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+++ b/2023/day15.input
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diff --git a/2023/day16.test b/2023/day16.test
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diff --git a/2023/day17.input b/2023/day17.input
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diff --git a/2023/day3.test b/2023/day3.test
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+Card 200: 86 29 15 97 91 10 62 68 19 75 |  8 12 68 18 36 62 37 16 41 97  5 64 81 80 75  6 24 59 23 33 79  1 22 63 89
+Card 201: 16 72 24 22 23 44 67  3 27 85 | 54 78 25 59 87  6 98 81 49 77 83 33 82 99 90 32 65 57 30 36 28 95 92 17 71
+Card 202: 69 11 38 33 26 39 84 57 98 36 | 46 35 45 80 94 26 52 92 76 90 55 31 18 73 30 15  7 39  4 34 19 47 21 29 54
+Card 203: 62 87 19 82  3 28 64  9 93 80 | 50 11 71 78 36 25 66 40 43 51 81 48 44 27 75 73 14 26 99 49 69  6 55 33 67
+Card 204: 82 64 58 18 73 13  2 71 24 49 |  9 61 47 31  5 89 78 99 40 54 23 68 38 95 69 84 53 27 45 33 87 90 93 44 60
diff --git a/2023/day4.test b/2023/day4.test
new file mode 100644
index 0000000..9bdb874
--- /dev/null
+++ b/2023/day4.test
@@ -0,0 +1,6 @@
+Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53
+Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
+Card 3:  1 21 53 59 44 | 69 82 63 72 16 21 14  1
+Card 4: 41 92 73 84 69 | 59 84 76 51 58  5 54 83
+Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
+Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11
diff --git a/2023/day5.input b/2023/day5.input
new file mode 100644
index 0000000..111babe
--- /dev/null
+++ b/2023/day5.input
@@ -0,0 +1,224 @@
+seeds: 3136945476 509728956 1904897211 495273540 1186343315 66026055 1381149926 11379441 4060485949 190301545 444541979 351779229 1076140984 104902451 264807001 60556152 3676523418 44140882 3895155702 111080695
+
+seed-to-soil map:
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+light-to-temperature map:
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+
+humidity-to-location map:
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diff --git a/2023/day5.test b/2023/day5.test
new file mode 100644
index 0000000..172cb84
--- /dev/null
+++ b/2023/day5.test
@@ -0,0 +1,36 @@
+seeds: 79 14 55 13
+
+seed-to-soil map:
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+
+soil-to-fertilizer map:
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+
+fertilizer-to-water map:
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+
+water-to-light map:
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+light-to-temperature map:
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+
+temperature-to-humidity map:
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+
+humidity-to-location map:
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+
+
+
diff --git a/2023/day6.input b/2023/day6.input
new file mode 100644
index 0000000..2a9ca07
--- /dev/null
+++ b/2023/day6.input
@@ -0,0 +1,2 @@
+Time:        48     87     69     81
+Distance:   255   1288   1117   1623
diff --git a/2023/day7.input b/2023/day7.input
new file mode 100644
index 0000000..12bfd93
--- /dev/null
+++ b/2023/day7.input
@@ -0,0 +1,1000 @@
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+A9444 506
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+7J64K 946
+88632 587
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+J8JQ8 909
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+5T663 262
+KJ698 311
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+JJJJJ 901
+266Q8 446
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+82832 855
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+54483 176
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+7Q39K 601
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+J6A6T 132
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+98KK9 165
+Q7777 720
+K44KK 850
+4447K 292
+33933 986
+A228A 187
+Q76TT 30
+775J9 763
+Q4877 958
+Q22QQ 462
+KKQ2A 418
+Q4Q44 677
+666T6 678
+3688K 690
+69KAA 766
+3J8K8 574
+TTA55 675
+A8AAA 62
+K39K9 641
+88989 172
+A3JK3 705
+9J999 105
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+AK749 600
+9TJK5 465
+73334 799
+AAA4A 774
+22292 212
+8K653 2
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+Q3673 124
+59563 636
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+AAATA 412
+9K5K2 75
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+69629 16
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+3393J 999
+A492Q 892
+76JT7 468
+7KQ64 420
+TA93Q 33
+JQ694 209
+TK983 283
+383JK 965
+ATT99 805
+Q3QQQ 193
+QQQQ2 731
+99T4A 13
+QQQQJ 137
+KK22K 782
+JJ354 864
+JKTTK 367
+99K29 559
+4993J 585
+Q7727 291
+6373J 747
+2J2AJ 370
+3533A 106
+KT93Q 85
+9T4T2 814
+KK79K 276
+8T9A5 390
+8828J 335
+TT2TT 569
+K7747 20
+A4444 712
+44644 588
+444AQ 363
+AA3AA 450
+5KA99 754
+Q45J5 679
+J4443 444
+82A53 249
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+A76A2 201
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+2T45A 545
+QJ3Q3 97
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+K849A 505
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+J4J44 489
+5585T 119
+AAT2A 688
+64646 334
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+9KQ52 321
+76367 393
+96J42 633
+8Q848 69
+2J777 380
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+4KAA9 89
+7TJ48 562
+35333 107
+9992T 295
+44448 885
+77877 281
+7AAA6 459
+577JK 595
+J8655 990
+T43J4 723
+88442 368
+A7T7T 745
+6Q5QQ 664
+29J2T 316
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+Q7JKT 768
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+55544 706
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+K969J 128
+7754Q 290
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+4849K 821
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+79K48 339
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+Q7999 244
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+66J64 21
+QK4J5 396
+Q2JTK 886
+6923T 796
+5TTT5 100
+8K929 345
+22826 693
+4TJ53 458
+55855 302
+94959 520
+82A5A 912
+KT7K9 464
+55KJK 655
+Q76QK 77
+A75A9 263
+94888 924
+59578 289
+87TK8 648
+4464J 382
+K8887 621
+Q4QAQ 802
+J6AAA 149
+AA3AQ 47
+25257 976
+KQK22 818
+TQ6A2 250
+J7777 138
+4T3T4 717
+QQJJQ 676
+J7TT2 86
+4K95Q 482
+2KJKJ 953
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+22322 392
+T86J9 854
+QQQ88 359
+J84J8 707
+26226 660
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+33337 486
+J4844 501
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+6J66J 527
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+7TJ7Q 526
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+KKK8K 362
+74J47 926
+T633T 410
+3K355 448
+89367 736
+Q6556 811
+58788 697
+A2Q74 479
+TT53T 880
+7J3A6 342
+JK8KK 230
+597J6 46
+TTT49 324
+2222A 273
+T5223 91
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+37373 776
+KKKQJ 327
+77K9J 280
+TT3T3 711
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diff --git a/2023/day7.test b/2023/day7.test
new file mode 100644
index 0000000..e1303a7
--- /dev/null
+++ b/2023/day7.test
@@ -0,0 +1,6 @@
+32T3K 765
+T55J5 684
+KK677 28
+KTJJT 220
+QQQJA 483
+
diff --git a/2023/day8.input b/2023/day8.input
new file mode 100644
index 0000000..d95e19b
--- /dev/null
+++ b/2023/day8.input
@@ -0,0 +1,716 @@
+LRRLRRLLRRRLRRLRLRRRLRRLRRRLRLLRRRLRRRLRLRRRLRRLRRLRLRLLLRRRLRRRLRRLRRLRLRRRLRRLLRRLRRLRLLRLRLRRLRLLRLRLRRRLRRLRLLRLRLLRRLRLRRLLLRLRRLRRRLLLRRLRLRRRLLRRLLLRRRLRRRLLLRRLLRLRRLRLRRLLLRLRRLLLLRRLLRRRLRRLRRLRLRLLRLRRRLLRRLLRRLRRLRRLRRLRLLRRLRRRLRLRLLLRRRLLRRRLRRLRRLLLLRRRR
+
+VRN = (CSM, GPD)
+XDT = (QBK, PJR)
+HVC = (MKM, TJS)
+KRH = (BHN, PXB)
+GTX = (VFD, TXR)
+BQB = (MQV, PFQ)
+TDV = (VSG, MJX)
+VJM = (QHP, XMB)
+KLG = (QLJ, HCV)
+TSM = (JPG, DNP)
+KHS = (QNR, DXJ)
+FXM = (PHF, PHF)
+RMV = (BMM, KHS)
+QXL = (BKG, TLP)
+MHS = (QXL, CFQ)
+TBT = (TVT, BRD)
+QXS = (GPP, RND)
+XLL = (JHQ, LDV)
+PBQ = (VXK, RJR)
+FXB = (HMN, THX)
+DPF = (GLX, GNC)
+HVG = (HJF, SCH)
+QMN = (DQJ, GMN)
+MBS = (PFX, JHG)
+VGL = (FHX, CCK)
+QLV = (BLT, FDR)
+MNS = (BDB, BMJ)
+MMT = (TSM, SFR)
+NRP = (FKB, QPH)
+XFQ = (GTS, CCQ)
+XFF = (HKG, NVL)
+TXR = (VHQ, CKP)
+VPL = (GHC, VMT)
+SGC = (BGM, MJV)
+SMS = (GJV, LSC)
+BVC = (PRH, FJJ)
+JHQ = (VJQ, XTX)
+RJF = (GKK, NKX)
+RJR = (JJQ, JTK)
