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Day 01 - Input

R48
R2
R29
L38
L3
R50
R21
R29
L26
L44
R1
R11
R5
R36
L43
L5
L15
L45
L38
L34
R14
R34
R50
L28
L8
L24
L50
L22
L10
L45
L8
L41
L23
L7
L3
R50
L31
L43
R17
R39
R31
R45
L42
L26
L27
L43
L40
L33
L19
L24
L74
R3
R56
R98
R43
L32
L42
R16
L64
R22
L64
R64
L67
R67
L65
R47
L82
R69
L69
L50
R86
L27
L28
L51
R70
L48
R94
R54
L27
R54
L27
L81
R33
R48
R22
R94
L75
L69
L53
R70
L89
L51
R51
L30
L53
L17
L82
R54
L39
L99
R66
R2
R29
L31
L84
R33
L35
R59
R24
R3
L15
R315
R18
R2
R80
R88
R12
R53
R94
L49
R63
L61
R5
R995
L61
L38
L68
L52
R67
L33
R87
L2
R27
L727
L77
L23
L80
L20
L15
R76
R940
R39
L95
L99
L77
R82
R6
L57
R20
R80
R66
R94
L13
L47
L54
R54
L811
L942
R93
R95
L87
L74
L74
L22
L754
L70
L54
L31
L912
R43
R2
L34
L789
L17
R80
R958
L45
R45
R11
L912
L115
R29
R70
L650
L26
R93
R17
R83
R35
L85
R88
R309
L71
L5
L71
L17
R39
L99
R77
R15
L85
L69
L69
L92
L3
L97
R27
L337
L12
R75
L88
L57
R73
R78
L89
L91
L79
L53
L42
R27
R464
R427
R785
L8
R21
R49
R89
L59
R90
L296
L94
L854
L21
L84
L64
L25
R75
R50
L77
R69
L85
L84
R874
R274
L64
L84
L53
L51
L78
R35
L4
R78
R59
R99
R12
R23
R80
L14
R86
L62
L10
L76
L8
L85
R69
R87
L84
L603
L79
L57
R64
R36
R263
L27
R73
L22
L188
R14
R46
L23
L38
R38
L39
R239
R31
R69
L57
L80
L94
R22
L91
L27
R7
L27
R79
L32
L875
L459
L16
L34
L16
L34
L75
L6
L85
L60
L65
R21
L96
L9
R37
R72
R23
L23
L795
L310
R50
L32
L913
L52
R76
R81
R66
R29
L21
L73
R94
L29
L48
R77
R2
L2
L21
R87
R99
R71
R64
R93
R7
L57
R79
R995
R83
R19
R40
R41
L652
L93
R32
L39
R32
R46
L832
R6
R6
L6
R41
R59
L747
L376
L9
R27
L95
L77
R77
L48
R811
R37
L83
L17
R65
R352
L849
R95
L63
L85
L79
R42
R22
L95
L5
L63
L88
L39
L10
L18
R18
R54
R54
R92
R26
L62
L98
L166
L741
L306
L29
R17
L41
R13
L1
L68
R56
L22
R78
R44
L81
R97
L169
L47
R15
L33
R502
R52
L12
L27
L15
L503
L79
L38
L62
L29
R92
L63
L9
R12
R97
L52
R452
L214
R52
R84
L80
R27
L93
L97
L992
R69
L56
R45
R76
R33
R35
R946
L279
R63
R881
L60
R60
R70
R30
R31
R55
L223
R60
L2
R246
L472
L16
R644
R47
L858
L63
R54
R85
L40
R52
L122
L78
R540
R7
L47
R14
L11
L3
L460
L44
R2
R50
L48
R62
L62
L73
R73
L60
L40
L84
L473
R85
L41
L79
L108
R40
R91
R543
R81
