112221235466122121
+4333334333225345444622224221332232322243222233423332232235132211236444525373232243322332243234262321
+2642248522122252125221232142221232256424223236215252122642362222222132321222242222522122221426222223
+1226322213251222422211232523211123242331232172224333323215133213233424333516323452242312232222623422
+3122222231213232113242212232822222232222122321222222222212222222122321123322222212322212121221222422
+5423564478854726637332596675245464556354355735582626475634453543575355574784577434459673155684554357
+7222321335635332262332412434655413219633232924622212225164226142242353542343246225753542125222223323
+4267551322534512666454222747274155257242331311455351563556413453655624563424531822633534636274521322
+2322252211221211212122132112222243131223523232132222423222341263332222222212222222222222222221122223
+1768674274274986682341368484535667696977568449486752359465927464497766917178351845264522476299462558
+9973345886329838748767628288667977447953869989379958839745584248767715872788288778581455834264386794
+3147438151432333338344236338737232494224134234544451682652215132332644832842454283383842482244335321
+4643566433347766744675635495457354222475461644663645226234346245536452754345745454465444932565942745
+2225215324326423122223233242434242213262412222221233223222352542224342323121544223222222122424243522
+5322245452664656566453255356611235646656355152264354425465513351415225316613615411625412314435245789
+3532512623242331522454811463433144216352121322573268272964662224275267222324238362545294252247226249
+4212831421213232133322223142223222232221223244343332213353123322323123224122232252313232232212321237
+2559516646662636458444562545554866446626574222272432644244645625329345646257123324497646538129494375
+9487697645944865567668753567656668967724574897467656455865855168454565445566546659685676656548457565
+2271259332592124428922232222322232962517342622322222232214172224332228267227221228162482262221225237
+6443233123316232234343521343174244263223442223223423321152221313245363424122444225443331425623722332
+2631223233332234232222222232233223624324362331422523223632222321252622533132312233252333334122352232
+4374594442425431244344493962542232434523455225227447382442522423334443974437423421342463423254543531
+2355432333335223334533427244747262427442234442324341339233344374345153362152323144742423388326423162
+4443445423434244443443444444444444444453454434424544344351234534453344444435446233443343433434443455
+2253732224712335116222521332125212432325522332331223222422222222232262233125222132623218312312722532
+2745126446333335224424526135332462445373274523354244145463333432422845424534532453225244484442333526
+7243231322222522523243218221822229211222272222132121225212212218162223322262253352242226222836222214
+8455234156755525686463552552391658345445893588246565526285564774355441646662555577978368642945158266
+3343333323213243433334231333434335323412312313221233333132122333233383333233332333432113332333333423
+3383456734935633752439463334363637796364566576539414396635336233843642426783335654663528832337243282
+5344511435325253223124322422315232342443444521133233112342244413322214342143342332245442224284224114
+5672432544132225246254263346129622122631332113422332144322322464231221212259362226232222422423235425
+4524322944436266647664456155534453463635345234664725273342535542575445335444366346254436463682322565
+3451334242232142352433232562333233532438333363343323646422333622532339344445433533245221232362638635
+3233443334336222212333333313221143322323332233423311342213212323422233331233212221332323232313422232
+3538335453453474345453632453342555554432484344312443323743442437447424536444524434375434843224232542
+1134323333132313131333332323533133333233333623323322333244441332334233337333342274333223433233323332
+4454243314521342324532544347434334434335235444344344323342233636214464723343447422324342472464431443
+7212243259122532255215244522214125222124232452252245212117552255264655222522223426322454253422326222
+2312222222222232222222222222222322717232232212282223722231223211112223222213222121232234222222322523
+2423334254424242124413222223224442344344242422322434223443444442221241423332334442224443342321462224
+2128125222642211322122234225124121551426222122221152223262222223412226123232213242622126562225123425
