From bf01bd365d5ae4f953531d8d356f1e01dbd74639 Mon Sep 17 00:00:00 2001 From: Luciano Mammino Date: Fri, 8 Dec 2023 13:57:52 +0000 Subject: [PATCH] added y2023/ex08 --- Cargo.toml | 1 + y2023/ex08/Cargo.toml | 17 + y2023/ex08/README.md | 79 +++ y2023/ex08/benches/bench_y2023ex08.rs | 11 + y2023/ex08/input.txt | 788 ++++++++++++++++++++++++++ y2023/ex08/src/lib.rs | 95 ++++ y2023/ex08/src/models.rs | 106 ++++ 7 files changed, 1097 insertions(+) create mode 100644 y2023/ex08/Cargo.toml create mode 100644 y2023/ex08/README.md create mode 100644 y2023/ex08/benches/bench_y2023ex08.rs create mode 100644 y2023/ex08/input.txt create mode 100644 y2023/ex08/src/lib.rs create mode 100644 y2023/ex08/src/models.rs diff --git a/Cargo.toml b/Cargo.toml index a0343f6..0c6d580 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -74,6 +74,7 @@ members = [ "y2023/ex05", "y2023/ex06", "y2023/ex07", + "y2023/ex08", ] [profile.bench] diff --git a/y2023/ex08/Cargo.toml b/y2023/ex08/Cargo.toml new file mode 100644 index 0000000..78235ea --- /dev/null +++ b/y2023/ex08/Cargo.toml @@ -0,0 +1,17 @@ +[package] +name = "y2023ex08" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +nom = "7.1.3" +num = "0.4.1" + +[[bench]] +name = "bench_y2023ex08" +harness = false + +[dev-dependencies] +criterion = "0.5.1" diff --git a/y2023/ex08/README.md b/y2023/ex08/README.md new file mode 100644 index 0000000..5cd2313 --- /dev/null +++ b/y2023/ex08/README.md @@ -0,0 +1,79 @@ +# Day 8: Haunted Wasteland + +[Check it out on adventofcode.com](https://adventofcode.com/2023/day/8) + +## Part One + +You're still riding a camel across Desert Island when you spot a sandstorm quickly approaching. When you turn to warn the Elf, she disappears before your eyes! To be fair, she had just finished warning you about _ghosts_ a few minutes ago. + +One of the camel's pouches is labeled "maps" - sure enough, it's full of documents (your puzzle input) about how to navigate the desert. At least, you're pretty sure that's what they are; one of the documents contains a list of left/right instructions, and the rest of the documents seem to describe some kind of _network_ of labeled nodes. + +It seems like you're meant to use the _left/right_ instructions to _navigate the network_. Perhaps if you have the camel follow the same instructions, you can escape the haunted wasteland! + +After examining the maps for a bit, two nodes stick out: `AAA` and `ZZZ`. You feel like `AAA` is where you are now, and you have to follow the left/right instructions until you reach `ZZZ`. + +This format defines each _node_ of the network individually. For example: + + RL + + AAA = (BBB, CCC) + BBB = (DDD, EEE) + CCC = (ZZZ, GGG) + DDD = (DDD, DDD) + EEE = (EEE, EEE) + GGG = (GGG, GGG) + ZZZ = (ZZZ, ZZZ) + + +Starting with `AAA`, you need to _look up the next element_ based on the next left/right instruction in your input. In this example, start with `AAA` and go _right_ (`R`) by choosing the right element of `AAA`, `_CCC_`. Then, `L` means to choose the _left_ element of `CCC`, `_ZZZ_`. By following the left/right instructions, you reach `ZZZ` in `_2_` steps. + +Of course, you might not find `ZZZ` right away. If you run out of left/right instructions, repeat the whole sequence of instructions as necessary: `RL` really means `RLRLRLRLRLRLRLRL...