+VHQ = (JPS, JPS)
+SFR = (JPG, DNP)
+RDP = (GPD, CSM)
+GGQ = (MVX, XBP)
+XGK = (GBB, VPH)
+XBH = (PTH, GSL)
+MKG = (RBP, MGG)
+FSG = (KFC, RMB)
+NHC = (RQG, CVF)
+SSV = (MVF, QFP)
+RLP = (FXC, HCP)
+FBZ = (FJF, CRJ)
+HFL = (FKB, QPH)
+NBM = (QBD, XGK)
+NSP = (QKG, NDN)
+TQF = (RMH, TDB)
+RBB = (QTC, HPT)
+CVF = (BSV, VTR)
+XQG = (LFJ, JXD)
+KXF = (CRJ, FJF)
+MQC = (MQL, BSL)
+RCC = (NHC, QLC)
+TNT = (VKQ, NSX)
+TVN = (NDN, QKG)
+SCH = (FXB, NTM)
+CVD = (XLJ, XDT)
+QVF = (MQR, RDB)
+GXS = (HCK, SHD)
+KBD = (JHG, PFX)
+KXV = (HVQ, QCJ)
+MQR = (RNQ, SVC)
+CBC = (SXB, BVC)
+GKK = (HDR, LTF)
+FRT = (CFQ, QXL)
+VMT = (SQQ, DBB)
+QPV = (NVQ, VVV)
+XGD = (MPL, PMQ)
+MNT = (JDD, NQC)
+RGT = (QHD, SQP)
+HXV = (RQD, RRX)
+LGR = (FHX, CCK)
+PHF = (CBV, TMC)
+BTP = (JSC, QMN)
+CXS = (SCH, HJF)
+MQV = (FGJ, QPD)
+HRZ = (CCX, BCF)
+DDB = (DJK, CVD)
+XNL = (QLJ, HCV)
+GLX = (MGN, CFV)
+QCJ = (NDK, XBR)
+XBX = (CQM, VKD)
+QPH = (XBH, CFG)
+NSL = (LFJ, JXD)
+DJQ = (VMN, STS)
+RNV = (XFF, KSR)
+JTR = (QLG, XRD)
+VVV = (MDH, KHK)
+TLR = (DMH, NXC)
+GBH = (GLS, XLK)
+LRN = (QRM, FMC)
+BRM = (DCK, DSK)
+GQS = (FXV, QPV)
+XMT = (NHF, RXG)
+KLR = (HFN, KDR)
+SVH = (RMR, JLC)
+QSG = (KQC, CMH)
+VVX = (XGM, FNX)
+BCF = (LNR, MTS)
+RPJ = (RCC, CKG)
+JJD = (NRP, HFL)
+FGP = (MFS, RBB)
+BJX = (BTD, KSC)
+PQC = (VMN, STS)
+JPG = (RQL, CSQ)
+SLK = (JJC, BPJ)
+JTK = (XHN, BFH)
+HCV = (BRF, VPT)
+VPH = (BVS, RRT)
+MSH = (JQF, XFJ)
+JHL = (QPF, QPF)
+FGD = (MPC, TVB)
+DCB = (JBC, XFB)
+RKN = (TSL, VQG)
+QBQ = (QLV, NRT)
+MQX = (JSX, MCV)
+XHX = (FNX, XGM)
+DTL = (JDM, BDX)
+LST = (JHL, CQN)
+VGR = (HQV, HRZ)
+CTQ = (XCF, TJK)
+SQP = (HHB, NBM)
+RRL = (TSL, VQG)
+NNM = (DDS, XSF)
+KHK = (HSG, NDF)
+MGN = (VXT, VGV)
+TLB = (DPK, MLV)
+NMM = (TRR, XJH)
+SJG = (XRJ, XBX)
+GSC = (RRL, RKN)
+KDR = (PSJ, TBM)
+LRP = (SQP, QHD)
+DKF = (MVR, QQB)
+FHC = (BPT, BKC)
+PLT = (JGG, GGQ)
+XRD = (HMH, PBQ)
+RHP = (JPD, XVL)
+MXF = (MQR, RDB)
+DML = (BRD, TVT)
+CKP = (JPS, RBS)
+BFK = (BCL, TLK)
+KSR = (NVL, HKG)
+XQF = (BMM, KHS)
+BVJ = (CBL, PLC)
+BCS = (RQF, GTB)
+JCC = (VTT, VPQ)
+BCL = (BNV, PDB)
+HCK = (DDB, CBX)
+SVG = (FGD, VQL)
+BLT = (XNK, LHM)
+MVQ = (LRG, NPB)
+RND = (QCK, QRN)
+HFR = (FBT, CLS)
+KNK = (XDS, BCK)
+XBB = (BRM, FDC)
+XGM = (FFC, GJX)
+PTN = (TQF, QKP)
+RNQ = (GSC, XKH)
+TPT = (CMK, KXT)
+HPL = (CKB, QLR)
+MVX = (QSG, TKJ)
+QFP = (RLP, RSF)
+GXF = (LNB, VNJ)
+QHD = (NBM, HHB)
+KSS = (LLH, PFK)
+MFD = (XGJ, GGS)
+JJQ = (XHN, BFH)
+JDD = (HXV, FVH)
+CFR = (FXM, FXM)
+FDR = (XNK, LHM)
+DHG = (BRS, TLR)
+TDB = (SBS, XBB)
+BVS = (GQH, BFS)
+DGZ = (TMC, CBV)
+HQD = (JSC, QMN)
+TMZ = (XFB, JBC)
+BRF = (MBF, KGJ)
+RQG = (VTR, BSV)
+CSQ = (FTS, RHR)
+FFJ = (QCL, CTQ)
+XKH = (RRL, RKN)
+VJQ = (BTL, GQS)
+NGK = (JGG, GGQ)
+RQN = (GVG, SJN)
+GRR = (RNV, FHF)
+LSR = (VBL, SLK)
+VQG = (QBV, NJV)
+BHK = (BVJ, LJR)
+BRS = (DMH, NXC)
+NKX = (LTF, HDR)
+QBD = (GBB, VPH)
+RGQ = (CLM, FHK)
+VXX = (KRH, VGN)
+KRF = (VFQ, SMN)
+XFR = (XGD, RMM)
+JGC = (JGM, PFR)
+SHD = (DDB, CBX)
+QKG = (QTS, GXP)
+CDL = (GLX, GNC)
+RBP = (HKK, CMN)
+CLN = (HDG, BHM)
+XFX = (RNV, FHF)
+AAA = (DXX, SVG)
+FXC = (MMT, KLS)
+PTF = (SKF, SDF)
+QPF = (RQF, RQF)
+DTB = (HQV, HQV)
+RRF = (FNV, MKG)
+MGG = (HKK, CMN)
+NDF = (KMD, FFH)
+DVL = (RKL, CLC)
+JRQ = (BXV, BRB)
+HVM = (DRT, SSV)
+BHM = (KNK, BPP)
+TDT = (DPS, VCP)
+JPC = (DCH, FHD)
+RSF = (FXC, HCP)
+KSX = (BVJ, LJR)
+NLT = (LTB, QBQ)
+SBD = (NKX, GKK)
+VQL = (MPC, TVB)
+JXD = (MLK, LHN)
+XNN = (TNT, LPQ)
+HMH = (RJR, VXK)
+JGG = (MVX, XBP)
+PTP = (MVQ, NPS)
+FQC = (XQF, RMV)
+FXT = (TDH, JGD)
+RGP = (CPN, KGF)
+BTD = (NKN, NTQ)
+BGM = (NRJ, CJN)
+RMM = (PMQ, MPL)
+DQJ = (DPF, CDL)
+TVT = (TFJ, VJM)
+TGL = (CGS, SJG)
+NHF = (HVC, LVM)
+NMK = (GRR, XFX)
+QRN = (MMP, XSL)
+FFH = (DJQ, PQC)
+PDJ = (NQC, JDD)
+CGS = (XBX, XRJ)
+NTQ = (RXX, FLX)
+CFB = (TVC, PTP)
+GXK = (FLC, GXS)
+RBS = (DCB, TMZ)
+CFQ = (TLP, BKG)
+QHP = (KVX, GSG)
+HDJ = (RPH, QPK)
+VXT = (GXF, JKM)
+NCM = (NJL, TGL)
+HFN = (TBM, PSJ)
+JGF = (CFB, NMC)
+JDM = (CLN, PHJ)
+DJS = (RMR, JLC)
+RDB = (RNQ, SVC)
+RRX = (HQD, BTP)
+HHS = (MXF, QVF)
+MMP = (GTX, HKC)
+JRK = (KKP, PTN)
+TRR = (VGD, HGC)
+JKM = (LNB, VNJ)
+BRD = (TFJ, VJM)
+TLK = (BNV, PDB)
+QTS = (CHL, LSR)
+BPP = (XDS, BCK)
+RXX = (BKP, TLS)
+VFD = (VHQ, VHQ)
+BQF = (DHG, DQC)
+XDL = (QVF, MXF)
+ZZZ = (SVG, DXX)
+GGB = (LTB, QBQ)
+QTN = (JHL, CQN)
+BVK = (BHQ, SSG)
+VGB = (BXV, BRB)
+QLR = (XFR, KNM)
+QBK = (KNC, VJX)
+BMJ = (JLK, TDV)
+FDC = (DSK, DCK)
+XDS = (SMS, TVR)
+GBC = (NGK, PLT)
+HPT = (XHQ, SXT)
+FHK = (JCC, FJS)
+KNM = (RMM, XGD)
+GTB = (KLR, JVZ)
+VCT = (PTN, KKP)
+LDV = (XTX, VJQ)
+KTK = (MQV, PFQ)
+TVC = (MVQ, NPS)
+BXV = (XLL, KDL)
+BFA = (BCF, CCX)
+CCF = (CLM, FHK)
+JGS = (VCP, DPS)
+RVK = (MKJ, QLH)
+FNX = (FFC, GJX)
+XBP = (QSG, TKJ)
+LMJ = (FPH, JVL)
+HKG = (VXX, RNX)
+KMD = (DJQ, PQC)
+BRB = (XLL, KDL)
+NDK = (DJS, SVH)
+BSV = (XVC, QXS)
+TLS = (FSJ, MNS)
+CRJ = (SGC, RNH)
+BNV = (QSF, FSG)
+SMN = (MNK, QGN)
+JVV = (TRN, DVL)
+JJC = (HBT, RPJ)
+KSB = (XVL, JPD)
+JJT = (TLB, DTJ)
+TSL = (QBV, NJV)
+GNV = (GCS, JLR)
+HJF = (FXB, NTM)
+VMN = (CFR, CFR)
+GVG = (XDL, HHS)
+LNB = (HMP, XMP)
+RTL = (FXT, RCT)
+XVC = (RND, GPP)
+GNS = (MFS, RBB)
+XTG = (LRM, DKQ)
+JVZ = (KDR, HFN)
+QQB = (XTG, GFG)
+HMN = (FHC, FMN)
+XLC = (FXT, RCT)
+CKG = (QLC, NHC)
+NJB = (DVL, TRN)
+VCP = (LRF, HPL)
+KQJ = (MXH, MXH)
+GJV = (TPT, QNJ)
+CCX = (LNR, MTS)
+DTJ = (MLV, DPK)
+HDX = (JSX, MCV)
+XRJ = (VKD, CQM)
+DMH = (RGP, KPR)
+QGN = (VRF, QDL)
+JSC = (DQJ, GMN)
+BPT = (LLB, XNN)
+CJN = (JJT, PGM)
+XDV = (XVD, HJH)
+JHG = (LLF, MLJ)
+NKN = (FLX, RXX)
+TGP = (XJH, TRR)
+TLP = (XLC, RTL)
+HQT = (SSN, BPS)
+BKP = (MNS, FSJ)
+VPT = (KGJ, MBF)
+JSJ = (PFK, LLH)
+CBX = (DJK, CVD)
+TJK = (VGL, LGR)
+THP = (TGL, NJL)
+NSX = (SQL, GNV)
+JQF = (VDM, JJD)
+SDF = (JPC, KRV)
+XNK = (HDJ, MQJ)
+DSD = (SJN, GVG)
+SBS = (FDC, BRM)
+FPH = (NCM, THP)
+LMR = (KQJ, BGV)
+VKQ = (SQL, GNV)
+FMC = (CPV, GBC)
+HHB = (QBD, XGK)
+HVQ = (NDK, XBR)
+KXT = (JKG, NLS)
+GJX = (TVP, JTR)
+JLT = (MHM, MSH)
+VNJ = (HMP, XMP)
+TDH = (JGF, GGD)
+VPQ = (HDX, MQX)
+SKF = (JPC, KRV)
+NXT = (RXG, NHF)
+TRN = (CLC, RKL)
+RRT = (BFS, GQH)
+JFJ = (SXB, BVC)
+KBR = (CGD, JGC)
+PGG = (HFR, TJJ)
+CMK = (JKG, NLS)
+CBV = (FCX, KBR)
+GMN = (DPF, CDL)
+BTL = (QPV, FXV)
+PFX = (MLJ, LLF)
+DCT = (XLK, GLS)
+PGM = (DTJ, TLB)
+NVL = (VXX, RNX)
+RPD = (TLK, BCL)
+QDL = (FFJ, SFH)
+JVL = (THP, NCM)
+NVQ = (MDH, KHK)
+TMC = (FCX, KBR)
+LPQ = (NSX, VKQ)
+RHR = (PPL, LCD)
+JSX = (DHM, PMS)
+DPK = (KBD, MBS)
+LTF = (PGG, QPN)
+BPS = (GXK, HCM)
+HKC = (VFD, TXR)
+PXB = (RPN, BQF)
+FLX = (TLS, BKP)
+PJR = (VJX, KNC)
+PDB = (QSF, FSG)
+NMC = (TVC, PTP)
+MLP = (MSH, MHM)
+PMQ = (KXV, QFJ)
+FKB = (XBH, CFG)
+JRV = (SMN, VFQ)
+SQL = (GCS, JLR)
+DXX = (FGD, VQL)
+XMM = (GMG, LRN)
+PFK = (HDL, XFQ)
+XSL = (GTX, HKC)
+CLC = (JRQ, VGB)
+LMH = (KXF, FBZ)
+NMX = (KSC, BTD)
+GTJ = (KLG, XNL)
+THX = (FMN, FHC)
+RMH = (XBB, SBS)
+SSG = (MFD, KFP)
+QNR = (RBG, HNG)
+DSK = (LMJ, FRP)
+GQP = (FXM, XVT)
+MFS = (QTC, HPT)
+VHX = (VBD, RDD)
+SQS = (GTJ, MSR)
+LJR = (CBL, PLC)
+QSF = (KFC, KFC)
+DHM = (VFJ, DTL)
+MDH = (NDF, HSG)
+SSN = (HCM, GXK)
+HCM = (FLC, GXS)
+PQX = (FGG, BXR)
+DQC = (BRS, TLR)
+KRV = (DCH, FHD)
+FNH = (SKF, SDF)
+LFJ = (LHN, MLK)
+MVR = (GFG, XTG)
+HBT = (RCC, CKG)
+VKD = (NMK, PFV)
+TKJ = (KQC, CMH)
+MRH = (RHV, ZZZ)
+CKB = (XFR, KNM)
+BMM = (DXJ, QNR)
+KDL = (JHQ, LDV)
+VFJ = (BDX, JDM)
+PLC = (PND, GNP)
+MNK = (QDL, VRF)
+MXT = (RMV, XQF)
+TJS = (PTF, FNH)
+PHJ = (BHM, HDG)
+FSJ = (BDB, BMJ)
+CFV = (VGV, VXT)
+XVD = (CBF, SQS)
+TFJ = (QHP, XMB)
+CPV = (PLT, NGK)
+VTR = (XVC, QXS)
+BKC = (XNN, LLB)
+NPS = (NPB, LRG)
+FXV = (NVQ, VVV)
+FTS = (PPL, LCD)
+HMP = (QMD, SNX)
+VBD = (DTB, DTB)
+VFQ = (QGN, MNK)
+KFP = (GGS, XGJ)
+BHN = (RPN, BQF)
+PFV = (GRR, XFX)
+QMD = (MGK, XDV)
+MLK = (RPD, BFK)
+GFG = (DKQ, LRM)
+NLS = (BQB, KTK)
+XLK = (HVG, CXS)
+LSC = (QNJ, TPT)
+FNV = (RBP, MGG)
+HKK = (RCX, MQC)
+GPD = (NSL, XQG)
+RQL = (RHR, FTS)
+HDB = (GHC, VMT)
+HJH = (SQS, CBF)
+QTC = (SXT, XHQ)
+TRS = (BXR, FGG)
+MTS = (DML, TBT)
+RHV = (DXX, SVG)
+XVL = (FGP, GNS)
+GSG = (RRF, CSP)
+VBL = (JJC, BPJ)
+CCK = (RJF, SBD)
+QPN = (TJJ, HFR)
+PRH = (TGP, NMM)
+PQT = (TRS, PQX)
+QKP = (RMH, TDB)
+XMP = (SNX, QMD)
+QPD = (KRF, JRV)
+RQD = (HQD, BTP)
+XVT = (PHF, DGZ)