+6363447276635566243523623745255552583521353635323266575519555685676553658347552943633545254924961552
+3676667755587373466346533576626132364223763383165653452675353348646644426366668265737356353476244576
+3422633322422226226233112222224522622422332233123762752272222426216644523363422226125279441225422222
+2421513543234255328413453513213432322425243313515222254346232334321335531342525442552353235434465512
+6415375652731773743516117625153734627224124775172663723121614653367227355752147244664377477315124189
+2422422221222321721222213222222133221322412121222341242222222524122224222242242227224232222222122221
+2222263221312126226422222222222232232232522122222312521212274512142222222239332233161324142222522322
+5214224342122322832221621223821233232353524332825644542254213312221562222316123326232465523312421432
+3666692346463343673765135653333572386454548636472533677643225343655156493533632665435433533363333333
+3236336332133335334334333531334446329333352333444233443333333223336235333533336533533333723322331753
+2332334253445774533552442335534343543373535353354533442353484244432315244243232631235533431325434332
+4552521221112255538222453252525742232852622245255471828252221432256124422144256362213422525332324121
+2372252333723353563333333333333473383323733335833336432411333324316543339422239234393336716637333323
+3332446134233313232612333632163334334322633133212431333462333333224835333344223255333363212354123333
+7552341253243523459433362762313446662433224122932234263432225853655524828528628382822322238267265157
+2322134512221642323542323223511513233543226122331621224322223253615122232123422252522132621252231222
+3429232333431322243333344632343394443442424314352323431333625322314431334423554324321344442415335134
+3133332324343452323333322323333333333334333264133233333332532333133321223323533333342253313333423342
+1343335423352323663332543443263364446232322235234335543232624626585721313544983224252225332324323924
+2343384322234463353555425322583755232622465243247424222413556356413728443742314344222113244251532353
+3232332334422662733311142222213624242324423442212272161353921332323323365114222662326433222211432822
+4744234125222815354354425333344321443843244443221424452394343442222524324344242221332233234242225342
+3462334428262249425482933131743232559746433332564353333244493126335533625323339453832154482421223425
+2222222233134212222222432222224221127322233223212223221332321127222222212311222222122222243322422222
+2432244232223322212223324331424131121232632326332432333422623232243223132243212732213222236112343243
+2353263413345543333423353333424313435236563342233313443334554332372614164221334333214242433343743323
+7262356332233565589343731635726333342324341343234343563337573343334533753353534223443345323333245553
+3431242323312112222476523222532327232153214423528222422132232322222221233323223323234454532312329644
+2333735367546552954626277275124585694263757293962825277347554513674261336273395694226566284745773263
+4173649643475436334333444938463434845834634643336464565244456555431735334846564366333644454658838434
+4224822332242633868373338733362313852898442333324233232246336466283378321233368462332243239624724493
+3534333234432441324334224322153333431244222322152323333332413324252424224444334223352334223435244433
+6797668434457363662697495794664668479675438735856666846457733757642696558784863738494973567987667785
+2532234351434333422252314325113333335424552231452251415554155221313444214412351243321242521144116789
+3342963235551769332228529676272853356744577245483232553575727464245624975847586372312522857261324765
+2524433365455335343313442426354273335335232214443343435433184332364226333334324442532433433436434544
+4222122212332332222223231213222222312211212212121323212233252322321222222213413222323221123352221114
+5424545545342434324453533434332434353334333329332435543336333525325324324362551332333536454133333544
+2222314222413221272111232133221322313112115242245223141212412222244222235114332221123332223221212312
+3212651335442221253634222242124222222642441435234212423212262422522122224324245252222146563216221221
+4534343343554434373455224333444314444534552343337347433344543433344554444335355543345534555526436343
+2912822222483322222232264222224151451255223222333452422122242122248232332227722421522312222232532253
