From 9594c294676a926847c3021758df43b4d874f318 Mon Sep 17 00:00:00 2001
From: Christian <me@ctsk.xyz>
Date: Thu, 21 Dec 2023 17:37:32 +0100
Subject: [PATCH] Up to Day 21 (excluding day 16)

---
 Cargo.lock       |  238 +++++++++
 Cargo.toml       |    5 +
 data/06.in       |    2 +
 data/07.in       | 1000 +++++++++++++++++++++++++++++++++++
 data/08.in       |  748 ++++++++++++++++++++++++++
 data/09.in       |  200 +++++++
 data/10.in       |  140 +++++
 data/11.in       |  140 +++++
 data/12.in       | 1000 +++++++++++++++++++++++++++++++++++
 data/13.in       | 1295 ++++++++++++++++++++++++++++++++++++++++++++++
 data/14.in       |  100 ++++
 data/15.in       |    1 +
 data/17.in       |  141 +++++
 data/18.in       |  694 +++++++++++++++++++++++++
 data/19.in       |  777 ++++++++++++++++++++++++++++
 data/20.in       |   58 +++
 data/21.in       |  131 +++++
 flake.nix        |    2 +
 src/bin/day05.rs |    2 +-
 src/bin/day06.rs |   39 ++
 src/bin/day07.rs |  142 +++++
 src/bin/day08.rs |   49 ++
 src/bin/day09.rs |   48 ++
 src/bin/day10.rs |  184 +++++++
 src/bin/day11.rs |   43 ++
 src/bin/day12.rs |   99 ++++
 src/bin/day13.rs |   47 ++
 src/bin/day14.rs |  104 ++++
 src/bin/day15.rs |   46 ++
 src/bin/day17.rs |   78 +++
 src/bin/day18.rs |   56 ++
 src/bin/day19.rs |  160 ++++++
 src/bin/day20.rs |  175 +++++++
 src/bin/day21.rs |  160 ++++++
 34 files changed, 8103 insertions(+), 1 deletion(-)
 create mode 100644 data/06.in
 create mode 100644 data/07.in
 create mode 100644 data/08.in
 create mode 100644 data/09.in
 create mode 100644 data/10.in
 create mode 100644 data/11.in
 create mode 100644 data/12.in
 create mode 100644 data/13.in
 create mode 100644 data/14.in
 create mode 100644 data/15.in
 create mode 100644 data/17.in
 create mode 100644 data/18.in
 create mode 100644 data/19.in
 create mode 100644 data/20.in
 create mode 100644 data/21.in
 create mode 100644 src/bin/day06.rs
 create mode 100644 src/bin/day07.rs
 create mode 100644 src/bin/day08.rs
 create mode 100644 src/bin/day09.rs
 create mode 100644 src/bin/day10.rs
 create mode 100644 src/bin/day11.rs
 create mode 100644 src/bin/day12.rs
 create mode 100644 src/bin/day13.rs
 create mode 100644 src/bin/day14.rs
 create mode 100644 src/bin/day15.rs
 create mode 100644 src/bin/day17.rs
 create mode 100644 src/bin/day18.rs
 create mode 100644 src/bin/day19.rs
 create mode 100644 src/bin/day20.rs
 create mode 100644 src/bin/day21.rs

diff --git a/Cargo.lock b/Cargo.lock
index 493e2d2..0f0a41a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,18 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "ahash"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91429305e9f0a25f6205c5b8e0d2db09e0708a7a6df0f42212bb56c32c8ac97a"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "1.1.2"
@@ -11,6 +23,12 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "allocator-api2"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0942ffc6dcaadf03badf6e6a2d0228460359d5e34b57ccdc720b7382dfbd5ec5"