+GXP = (CHL, LSR)
+LHM = (MQJ, HDJ)
+STS = (CFR, GQP)
+FJJ = (NMM, TGP)
+MPC = (CCF, RGQ)
+MKM = (PTF, FNH)
+QVH = (VBD, VBD)
+XMB = (KVX, GSG)
+CHL = (VBL, SLK)
+XBR = (DJS, SVH)
+KPR = (CPN, KGF)
+MQL = (KSB, RHP)
+CQM = (PFV, NMK)
+XHQ = (HCR, HVM)
+FFC = (JTR, TVP)
+FMN = (BPT, BKC)
+SNX = (MGK, XDV)
+KNC = (QVJ, NNM)
+DPS = (LRF, HPL)
+GBB = (BVS, RRT)
+BFH = (XMM, XQL)
+GLS = (HVG, CXS)
+RXG = (LVM, HVC)
+MPL = (QFJ, KXV)
+NXC = (KPR, RGP)
+NJV = (TVN, NSP)
+LLB = (LPQ, TNT)
+SXT = (HVM, HCR)
+LLH = (HDL, XFQ)
+MLV = (KBD, MBS)
+CBF = (GTJ, MSR)
+JBC = (KTX, QQG)
+FLC = (SHD, HCK)
+FRP = (FPH, JVL)
+BHQ = (MFD, KFP)
+LNR = (DML, TBT)
+CSP = (MKG, FNV)
+GHC = (SQQ, DBB)
+NRT = (BLT, FDR)
+VTT = (HDX, MQX)
+HSG = (FFH, KMD)
+VGA = (CBV, TMC)
+KLS = (TSM, SFR)
+PFQ = (FGJ, QPD)
+MKJ = (JLT, MLP)
+MFX = (RVK, NSF)
+QNJ = (KXT, CMK)
+QBV = (NSP, TVN)
+MSR = (KLG, XNL)
+NSF = (QLH, MKJ)
+DKQ = (JDR, DQQ)
+PLH = (RVK, NSF)
+JKG = (BQB, KTK)
+LVM = (MKM, TJS)
+QLJ = (VPT, BRF)
+FVH = (RRX, RQD)
+MJX = (DCT, GBH)
+QLH = (MLP, JLT)
+NPB = (XMT, NXT)
+HDL = (CCQ, GTS)
+JPS = (DCB, DCB)
+CQN = (QPF, BCS)
+GNP = (DSD, RQN)
+JLK = (MJX, VSG)
+PMS = (DTL, VFJ)
+BFS = (JGS, TDT)
+XJH = (VGD, HGC)
+VRF = (SFH, FFJ)
+BCK = (SMS, TVR)
+DRT = (QFP, MVF)
+PND = (DSD, RQN)
+VSG = (GBH, DCT)
+VGV = (JKM, GXF)
+FHD = (MXT, FQC)
+GPP = (QRN, QCK)
+BDX = (CLN, PHJ)
+LLF = (HQT, DCL)
+DXA = (HFN, KDR)
+MCV = (DHM, PMS)
+NTM = (HMN, THX)
+JLC = (RDP, VRN)
+HQV = (BCF, CCX)
+NDN = (QTS, GXP)
+QVJ = (DDS, XSF)
+MQJ = (RPH, QPK)
+FGJ = (KRF, JRV)
+LHN = (BFK, RPD)
+MXH = (RHV, RHV)
+HGC = (DNN, PQT)
+MHM = (XFJ, JQF)
+JGD = (JGF, GGD)
+FCX = (JGC, CGD)
+GCS = (LST, QTN)
+RCX = (BSL, MQL)
+XGJ = (VCT, JRK)
+SXB = (FJJ, PRH)
+LRG = (XMT, NXT)
+XSF = (LRP, RGT)
+DNP = (CSQ, RQL)
+RKL = (VGB, JRQ)
+KVX = (CSP, RRF)
+JPD = (FGP, GNS)
+GNC = (MGN, CFV)
+PFR = (MHS, FRT)
+DCK = (LMJ, FRP)
+KKP = (TQF, QKP)
+XQL = (GMG, LRN)
+QCL = (TJK, XCF)
+TVP = (XRD, QLG)
+HDR = (QPN, PGG)
+HLN = (BHQ, SSG)
+GGS = (VCT, JRK)
+SJN = (HHS, XDL)
+DBB = (BHK, KSX)
+QPK = (MFX, PLH)
+MBF = (NLT, GGB)
+BDB = (TDV, JLK)
+KSC = (NKN, NTQ)
+CPN = (HDB, VPL)
+TVB = (RGQ, CCF)
+VJX = (NNM, QVJ)
+FBT = (JLL, LMR)
+TVR = (GJV, LSC)
+RNX = (KRH, VGN)
+RPH = (MFX, PLH)
+VJA = (JBC, XFB)
+CLS = (JLL, LMR)
+PSJ = (DKF, MSL)
+QLG = (PBQ, HMH)
+DXJ = (HNG, RBG)
+XFB = (KTX, QQG)
+TJJ = (FBT, CLS)
+KFC = (JRF, JRF)
+XFJ = (JJD, VDM)
+RCT = (TDH, JGD)
+RNH = (BGM, MJV)
+VGD = (PQT, DNN)
+KQC = (JFJ, CBC)
+PPL = (JSJ, KSS)
+HCR = (DRT, SSV)
+XLJ = (PJR, QBK)
+PTH = (QVH, VHX)
+RQF = (KLR, KLR)
+MSL = (MVR, QQB)
+NRJ = (PGM, JJT)
+JLL = (KQJ, KQJ)
+DCL = (BPS, SSN)
+GTS = (MNT, PDJ)
+BXR = (NMX, BJX)
+CBL = (PND, GNP)
+VXK = (JJQ, JTK)
+BSL = (RHP, KSB)
+NJL = (SJG, CGS)
+DQQ = (XHX, VVX)
+SQQ = (BHK, KSX)
+KTX = (BVK, HLN)
+QCK = (XSL, MMP)
+SVC = (GSC, XKH)
+BGV = (MXH, MRH)
+GMG = (QRM, FMC)
+KGJ = (NLT, GGB)
+LRF = (QLR, CKB)
+CMN = (RCX, MQC)
+CGD = (JGM, PFR)
+LCD = (JSJ, KSS)
+HDG = (BPP, KNK)
+DDS = (LRP, RGT)
+LRM = (DQQ, JDR)
+CMH = (CBC, JFJ)
+GQH = (TDT, JGS)
+BKG = (RTL, XLC)
+RMR = (VRN, RDP)
+MGK = (XVD, HJH)
+FJS = (VTT, VPQ)
+SFH = (CTQ, QCL)
+XHN = (XQL, XMM)
+BPA = (CRJ, FJF)
+XCF = (VGL, LGR)
+TBM = (MSL, DKF)
+JLR = (LST, QTN)
+QFJ = (HVQ, QCJ)
+CCQ = (MNT, PDJ)
+VGN = (PXB, BHN)
+LTB = (QLV, NRT)
+DCH = (MXT, FQC)
+CFG = (PTH, GSL)
+JRF = (KXF, KXF)
+QRM = (CPV, GBC)
+XTX = (BTL, GQS)
+FHX = (SBD, RJF)
+FHF = (KSR, XFF)
+CSM = (NSL, XQG)
+HCP = (MMT, KLS)
+DJK = (XDT, XLJ)
+QLC = (CVF, RQG)
+MLJ = (HQT, DCL)
+CLM = (JCC, FJS)
+NQC = (HXV, FVH)
+RDD = (DTB, VGR)
+RPN = (DQC, DHG)
+GSL = (QVH, VHX)
+FGG = (NMX, BJX)
+BPJ = (RPJ, HBT)
+RBG = (NJB, JVV)
+FJF = (SGC, RNH)
+GGD = (CFB, NMC)
+QQG = (HLN, BVK)
+MVF = (RLP, RSF)
+JGM = (MHS, FRT)
+RMB = (JRF, LMH)
+VDM = (HFL, NRP)
+HNG = (NJB, JVV)
+MJV = (CJN, NRJ)
+DNN = (PQX, TRS)
+JDR = (XHX, VVX)
+KGF = (HDB, VPL)
diff --git a/2023/day8.test b/2023/day8.test
new file mode 100644
index 0000000..5b3fa58
--- /dev/null
+++ b/2023/day8.test
@@ -0,0 +1,10 @@
+LR
+
+11A = (11B, XXX)
+11B = (XXX, 11Z)
+11Z = (11B, XXX)
+22A = (22B, XXX)
+22B = (22C, 22C)
+22C = (22Z, 22Z)
+22Z = (22B, 22B)
+XXX = (XXX, XXX)
diff --git a/2023/day9.input b/2023/day9.input
new file mode 100644
index 0000000..65fb280
--- /dev/null
+++ b/2023/day9.input
@@ -0,0 +1,200 @@
+8 10 9 -2 -17 8 190 771 2208 5345 11753 24409 49063 97014 190779 375658 743112 1477240 2945141 5868120 11637263
+-9 -16 -26 -42 -67 -89 -41 278 1345 4163 10710 24787 53710 111805 227699 459451 925644 1868703 3782952 7672020 15562542
+28 51 96 170 284 469 798 1415 2573 4692 8485 15300 28049 53554 108059 229471 503402 1116673 2463878 5353430 11394522
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+8 24 56 121 238 431 742 1256 2137 3671 6309 10700 17701 28348 43769 65017 92798 127066 166454 207507 243680
+3 13 33 61 105 197 418 951 2204 5084 11556 25688 55464 115742 232843 451380 844073 1525447 2670475 4539407 7510219
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+5 12 36 95 219 453 862 1541 2644 4472 7720 14109 27863 58876 128976 283411 610443 1272472 2551916 4913291 9078231
+2 19 48 88 142 226 378 659 1139 1866 2825 3907 4925 5735 6545 8524 14856 32421 74326 163554 338048
+3 2 -4 -12 -13 15 119 394 1027 2386 5231 11268 24599 55319 127898 299662 699808 1609223 3620339 7952681 17068804
+9 19 41 88 184 362 655 1088 1698 2633 4409 8432 17912 39299 84354 172945 336675 623603 1104781 1884372 3117140
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+-1 -2 -8 -29 -74 -137 -160 57 1057 4150 12265 31578 74476 164761 346652 700523 1371301 2621840 4937055 9232612 17279510
+7 3 -1 -5 -9 -13 -17 -21 -25 -29 -33 -37 -41 -45 -49 -53 -57 -61 -65 -69 -73
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+7 28 76 166 310 512 772 1122 1725 3072 6312 13746 29508 60444 117184 215382 377075 632084 1019348 1588046 2398322
+-3 10 34 68 126 257 565 1229 2528 4882 8928 15661 26685 44639 73889 121610 199423 325802 529526 854522 1366528
+6 4 15 51 125 266 551 1157 2441 5079 10347 20719 41097 81174 159640 311114 596708 1118810 2039715 3601703 6142457
+12 35 71 120 182 257 345 446 560 687 827 980 1146 1325 1517 1722 1940 2171 2415 2672 2942
+-2 4 33 113 285 614 1209 2261 4127 7519 13909 26350 51070 100480 198753 392053 767092 1484370 2836777 5350987 9959291
+-6 -2 3 9 20 44 93 183 334 570 919 1413 2088 2984 4145 5619 7458 9718 12459 15745 19644
+12 25 49 95 174 290 437 612 857 1353 2630 6055 14955 37103 90000 211717 482514 1066813 2292543 4797075 9788236
+-4 4 16 26 29 26 31 88 318 1047 3127 8672 22628 55944 131699 296469 640572 1332626 2675974 5196610 9773547
+14 20 26 42 100 265 654 1485 3185 6596 13338 26437 51445 98542 186642 351540 662034 1251569 2380155 4556366 8781478
+17 28 52 116 263 555 1079 1958 3381 5702 9728 17440 33609 69151 147721 318136 676961 1408280 2851676 5615220 10758379
+27 38 47 50 36 -21 -161 -409 -683 -567 1192 7716 25976 70370 168856 372991 773719 1525352 2880909 5242830 9234076
+9 24 52 89 130 174 242 430 1026 2727 7008 16735 37199 77905 155712 300326 563743 1036074 1871316 3328125 5832568
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+23 37 62 108 193 352 660 1280 2553 5166 10476 21162 42594 85792 173866 355862 735855 1532471 3197482 6646280 13695427
+-7 -9 1 33 93 192 372 760 1668 3760 8302 17494 34850 65539 116523 196223 313307 474021 677271 906407 1116355
+4 13 35 70 118 179 253 340 440 553 679 818 970 1135 1313 1504 1708 1925 2155 2398 2654
+13 32 68 135 266 535 1087 2173 4187 7702 13502 22607 36288 56069 83713 121189 170617 234188 314056 412199 530246
+15 39 72 119 196 333 580 1029 1874 3542 6945 13932 28069 55954 109395 208956 389625 709697 1264414 2206485 3776346
+23 48 100 198 372 668 1150 1905 3070 4928 8170 14508 27993 57733 123378 265976 568880 1196482 2462432 4942379 9645683
+22 37 58 84 123 216 478 1175 2866 6656 14639 30679 61822 120915 231510 436964 817030 1517731 2805360 5166426 9499429
+9 38 78 125 175 224 268 303 325 330 314 273 203 100 -40 -221 -447 -722 -1050 -1435 -1881
+10 28 69 152 306 570 993 1634 2562 3856 5605 7908 10874 14622 19281 24990 31898 40164 49957 61456 74850
+10 30 66 140 289 566 1040 1795 2928 4546 6762 9690 13439 18106 23768 30473 38230 46998 56674 67080 77949