+4363374545543434544442423374342545266566843654647345434434454434474633695544412328432786264722435234
+3343564345744435343522324454522434441435423445134313333444444543324535244244543454334444434424484334
+2322363112224333222332112622331313163122212323222223232231512332235223225122413223321223322222232531
+8546436128277177943554413533685443435367862667384842533295736533834223234414837551795743345232755356
+2213223311223816122359924212256213822322211521422222324321352333322322323236222322223293232222322212
+2554435553538564422555424565552315565514525555355255522743428555232444455355554251246333452345246463
+1333422325315555874222532212731223224223254342221837511242452534326213523243452252233223213322135222
+5645369885892365427476667837637577773387463956656474667757655456846365465836456434746556672555434687
+1421112121223232721222412222222242124512328121322221222122322232222222221131222232242224221212222222
+4775668564556556665766856661654556565656666644646647565572556665554564646675658255256457555646455672
+2342452332222224551123243223222322223222532243215346511152222243322321233351223234222223444213272213
+3134413132411423221323242221321124214114211142114424214131341214344331244312323444323444224243356789
+6474433335362433434337434438443364393293343534343624232383334873273856337846437336343634353362444433
+1233243332444222224424623312622422472142523322262753551222225262222542223454332322545228267264346425
+5236344253423354343636325463336333356423827726333436538779343734634346263644934337562547952563333333
+4224632223222123112222412224243141262412423241322342423442281422522214232242353421222312244224243143
+7469877946847665655586749745973337476666558883376764458965456455676568725755555867744856659595665642
+5356755557561456634566445832832547543365283554567566675752345723326653666295553666765253254564575736
+2321311332333231423323221223223244435231441322214322333343224233412234223313431433353223233353143421
+1124322462241222221323531412334544222322323221214234222324232244223432212422222224223232224112243112
+3332442446346324333247187342434234143434236438533225434637244346324434633333433333446545833348946344
+6262322616264315213225632354273927727338283215826672178422371664423342442785822317832925655256257219
+5445524443444335333443353344243433444334443434344463323445434545248233545423324544444294345453333455
+4223232323333222323333332333322222233332323333313333323242343333332533345333222234233313223533211212
+2223426222252122224112251232142242221222124233312222241221222222212222211222222212224522125231221311
+4627241234423313342333322364213144422247433314234222223143223654226435149632233443252543432234336311
+3333323422333333355233333234444322224324422233131223315323344321434242338123343332321421433143242699
+5722624812261213242322822324282536352232415433623728387976822137157726222323252211524835225474266852
+6336122553423455134143235434142621433345423333324344332423352336233623352364143643333142317333344763
+2323435345339933333233234413323332823632433922347933212225322223237234444332332812753453212221655776
+2114332232122222227222233321132222191224112232322223323413216233224325414223233154142153523213232123
+4363233516332573234322264326642333411233222345332333464327253633423433332221226225313723253223432622
+3422222121231221222421222222121272211223124211222222214432222512422226462422122222221351154222226222
+6573185767843422374335785736331723571626823274547783151717468323887386811276575242725477122713746669
+2433323232322344222233231233134132334523323222232325242333412233214322233314333222533333224362222422
+3222122212322122231223222223232222222313222223113212232222222133211321213121322523223222211221322321
+1242342322434314342233214544224322432222222225724432314723213225244242244514424424223342332323333244
+3322223323232222222221522223212133322322222621322222322222322223213622312322343212233241322414122422
+2625245231422282221441423513255742414624272364847631422343335664343424253113724224727363324547221242
+3326371332622228837252563473123241224363133633313838447333321443724272332475132742349125916442355543
+7233222122232253233222242323323223314121222243233553222212213232332233632222221633531222213332222322
+4421224312252242222221224112221222222224212412222452223422331222221221224222221232323262264232222222
+2253123212223333222222213222243313323332331322233232333213243323321232223233337222421123221325322512