` and so on. For example, here is a situation that takes `_6_` steps to reach `ZZZ`: + + LLR + + AAA = (BBB, BBB) + BBB = (AAA, ZZZ) + ZZZ = (ZZZ, ZZZ) + + +Starting at `AAA`, follow the left/right instructions. _How many steps are required to reach `ZZZ`?_ + +Your puzzle answer was `19631`. + +## Part Two + +The sandstorm is upon you and you aren't any closer to escaping the wasteland. You had the camel follow the instructions, but you've barely left your starting position. It's going to take _significantly more steps_ to escape! + +What if the map isn't for people - what if the map is for _ghosts_? Are ghosts even bound by the laws of spacetime? Only one way to find out. + +After examining the maps a bit longer, your attention is drawn to a curious fact: the number of nodes with names ending in `A` is equal to the number ending in `Z`! If you were a ghost, you'd probably just _start at every node that ends with `A`_ and follow all of the paths at the same time until they all simultaneously end up at nodes that end with `Z`. + +For example: + + 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) + + +Here, there are two starting nodes, `11A` and `22A` (because they both end with `A`). As you follow each left/right instruction, use that instruction to _simultaneously_ navigate away from both nodes you're currently on. Repeat this process until _all_ of the nodes you're currently on end with `Z`. (If only some of the nodes you're on end with `Z`, they act like any other node and you continue as normal.) In this example, you would proceed as follows: + +* Step 0: You are at `11A` and `22A`. +* Step 1: You choose all of the _left_ paths, leading you to `11B` and `22B`. +* Step 2: You choose all of the _right_ paths, leading you to `_11Z_` and `22C`. +* Step 3: You choose all of the _left_ paths, leading you to `11B` and `_22Z_`. +* Step 4: You choose all of the _right_ paths, leading you to `_11Z_` and `22B`. +* Step 5: You choose all of the _left_ paths, leading you to `11B` and `22C`. +* Step 6: You choose all of the _right_ paths, leading you to `_11Z_` and `_22Z_`. + +So, in this example, you end up entirely on nodes that end in `Z` after `_6_` steps. + +Simultaneously start on every node that ends with `A`. _How many steps does it take before you're only on nodes that end with `Z`?_ + +Your puzzle answer was `21003205388413` diff --git a/y2023/ex08/benches/bench_y2023ex08.rs b/y2023/ex08/benches/bench_y2023ex08.rs new file mode 100644 index 0000000..fc52535 --- /dev/null +++ b/y2023/ex08/benches/bench_y2023ex08.rs @@ -0,0 +1,11 @@ +use criterion::{black_box, criterion_group, criterion_main, Criterion}; +use y2023ex08::{part1, part2}; + +fn criterion_benchmark(c: &mut Criterion) { + let input = include_str!("../input.txt"); + c.bench_function("y2023ex08::part1", |b| b.iter(|| part1(black_box(input)))); + c.bench_function("y2023ex08::part2", |b| b.iter(|| part2(black_box(input)))); +} + +criterion_group!(benches, criterion_benchmark); +criterion_main!