L781
L74
L286
L555
R50
R2
R17
R53
R89
R23
R107
L68
L32
R65
R35
L36
R913
L597
L80
L34
L66
L96
L526
R32
R15
R75
L70
R21
L45
R1
R93
L45
L56
L99
R84
R60
L44
R44
L9
R65
L80
R80
L18
L82
R71
R29
L183
R83
R22
R78
R779
R21
L38
R82
R88
R68
L64
L214
R74
L96
R21
R68
L95
R6
L7
L93
L24
L94
R41
L254
R51
L2
R82
R64
L87
R21
R2
L31
R84
R347
R86
R72
L58
L37
R84
R57
L23
R94
R19
L94
L982
R86
L4
L46
L54
R66
L59
R83
L80
L98
L62
L23
L40
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L50
L540
L22
L29
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L58
R36
R47
L37
L6
L46
L7
L877
R80
R246
L972
R72
R385
R515
R96
R86
L23
R41
R81
R21
R16
R65
R958
R50
R9
L969
L48
L26
L22
L35
R6
L706
R43
L79
R50
R199
L13
L23
R19
L196
R47
L504
L24
L919
R611
L11
L59
L66
R341
L16
L155
R99
R80
R11
L98
R414
L31
L69
L97
L54
R908
R68
R54
L30
L302
R61
R46
R77
L38
R199
L23
L20
L227
L14
R23
R79
L99
L62
R190
R131
R179
L6
L694
L63
L14
L97
R67
R342
R765
R217
R83
L79
R39
R240
R57
R934
R691
R33
R28
R47
L14
R42
L44
R49
L754
R94
L33
R275
R95
R824
R90
L53
R948
R42
L13
R362
R80
L80
R84
L73
R8
L6
L89
R61
R50
R94
R71
R150
R72
R49
L9
L41
R79
L28
L3
R81
L50
L72
R85
R4
R57
R26
L16
L67
L34
R17
L183
L17
L72
R72
R78
L78
R28
L411
R485
R15
L59
R42
L18
L11
R29
L63
R94
R69
R91
R9
L62
R42
L41
R1
L99
R59
L132
R48
L516
L872
L82
L946
R46
R92
L722
L16
L48
R33
L21
L393
L71
L3
L34
L63
R54
R46
L95
L20
R15
R561
L36
L76
L18
L49
R18
L58
L74
R37
R95
R76
R24
R905
R960
R43
R14
R78
L709
L899
L45
R53
L34
R76
R231
L73
L867
R21
R46
L68
L47
L285
L865
L365
L70
R14
R86
R50
L57
R51
L89
L7
L817
L778
R47
R368
L82
R33
R58
L77
R440
L26
L53
L82
L692
R35
L22
R78
L978
R523
L966
R22
R32
L63
R52
R99
L49
R150
R71
R29
L16
R16
L150
R28
L78
L45
R8
L63
R39
L71
R78
R54
R31
R83
R90
L22
L67
R34
L42
R94
L96
R95
R35
R665
R48
R352
R55
R584
L896
L586
R43
R512
R57
R32
R99
R22
L2
R918
R46
L21
R337
R912
R47
R287
R67
L113
R31
R98
L292
L87
L55
L42
R46
R909
R79
R13
R1
L1
R68
L85
L66
R53
R30
R906
L6
L348
R92
R59
L20
L30
R99
L83
R31
R17
R14
L31
L25
L109
L66
L22
L6
L72
R285
R61
R54
R558
L58
L32
R84
L52
R66
L40
L45
L33
R22
R27
L29
R32
R36
L67
R98
L260
R18
L30