+3225422162433131224312223212312251243322224132425122234262233531224344222313224662223321322393231236
+4642342261562254443344423445428214722743264973162525543742232816222224553343421222242126532254365481
+2312212121222212523433224231211322312282222222522222132135222331121123255225272322122223213222222223
+4312231325246222214421322221112212232222221236232224117221364342225122132212423231222513213355222221
+2651242333442243323334334146333233144333442323333456343363233634333343243343244336244433225344135332
+2763248524234572433753223233622223332331723214122435341443231732223246222334223132623282652622283543
+3243222223323231422312437333423314711552416423122312422543424332522221326222321244222322221422322327
+2233554224243333415331323334332253253232644223453213913343546821552553232233353435533223533435332663
+9646747667546966454644685753753665685635164767563757666773248774626764856573263365676475553556725744
+3865568344165174355665436356555345223355325727554952341715231585477375575282248527523565666551546585
+3234454554445754244327453332241719736853566345534435633379658436763224463639555336653466444123247355
+4438345364534443344333623345533334653253544343661423635845633336348738944346332432336336246326235385
+2114324212222322222222212222254122222222224124132122221332222222424224232332221334212112412425623122
+6221313223122322312222223332222212322222322243233162222222221321233262222522241312222311223223222251
+3134343613223133354232233332661513531335333432332323336333332333333323334433432234333333333632313335
+3413243315334423214232123334223123332333344421223321223234232342332444434512222243333333421331422733
+3643433552173224434364263213563492453254231457525737335444546343413142646222466454322422842347463343
diff --git a/mark/day3/part1.rb b/mark/day3/part1.rb
new file mode 100644
index 0000000..888d405
--- /dev/null
+++ b/mark/day3/part1.rb
@@ -0,0 +1,49 @@
+require 'debug'
+
+module FileHandler
+  def self.read_lines(file_path)
+    File.readlines(file_path, chomp: true).map do |line|
+      yield(line)
+    end
+  end
+
+  def self.read_file(file_path)
+    File.read(file_path)
+  end
+end
+
+class JoltageCalculator
+  def initialize(file_path, debug: false)
+    @file_path = file_path
+    @debug = debug
+  end
+
+  def calculate_total_joltage
+    total = 0
+    FileHandler.read_lines(@file_path) do |line|
+      int_array = line.split('').map(&:to_i)
+      length = int_array.length
+      first_digit = int_array.slice(0, length - 1).max
+      first_pos = int_array.find_index(first_digit)
+      second_digit = int_array.slice(first_pos + 1, length).max
+      total += "#{first_digit}#{second_digit}".to_i
+    end
+    total
+  end
+end
+
+if ARGV[0].nil? || ARGV[0].empty?
+  puts "Usage: ruby part1.rb <file_name> [debug]"
+  exit 1
+end
+
+debug = (ARGV[1] == "debug")
+calculator = JoltageCalculator.new(ARGV[0], debug:)
+puts "The answer is: #{calculator.calculate_total_joltage}"
+
+# The answer is: 17166
+
+# real	0m0,256s
+# user	0m0,207s
+# sys	0m0,049s
+
diff --git a/mark/day3/part1_prep_for_2.rb b/mark/day3/part1_prep_for_2.rb
new file mode 100644
index 0000000..637f281
--- /dev/null
+++ b/mark/day3/part1_prep_for_2.rb
@@ -0,0 +1,67 @@
+require 'debug'
+
+module FileHandler
+  def self.read_lines(file_path)
+    File.readlines(file_path, chomp: true).map do |line|
+      yield(line)
+    end
+  end
+
+  def self.read_file(file_path)
+    File.read(file_path)
+  end
+end
+
+class JoltageCalculator
+  def initialize(file_path, debug: false)
+    @file_path = file_path
+    @debug = debug
+  end
+
+  def calculate_total_joltage
+    total = 0
+    FileHandler.read_lines(@file_path) do |line|
+      int_array = line.split('').map(&:to_i)
+      total += calculate_joltage(int_array)
+    end
+    total
+  end
+
+  # @param [<integer>] bank
+  def calculate_joltage(bank)
+    joltage = ''
+
+    first_digit, first_pos = max_and_index_from_slice(bank, 1)
+
+    joltage += first_digit.to_s
+
+
+    sub_bank = bank.slice(first_pos + 1, bank.length)
+    second_digit, _ = max_and_index_from_slice(sub_bank, 0)
+
+    joltage += second_digit.to_s
+
+    joltage.to_i
+  end
+
+  private
+
+  # Get max and index from the first part of the array. Ignore the last `offset`
+  # number of digits.