+
 [[package]]
 name = "anyhow"
 version = "1.0.75"
@@ -22,15 +40,192 @@ name = "aoc-2023"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "gcd",
+ "hashbrown",
+ "itertools",
+ "ndarray",
+ "num",
  "regex",
 ]
 
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "either"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
+
+[[package]]
+name = "gcd"
+version = "2.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d758ba1b47b00caf47f24925c0074ecb20d6dfcffe7f6d53395c0465674841a"
+
+[[package]]
+name = "hashbrown"
+version = "0.14.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "290f1a1d9242c78d09ce40a5e87e7554ee637af1351968159f4952f028f75604"
+dependencies = [
+ "ahash",
+ "allocator-api2",
+]
+
+[[package]]
+name = "itertools"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "25db6b064527c5d482d0423354fcd07a89a2dfe07b67892e62411946db7f07b0"
+dependencies = [
+ "either",
+]
+
+[[package]]
+name = "matrixmultiply"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7574c1cf36da4798ab73da5b215bbf444f50718207754cb522201d78d1cd0ff2"
+dependencies = [
+ "autocfg",
+ "rawpointer",
+]
+
 [[package]]
 name = "memchr"
 version = "2.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f665ee40bc4a3c5590afb1e9677db74a508659dfd71e126420da8274909a0167"
 
+[[package]]
+name = "ndarray"
+version = "0.15.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adb12d4e967ec485a5f71c6311fe28158e9d6f4bc4a447b474184d0f91a8fa32"
+dependencies = [
+ "matrixmultiply",
+ "num-complex",
+ "num-integer",
+ "num-traits",
+ "rawpointer",
+]
+
+[[package]]
+name = "num"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b05180d69e3da0e530ba2a1dae5110317e49e3b7f3d41be227dc5f92e49ee7af"
+dependencies = [
+ "num-bigint",
+ "num-complex",
+ "num-integer",
+ "num-iter",
+ "num-rational",
+ "num-traits",
+]
+
+[[package]]
+name = "num-bigint"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "608e7659b5c3d7cba262d894801b9ec9d00de989e8a82bd4bef91d08da45cdc0"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-complex"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ba157ca0885411de85d6ca030ba7e2a83a28636056c7c699b07c8b6f7383214"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "num-integer"
+version = "0.1.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
+[[package]]
+name = "num-iter"
+version = "0.1.43"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d03e6c028c5dc5cac6e2dec0efda81fc887605bb3d884578bb6d6bf7514e252"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-rational"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0638a1c9d0a3c0914158145bc76cff373a75a627e6ecbfb71cbe6f453a5a19b0"
+dependencies = [
+ "autocfg",
+ "num-bigint",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "39e3200413f237f41ab11ad6d161bc7239c84dcb631773ccd7de3dfe4b5c267c"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "once_cell"