R811
L52
L769
L11
L65
L9
L69
L37
L94
R60
L78
L82
L552
L48
L461
L31
L88
R92
L14
L72
R74
L2
L59
R53
R95
L29
L58
R53
R47
L107
L93
R84
L441
R49
L50
L45
L4
R807
R89
L2
R94
L881
R184
L47
L17
R80
R13
R49
L2
R54
R92
R94
R61
L50
R19
L31
L799
L51
L70
L79
R485
L76
R91
L46
R577
R4
L29
R453
R9
R82
R50
R41
R97
L11
L94
R80
R6
R48
L48
R17
L36
L933
L91
R94
R57
L982
R55
R62
L62
L64
R43
L491
R37
L60
L65
L248
L52
R41
R11
L52
L48
R40
L92
R896
L512
R845
L871
L58
R22
L60
L22
L81
L57
R98
L13
R880
L27
L461
R88
R80
L20
R57
R28
R9
L21
R96
R30
R28
L4
R47
R5
L89
L74
L39
L69
R28
R41
L223
R81
R42
R23
R77
L16
R16
L95
R27
L32
R99
L70
L977
R48
L613
L88
L142
L282
R51
R74
R87
R33
R85
R95
L21
R50
L40
L89
L797
L46
L57
L601
R1
R36
R64
L43
R11
R98
L66
R3
R97
R76
L81
R82
L87
L90
L48
L7
R55
R19
R41
R941
R54
L55
R60
L33
L727
R918
R82
R672
R28
L59
R79
L263
R65
R4
R74
R159
L22
R78
R98
L13
L544
L97
R57
L16
R856
R91
L23
R76
R797
R89
R114
L7
L84
R91
R848
L35
R2
L88
R933
L2
L58
R85
L887
R67
L72
L93
L76
L24
L415
L63
R7
R588
L82
L45
L90
L1
R56
R14
L31
L77
L60
R60
R39
L656
R56
R93
R7
L32
L68
L94
R274
R20
L30
L70
L91
R2
L164
L307
R12
R55
R93
L12
R1
L715
R26
R90
L52
R344
L882
R10
R57
L67
R609
R43
R48
L29
L974
L5
L92
R6
R2
L340
R732
L21
L66
L91
R5
L90
R6
L11
R6
L66
R828
L22
R22
L234
L61
R90
R43
R62
L135
R11
L71
L35
L70
L19
R70
L51
L9
R428
L418
L858
R282
R70
R110
L31
R58
R63
L95
L32
R864
L422
R76
R34
L5
R93
R5
L17
R478
R26
L50
L50
R83
L76
R5
R24
L636
L60
L198
L942
R35
L45
R74
R936
R60
R11
L68
R41
L244
R39
L33
R93
R601
R38
L28
L60
R203
R24
L441
L52
R88
R28
L51
R151
R56
L56
R15
L94
R106
L14
L39
L74
R509
L36
R31
L4
R18
L18
R63
L12
R49
R25
R16
L53
R12
R210
R21
L31
R21
R37
R13
R319
R10
R42
R45
R13
L5
L95
R53
L761
R8
L78
L115
L7
R42
L99
R57
L40
L14
R36
R18
R652
L11
L41
R16
R292
R92
R10
L71
L39
L94
L6
L61
R61
L7
L4
L65
L57
R33
L33
L45
R74
R98
L76
R682
L60
L40
R47
L37
R76
R14
R43
R4
R471
L42
R26
L686
R11
R967
R47
L441
L488
R88
L7
L93
L11
L74
R85
R20
L27
L956
L37
L69
L88
R8
L91
L49
L10
L96
L45
L53
L7
L18
R90
R28
R41
R59
R725
R975
L85
L13
L91
R89
R44
R68
R59
L88
L87
L37
L40
R281
R141
R22
R37
R65
R35
L211