+10 33 71 120 172 215 233 206 110 -83 -405 -892 -1584 -2525 -3763 -5350 -7342 -9799 -12785 -16368 -20620
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+10 22 42 75 127 213 369 668 1240 2296 4156 7281 12309 20095 31755 48714 72758 106090 151390 211879 291387
+-4 -11 -10 7 44 101 174 255 332 389 406 359 220 -43 -466 -1089 -1956 -3115 -4618 -6521 -8884
+6 13 27 55 126 305 707 1511 2974 5445 9379 15351 24070 36393 53339 76103 106070 144829 194187 256183 333102
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diff --git a/2023/src/bin/day1.rs b/2023/src/bin/day1.rs
new file mode 100644
index 0000000..89958c6
--- /dev/null
+++ b/2023/src/bin/day1.rs
@@ -0,0 +1,60 @@
+use std::io;
+use std::collections::HashMap;
+use std::str::FromStr;
+use regex::Regex;
+
+fn main()  {
+    let mut sum = 0u32;
+    let mut sum2: u32 = 0;
+
+    let digit_names: HashMap<&str, u32> = HashMap::from([
+        ("one", 1),
+        ("two", 2),
+        ("three", 3),
+        ("four", 4),
+        ("five", 5),
+        ("six", 6),
+        ("seven", 7),
+        ("eight", 8),
+        ("nine", 9)
+    ]);
+
+    let regex_string = digit_names.keys()
+    .fold("\\d".to_owned(), |a,b| a + "|" + b);
+        println!("Regex: {regex_string}");
+        let regex = Regex::from_str(&regex_string).expect("Invalid regex");
+
+    let get_digit = |m: regex::Match<'_>| {
+        let digit = m.as_str();
+        digit.parse::<u32>()
+            .map_or(None, |x| Some(x))
+            .or(digit_names.get(digit).copied())
+            .expect("Regex doesn’t work")
+    };
+
+    for line in  io::stdin().lines() {
+        let line = line.unwrap();
+        let line = line.trim();
+
+        let digits: Vec<_> = line.chars()
+        .flat_map(|digit| digit.to_digit(10))
+        .collect();
+
+        if let (Some(first), Some(last)) = (digits.first(), digits.last()) {
+            sum += first * 10 + last
+        }
+
+        let match1 = regex.find(line)
+            .map(get_digit);
+        let match2 = (0..line.len()).rev().filter_map(|pos| regex.find_at(line, pos)).next()
+            .map(get_digit);
+
+        if let (Some(first), Some(last)) = (match1, match2) {
+            sum2 += first * 10 + last
+        }
+
+    } 
+
+    println!("Part 1: {sum}");
+    println!("Part 2: {sum2}");
+}
diff --git a/2023/src/bin/day10.rs b/2023/src/bin/day10.rs
new file mode 100644
index 0000000..fcfde8c
--- /dev/null
+++ b/2023/src/bin/day10.rs
@@ -0,0 +1,100 @@
+use aoc::grid::{Grid, GridVec};
+use std::iter::Iterator;
+
+trait MoreGrid: Grid { 
+
+    fn trace(&self, start: (usize, usize), start_direction: Direction) -> Option<usize> {
+        let mut position = start;
+        let mut direction = start_direction;
+        let mut count: usize = 0;
+        while let Some(new_position) = self.next_position(position, direction) {
+            count += 1;
+            let (x, y) = new_position;
+            position = new_position;
+            if start == position {
+                return Some(count);
+            }
+
+            if let Some(dir) = next_direction(direction.opposite(), self.char_at(x, y)) {
+                direction = dir;
+            } else {
+                return None
+            }
+        }
+        None
+    }
+
+    fn longest_loop(&self) -> Option<usize> {
+        if let Some(start) = self.find('S') {
+            vec![Direction::Top, Direction::Right, Direction::Bottom, Direction::Left]
+                .iter()
+                .filter_map(|dir| self.trace(start, *dir))
+                .max()
+        } else {
+            None
+        }
+    }
+
+    fn next_position(&self, current: (usize, usize), direction: Direction) -> Option<(usize, usize)> {
+        let (x, y) = current;
+        match direction {
+            Direction::Left => if x > 0 { Some((x - 1, y)) } else { None },
+            Direction::Right => if x + 1 < self.width() { Some((x + 1, y))} else { None },
+            Direction::Top => if y > 0 { Some((x, y - 1)) } else { None },
+            Direction::Bottom => if y + 1 < self.height() { Some((x, y + 1)) } else { None }
+        }
+    }
+
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+enum Direction {
+    Top,
+    Left,
+    Right,
+    Bottom
+}
+
+fn connections(ch: char) -> Option<(Direction, Direction)> {
+    match  ch {
+        '|' => Some((Direction::Top, Direction::Bottom)),
+        '-' => Some((Direction::Left, Direction::Right)),
+        'L' => Some((Direction::Top, Direction::Right)),
+        'J' => Some((Direction::Left, Direction::Top)),
+        '7' => Some((Direction::Left, Direction::Bottom)),
+        'F' => Some((Direction::Bottom, Direction::Right)),
+        '.' => None,
+        _ => panic!("Invalid direction")
+    }
+}
+
+fn next_direction(from: Direction, ch: char) -> Option<Direction> {
+    if let Some(pair) = connections(ch) {
+        match pair {
+            (f, result) if f == from => Some(result),
+            (result, f) if f == from => Some(result),
+            _ => None
+        }
+    } else {
+        None
+    }
+}
+
+impl Direction {
+    fn opposite(self) -> Direction {
+        match self {
+            Self::Top => Self::Bottom,
+            Self::Bottom => Self::Top,
+            Self::Left => Self::Right,
+            Self::Right => Self::Left
+        }
+    }
+}
+
+impl <T: Grid> MoreGrid for T {}
+
+fn main() {
+    let grid = GridVec::read();    
+
+    println!("Part 1: {}", grid.longest_loop().expect("No solution") / 2);
+}
diff --git a/2023/src/bin/day11.rs b/2023/src/bin/day11.rs
new file mode 100644
index 0000000..6fcf793
--- /dev/null
+++ b/2023/src/bin/day11.rs
@@ -0,0 +1,64 @@
+use aoc::grid::{Grid, GridVec};
+use itertools::Itertools;
+
+
+
+fn find_galaxies(grid: &GridVec, empty_columns: &Vec<usize>, empty_rows: &Vec<usize>, expansion_factor: usize) -> Vec<(usize, usize)> {
+    let mut offset_y: usize = 0;
+    let mut empty_rows = empty_rows.iter();
+    let mut next_empty_row = empty_rows.next();
+    let mut galaxies: Vec<(usize, usize)> = Vec::new();
+    for y in 0..grid.height() {
+        if Some(&y) == next_empty_row {
+            offset_y += expansion_factor;
+            next_empty_row = empty_rows.next();
+        }
+
+        let mut offset_x: usize = 0;
+        let mut empty_columns = empty_columns.iter();
+        let mut next_empty_column = empty_columns.next();
+        for x in 0..grid.width() {
+            if Some(&x) == next_empty_column {
+                offset_x += expansion_factor;
+                next_empty_column = empty_columns.next();
+            }
+
+            if grid.char_at(x, y) == '#' {
+                galaxies.insert(galaxies.len(), (x + offset_x, y + offset_y));
+            }
+        }
+    }
+
+    galaxies
+}
+
+
+fn sum_galaxy_distances(galaxies: &Vec<(usize, usize)>) -> usize {
+    let mut sum: usize = 0;
+    for i in 0..galaxies.len() {
+        for j in 0..i {
+            let (ax, ay) = galaxies[i];
+            let (bx, by) = galaxies[j];
+            
+            sum += if ax < bx { bx - ax } else { ax - bx };
+            sum += if ay < by { by - ay } else { ay - by };
+        }
+    }
+
+    sum
+}
+
+fn main() {
+    let grid = GridVec::read();    
+
+    let empty_columns: Vec<_> = (0..grid.width()).filter(|x| grid.column(*x).all(|ch| ch == '.')).collect();
+    let empty_rows: Vec<_> = (0..grid.height()).filter(|y| grid.row(*y).all(|ch| ch == '.')).collect();
+
+    let galaxies = find_galaxies(&grid, &empty_columns, &empty_rows, 1);
+    let part1 = sum_galaxy_distances(&galaxies);
+    println!("Part 1: {part1}");
+
+    let galaxies = find_galaxies(&grid, &empty_columns, &empty_rows, 1000000 - 1);
+    let part2 = sum_galaxy_distances(&galaxies);
+    println!("Part 2: {part2}");
+}
diff --git a/2023/src/bin/day12.rs b/2023/src/bin/day12.rs
new file mode 100644
index 0000000..66ceaad
--- /dev/null
+++ b/2023/src/bin/day12.rs
@@ -0,0 +1,57 @@
+use std::iter::zip;
+use aoc::{parsing, read_input};
+use nom::{character::complete::{space1, newline}, Parser, bytes::complete::{take_while1, tag}, sequence::{tuple, terminated}, multi::{separated_list0, many0}};
+use aoc::parsing::number;
+
+fn matches(string: &str, groups: &Vec<usize>) -> bool {
+    let parts = string.split('.')