+version = "1.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.70"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "39278fbbf5fb4f646ce651690877f89d1c5811a3d4acb27700c1cb3cdb78fd3b"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rawpointer"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60a357793950651c4ed0f3f52338f53b2f809f32d83a07f72909fa13e4c6c1e3"
+
 [[package]]
 name = "regex"
 version = "1.10.2"
@@ -59,3 +254,46 @@ name = "regex-syntax"
 version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
+
+[[package]]
+name = "syn"
+version = "2.0.41"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44c8b28c477cc3bf0e7966561e3460130e1255f7a1cf71931075f1c5e7a7e269"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
+[[package]]
+name = "zerocopy"
+version = "0.7.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c4061bedbb353041c12f413700357bec76df2c7e2ca8e4df8bac24c6bf68e3d"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b3c129550b3e6de3fd0ba67ba5c81818f9805e58b8d7fee80a3a59d2c9fc601a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 0c835e1..8c1e263 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,4 +7,9 @@ edition = "2021"
 
 [dependencies]
 anyhow = "1.0.75"
+gcd = "2.3.0"
+hashbrown = "0.14.3"
+itertools = "0.12.0"
+ndarray = "0.15.6"
+num = "0.4.1"
 regex = "1.10.2"
diff --git a/data/06.in b/data/06.in
new file mode 100644
index 0000000..27b64c4
--- /dev/null
+++ b/data/06.in
@@ -0,0 +1,2 @@
+Time:        58     81     96     76
+Distance:   434   1041   2219   1218
diff --git a/data/07.in b/data/07.in
new file mode 100644
index 0000000..564f3ec
--- /dev/null
+++ b/data/07.in
@@ -0,0 +1,1000 @@
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+KJJKK 523
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+3J2T3 975
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+JJ87K 667
+TTT2T 283
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diff --git a/data/08.in b/data/08.in
new file mode 100644
index 0000000..9bf3e0b
--- /dev/null
+++ b/data/08.in
@@ -0,0 +1,748 @@
+LLLRLRLRLLRRRLRRRLRRRLLLRLRLLRRLLRRLRLRLLRLRLRRLLRRRLRLLRRLRRRLRRLLLRRRLRRRLRRRLLLLRRLRRRLRLRRRLRRLLRLRLRRRLRRRLRRLRRRLLLLLLRLRRRLLLLRLRRRLRRRLRLRRLRLRLRLRLRRRLLRRLRLRRLRRLRRLLRLLLRRLRLLRRLRLRRLRRRLRRLLRLRLRLRRLLRLLRRLLLRLRLRRRLRRLLRRRLRLRLRRLLRLRLRLRRLRLRLRRLRRLLRRLRRRLRRRLLLRRRR
+
+MQF = (DDG, LSH)
+QJP = (PCT, XKJ)
+JXF = (PMG, NBN)
+JCK = (QCD, NRG)
+LPD = (NTM, NTM)
+DLN = (TXM, QRG)
+MTG = (KGC, DMM)
+KFV = (FXH, QLX)
+SCJ = (HQH, XSD)
+JKJ = (PMX, MHH)
+SJK = (JXM, GRQ)
+CJZ = (DPF, RMT)
+QXM = (HGC, SMX)
+XJS = (NRV, CCL)
+QLB = (RCH, QVQ)
+KDB = (QKT, BJB)
+FCX = (DXG, SGQ)
+PCT = (DXR, PTS)
+MGJ = (FKF, HNG)
+VBN = (RBK, JPL)
+TRH = (SRT, VJV)
+PGK = (SNP, QLP)
+XVK = (KFK, QQC)
+SXC = (XTB, DPQ)
+HNG = (VXF, MVH)
+QHT = (TTD, LBH)
+LMK = (QQT, QTP)
+DXR = (KCT, KQS)
+FSA = (RXT, BLP)
+GHK = (JMM, VBN)
+DMM = (VQM, LTG)
+FBQ = (FSV, GHJ)
+KCN = (QVR, TDG)
+KBF = (XNM, HBL)
+KJP = (FKG, CJZ)