L56
R67
R499
R1
R380
R40
L8
R588
L64
R66
L802
L125
L45
L30
L90
L22
L88
L27
R39
R2
L57
R77
R66
L36
L25
R92
R69
R65
R21
R83
L431
L266
R75
R43
L140
L43
R40
R477
L56
L86
R18
L52
L207
R59
R99
R42
R524
R682
R645
R8
R48
L93
L55
L30
L70
L70
L30
L30
R742
L79
L233
R75
L39
R64
R70
R40
L26
L45
L39
L55
L42
R19
R88
R90
L57
L43
R35
R28
R13
R83
L43
R93
R87
R4
R74
L59
L15
L33
L67
R825
R91
R921
L87
L73
R98
L75
L58
L120
R78
L12
R12
L25
L75
L85
R72
L87
L17
L277
R80
L85
L1
R477
R27
R91
R68
L41
L924
R49
R53
L9
L391
R78
L532
R46
R15
R28
R37
L57
L315
L25
L8
R49
R8
R11
L86
L10
L139
L95
R71
L26
R90
L447
L92
R99
R14
R86
R83
L44
L419
L780
L74
R634
L429
R50
R42
R37
L93
L625
R126
L8
L19
L59
L22
L147
R47
R48
R5
L53
R687
R13
R45
R26
R29
R49
L61
R351
L24
R85
R444
R656
L13
L41
R54
L87
L43
L61
R58
R231
R735
R67
L20
L280
L61
L65
R987
L50
L252
R877
R359
L95
R14
L92
R7
R715
L644
R65
L74
L959
R53
L85
L57
R757
L45
L959
L96
R73
L473
R345
R73
L39
L179
L668
R46
L30
L63
R10
L25
R30
R468
R35
R96
L99
R7
L63
R73
L17
R85
R15
L51
R18
L67
L852
R3
R499
L50
L83
R583
R429
L25
R96
L123
R776
R45
R2
R201
L34
L18
L34
R63
R712
R46
R96
L363
R78
R23
R30
R26
L45
R19
L15
L85
R558
R42
L72
L539
R603
L92
R90
L172
L34
L88
L97
R1
L57
L13
L72
R42
R30
R15
R85
R69
R97
R4
L76
L61
R72
L35
L72
R83
R45
R44
R66
R5
R94
L60
R91
L63
R12
R4
L549
R10
L10
L31
R7
R924
L9
L21
R13
L83
R99
R120
L1
R182
L259
R59
L637
L63
L36
R952
R43
R55
R86
L97
L79
L505
R181
R483
L43
R7
L47
R884
L25
L93
R45
R83
L73
L21
L942
R342
L55
L54
R53
R56
R7
L530
L19
L58
L38
R755
R48
L53
R88
R32
R24
R85
L41
L76
R54
L19
R304
R28
L104
R389
L76
L80
L62
L58
R90
R676
L66
R98
R15
L66
R623
R39
L72
R90
L39
L288
R93
R7
R43
L743
R91
R9
R33
L17
R53
L2
L565
R16
R82
L62
R54
L692
R89
L10
L71
R504
L7
R95
R80
L56
L224
L297
R97
R32
R846
L65
L13
L3
R3
L48
R176
R972
L59
R59
L93
R79
R30
L2
L14
L320
R20
L72
R61
L4
R82
L93
R726
L89
R560
R29
R79
R72
L165
L36
L7
L32
R89
L4
L96
R749
R51
R903
L10
L71
R96
L18
R774
R75
L77
L72
L82
R82
R99
R31
R70
R88
R12
R50
L90
L99
L64
L69
R915
R57
L37
R37
R68
L53
L915
R27
L58
R302
R8
L73
L6
R814
L73
L41
L54
L13
L190
L83
L42
L18
L566
L234
R307