+        .filter(|s| !s.is_empty())
+        .map(|s| s.chars().filter(|ch| *ch == '#').count());
+
+    let group_iter = groups.iter();
+
+    let all_equal = zip(parts.clone(), group_iter).all(|(a, b)| a == *b);
+    parts.count() == groups.len() && all_equal
+}
+
+fn combinations(string: &str, groups: &Vec<usize>) -> usize {
+    if let Some(index) = string.find('?') {
+        let first = &string[..index];
+        let rest = &string[(index + 1)..];
+
+        let mut a = first.to_owned();
+        a.push('.');
+        a.push_str(rest);
+
+        let mut b = first.to_owned();
+        b.push('#');
+        b.push_str(rest);
+
+        combinations(&a, groups) + combinations(&b, groups)
+    } else if matches(string, groups) {
+        1
+    } else {
+        0
+    }
+}
+
+fn springs<'a>(input: &'a str) -> parsing::Result<'a, &'a str> {
+    take_while1(|ch| ch == '#' || ch == '.' || ch == '?').parse(input)
+}
+
+fn line<'a>(input: &'a str) -> parsing::Result<'a, (&'a str, Vec<usize>)> {
+    tuple((
+        terminated(springs, space1),
+        separated_list0(tag(","), number)
+    )).parse(input)
+}
+
+fn main() {
+    let input = read_input();
+    let (_, input) = separated_list0(newline, line).parse(&input).expect("Cannot parse input");
+    let mut sum: usize = 0;
+    for (str, groups) in input {
+        sum += combinations(&str, &groups);
+    }
+    println!("Part 1: {sum}");
+}
diff --git a/2023/src/bin/day13.rs b/2023/src/bin/day13.rs
new file mode 100644
index 0000000..14ae8e0
--- /dev/null
+++ b/2023/src/bin/day13.rs
@@ -0,0 +1,41 @@
+use std::{io::stdin, cmp::min};
+
+use aoc::grid::{Grid, GridVec};
+
+fn main() {
+    let mut input = stdin().lines().map(|x| x.expect("Cannot read line"));
+    let mut sum: usize = 0;
+
+    while let Some(grid) = GridVec::read_one(&mut input) {
+
+        'outer: for i in 1..grid.width() {
+            let left = i;
+            let right = grid.width() - i;
+            let compare = min(left, right);
+
+            for k in 1..=compare {
+                if !grid.column(i - k).zip(grid.column(i + k - 1)).all(|(a,b)| a == b) {
+                    continue 'outer;
+                }
+            }
+
+            sum += i;
+        }
+
+        'outer: for i in 1..grid.height() {
+            let top = i;
+            let bottom = grid.height() - i;
+            let compare = min(top, bottom);
+
+            for k in 1..=compare {
+                if !grid.row(i - k).zip(grid.row(i + k - 1)).all(|(a,b)| a == b) {
+                    continue 'outer;
+                }
+            }
+
+            sum += 100 * i;
+        }
+    }
+
+    println!("Part 1: {sum}");
+}
diff --git a/2023/src/bin/day14.rs b/2023/src/bin/day14.rs
new file mode 100644
index 0000000..ff38fdb
--- /dev/null
+++ b/2023/src/bin/day14.rs
@@ -0,0 +1,45 @@
+use aoc::grid::{GridVec, Grid};
+
+fn main() {
+    let mut grid = GridVec::read();
+    for y in 0..grid.height() {
+        for x in 0..grid.width() {
+            if grid.char_at(x, y) != 'O' {
+                continue;
+            }
+
+            if let Some(open_y) = find_open_spot(&grid, x, y) {
+                grid.set_char_at(x, open_y, 'O');
+                grid.set_char_at(x, y, '.');
+            }
+        }
+    }
+
+    grid.print();
+
+    let mut sum = 0;
+    for y in 0..grid.height() {
+        let rocks = grid.line_at(y).chars().filter(|ch| *ch == 'O').count();
+        let weight = grid.height() - y;
+        sum += weight * rocks;
+    }
+
+    println!("Part 1: {sum}");
+}
+
+fn find_open_spot(grid: &GridVec, x: usize, y: usize) -> Option<usize> {
+    if y == 0 {
+        return None;
+    }
+
+    let mut new_y = y;
+    while new_y > 0 && grid.char_at(x, new_y - 1) == '.' {
+        new_y -= 1;
+    }
+
+    if new_y != y {
+        Some(new_y)
+    } else {
+        None
+    }
+}
\ No newline at end of file
diff --git a/2023/src/bin/day15.rs b/2023/src/bin/day15.rs
new file mode 100644
index 0000000..972cd6e
--- /dev/null
+++ b/2023/src/bin/day15.rs
@@ -0,0 +1,67 @@
+use std::collections::HashMap;
+
+use aoc::read_input;
+use itertools::Itertools;
+use linked_hash_map::LinkedHashMap;
+
+fn hash_hash(string: &str) -> usize {
+    let mut current = 0;
+    for ch in string.bytes() {
+        current += ch as usize;
+        current *= 17;
+        current = current % 256;
+    }
+
+    current
+}
+
+struct LensBox<'a> {
+    content: LinkedHashMap<&'a str, usize>
+}
+
+impl <'a> LensBox<'a> {
+    fn new() -> LensBox<'a> {
+        LensBox { 
+            content: LinkedHashMap::new()
+        }
+    }
+
+    fn remove(&mut self, label: &str) {
+        self.content.remove(label);
+    }
+
+    fn add(&mut self, label: &'a str, power: usize) {
+        *self.content.entry(label).or_insert(power) = power;
+    }
+
+    fn focus_power(&self, box_index: usize) -> usize {
+        self.content.iter().enumerate().fold(0, |a, (lens_index, (_, focus))| a + (box_index + 1) * (lens_index + 1) * *focus)
+    }
+}
+
+fn main() {
+    let input = read_input();
+    let input = input.split(',').collect_vec();
+    let result = input.iter().map(|str| hash_hash(str)).fold(0, |a,b| a+ b);
+    println!("Part 1: {result}");
+
+    let mut boxes = HashMap::new();
+    for instruction in input.iter() {
+        let index = instruction.find(|ch| ch == '=' || ch == '-').expect("Invalid instruction");
+        let label = &instruction[..index];
+        let box_index = hash_hash(label);
+        let lens_box = boxes.entry(box_index).or_insert_with(|| LensBox::new());
+        if  &instruction[index..=index] == "-" {
+            lens_box.remove(label)
+        } else {
+            let power = instruction[(index + 1)..].parse().expect("Invalid instruction");            
+            lens_box.add(label, power)
+        }
+    }
+
+    let part2 = (0..=256)
+        .filter_map(|n| Some(boxes.get(&n)?.focus_power(n)) )
+        .fold(0, |a, b| a + b);
+
+    println!("Part 2: {part2}");
+}
\ No newline at end of file
diff --git a/2023/src/bin/day16.rs b/2023/src/bin/day16.rs
new file mode 100644
index 0000000..e11a1bc
--- /dev/null
+++ b/2023/src/bin/day16.rs
@@ -0,0 +1,96 @@
+use std::{collections::{HashMap, HashSet}, cmp::max};
+
+use aoc::grid::{GridVec, Grid};
+use array2d::Array2D;
+
+fn grid_position(grid: &GridVec, x: isize, y: isize) -> Option<(usize, usize)> {
+    if x < 0 || y < 0 {
+        return None;
+    }
+
+    let cur_x: usize = x.try_into().unwrap();
+    let cur_y: usize = y.try_into().unwrap();
+
+    if cur_x >= grid.width() || cur_y >= grid.height() {
+        return None;
+    }
+
+    return Some((cur_x, cur_y));
+}
+
+fn trace(grid: &GridVec, energized: &mut Array2D<bool>, cache: &mut HashMap<(isize, isize, isize, isize), ()>, mut x: isize, mut y: isize, mut dx: isize, mut dy: isize) {
+
+    let key = (x, y, dx, dy);
+    if let Some(cached) = cache.get(&key) {
+        println!("Cached result found for {:?}", key);
+        return *cached;
+    }
+    
+    cache.insert(key, ());
+
+    let mut steps = HashSet::new();
+
+    while let Some((cur_x, cur_y)) = grid_position(grid, x, y) {
+        energized[(cur_y, cur_x)] = true;
+        let cur_ch = grid.char_at(cur_x, cur_y);
+        // println!("{x},{y} ({dx},{dy}) {cur_ch} ");
+
+        match cur_ch {
+            '/' => (dx, dy) = (-dy, -dx),
+            '\\' =>  (dx, dy) = (dy, dx),
+            '|' if dy == 0 => {
+                trace(grid, energized, cache, x, y - 1, 0, -1);
+                (dx, dy) = (0, 1);
+            }
+            '-' if dx == 0 => {
+                trace(grid, energized, cache, x - 1, y, -1, 0);
+                (dx, dy) = (1, 0);
+            },
+            '-' | '|' | '.' => {},
+            _ => panic!("Unknown character")
+        };
+
+        assert!(dx == 0 || dy == 0);
+
+        x += dx;
+        y += dy;
+
+        if !steps.insert((x, y, dx, dy)) {
+            println!("Loop detected, stopping");
+            break;
+        }
+    }
+
+}
+
+fn energized(grid: &GridVec, x: isize, y: isize, dx: isize, dy: isize) -> usize {
+    let mut energized = Array2D::filled_with(false, grid.height(), grid.width());
+    let mut cache = HashMap::new();
+    trace(&grid, &mut energized, &mut cache, x, y, dx, dy);
+    energized.elements_row_major_iter().filter(|energized| **energized).count()
+}
+
+fn main() {
+    let grid = GridVec::read();
+    let part1 = energized(&grid, 0, 0, 1, 0);
+    println!("Part 1: {part1}");
+
+    let mut part2 = 0;
+
+    let x_max: isize = grid.width().try_into().unwrap();
+    let y_max: isize = grid.height().try_into().unwrap();
+
+    for y in 0..y_max {
+        let a = energized(&grid, 0, y, 1, 0);
+        let b = energized(&grid, x_max - 1, y, -1, 0);
+        part2 = max(part2, max(a, b));
+    }
+
+    for x in 0..x_max {
+        let a = energized(&grid, x, 0, 0, 1);
+        let b = energized(&grid, x, y_max - 1, 0, -1);
+        part2 = max(part2, max(a, b));
+    }
+
+    println!("Part 2: {part2}");
+}
diff --git a/2023/src/bin/day17.rs b/2023/src/bin/day17.rs
new file mode 100644
index 0000000..2a778e4
--- /dev/null
+++ b/2023/src/bin/day17.rs
@@ -0,0 +1,3 @@
+fn main() {
+
+}
diff --git a/2023/src/bin/day2.rs b/2023/src/bin/day2.rs
new file mode 100644
index 0000000..d8e34ef
--- /dev/null
+++ b/2023/src/bin/day2.rs
@@ -0,0 +1,163 @@
+
+use std::{io, cmp::max};
+use std::io::Read;
+
+use nom::{
+    branch::alt, 
+    bytes::complete::tag, 
+    IResult, 
+    Parser, 
+    multi::separated_list0, 
+    sequence::{separated_pair, tuple}, 
+    combinator::map_res, 
+    character::{streaming::digit1, complete::line_ending}, 
+};
+
+#[derive(Debug)]
+struct Reveal {
+    red: usize, 
+    green: usize, 
+    blue: usize
+}
+
+#[derive(Debug)]
+struct Game {
+    id: usize,
+    reveals: Vec<Reveal>
+}
+
+impl Game {
+    fn new(id: usize, reveals: Vec<Reveal>) -> Game {
+        Game { id, reveals }
+    }
+
+    fn is_valid(&self) -> bool {
+        self.reveals.iter().all(|reveal| reveal.is_valid())
+    }
+
+    fn min_cubes(&self) -> Reveal {
+        self.reveals.iter().fold(Reveal::new(), |acc, reveal| {
+            Reveal {
+                red: max(acc.red, reveal.red),