(benches); diff --git a/y2023/ex08/input.txt b/y2023/ex08/input.txt new file mode 100644 index 0000000..24f1690 --- /dev/null +++ b/y2023/ex08/input.txt @@ -0,0 +1,788 @@ +LRRLRRRLRLRLLRRLRLRLLRLRLRLLLLRRRLLRRRLRRRLRRRLLRLLRLRRLRLRLRRRLLLLRRLRLRRLRRLLRRRLRRLRLRRLRRLRRLRRLRLLRRLRRLLLLRLRLRRLLRRLLRRLRLLRLRRLRRLRRLRRRLRRLLLRRLRRRLRLRRRLLRLRRLRRRLRRLLRRRLRRLRLLRRLLRRLRRLRRRLRRLLRRLRRRLRLRLRLRLRLRRLRRLLRRRLRLRRLRRRLRLRLRLRLRLRRRLRRLRRRLLRRLRLLRRRLRRLRLLLLRRRLRRLRRRR + +DRM = (DLQ, BGR) +PKD = (TNC, DKH) +FSM = (LKS, KPG) +NDS = (KGD, HNX) +KQQ = (DPF, GKD) +SBX = (DDL, MGH) +GCV = (KMG, GLP) +PCT = (JXN, XDR) +KHR = (QPK, FPQ) +FCK = (GLS, GGP) +MKR = (XPQ, TJX) +PFP = (RPR, LPS) +XPC = (SSS, FRX) +PTJ = (LSC, CND) +GVJ = (NRL, SHV) +QNF = (MBQ, GSR) +TMK = (DVM, BJM) +KTG = (QVG, LLX) +JMK = (BKF, XDK) +JQV = (DCM, RLT) +VFH = (FDD, GML) +XPN = (FKG, CXG) +GDX = (GRV, BPP) +GVP = (JLP, XNJ) +TCB = (RVR, QXQ) +DLP = (XDK, BKF) +FQG = (RMH, QHR) +XDD = (SMK, HMN) +TLL = (TVV, FXX) +NPT = (NGC, FQM) +XQK = (PQG, QTK) +DMQ = (RVS, KNQ) +QKR = (SJD, PLH) +XNV = (SJB, GCV) +SRP = (CDK, JFK) +FRP = (FFD, XPC) +PVC = (XVD, MGD) +DPP = (BFQ, XDD) +CNV = (LQC, JJH) +LLH = (CFP, BGF) +XCK = (VDX, GFC) +KGD = (LSF, FNK) +MJA = (FXB, QVX) +QLH = (KRM, KVD) +QCR = (TKN, RNB) +PSR = (FBL, HKJ) +MGK = (BVC, HVL) +PVK = (JRN, SMV) +JTD = (VNS, FGJ) +PMD = (HGN, NBM) +DRF = (CPR, RTX) +HJL = (CBR, VDR) +PPB = (GDX, DXB) +DVR = (LLT, GVJ) +JRN = (RLD, RSL) +NXM = (RBN, NVD) +RLV = (FRM, FJB) +SJB = (KMG, GLP) +KJM = (XJH, LQX) +GRB = (HHL, RGD) +LQC = (BMC, XSH) +NRB = (NQD, RFT) +SQH = (QJT, JXX) +JLX = (RJL, HHH) +HVR = (XPN, JFM) +FVD = (RXS, RHH) +KSX = (TCB, GDK) +GKJ = (TQF, HQJ) +HQL = (BMR, PBX) +QFP = (NJM, FSB) +TPH = (NXT, RKN) +SRL = (LSP, LFV) +SDL = (MGL, PSK) +MFX = (FSM, LQF) +RFT = (FLV, GMS) +BTG = (DRS, PVC) +HLR = (DSB, DPP) +DXB = (BPP, GRV) +NHS = (HQG, GVP) +GKK = (DCM, RLT) +MJT = (JNR, PGC) +KDS = (FFD, XPC) +TSS = (BGX, QQX) +FKC = (NBN, SJP) +HHQ = (GVP, HQG) +JKF = (QRR, GFD) +CXG = (SDD, TMN) +GCG = (TCC, TDT) +NQX = (DMQ, DPM) +GHX = (BJQ, CHJ) +JQC = (HNQ, RJF) +QBB = (GNH, XSC) +BJG = (VMH, FCN) +VMS = (KRX, VLQ) +GSF = (NQM, KBH) +JQQ = (PKD, GNB) +KFG = (BGX, QQX) +TTV = (SNB, JQF) +CXJ = (CND, LSC) +GGP = (PBH, XNG) +FCV = (NLP, QJK) +NSB = (KSX, SLL) +JBH = (RGK, NSS) +CQH = (HJL, FKR) +VRX = (HKJ, FBL) +HJZ = (QVX, FXB) +RLD = (BJP, RLV) +HHH = (PNJ, HPJ) +LSC = (NRP, DCF) +BVM = (RCG, QLL) +KGN = (PRB, MLT) +NTV = (MRQ, NHQ) +VXT = (VFH, MBX) +RLG = (MJQ, RNL) +JVX = (HJQ, FNV) +XGH = (HHK, JXT) +NHC = (HPX, LGG) +VPC = (XCL, HPQ) +HKJ = (RQC, TMK) +PGQ = (FTX, MNP) +MPF = (KNM, BJG) +MFT = (DRS, PVC) +XNG = (RCS, JNH) +RMH = (GHD, MPF) +PFM = (PGQ, XHJ) +TRN = (TCP, TCP) +NHP = (JMG, VGP) +JSK = (JBG, PVM) +FSB = (MGK, HTD) +BPR = (VFH, MBX) +RHM = (LHD, PTF) +PRV = (RJL, HHH) +GNC = (HVR, PSV) +PSV = (JFM, XPN) +KMG = (KDR, RTV) +RKL = (DPP, DSB) +GLN = (QJT, JXX) +FNK = (XXP, QDR) +JDP = (HVR, PSV) +HHD = (VPC, MDS) +XHJ = (MNP, FTX) +XVJ = (RGG, BCB) +DRH = (CDK, JFK) +BMC = (TTQ, KHR) +TCT = (JQD, QBB) +BCS = (HLV, MKR) +LFV = (GTL, NSX) +JCS = (JQC, NDG) +SBJ = (PHS, QMN) +HPZ = (DQD, PFP) +BFM = (PMD, JGB) +QBL = (KVC, TXK) +RGD = (NXH, KQQ) +PBX = (LBP, FPK) +FDD = (TCX, CSN) +RJT = (CQG, JSQ) +BMR = (FPK, LBP) +RBN = (DRF, VJB) +PHB = (NXR, LPM) +BPN = (PPX, PPX) +KVC = (NSF, TQK) +PXB = (GJH, JHM) +BCB = (NTR, KKB) +KXM = (NHS, HHQ) +VTT = (NCB, HCR) +SHP = (LQX, XJH) +RCG = (CLL, TCT) +LHG = (GSF, PRJ) +XCL = (JLX, PRV) +LXB = (RHH, RXS) +FKZ = (TJS, BJB) +NNH = (CFD, XMX) +NTD = (NCX, PVK) +DCF = (JHJ, VMN) +GJH = (JTD, CJD) +VBS = (CDQ, LFQ) +MGL = (GGB, QNN) +TXK = (NSF, TQK) +HRX = (QFP, BJR) +GMS = (GKJ, TNF) +RGA = (PFP, DQD) +KTS = (GSF, PRJ) +TPP = (VPC, MDS) +JNV = (BHV, XQK) +DXL = (HDP, KTG) +MBR = (GRS, GTG) +KVJ = (LPH, NGG) +HRG = (RNL, MJQ) +XHL = (JXF, FVH) +MMC = (FHM, HNF) +HGC = (SHT, HBF) +LPS = (NTV, CGR) +FKR = (CBR, VDR) +BHV = (PQG, QTK) +BKF = (SRP, DRH) +JMA = (BJB, TJS) +MPT = (HRX, VSD) +QHL = (NRB, HJG) +PDG = (KJM, SHP) +HFT = (HHQ, NHS) +SJD = (GPM, PPB) +NSF = (NRX, SRL) +MXG = (JVJ, BMF) +PHD = (BQK, VKV) +VBH = (TXK, KVC) +NJM = (HTD, MGK) +TVV = (LLH, HFB) +RPS = (GGQ, SNK) +HPR = (LJS, DJR) +FDR = (QKT, GRX) +LLT = (SHV, NRL) +VQC = (DPM, DMQ) +MJQ = (CLD, FCV) +BFG = (GJH, JHM) +GFS = (PMP, VXL) +LBP = (HRF, GRB) +BXC = (MFS, NRM) +CFD = (QMQ, HPR) +HPN = (JQC, NDG) +BBJ = (JTL, QQK) +VVL = (CDN, STB) +HFB = (CFP, BGF) +NNG = (XVP, CQH) +QKM = (KDS, FRP) +VJB = (CPR, RTX) +KQB = (XCK, BSF) +LKS = (LDJ, MXG) +GTL = (FVD, LXB) +PJS = (BGV, MLM) +KNM = (FCN, VMH) +FCN = (VGR, KHV) +RPJ = (XKD, BPM) +GLP = (KDR, RTV) +NXL = (VTS, SDL) +XDX = (MPT, FXH) +KRX = (DCD, DHH) +CTP = (CRQ, DPL) +SRG = (SKH, SLF) +QVX = (NDC, NPL) +XVK = (SNB, JQF) +RBT = (NSD, SBJ) +RXS = (FKC, JSS) +SFX = (PRB, MLT) +SRS = (FVH, JXF) +NRL = (RLG, HRG) +QKK = (PBX, BMR) +DPL = (PTQ, DBH) +PFD = (JQV, GKK) +VGR = (KMX, DVR) +FQX = (LHD, PTF) +LXT = (RHM, FQX) +JHV = (MBR, PHJ) +JNN = (VKG, SLT) +XDK = (DRH, SRP) +JBR = (BDR, GFS) +BNM = (VKG, SLT) +CJD = (VNS, FGJ) +FPK = (HRF, GRB) +PBH = (JNH, RCS) +FGV = (FDR, TMD) +LSF = (XXP, QDR) +RBM = (VHG, BDL) +TNF = (HQJ, TQF) +TRM = (JHT, BCG) +GBH = (XMJ, JFF) +DBH = (DSS, RQL) +PGB = (BXR, DXL) +QFR = (TDT, TCC) +HHL = (NXH, KQQ) +HGN = (BFG, PXB) +PXC = (BPN, BPN) +NDF = (VQC, NQX) +GSK = (BVV, SBX) +TCM = (VBS, HCN) +HTD = (BVC, HVL) +SHD = (MHG, HNG) +LQX = (QVF, LBV) +MSF = (FDF, VLP) +NRP = (VMN, JHJ) +TQF = (BXC, JCR) +MBX = (GML, FDD) +JCR = (MFS, NRM) +NTR = (PCN, RNT) +JHJ = (XMT, NPT) +SQX = (CDN, STB) +CSN = (GBJ, PGB) +GDJ = (GBM, GCJ) +XGL = (HJQ, FNV) +PLD = (BFL, BFL) +NRX = (LFV, LSP) +TFF = (HGQ, MJT) +JVJ = (TMS, HPK) +BSF = (VDX, GFC) +GML = (CSN, TCX) +BFJ = (GFD, QRR) +FGJ = (PGF, VMS) +TQK = (SRL, NRX) +GQD = (MDD, HLQ) +TJX = (XCG, DJH) +GRR = (LPM, NXR) +PTQ = (DSS, DSS) +HHK = (KLD, NNG) +FBR = (KXM, HFT) +RLT = (JMK, DLP) +PHL = (QHR, RMH) +DVM = (JTP, KDM) +MNF = (RPJ, RMF) +RMF = (BPM, XKD) +GGQ = (MFT, BTG) +CLD = (NLP, QJK) +NMR = (FNL, LXT) +CLX = (TRP, GMD) +QMQ = (DJR, LJS) +KDR = (PKC, NRF) +KKG = (VHG, BDL) +FBQ = (TPP, HHD) +QVV = (LNR, GSK) +VKV = (MFX, FDL) +HJG = (NQD, RFT) +XVD = (VXT, BPR) +NCX = (SMV, JRN) +QLN = (CDJ, TDK) +GFC = (CKR, LNC) +HGQ = (JNR, PGC) +NDG = (RJF, HNQ) +CBC = (NSD, SBJ) +BQK = (FDL, MFX) +VGV = (HGC, TQG) +VGP = (RJT, KPK) +VMN = (XMT, NPT) +PSH = (NSS, RGK) +PPL = (FXH, MPT) +DCD = (SBR, DTS) +MDD = (MQX, FQT) +XCG = (XVK, TTV) +LFQ = (SNS, VBL) +JHT = (FMN, HMC) +KNQ = (QKM, DPS) +PVM = (CHL, GLT) +JMG = (KPK, RJT) +XKD = (GQJ, NXL) +DGG = (CCB, CQX) +HNF = (MNC, FKZ) +QTL = (PSH, JBH) +RNL = (CLD, FCV) +BDR = (PMP, VXL) +GKH = (KXM, HFT) +RQC = (DVM, BJM) +GSR = (PPL, XDX) +JQD = (GNH, XSC) +GRS = (RTN, MPH) +BPP = (GBH, KQX) +XVP = (HJL, FKR) +PKZ = (NMR, KJK) +SLT = (BVM, KMJ) +XHA = (KJK, NMR) +BQQ = (FDR, TMD) +GGC = (CXJ, PTJ) +NBM = (PXB, BFG) +RQL = (BBH, NLT) +KJK = (FNL, LXT) +PSK = (GGB, QNN) +FQT = (DRL, NDS) +SJT = (VQC, NQX) +QHT = (GFS, BDR) +QJT = (PJS, DNG) +SVT = (PDG, GSS) +MBQ = (PPL, XDX) +VHL = (PVM, JBG) +QCJ = (JKK, JSR) +NQH = (LKQ, FBG) +XNJ = (QNF, LPL) +PQV = (CKJ, JHV) +FHM = (MNC, MNC) +FPN = (DLQ, BGR) +BJR = (NJM, FSB) +HPQ = (PRV, JLX) +KMJ = (QLL, RCG) +FTX = (TSM, PDR) +JXT = (KLD, NNG) +DPS = (KDS, FRP) +KKB = (RNT, PCN) +XCB = (TDM, HXC) +TCP = (PFP, DQD) +CDK = (NDF, SJT) +HCR = (HSP, PFD) +SNK = (BTG, MFT) +TKN = (QTL, HPL) +GSS = (KJM, SHP) +NRF = (SVT, RGV) +FLV = (GKJ, TNF) +QPK = (FPN, DRM) +RNB = (QTL, HPL) +HPJ = (XGL, JVX) +NSD = (QMN, PHS) +JXF = (DQV, XPX) +PRJ = (KBH, NQM) +XMT = (NGC, FQM) +JLP = (QNF, LPL) +RND = (HLV, MKR) +QRR = (GPQ, GLL) +LNR = (BVV, SBX) +PQG = (TXR, NTD) +JXX = (PJS, DNG) +QQX = (VTT, XKV) +RRJ = (GLS, GGP) +MLM = (VCD, BTQ) +QVG = (TMM, CTP) +KRM = (MSF, HVT) +XKV = (HCR, NCB) +LJX = (RNB, TKN) +CCB = (NXM, QSG) +RJF = (FQP, VDH) +XBN = (BJQ, CHJ) +JHM = (JTD, CJD) +SMV = (RSL, RLD) +PDR = (GHX, XBN) +JFK = (NDF, SJT) +HCN = (LFQ, CDQ) +SLL = (TCB, GDK) +VBL = (JBR, QHT) +SMK = (RBM, KKG) +GDK = (QXQ, RVR) +KQX = (XMJ, JFF) +LKQ = (HLN, VTD) +JSQ = (QXG, CLX) +FFD = (FRX, SSS) +NRM = (XBP, NQH) +SBR = (PQQ, SRG) +BKR = (MHG, HNG) +QQK = (GQK, STS) +HVL = (DLF, QLH) +NHT = (PTJ, CXJ) +GLL = (TLL, LRR) +GLS = (PBH, XNG) +NHB = (QQK, JTL) +PFS = (KFG, TSS) +PCN = (PFS, QFB) +CJV = (BFL, PKZ) +JFM = (FKG, CXG) +GFD = (GLL, GPQ) +MDS = (XCL, HPQ) +FXH = (VSD, HRX) +DQD = (RPR, LPS) +HPX = (RRJ, FCK) +JNR = (SQQ, SQQ) +BGR = (PQV, DKS) +BRN = (BSF, XCK) +RVS = (QKM, DPS) +PLH = (GPM, PPB) +XSM = (QFS, GQD) +TTH = (TQG, HGC) +KBJ = (KTS, LHG) +RKN = (PCX, NSB) +TPK = (PFM, RFN) +MNC = (BJB, TJS) +PMM = (GRR, PHB) +QKT = (BNK, QKR) +HQG = (JLP, XNJ) +RRD = (JGB, PMD) +CPR = (TGM, VXS) +GGM = (GCJ, GBM) +HBF = (FQG, PHL) +NXH = (DPF, GKD) +TMD = (GRX, QKT) +FBL = (RQC, TMK) +GNB = (DKH, TNC) +LQF = (LKS, KPG) +BKN = (TRN, TRN) +QJK = (BLT, XVJ) +HLV = (TJX, XPQ) +XPX = (TPK, HQN) +BJP = (FJB, FRM) +GHD = (KNM, BJG) +XMX = (HPR, QMQ) +FNV = (NHT, GGC) +JGB = (HGN, NBM) +PKH = (HHK, JXT) +JXN = (VRR, VRR) +CHJ = (TLF, QSN) +XBP = (LKQ, FBG) +QTK = (TXR, NTD) +PKC = (SVT, RGV) +JNH = (MGV, MPJ) +FXB = (NDC, NPL) +XHQ = (KTS, LHG) +MFS = (NQH, XBP) +FQM = (XJB, TXN) +QNN = (JQQ, GBG) +GBG = (PKD, GNB) +TMN = (GRC, BCV) +HMN = (KKG, RBM) +DHH = (SBR, DTS) +KPG = (LDJ, MXG) +FDL = (LQF, FSM) +FXX = (LLH, HFB) +VSD = (BJR, QFP) +HVT = (FDF, VLP) +FRM = (CBB, GMX) +GQK = (QVV, QBV) +CKJ = (PHJ, MBR) +JJH = (XSH, BMC) +SQQ = (PLD, PLD) +KPK = (JSQ, CQG) +VLP = (HHT, MMC) +NLP = (XVJ, BLT) +VTS = (MGL, PSK) +DTS = (SRG, PQQ) +VCD = (GDJ, GGM) +VRR = (HLR, RKL) +VXS = (BKN, SRB) +GMD = (PSR, VRX) +PFK = (HXC, TDM) +SJP = (VSM, NNH) +TDK = (SRS, XHL) +KRS = (GCV, SJB) +MRQ = (CJK, PQD) +XJB = (JRK, RPS) +BGF = (QCR, LJX) +MLT = (MMF, DGG) +TCC = (MNF, KKL) +QMN = (GLN, SQH) +GQJ = (VTS, SDL) +BFQ = (SMK, HMN) +NSS = (JPQ, HXV) +MHG = (VGV, TTH) +KBH = (GPL, XCV) +DRL = (KGD, HNX) +HMC = (QDF, RGR) +QSN = (FBR, GKH) +SDD = (GRC, BCV) +TGH = (BPN, SSQ) +HNG = (TTH, VGV) +RHH = (FKC, JSS) +DQA = (MVV, LQJ) +QFB = (KFG, TSS) +TQG = (SHT, HBF) +KDM = (QKK, HQL) +XHV = (PLD, CJV) +PQD = (TPH, PTN) +SSS = (SQX, VVL) +GPM = (DXB, GDX) +KLD = (CQH, XVP) +LRR = (FXX, TVV) +HPL = (JBH, PSH) +TMS = (BQQ, FGV) +MMF = (CCB, CQX) +DLQ = (PQV, DKS) +PHJ = (GTG, GRS) +TLF = (GKH, FBR) +FJB = (CBB, GMX) +PTF = (PSF, PHD) +NPL = (RTG, QHL) +XMJ = (XHQ, KBJ) +PMP = (TRM, PJK) +JPQ = (KLM, TCM) +BCG = (FMN, HMC) +DRS = (MGD, XVD) +RGT = (PKH, XGH) +TGM = (BKN, BKN) +BPM = (GQJ, NXL) +VDX = (CKR, LNC) +XJH = (QVF, LBV) +MGD = (BPR, VXT) +RGR = (JSK, VHL) +SNS = (QHT, JBR) +SRB = (TRN, DVK) +NRQ = (LQC, JJH) +PSF = (BQK, VKV) +BMF = (TMS, HPK) +LGG = (FCK, RRJ) +HPK = (FGV, BQQ) +QBV = (GSK, LNR) +FNF = (PHB, GRR) +GLT = (JDP, GNC) +DKS = (JHV, CKJ) +RGV = (GSS, PDG) +HQN = (PFM, RFN) +GKD = (BFJ, JKF) +HXC = (HPN, JCS) +MGH = (BVB, FBQ) +LBV = (XCB, PFK) +LHD = (PHD, PSF) +CDQ = (SNS, VBL) +BTQ = (GGM, GDJ) +HMS = (CBC, RBT) +VTD = (CNV, NRQ) +JBG = (GLT, CHL) +LCB = (NGG, LPH) +FKG = (SDD, TMN) +BVV = (DDL, MGH) +RGG = (KKB, NTR) +FBG = (HLN, VTD) +KMX = (GVJ, LLT) +HRF = (HHL, RGD) +DGM = (QFS, GQD) +LPM = (QFR, GCG) +QXQ = (BCS, RND) +BGV = (BTQ, VCD) +BGX = (XKV, VTT) +XDR = (VRR, ZZZ) +BJM = (JTP, KDM) +RFN = (PGQ, XHJ) +DDL = (FBQ, BVB) +XCV = (JNN, BNM) +TCX = (GBJ, PGB) +QXG = (TRP, GMD) +VKG = (BVM, KMJ) +RSL = (RLV, BJP) +CDN = (QLN, CNM) +RVR = (BCS, RND) +BBH = (BXJ, BXJ) +BXR = (KTG, HDP) +DJH = (XVK, TTV) +DVK = (TCP, HPZ) +SLF = (TFF, KQV) +DJR = (SFX, KGN) +HHT = (FHM, FHM) +JSR = (JXM, JNV) +DSB = (BFQ, XDD) +DPM = (RVS, KNQ) +HJQ = (NHT, GGC) +ZZZ = (RKL, HLR) +RJL = (HPJ, PNJ) +BJQ = (TLF, QSN) +HQJ = (BXC, JCR) +FQP = (HMS, SRH) +PGF = (VLQ, KRX) +LQJ = (FNF, PMM) +JXM = (BHV, XQK) +PNJ = (JVX, XGL) +STB = (CNM, QLN) +BBS = (JXN, JXN) +KKL = (RMF, RPJ) +SHV = (HRG, RLG) +FPQ = (FPN, DRM) +GBJ = (DXL, BXR) +QHR = (GHD, MPF) +MDG = (JKK, JSR) +CRQ = (PTQ, DBH) +BVB = (TPP, HHD) +GRC = (RGT, VDD) +SKH = (TFF, KQV) +DHZ = (LQJ, MVV) +LSP = (NSX, GTL) +MPJ = (QBL, VBH) +TDT = (KKL, MNF) +TXN = (JRK, RPS) +HSP = (GKK, JQV) +JTL = (STS, GQK) +GBM = (QCJ, MDG) +HDP = (LLX, QVG) +GMX = (KQB, BRN) +PJK = (JHT, BCG) +NDC = (RTG, QHL) +LPL = (GSR, MBQ) +VLQ = (DCD, DHH) +QLL = (CLL, TCT) +RTV = (NRF, PKC) +DKH = (BBJ, NHB) +NGC = (XJB, TXN) +CNM = (CDJ, TDK) +XXP = (BSP, NHC) +FNL = (RHM, FQX) +NBN = (VSM, NNH) +XSC = (BFM, RRD) +VXL = (PJK, TRM) +VSM = (XMX, CFD) +NQM = (GPL, XCV) +HLN = (CNV, NRQ) +GCJ = (QCJ, MDG) +FDF = (HHT, HHT) +PQQ = (SKH, SLF) +KVD = (MSF, HVT) +QSG = (NVD, RBN) +RGK = (HXV, JPQ) +NXR = (GCG, QFR) +QDR = (BSP, NHC) +TDM = (HPN, JCS) +MQX = (NDS, DRL) +JRK = (GGQ, SNK) +VMH = (VGR, KHV) +RPR = (NTV, CGR) +CFP = (LJX, QCR) +CLL = (JQD, QBB) +LLX = (CTP, TMM) +PRB = (DGG, MMF) +FVH = (XPX, DQV) +JKK = (JNV, JXM) +KLM = (VBS, HCN) +NHQ = (CJK, PQD) +BJB = (BKR, SHD) +CQX = (NXM, QSG) +KHV = (DVR, KMX) +SRH = (CBC, RBT) +DQV = (TPK, HQN) +NQD = (GMS, FLV) +PHS = (GLN, SQH) +GPL = (JNN, BNM) +JSS = (SJP, NBN) +CGR = (MRQ, NHQ) +PGC = (SQQ, XHV) +GPQ = (LRR, TLL) +HXV = (TCM, KLM) +BFL = (KJK, NMR) +PPX = (FXB, QVX) +AAA = (HLR, RKL) +DSS = (BBH, BBH) +VDD = (PKH, XGH) +NCB = (PFD, HSP) +SSQ = (PPX, HJZ) +DNG = (MLM, BGV) +CDJ = (XHL, SRS) +TNC = (NHB, BBJ) +QDF = (VHL, JSK) +GTG = (MPH, RTN) +FRX = (SQX, VVL) +MVV = (FNF, PMM) +QFS = (HLQ, MDD) +MNP = (PDR, TSM) +LDJ = (BMF, JVJ) +NSX = (FVD, LXB) +RNT = (PFS, QFB) +TJS = (SHD, BKR) +HNQ = (VDH, FQP) +BLT = (BCB, RGG) +KQV = (HGQ, MJT) +PTN = (NXT, RKN) +VDR = (BBS, PCT) +RCS = (MPJ, MGV) +GRX = (BNK, QKR) +JFF = (XHQ, KBJ) +RTG = (NRB, HJG) +CND = (DCF, NRP) +DCM = (JMK, DLP) +XPQ = (XCG, DJH) +RTX = (TGM, VXS) +DPF = (BFJ, JKF) +LNC = (PXC, TGH) +PCX = (SLL, KSX) +BSP = (HPX, LGG) +VHG = (LCH, NHP) +GRV = (KQX, GBH) +NGG = (DGM, XSM) +XSH = (TTQ, KHR) +MRH = (KVJ, LCB) +TXR = (NCX, PVK) +NVD = (VJB, DRF) +TTQ = (FPQ, QPK) +CKR = (PXC, PXC) +BVC = (DLF, QLH) +VDH = (SRH, HMS) +JQF = (SKC, MRH) +CBB = (BRN, KQB) +FMN = (RGR, QDF) +SHT = (FQG, PHL) +NLT = (BXJ, DHZ) +MPH = (KRS, XNV) +BXJ = (MVV, LQJ) +CHL = (JDP, GNC) +TSM = (XBN, GHX) +DLF = (KRM, KVD) +BCV = (RGT, VDD) +HNX = (FNK, LSF) +LJS = (SFX, KGN) +STS = (QBV, QVV) +SKC = (KVJ, LCB) +BNK = (SJD, PLH) +RTN = (KRS, XNV) +JTP = (QKK, HQL) +LCH = (VGP, JMG) +CBR = (BBS, BBS) +VNS = (VMS, PGF) +CQG = (CLX, QXG) +HLQ = (MQX, FQT) +TMM = (CRQ, DPL) +BDL = (NHP, LCH) +TRP = (VRX, PSR) +MGV = (VBH, QBL) +GNH = (BFM, RRD) +NXT = (NSB, PCX) +SNB = (SKC, MRH) +LPH = (XSM, DGM) +GGB = (GBG, JQQ) +CJK = (PTN, TPH) +QVF = (PFK, XCB) \ No newline at end of file diff --git a/y2023/ex08/src/lib.rs b/y2023/ex08/src/lib.rs new file mode 100644 index 0000000..2abb0ec --- /dev/null +++ b/y2023/ex08/src/lib.rs @@ -0,0 +1,95 @@ +use models::parse_input; +use num::integer::lcm; + +mod models; + +pub fn part1(input: &str) -> usize { + let (_, (directions, paths)) = parse_input(input).unwrap(); + let mut current = "AAA"; + let target = "ZZZ"; + let mut steps = 0; + + while current != target { + let next = paths + .next(current, directions[steps % directions.len()]) + .unwrap(); + current = next; + steps += 1; + } + + steps +} + +pub fn part2(input: &str) -> usize { + let (_, (directions, paths)) = parse_input(input).unwrap(); + let current_nodes = paths + .keys() + .copied() + .filter(|k| k.ends_with('A')) + .collect::>(); + + // HACK: looks like for every node there's a loop that can be easily found + // by getting the index of the first node that ends with 'Z' + let first_z_index: Vec = current_nodes + .iter() + .map(|start_node| { + let mut steps = 0; + let mut current_node = *start_node; + while !current_node.ends_with('Z') { + let next = paths + .next(current_node, directions[steps % directions.len()]) + .unwrap(); + current_node = next; + steps += 1; + } + + steps + }) + .collect(); + + println!("{:?}", first_z_index); + + // calculates the LCM (lowest common multiplier) of all the first Z indices + first_z_index.iter().fold(1, |acc, x| lcm(acc, *x)) +} + +#[cfg(test)] +mod tests { + use super::*; + const INPUT: &str = include_str!("../input.txt"); + const EXAMPLE_INPUT_PART1: &str = "LLR + +AAA = (BBB, BBB) +BBB = (AAA, ZZZ) +ZZZ = (ZZZ, ZZZ)"; + const EXAMPLE_INPUT_PART2: &str = "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)"; + + #[test] + fn test_part1_example() { + assert_eq!