R97
L19
L75
L10
R66
L66
R87
R13
L97
L91
R66
L78
L3
R570
R38
L621
R23
R67
L50
L48
L3
R627
R68
L568
L15
L685
L34
R99
L27
L38
L25
R957
L38
R79
L790
L507
R24
R155
R45
R2
R51
L71
L19
R37
L33
R80
R53
R90
R59
L49
L238
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L233
R9
L992
R55
R61
R417
R83
R892
R3
L58
R63
L22
L74
R701
L5
R23
L90
L73
L81
L43
L89
L93
L54
L56
L44
L341
R5
R7
L36
L35
R79
R21
L834
R213
R5
R502
R14
R70
R30
R31
R69
R34
R347
L22
R39
R88
R782
L60
R80
R312
R579
L79
L19
L81
R113
R13
L26
R30
L43
L632
R45
L12
R994
L53
L79
R550
L32
R46
L14
R4
L61
L43
L9
R67
R44
L87
L15
L11
L62
L856
R40
R46
L92
L65
R2
R35
L34
L23
L924
R41
L42
R64
R70
L89
L243
R22
L79
L56
L344
L33
L67
L94
R94
R42
L42
R20
R93
L63
L77
L73
R28
R10
R82
L66
R46
R40
L36
L29
R841
R95
L55
R88
L44
L428
R28
R42
L11
R785
R930
L46
R448
L48
R99
R1
L391
R91
R74
R26
L59
R59
L92
R49
R39
L96
R22
R78
R6
R80
L89
L465
L98
L234
L23
R23
R64
R33
L37
R207
R59
L87
R3
L71
L18
L861
L64
R551
L79
L20
R790
L70
R45
R35
L92
R25
L13
L68
L32
L65
R65
L2
R657
L60
L95
R40
R760
L599
R99
R41
R41
R88
L70
L37
R7
L27
L43
R35
L449
L86
L74
R7
R92
L268
R43
R391
R55
R64
R51
R99
L685
L47
L28
L42
L58
R28
R372
L11
L89
R371
L3
L68
L38
R79
L43
L998
L9
R676
R556
R147
L622
R52
R6
R48
R7
R539
R192
R42
R66
R43
R526
L91
L548
L81
R851
R80
L57
R23
R13
R899
L33
R51
R37
R87
R95
L95
L62
L38
R66
L44
R37
L990
L69
R95
L94
L701
R98
L98
R42
L42
L36
L64
L10
R41
L31
L56
R56
L98
R62
R60
L24
R762
R941
R42
R524
R931
L757
R66
L66
L25
R44
R88
R16
R29
R80
R25
R52
R462
R19
R83
L673
L43
L88
R88
R962
R40
R98
R452
R48
R429
R27
L56
R253
R135
L78
R90
L59
R19
R40
R154
L53
L1
L36
R536
L88
L73
R85
L22
R65
R278
R16
R59
L19
R99
R98
L98
R46
L46
R80
L149
R82
L813
L82
R29
R53
L71
L38
R79
R75
L45
L40
R40
L42
L29
L29
L84
L92
L24
L21
R93
L14
R42
L68
L17
L37
L72
R17
L27
R4
L73
R48
R94
L69
R17
R51
L68
L38
L62
L44
L40
L44
R51
L39
R54
L14
L91
R30
R94
L57
R64
R36
R76
L24
L70
L82
L6
L17
R5
R47
L49
L19
L6
R29
R40
L46
R40
R32
R5
L20
L3
L3
R45
L15
R26
R22
R6
R7
L22
L21
L23
R33
R43
R33
L46
R29
L2
L1
L38
L22
R9
L13
L8
R40
L24
L44
R28
R37
L21
R38
R26
R34
L47
L19
L8
R48