+                green: max(acc.green, reveal.green),
+                blue: max(acc.blue, reveal.blue)
+            }
+        })
+    }
+}
+
+impl Reveal {
+    fn new() -> Reveal {
+        Reveal { red: 0, green: 0, blue: 0 }
+    }
+
+    fn with_red(&self, red: usize) -> Reveal {
+        Reveal { red: self.red + red, green: self.green, blue: self.blue } 
+    }
+
+    fn with_green(&self, green: usize) -> Reveal {
+        Reveal { red: self.red, green: self.green + green, blue: self.blue }
+    }
+
+    fn with_blue(&self, blue: usize) -> Reveal {
+        Reveal { red: self.red, green: self.green, blue: self.blue + blue }
+    }
+
+    fn with(&self, color: Color, count: usize) -> Reveal {
+        match color {
+            Color::Red => self.with_red(count),
+            Color::Green => self.with_green(count),
+            Color::Blue => self.with_blue(count),
+        }
+    }
+
+    fn is_valid(&self) -> bool {
+        self.red <= 12 && self.green <= 13 && self.blue <= 14
+    }
+
+    fn power(&self) -> usize {
+        self.red * self.green * self.blue
+    }
+}
+
+#[derive(Clone, Copy)]
+enum Color {
+    Red,
+    Green,
+    Blue
+}
+
+impl From<&str> for Color {
+    fn from(value: &str) -> Self {
+        match  value {
+            "red" => Color::Red,
+            "blue" => Color::Blue,
+            "green" => Color::Green,
+            _ => panic!("Invalid color")
+        }
+    }
+}
+
+fn color(input: &str) -> IResult<&str, Color> {
+    Parser::into(alt((
+        tag("red"),
+        tag("green"),
+        tag("blue")
+    ))).parse(input)
+}
+
+fn number(input: &str) -> IResult<&str, usize> {
+    map_res(digit1, str::parse).parse(input)
+}
+
+fn color_count(input: &str) -> IResult<&str, (usize, Color)> {
+    separated_pair(
+        number,
+        tag(" "), 
+        color
+    ).parse(input)
+}
+
+fn reveal(input: &str) -> IResult<&str, Reveal> {
+    separated_list0(tag(", "), color_count)
+        .map(|list|  {
+            list.iter().fold(Reveal::new(), |acc, (count, color)| {
+                acc.with(*color, *count)
+            })
+        })
+        .parse(input)
+}
+
+fn reveals(input: &str) -> IResult<&str, Vec<Reveal>> {
+    separated_list0(tag("; "), reveal).parse(input)
+}
+
+fn game(input: &str) -> IResult<&str, Game> {
+    tuple((
+        tag("Game "),
+        number,
+        tag(": "),
+        reveals,
+    ))
+    .map(|(_, id, _, reveals)| Game::new(id, reveals))
+    .parse(input)
+}
+
+fn input_file(input: &str) -> IResult<&str, Vec<Game>> {
+    separated_list0(line_ending, game).parse(input)
+}
+
+
+fn main() {
+    let mut input = String::new();
+    io::stdin().read_to_string(&mut input).expect("Reading failed");
+
+    let (_, games) = input_file(input.as_str()).expect("Parsing failed");
+    
+
+    let part1 = games.iter().filter(|game| game.is_valid()).fold(0, |acc, game| acc + game.id);
+    println!("Part 1: {part1}");
+
+    let part2 = games.iter().fold(0, |acc, game| acc + game.min_cubes().power());
+    println!("Part 2: {part2}");
+}
diff --git a/2023/src/bin/day3.rs b/2023/src/bin/day3.rs
new file mode 100644
index 0000000..f809157
--- /dev/null
+++ b/2023/src/bin/day3.rs
@@ -0,0 +1,81 @@
+use std::{io, cmp::min};
+
+use regex::Regex;
+
+#[derive(Debug)]
+struct Grid {
+    lines: Vec<String>,
+    width: usize
+}
+
+impl Grid {
+    fn read() -> Grid {
+        let lines: Vec<String> = io::stdin().lines().map(|line| line.expect("Cannot read line")).collect();
+        let width = lines.first().map_or(0, |l| l.len());
+        let ok = lines.iter().skip(1).all(|line| line.len() == width);
+        if !ok {
+            panic!("Not all lines same length");
+        }
+
+        Grid { lines, width }
+    }
+
+    fn char_at(&self, x: usize, y: usize) -> char {
+        self.lines[y].chars().nth(x).expect("Invalid index")
+    }
+
+    fn height(&self) -> usize { self.lines.len() }
+
+    fn numbers<'a>(&'a self, line: usize) -> Vec<(usize, usize, usize)>  {
+        let regex: Regex = Regex::new("\\d+").unwrap();
+
+        regex.find_iter(&self.lines[line])
+            .map(|x| { 
+                let index = x.start();
+                let str = x.as_str();
+                let result = (index, index + str.len() - 1, str.parse::<usize>().expect("Must be numeric"));
+                result
+            })
+            .filter(move |(start, end, _)| self.has_adjacent_symbol(line, *start, *end))
+            .collect::<Vec<(usize, usize, usize)>>()
+    }
+
+    fn all_numbers<'a>(&'a self)-> impl Iterator<Item = usize> + 'a {
+        (0..self.height())
+            .flat_map(|l| self.numbers(l))
+            .map(|(_, _, num)| num)
+        
+    }
+
+    fn has_adjacent_symbol(&self, line: usize, start: usize, end: usize) -> bool {
+        if start > 0 && is_symbol(self.char_at(start - 1, line)) {
+            return true;
+        }
+
+        if end + 1 < self.width && is_symbol(self.char_at(end + 1, line)) {
+            return true;
+        }
+
+        let xmin = if start > 0 { start - 1 } else { start };
+        let xmax = min(end + 1, self.width - 1);
+        if line > 0 && self.lines[line - 1][xmin..=xmax].contains(is_symbol) {
+            return true;
+        }
+
+        if line + 1 < self.height() && self.lines[line + 1][xmin..=xmax].contains(is_symbol) {
+            return true;
+        }
+
+        false
+    }
+}
+
+fn is_symbol(ch: char) -> bool {
+    ch != '.' && !ch.is_numeric()
+}
+
+fn main() {
+    let grid = Grid::read();
+    let part1 = grid.all_numbers().fold(0, |a, b| a + b);
+    println!("Part 1: {part1}");
+}
\ No newline at end of file
diff --git a/2023/src/bin/day4.rs b/2023/src/bin/day4.rs
new file mode 100644
index 0000000..19d16f0
--- /dev/null
+++ b/2023/src/bin/day4.rs
@@ -0,0 +1,68 @@
+use std::collections::HashSet;
+
+#[derive(Debug)]
+struct Card {
+    number: usize,
+    winning: HashSet<usize>,
+    numbers: Vec<usize>
+}
+
+impl Card {
+    fn new(number: usize, winning: HashSet<usize>, numbers: Vec<usize>) -> Self { Self { number, winning, numbers } }
+
+    fn winning_numbers(&self) -> usize {
+        self.numbers.iter().filter(|x| self.winning.contains(x)).count()
+    }
+
+    fn score(&self) -> usize {
+        let winners = self.winning_numbers();
+        if winners > 0 {
+            2usize.pow((winners - 1).try_into().unwrap())
+        } else {
+            0
+        }
+    }
+}
+
+mod parser {
+    use std::collections::{HashSet, hash_map::RandomState};
+
+    use nom::{IResult, multi::{many0, separated_list0}, Parser, sequence::{tuple, preceded}, bytes::complete::tag, character::complete::{multispace0, digit1}, combinator::map_res};
+    use nom::character::complete::multispace1;
+
+    use crate::Card;
+
+    fn number(input: &str) -> IResult<&str, usize> {
+        map_res(digit1, str::parse)(input)
+    }
+
+    fn list(input: &str) -> IResult<&str, Vec<usize>> {
+        preceded(multispace0, separated_list0(multispace1, number)).parse(input)
+    }
+
+    fn card(input: &str) -> IResult<&str, Card> {
+        tuple((
+            tag("Card"),
+            preceded(multispace1, number),
+            tag(":"),
+            list
+                .map(|list| HashSet::<usize, RandomState>::from_iter(list.iter().map(|x| *x))),
+            preceded(multispace0, tag("|")),
+            list,
+            multispace0
+        )).map(|(_, card_index, _, winning, _, given, _)| Card::new(card_index, winning, given))
+        .parse(input)
+    }
+
+    pub fn input(input: &str) -> IResult<&str, Vec<Card>> {
+        many0(card).parse(input)
+    }
+}
+
+fn main() {
+    let data = aoc::read_input();
+    let cards = parser::input(&data).expect("Parsing failed").1;
+
+    let part1 = cards.into_iter().fold(0, |a, b| a + b.score());
+    println!("Part 1: {part1}");
+}
\ No newline at end of file
diff --git a/2023/src/bin/day5.rs b/2023/src/bin/day5.rs
new file mode 100644
index 0000000..0ad698c
--- /dev/null
+++ b/2023/src/bin/day5.rs
@@ -0,0 +1,100 @@
+use aoc::read_input;
+
+#[derive(Debug)]
+struct MapEntry {
+    destination: usize,
+    source: usize,
+    length: usize,
+}
+
+impl MapEntry {
+    fn map(&self, input: usize) -> Option<usize> {
+        if input < self.source || self.source + self.length <= input {
+            return None
+        }
+
+        return Some(self.destination + ( input - self.source))
+    }
+}
+
+#[derive(Debug)]
+struct Map {
+    entries: Vec<MapEntry>
+}
+
+impl Map {
+    fn map(&self, input: usize) -> usize {
+        self.entries.iter()
+            .find_map( |e| e.map(input))
+            .unwrap_or(input)
+    }
+}
+
+mod parser {
+    use aoc::parsing::number;
+    use nom::{IResult, sequence::{tuple, preceded, terminated}, character::complete::{newline, multispace1}, multi::{separated_list0, count}, error::Error, bytes::complete::tag};
+    use nom::Parser;
+
+    use crate::MapEntry;
+
+     fn map_entry(input: &str) -> IResult<&str, MapEntry> {
+        tuple((
+            number,
+            preceded(multispace1, number),
+            preceded(multispace1, number),
+        ))
+        .map(|(a, b, c)| MapEntry{destination: a, source: b, length: c})
+        .parse(input)
+    }
+
+     fn map(input: &str) -> IResult<&str, crate::Map> {
+        terminated(separated_list0(newline, map_entry),newlines)
+        .map(|x| crate::Map{entries: x})
+        .parse(input)
+    }
+
+     fn map_with_title(title: &str) -> impl Parser<&str, crate::Map, Error<&str>>{
+        preceded(tuple((tag(title), tag(":"), newline)), map)
+    }
+
+    fn newlines(input: &str) -> IResult<&str, ()> {
+        count(newline, 2).map(|_| ()).parse(input)
+    }
+
+    fn seeds(input: &str) -> IResult<&str, Vec<usize>> {
+        terminated(preceded(tag("seeds: "), separated_list0(multispace1, number)), newlines)
+        .parse(input)
+    }
+
+    pub fn input(input: &str) -> IResult<&str, (Vec<usize>, crate::Map, crate::Map, crate::Map, crate::Map, crate::Map, crate::Map, crate::Map)> {
+        tuple((
+            seeds,
+            map_with_title("seed-to-soil map"),
+            map_with_title("soil-to-fertilizer map"),
+            map_with_title("fertilizer-to-water map"),