+  # @param [<integer>] array
+  # @param [integer] offset
+  def max_and_index_from_slice(array, offset)
+    maximum = array.slice(0, array.length - offset).max
+    index = array.find_index(maximum)
+    [maximum, index]
+  end
+end
+
+if ARGV[0].nil? || ARGV[0].empty?
+  puts "Usage: ruby part2.rb <file_name> [debug]"
+  exit 1
+end
+
+debug = (ARGV[1] == "debug")
+calculator = JoltageCalculator.new(ARGV[0], debug:)
+puts "The answer is: #{calculator.calculate_total_joltage}"
diff --git a/mark/day3/part2.rb b/mark/day3/part2.rb
new file mode 100644
index 0000000..56cb1a1
--- /dev/null
+++ b/mark/day3/part2.rb
@@ -0,0 +1,91 @@
+require 'debug'
+
+module FileHandler
+  def self.read_lines(file_path)
+    File.readlines(file_path, chomp: true).map do |line|
+      yield(line)
+    end
+  end
+
+  def self.read_file(file_path)
+    File.read(file_path)
+  end
+end
+
+class JoltageCalculator
+  def initialize(file_path, debug: false)
+    @file_path = file_path
+    @debug = debug
+  end
+
+  def calculate_total_joltage
+    total = 0
+    FileHandler.read_lines(@file_path) do |line|
+      int_array = line.split('').map(&:to_i)
+      total += calculate_joltage(int_array)
+    end
+    total
+  end
+
+  # @param [<integer>] bank
+  def _calculate_joltage(bank)
+    joltage = ''
+
+    first_digit, first_pos = max_and_index_from_slice(bank, 1)
+
+    joltage += first_digit.to_s
+
+
+    sub_bank = bank.slice(first_pos + 1, bank.length)
+    second_digit, _ = max_and_index_from_slice(sub_bank, 0)
+
+    joltage += second_digit.to_s
+
+    joltage.to_i
+  end
+
+  # @param [<integer>] bank
+  def calculate_joltage(bank, total_digits: 12)
+    joltage = ''
+
+    current_offset = total_digits - 1
+
+    while current_offset >= 0
+      maximum, i = max_and_index_from_slice(bank, current_offset)
+
+      joltage += maximum.to_s
+
+      bank = bank.slice(i + 1, bank.length)
+      current_offset -= 1
+    end
+
+    joltage.to_i
+  end
+
+  private
+
+  # Get max and index from the first part of the array. Ignore the last `offset`
+  # number of digits.
+  # @param [<integer>] array
+  # @param [integer] offset
+  def max_and_index_from_slice(array, offset)
+    maximum = array.slice(0, array.length - offset).max
+    index = array.find_index(maximum)
+    [maximum, index]
+  end
+end
+
+if ARGV[0].nil? || ARGV[0].empty?
+  puts "Usage: ruby part2.rb <file_name> [debug]"
+  exit 1
+end
+
+debug = (ARGV[1] == "debug")
+calculator = JoltageCalculator.new(ARGV[0], debug:)
+puts "The answer is: #{calculator.calculate_total_joltage}"
+
+# The answer is: 169077317650774
+
+# real	0m0,260s
+# user	0m0,222s
+# sys	0m0,038s