Day 01 - Advent of Code 2025

--- Day 1: Secret Entrance ---

The Elves have good news and bad news.

The good news is that they've discovered project management! This has given them the tools they need to prevent their usual Christmas emergency. For example, they now know that the North Pole decorations need to be finished soon so that other critical tasks can start on time.

The bad news is that they've realized they have a different emergency: according to their resource planning, none of them have any time left to decorate the North Pole!

To save Christmas, the Elves need you to finish decorating the North Pole by December 12th.

Collect stars by solving puzzles. Two puzzles will be made available on each day; the second puzzle is unlocked when you complete the first. Each puzzle grants one star. Good luck!

You arrive at the secret entrance to the North Pole base ready to start decorating. Unfortunately, the password seems to have been changed, so you can't get in. A document taped to the wall helpfully explains:

"Due to new security protocols, the password is locked in the safe below. Please see the attached document for the new combination."

The safe has a dial with only an arrow on it; around the dial are the numbers 0 through 99 in order. As you turn the dial, it makes a small click noise as it reaches each number.

The attached document (your puzzle input) contains a sequence of rotations, one per line, which tell you how to open the safe. A rotation starts with an L or R which indicates whether the rotation should be to the left (toward lower numbers) or to the right (toward higher numbers). Then, the rotation has a distance value which indicates how many clicks the dial should be rotated in that direction.

So, if the dial were pointing at 11, a rotation of R8 would cause the dial to point at 19. After that, a rotation of L19 would cause it to point at 0.

Because the dial is a circle, turning the dial left from 0 one click makes it point at 99. Similarly, turning the dial right from 99 one click makes it point at 0.

So, if the dial were pointing at 5, a rotation of L10 would cause it to point at 95. After that, a rotation of R5 could cause it to point at 0.

The dial starts by pointing at 50.

You could follow the instructions, but your recent required official North Pole secret entrance security training seminar taught you that the safe is actually a decoy. The actual password is the number of times the dial is left pointing at 0 after any rotation in the sequence.

For example, suppose the attached document contained the following rotations:

L68
L30
R48
L5
R60
L55
L1
L99
R14
L82

Following these rotations would cause the dial to move as follows:

  • The dial starts by pointing at 50.
  • The dial is rotated L68 to point at 82.
  • The dial is rotated L30 to point at 52.
  • The dial is rotated R48 to point at *0*.
  • The dial is rotated L5 to point at 95.
  • The dial is rotated R60 to point at 55.
  • The dial is rotated L55 to point at *0*.
  • The dial is rotated L1 to point at 99.
  • The dial is rotated L99 to point at *0*.
  • The dial is rotated R14 to point at 14.
  • The dial is rotated L82 to point at 32.

Because the dial points at 0 a total of three times during this process, the password in this example is *3*.

Analyze the rotations in your attached document. What's the actual password to open the door?

Your puzzle answer was 1081.

The first half of this puzzle is complete! It provides one gold star: *

--- Part Two ---

You're sure that's the right password, but the door won't open. You knock, but nobody answers. You build a snowman while you think.

As you're rolling the snowballs for your snowman, you find another security document that must have fallen into the snow:

"Due to newer security protocols, please use password method 0x434C49434B until further notice."

You remember from the training seminar that "method 0x434C49434B" means you're actually supposed to count the number of times any click causes the dial to point at 0, regardless of whether it happens during a rotation or at the end of one.

Following the same rotations as in the above example, the dial points at zero a few extra times during its rotations:

  • The dial starts by pointing at 50.
  • The dial is rotated L68 to point at 82; during this rotation, it points at 0 once.
  • The dial is rotated L30 to point at 52.
  • The dial is rotated R48 to point at *0*.
  • The dial is rotated L5 to point at 95.
  • The dial is rotated R60 to point at 55; during this rotation, it points at 0 once.
  • The dial is rotated L55 to point at *0*.
  • The dial is rotated L1 to point at 99.
  • The dial is rotated L99 to point at *0*.
  • The dial is rotated R14 to point at 14.
  • The dial is rotated L82 to point at 32; during this rotation, it points at 0 once.

In this example, the dial points at 0 three times at the end of a rotation, plus three more times during a rotation. So, in this example, the new password would be *6*.

Be careful: if the dial were pointing at 50, a single rotation like R1000 would cause the dial to point at 0 ten times before returning back to 50!

Using password method 0x434C49434B, what is the password to open the door?

Answer:

Although it hasn't changed, you can still get your puzzle input.

You can also [Shareon Bluesky Twitter Mastodon] this puzzle.