+            map_with_title("water-to-light map"),
+            map_with_title("light-to-temperature map"),
+            map_with_title("temperature-to-humidity map"),
+            map_with_title("humidity-to-location map")
+        ))
+        .parse(input)
+    }
+}
+
+fn main() {
+    let data = read_input();
+    let (_, input) = parser::input(&data).expect("Stuff");
+    let (seeds, seed_soil, soil_fertilizer, fertilizer_water, water_light, light_temp, temp_humid, humid_location) = input;
+    let x = seeds.iter()
+        .map(|seed| seed_soil.map(*seed) )
+        .map(|soil| soil_fertilizer.map(soil) )
+        .map(|fert| fertilizer_water.map(fert) )
+        .map(|water| water_light.map(water) )
+        .map(|light| light_temp.map(light) )
+        .map(|temp| temp_humid.map(temp) )
+        .map(|humid| humid_location.map(humid) )
+        .min()
+        .expect("Need a solution");
+
+    println!("Part 1: {x}");
+}
\ No newline at end of file
diff --git a/2023/src/bin/day6.rs b/2023/src/bin/day6.rs
new file mode 100644
index 0000000..a8a3c87
--- /dev/null
+++ b/2023/src/bin/day6.rs
@@ -0,0 +1,36 @@
+struct Race {
+    time: usize,
+    distance: usize,
+}
+
+impl Race {
+    fn calculate_distance(&self, charge: usize) -> usize {
+        let speed = charge;
+        let move_time = self.time - charge;
+        move_time * speed
+    }
+
+    fn ways_to_win(&self) -> usize {
+        (1..self.time).filter(|charge| self.calculate_distance(*charge) > self.distance).count()
+    }
+}
+
+/*
+Time:        48     87     69     81
+Distance:   255   1288   1117   1623
+ */
+fn main() {
+    let input = vec![
+        Race { time: 48, distance:  255 },
+        Race { time: 87, distance: 1288 },
+        Race { time: 69, distance: 1117 },
+        Race { time: 81, distance: 1623 },
+    ];
+
+    let part1 = input.iter().map(Race::ways_to_win).fold(1, |a,b| a * b);
+    println!("Part 1: {part1}");
+
+    let input2 = Race { time: 48876981, distance: 255128811171623 };
+    println!("Part 2: {}", input2.ways_to_win());
+
+}
diff --git a/2023/src/bin/day7-2.rs b/2023/src/bin/day7-2.rs
new file mode 100644
index 0000000..9d523eb
--- /dev/null
+++ b/2023/src/bin/day7-2.rs
@@ -0,0 +1,172 @@
+use std::{error::Error, collections::HashMap, cmp::Ordering};
+
+#[derive(PartialEq, Eq, PartialOrd, Ord, Debug, Clone, Copy, Hash)]
+enum Label {
+    J,
+    Two,
+    Three,
+    Four,
+    Five,
+    Six,
+    Seven,
+    Eight,
+    Nine,
+    T,
+    Q,
+    K,
+    A
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd)]
+struct Hand {
+    cards: [Label; 5]
+}
+
+struct WrongCardCount;
+
+impl TryFrom<Vec<Label>> for Hand {
+    type Error = WrongCardCount;
+    fn try_from(value: Vec<Label>) -> Result<Self, Self::Error> {
+        let cards: [Label; 5] = value.try_into().map_err(|_| WrongCardCount)?;
+        Ok(Hand { cards })
+    }
+}
+
+mod parser {
+    use nom::{character::complete::{one_of, multispace1, newline}, Parser, combinator::{map_opt, map_res}, multi::{count, separated_list0}, sequence::{preceded, tuple}};
+    use aoc::parsing::number;
+    
+    fn label(input: &str) -> aoc::parsing::Result<crate::Label> {
+        map_opt(one_of("23456789TJQKA"), crate::Label::from_char).parse(input)
+    }
+    
+    fn hand(input: &str) -> aoc::parsing::Result<crate::Hand> {
+        map_res(count(label, 5), |vec| vec.try_into()).parse(input)        
+    }
+
+    fn line(input: &str) -> aoc::parsing::Result<(crate::Hand, usize)> {
+        tuple((
+            hand,
+            preceded(multispace1, number)
+        )).parse(input)
+    }
+
+    pub fn input(input: &str) -> aoc::parsing::Result<Vec<(crate::Hand, usize)>> {
+        separated_list0(newline, line).parse(input)
+    }
+}
+
+impl Label {
+    fn from_char(ch: char) -> Option<Label> {
+        Some(match ch {
+            '2' => Label::Two,
+            '3' => Label::Three,
+            '4' => Label::Four,
+            '5' => Label::Five,
+            '6' => Label::Six,
+            '7' => Label::Seven,
+            '8' => Label::Eight,
+            '9' => Label::Nine,
+            'T' => Label::T,
+            'J' => Label::J,
+            'Q' => Label::Q,
+            'K' => Label::K,
+            'A' => Label::A,
+            _ => return None
+        })
+    }
+}
+
+impl Hand {
+    fn counts(&self) -> (Vec<usize>, usize) {
+        let mut result: HashMap<Label, usize> = HashMap::new();
+        for card in self.cards {
+            *result.entry(card).or_insert(0) += 1;
+        }
+        let jokers = result.remove(&Label::J).unwrap_or(0);
+        
+        let mut values: Vec<usize> = result.values().map(|x| *x).collect();
+        values.sort_by(|a, b| b.cmp(a));
+        return (values, jokers);
+    }
+    
+    fn value(&self) -> Value {
+        let (counts, mut jokers) = self.counts();
+        let mut counts = counts.iter();
+
+        let first = counts.next().unwrap_or(&0);
+        if first + jokers >= 5 {
+            return Value::Five;
+        }
+
+        if first + jokers >= 4 {
+            return Value::Four;
+        }
+
+        if first + jokers >= 3 {
+            jokers -= 3 - first;
+            
+            let next = *counts.next().unwrap_or(&0);
+            if next + jokers >= 2 {
+                return Value::FullHouse;
+            }
+
+            return Value::Three;
+        }
+
+        if first + jokers >= 2 {
+            jokers -= 2 - first;
+
+            let next = *counts.next().unwrap_or(&0);
+            if next + jokers >= 2 {
+                return Value::TwoPair;
+            }
+
+            return Value::OnePair;
+        }
+
+        Value::HighCard
+    }
+}
+
+#[derive(PartialEq, Eq, PartialOrd, Ord, Debug)]
+enum Value {
+    HighCard,
+    OnePair,
+    TwoPair,
+    Three,
+    FullHouse,
+    Four,
+    Five,
+}
+
+impl Ord for Hand {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        let value = self.value().cmp(&other.value());
+        if value == Ordering::Equal {
+            self.cards.cmp(&other.cards)
+        } else {
+            value
+        }
+    }
+}
+
+fn main() {
+
+    let input = aoc::read_input();
+    let (_, mut result) = parser::input(&input).expect("Parse error");
+
+    result.sort_by(|a,b| a.0.cmp(&b.0));
+
+    for (rank, (hand, _)) in result.iter().enumerate() {
+        println!("{}: {:?} {:?}", rank + 1, hand, hand.value());
+    }
+
+    let part1 = result.iter()
+        .enumerate()
+        .map(|(rank, (_, value))| (rank + 1) * value)
+        .fold(0, |a, b| a + b);
+
+    println!("Part 1: {part1}");
+
+}
diff --git a/2023/src/bin/day7.rs b/2023/src/bin/day7.rs
new file mode 100644
index 0000000..6c6d06d
--- /dev/null
+++ b/2023/src/bin/day7.rs
@@ -0,0 +1,152 @@
+use std::{error::Error, collections::HashMap, cmp::Ordering};
+
+#[derive(PartialEq, Eq, PartialOrd, Ord, Debug, Clone, Copy, Hash)]
+enum Label {
+    Two,
+    Three,
+    Four,
+    Five,
+    Six,
+    Seven,
+    Eight,
+    Nine,
+    T,
+    J,
+    Q,
+    K,
+    A
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd)]
+struct Hand {
+    cards: [Label; 5]
+}
+
+struct WrongCardCount;
+
+impl TryFrom<Vec<Label>> for Hand {
+    type Error = WrongCardCount;
+    fn try_from(value: Vec<Label>) -> Result<Self, Self::Error> {
+        let cards: [Label; 5] = value.try_into().map_err(|_| WrongCardCount)?;
+        Ok(Hand { cards })
+    }
+}
+
+mod parser {
+    use nom::{character::complete::{one_of, multispace1, newline}, Parser, combinator::{map_opt, map_res}, multi::{count, separated_list0}, sequence::{preceded, tuple}};
+    use aoc::parsing::number;
+    
+    fn label(input: &str) -> aoc::parsing::Result<crate::Label> {
+        map_opt(one_of("23456789TJQKA"), crate::Label::from_char).parse(input)
+    }
+    
+    fn hand(input: &str) -> aoc::parsing::Result<crate::Hand> {
+        map_res(count(label, 5), |vec| vec.try_into()).parse(input)        
+    }
+
+    fn line(input: &str) -> aoc::parsing::Result<(crate::Hand, usize)> {
+        tuple((
+            hand,
+            preceded(multispace1, number)
+        )).parse(input)
+    }
+
+    pub fn input(input: &str) -> aoc::parsing::Result<Vec<(crate::Hand, usize)>> {
+        separated_list0(newline, line).parse(input)
+    }
+}
+
+impl Label {
+    fn from_char(ch: char) -> Option<Label> {
+        Some(match ch {
+            '2' => Label::Two,
+            '3' => Label::Three,
+            '4' => Label::Four,
+            '5' => Label::Five,
+            '6' => Label::Six,
+            '7' => Label::Seven,
+            '8' => Label::Eight,
+            '9' => Label::Nine,
+            'T' => Label::T,
+            'J' => Label::J,
+            'Q' => Label::Q,
+            'K' => Label::K,
+            'A' => Label::A,
+            _ => return None
+        })
+    }
+}
+
+impl Hand {
+    fn counts(&self) -> Vec<usize> {
+        let mut result: HashMap<Label, usize> = HashMap::new();
+        for card in self.cards {
+            *result.entry(card).or_insert(0) += 1;
+        }
+        let mut values: Vec<usize> = result.values().map(|x| *x).collect();
+        values.sort_by(|a, b| b.cmp(a));
+        return values;
+    }
+    
+    fn value(&self) -> Value {
+        let counts = self.counts();
+        let mut counts = counts.iter();
+
+        let first = counts.next().expect("Cannot be empty");
+        match first {
+            5 => Value::Five,
+            4 => Value::Four,
+            3 => {
+                let next = counts.next().expect("Cannot be empty");
+                if *next == 2 { Value::FullHouse } else { Value::Three }
+            }
+            2 => {
+                let next = counts.next().expect("Cannot be empty");
+                if *next == 2 { Value::TwoPair } else { Value::OnePair }
+            }
+            _ => Value::HighCard
+        }
+    }
+}
+
+#[derive(PartialEq, Eq, PartialOrd, Ord, Debug)]
+enum Value {
+    HighCard,
+    OnePair,
+    TwoPair,
+    Three,
+    FullHouse,
+    Four,
+    Five,
+}
+
+impl Ord for Hand {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        let value = self.value().cmp(&other.value());
+        if value == Ordering::Equal {
+            self.cards.cmp(&other.cards)