(part1(EXAMPLE_INPUT_PART1), 6); + } + + #[test] + fn test_part1() { + assert_eq!(part1(INPUT), 19631); + } + + #[test] + fn test_part2_example() { + assert_eq!(part2(EXAMPLE_INPUT_PART2), 6); + } + + #[test] + fn test_part2() { + assert_eq!(part2(INPUT), 21003205388413); + } +} diff --git a/y2023/ex08/src/models.rs b/y2023/ex08/src/models.rs new file mode 100644 index 0000000..fe41961 --- /dev/null +++ b/y2023/ex08/src/models.rs @@ -0,0 +1,106 @@ +use std::{ + collections::HashMap, + fmt::{self, Display, Formatter}, + ops::Deref, +}; + +use nom::{ + branch::alt, + bytes::complete::{is_a, tag}, + character::complete::{line_ending, one_of}, + combinator::{complete, eof}, + multi::many1, + sequence::tuple, + IResult, +}; + +#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)] +pub enum Direction { + Left = 0, + Right = 1, +} + +impl Display for Direction { + fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result { + match self { + Direction::Left => write!(f, "L"), + Direction::Right => write!(f, "R"), + } + } +} + +fn parse_direction(input: &str) -> IResult<&str, Direction> { + let (input, c) = one_of("LR")(input)?; + let direction = match c { + 'L' => Direction::Left, + 'R' => Direction::Right, + _ => unreachable!("Invalid direction: {}", c), + }; + + Ok((input, direction)) +} + +fn parse_directions(input: &str) -> IResult<&str, Vec> { + let (input, directions) = many1(parse_direction)(input)?; + Ok((input, directions)) +} + +#[derive(Debug, Clone)] +pub struct Paths<'a>(HashMap<&'a str, [&'a str; 2]>); + +impl<'a> Paths<'a> { + fn new() -> Self { + Self(HashMap::new()) + } + + fn insert(&mut self, from: &'a str, left: &'a str, right: &'a str) { + self.0.insert(from, [left, right]); + } + + fn get(&self, from: &'a str) -> Option<[&'a str; 2]> { + self.0.get(from).copied() + } + + pub fn next(&self, from: &'a str, direction: Direction) -> Option<&'a str> { + self.get(from).map(|next| next[direction as usize]) + } +} + +impl<'a> Deref for Paths<'a> { + type Target = HashMap<&'a str, [&'a str; 2]>; + + fn deref(&self) -> &Self::Target { + &self.0 + } +} + +fn parse_path_record(input: &str) -> IResult<&str, (&str, &str, &str)> { + let label = is_a("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"); + let (input, from) = label(input)?; + let (input, _) = tag(" = (")(input)?; + let (input, left) = label(input)?; + let (input, _) = tag(", ")(input)?; + let (input, right) = label(input)?; + let (input, _) = tag(")")(input)?; + let (input, _) = alt((line_ending, eof))(input)?; + + Ok((input, (from, left, right))) +} + +fn parse_paths(input: &str) -> IResult<&str, Paths> { + let (input, records) = complete(many1(parse_path_record))(input)?; + let mut paths = Paths::new(); + for (from, left, right) in records { + paths.insert(from, left, right); + } + + Ok((input, paths)) +} + +pub fn parse_input(input: &str) -> IResult<&str, (Vec, Paths)> { + let (input, directions) = parse_directions(input)?; + let (input, _) = tuple((line_ending, line_ending))(input)?; + let (input, paths) = parse_paths(input)?; + + Ok((input, (directions, paths))) +}