+        } else {
+            value
+        }
+    }
+}
+
+fn main() {
+
+    let input = aoc::read_input();
+    let (_, mut result) = parser::input(&input).expect("Parse error");
+
+    result.sort_by(|a,b| a.0.cmp(&b.0));
+
+    for (rank, (hand, _)) in result.iter().enumerate() {
+        println!("{}: {:?} {:?}", rank + 1, hand, hand.value());
+    }
+
+    let part1 = result.iter()
+        .enumerate()
+        .map(|(rank, (_, value))| (rank + 1) * value)
+        .fold(0, |a, b| a + b);
+
+    println!("Part 1: {part1}");
+
+}
diff --git a/2023/src/bin/day8.rs b/2023/src/bin/day8.rs
new file mode 100644
index 0000000..20a0c35
--- /dev/null
+++ b/2023/src/bin/day8.rs
@@ -0,0 +1,107 @@
+use std::collections::HashMap;
+
+mod parsing {
+use nom::{Parser, sequence::{tuple, terminated}, character::complete::{newline, one_of}, multi::{many_till, separated_list0}, combinator::{map}, bytes::complete::{take, tag}};
+use std::collections::HashMap;
+
+fn instructions(input: &str) -> aoc::parsing::Result<Vec<char>> {
+    map(many_till(one_of("LR"), newline), |(result,_)| result).parse(input)
+}
+
+fn node(input: &str) -> aoc::parsing::Result<&str> {
+    take(3usize).parse(input)
+}
+
+fn map_line(input: &str) -> aoc::parsing::Result<(&str, &str, &str)> {
+    tuple((
+        terminated(node, tag(" = (")),
+        terminated(node, tag(", ")),
+        terminated(node, tag(")"))
+    )).parse(input)
+}
+
+fn parse_map(input: &str) -> aoc::parsing::Result<HashMap<&str, (&str, &str)>> {
+    map(separated_list0(newline, map_line), |list| {
+        let mut result = HashMap::with_capacity(list.len());
+
+        for (node, left, right) in list {
+            result.insert(node, (left, right));
+        }
+
+        result
+    }).parse(input)
+}
+
+pub fn input(input: &str) -> aoc::parsing::Result<(Vec<char>, HashMap<&str, (&str, &str)>)> {
+    tuple((
+        terminated(instructions, newline),
+        parse_map
+    )).parse(input)
+}
+}
+
+type Map<'a> = HashMap<&'a str, (&'a str, &'a str)>;
+
+struct Camel<'a> {
+    position: &'a str,
+    map: &'a Map<'a>
+}
+
+impl Camel<'_> {
+    fn new<'a>(position: &'a str, map: &'a Map) -> Camel<'a> {
+        assert!(position.len() == 3);
+        Camel { position, map }
+    }
+
+    fn go(&mut self, direction: char) {
+        let (left, right) = self.map.get(self.position).expect(&format!("Position {} not in map", self.position));
+
+        self.position = match direction {
+            'L' => left,
+            'R' => right,
+            _ => panic!("Invalid direction {direction}")
+        }
+    }
+
+    fn at_goal(&self) -> bool {
+        self.position.chars().nth(2).unwrap() == 'Z'
+    }
+}
+
+fn main() {
+    let input = aoc::read_input();
+    let (_, (instructions, map)) = parsing::input(&input).expect("Failed to parse");
+
+    let mut iter = instructions.iter().cycle();
+
+    let mut camel = Camel::new("AAA", &map);
+    let mut steps = 0;
+    while camel.position != "ZZZ" {
+        camel.go(*iter.next().unwrap());
+        steps += 1;
+    }
+
+    println!("Part 1: {steps}");
+
+    let mut camels: Vec<_> = map.keys().filter_map(|key| if key.chars().last().unwrap() == 'A' {
+        Some(Camel::new(key, &map))
+    } else {
+        None
+    }).collect();
+
+    println!("{:?}", camels.iter().map(|x| x.position).collect::<Vec<_>>());
+
+    let mut iter = instructions.iter().cycle();
+
+    let mut steps = 0;
+    while !camels.iter().all(Camel::at_goal) {
+        let direction = *iter.next().unwrap();
+        for camel in camels.iter_mut() {
+            camel.go(direction);
+        }
+        steps += 1;
+    }
+
+    println!("Part 2: {steps}");
+
+}
\ No newline at end of file
diff --git a/2023/src/bin/day9.rs b/2023/src/bin/day9.rs
new file mode 100644
index 0000000..2b8a2ec
--- /dev/null
+++ b/2023/src/bin/day9.rs
@@ -0,0 +1,42 @@
+use aoc::read_input;
+use aoc::{parse_input, parsing::numbers};
+use nom::multi::many0;
+use nom::Parser;
+
+fn next_element(list: &Vec<isize>) -> isize 
+{
+    if list.iter().all(|x| *x == 0) {
+        0
+    } else {
+        let last = list.last().expect("Cannot use with empty list");
+        last + next_element(&differences(&list))
+    }
+}
+
+fn previous_element(list: &Vec<isize>) -> isize 
+{
+    if list.iter().all(|x| *x == 0) {
+        0
+    } else {
+        let first = list.first().expect("Cannot use with empty list");
+        first - previous_element(&differences(&list))
+    }
+}
+
+fn differences(list: &Vec<isize>) -> Vec<isize>
+{
+    use itertools::Itertools;
+    list.iter().tuple_windows().map(|(a, b)| b - a).collect()
+}
+
+fn main() {
+    let input = read_input();
+    let (_, lists) = many0(numbers).parse(&input).unwrap();
+
+
+    let part1 = lists.iter().fold(0, |a, b| a + next_element(b));
+    println!("Part 1: {part1}");
+
+    let part2 = lists.iter().fold(0, |a, b| a + previous_element(b));
+    println!("Part 2: {part2}");
+}
diff --git a/2023/src/grid.rs b/2023/src/grid.rs
new file mode 100644
index 0000000..1c9979c
--- /dev/null
+++ b/2023/src/grid.rs
@@ -0,0 +1,150 @@
+use std::{io, str::Chars, iter::FusedIterator};
+
+use itertools::Itertools;
+
+#[derive(Debug)]
+pub struct GridVec {
+    lines: Vec<String>,
+    width: usize,
+}
+
+pub struct Column<'a> {
+    grid: &'a GridVec,
+    x: usize,
+    y: usize
+}
+
+impl <'a> Column<'a> {
+    fn new(grid: &'a GridVec, x: usize) -> Column<'a> {
+        Column { grid, x, y: 0 }
+    }
+}
+
+impl <'a> Iterator for Column<'a> {
+    type Item = char;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.y < self.grid.height() {
+            let result = self.grid.char_at(self.x, self.y);
+            self.y += 1;
+            Some(result)
+        } else {
+            None
+        }
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        let len = self.len();
+        (len, Some(len))
+    }
+}
+
+impl ExactSizeIterator for Column<'_> {
+    fn len(&self) -> usize {
+        self.grid.height() - self.y
+    }
+}
+
+impl  FusedIterator for Column<'_> {}
+
+
+pub trait Grid where Self: Sized {
+    type ColumnIter<'a>: ExactSizeIterator<Item = char> + 'a where Self: 'a;
+    type RowIter<'a>: Iterator<Item = char> + 'a where Self: 'a;
+
+    fn new(lines: Vec<String>) -> Self;
+
+     fn read() -> Self {
+        let lines: Vec<String> = io::stdin().lines().map(|line| line.expect("Cannot read line")).collect();
+
+        Self::new(lines)
+    }
+
+    fn read_one<I>(input: &mut I) -> Option<Self>
+        where I: Iterator<Item = String>
+    {
+        let lines = input.take_while(|l| !l.is_empty()).collect_vec();
+        if lines.is_empty() {
+            None
+        } else {
+            Some(Self::new(lines))
+        }
+    }
+
+     fn char_at(&self, x: usize, y: usize) -> char {
+        self.line_at(y).chars().nth(x).expect("Invalid index")
+     }
+
+     fn set_char_at(&mut self, x: usize, y:  usize, ch: char);
+
+     fn height(&self) -> usize;
+     fn width(&self) -> usize;
+
+     fn line_at(&self, y: usize) -> &str;
+
+     fn find(&self, ch: char) -> Option<(usize, usize)> {
+        for y in 0..self.height() {
+            if let Some(pos) = self.line_at(y).find(ch) {
+                return Some((pos, y));
+            }
+        }
+
+
+
+        None
+    }
+
+    fn column<'a>(&'a self, x: usize) -> Self::ColumnIter<'a>;
+    fn row<'a>(&'a self, y: usize) -> Self::RowIter<'a>;
+}
+
+impl Grid for GridVec {
+
+    type ColumnIter<'a> = Column<'a>;
+    type RowIter<'a> =  Chars<'a>;
+
+    fn column<'a>(&'a self, x: usize) -> Self::ColumnIter<'a> {
+        Column::new(self, x)
+    }
+
+    fn row<'a>(&'a self, y: usize) -> Self::RowIter<'a> {
+        self.line_at(y).chars()
+    }
+
+    fn new(lines: Vec<String>) -> Self {
+        let width = lines.first().map_or(0, |l| l.len());
+        let ok = lines.iter().skip(1).all(|line| line.len() == width);
+        if !ok {
+            println!("Read lines: {:?}", lines);
+            panic!("Not all lines same length");
+        }
+
+        GridVec {lines, width }
+    }
+
+    fn char_at(&self, x: usize, y: usize) -> char {
+        self.lines[y].chars().nth(x).expect("Invalid index")
+    }
+
+    fn set_char_at(&mut self, x: usize, y:  usize, ch: char) {
+
+        let line = &mut self.lines[y];
+        line.replace_range(x..=x, &ch.to_string());
+     }
+
+     fn height(&self) -> usize { self.lines.len() }
+     fn width(&self) -> usize { self.width }
+
+     fn line_at(&self, y: usize) -> &str {
+        &self.lines[y]
+     }
+
+}
+
+impl GridVec {
+    pub fn print(&self) {
+        for line in self.lines.iter() {
+            println!("{line}");
+        }
+    }
+}
diff --git a/2023/src/lib.rs b/2023/src/lib.rs
new file mode 100644
index 0000000..4a0ff5f
--- /dev/null
+++ b/2023/src/lib.rs
@@ -0,0 +1,22 @@
+pub mod parsing;
+pub mod grid;
+
+use std::io::{self, Read};
+
+pub fn read_input() -> String
+{
+    let mut input = String::new();
+    io::stdin().read_to_string(&mut input).expect("Reading failed");
+
+    input
+}
+
+
+
+pub fn parse_input<T, P>(parser: P) -> T
+    where for<'a> P: parsing::Parser<'a, T>
+{
+    let mut parser = parser;
+    let input = read_input();
+    parser.result(&input).expect("Could not parse input")
+}
diff --git a/2023/src/parsing.rs b/2023/src/parsing.rs
new file mode 100644
index 0000000..5e6dbe2
--- /dev/null
+++ b/2023/src/parsing.rs
@@ -0,0 +1,23 @@
+use nom::{IResult, character::complete::{i64, u64, newline, space1}, combinator::map, error::Error, sequence::terminated, multi::separated_list0};
+
+pub fn number(input: &str) -> Result<usize> {
+    map(u64, |x| x as usize)(input)
+}
+
+pub fn signed_number(input: &str) -> Result<isize> {
+    map(i64, |x| x as isize)(input)
+}
+
+pub fn numbers(input: &str) -> Result<Vec<isize>> {
+    use nom::Parser;
+    terminated(separated_list0(space1, signed_number), newline).parse(input)
+}
+
+pub type Result<'a, T> = IResult<&'a str, T>;
+
+pub trait Parser<'a, T>: nom::Parser<&'a str, T, Error<&'a str>> {
+
+    fn result(&mut self, input: &'a str) -> std::result::Result<T, nom::Err<Error<&'a str>>> {
+        self.parse(input).map(|(_, result)| result)
+    }
+}