+JLH = (CKG, XLV)
+RJX = (KKN, RJH)
+PFS = (BVC, SXR)
+DHM = (HXV, FRV)
+KFK = (PLL, GQC)
+CNB = (KNS, HVP)
+DDG = (QTS, VRJ)
+QVT = (JCK, DJQ)
+LRB = (TXD, MPR)
+DMS = (QVD, MFS)
+PMJ = (LNN, NPJ)
+BXD = (MLL, QKQ)
+DGF = (FMX, PKP)
+RHQ = (RJH, KKN)
+MRG = (TNN, LLX)
+BBM = (VFP, VGF)
+PLP = (BBK, KFX)
+RSN = (SBN, DQF)
+XTP = (HMT, XNV)
+LLX = (KBF, TDV)
+KHR = (QGL, NCM)
+PFB = (SXR, BVC)
+NKP = (JTF, BJH)
+RPH = (RSN, VBM)
+HBL = (LVT, JXF)
+CBC = (LRB, QGN)
+FXH = (GCH, KBD)
+QTF = (KVL, DLS)
+RPQ = (FJB, RMD)
+SLD = (MSH, NSN)
+PXF = (QXM, HDF)
+QBJ = (RDQ, DJH)
+QPH = (RKJ, CSC)
+TVF = (JMC, MTV)
+MJM = (DLM, BQS)
+XQV = (LCD, QCL)
+KQH = (SJK, BPR)
+CSC = (BLD, PDP)
+BLP = (XVK, LJB)
+BBK = (DJT, LLJ)
+PSH = (GQH, RBQ)
+RMD = (XQV, KFT)
+TJJ = (QLV, HPG)
+STS = (BSB, TMP)
+FPN = (TCK, GLD)
+JPF = (VCS, CMQ)
+NVX = (TLD, GMD)
+XLV = (LKV, QNK)
+GSF = (CKS, BVB)
+QHR = (KTV, KPG)
+JRX = (FPN, DTC)
+KGC = (VQM, LTG)
+SSK = (NHP, NHP)
+GLN = (RMX, NGG)
+NPJ = (QRV, KTB)
+PCP = (XSF, BPL)
+JTF = (LSL, BHB)
+TDV = (HBL, XNM)
+FKV = (JVF, HKK)
+GSG = (QJP, CLF)
+QNK = (XNQ, CGQ)
+RQT = (QVQ, RCH)
+XNT = (RKM, XRV)
+JMM = (RBK, JPL)
+LSL = (NGH, KCN)
+QLQ = (TLV, KDN)
+KXR = (KRH, KRH)
+QLV = (GSR, BQV)
+PMG = (LPH, XFB)
+VNF = (LVQ, HHG)
+CSS = (RKK, RQN)
+HGR = (PVX, LFX)
+QGN = (MPR, TXD)
+XNQ = (GTJ, LXQ)
+QQC = (GQC, PLL)
+CKR = (KQH, HQD)
+TLD = (JLJ, VFL)
+XSD = (TTQ, LDQ)
+FXF = (BXS, LMQ)
+ZZZ = (QBJ, MJJ)
+HPG = (GSR, BQV)
+LJC = (RNF, FNK)
+CCL = (DXF, HRM)
+FQR = (QBF, CLH)
+GHJ = (MPS, NRB)
+LLJ = (NVX, BTR)
+MCQ = (RTG, CTK)
+PLL = (DJD, FTV)
+BLD = (XGL, NDH)
+MLL = (NHV, PPJ)
+KDN = (LLS, DLN)
+KKN = (DCC, CCH)
+FHB = (TCJ, VLF)
+HCC = (RDN, TRJ)
+TGV = (TKF, CFG)
+TKB = (SVJ, KHH)
+QDN = (RXG, PFF)
+GQN = (RKT, NKK)
+FLV = (TLV, KDN)
+KTV = (LKK, VGH)
+XHQ = (JLX, SNS)
+MHN = (DHV, KMD)
+DLD = (SSQ, LDK)
+DKD = (CKR, JPC)
+SRD = (KPP, LFS)
+LVT = (PMG, NBN)
+KPP = (FLQ, XTX)
+BQV = (GLN, NQG)
+BSB = (KHR, FGL)
+HGC = (DBX, QTF)
+DSF = (RBQ, GQH)
+GRQ = (MVQ, RVP)
+JGT = (SFN, GQT)
+HDF = (SMX, HGC)
+QBF = (VKF, XHQ)
+QKM = (JTV, LPP)
+LJB = (QQC, KFK)
+NTH = (QQV, MHS)
+QTX = (FMX, PKP)
+HCQ = (FFT, CBC)
+XKJ = (DXR, PTS)
+BHH = (KPP, LFS)
+GRH = (QLQ, FLV)
+FNX = (MJX, PFZ)
+HQN = (CKS, BVB)
+SJV = (CGF, VKD)
+RDL = (QJV, MLX)
+MFR = (DMF, CFD)
+LPF = (SRD, BHH)
+HCP = (MPV, NVL)
+KNS = (VCD, LJL)
+CDX = (LLX, TNN)
+SGS = (KMC, RQK)
+HQS = (NKP, FRN)
+QVD = (VML, QHT)
+NRG = (LDS, SCH)
+BVB = (HCP, NVM)
+RBK = (QLB, RQT)
+MPV = (CGR, TSC)
+VFP = (JXP, QCM)
+QFS = (DFQ, FHB)
+FTK = (LSH, DDG)
+TJH = (KPL, KTR)
+HQF = (MQF, FTK)
+FGX = (HVP, KNS)
+DDK = (NTM, JNC)
+BJC = (SQK, RGB)
+HVP = (VCD, LJL)
+LTG = (RMV, CJC)
+BNR = (CSS, RBN)
+GQT = (LCN, DTK)
+XSF = (BGT, FCN)
+SSQ = (KTL, JMR)
+RNH = (BXH, BXH)
+FTV = (CMM, PBL)
+QRK = (TSF, QFS)
+CLR = (NFS, PGK)
+SRJ = (PFV, SHX)
+FQT = (QKT, BJB)
+FRN = (BJH, JTF)
+RCN = (NRV, CCL)
+QTM = (CKR, JPC)
+JHT = (HRC, NVR)
+KVB = (KRH, KKT)
+HJG = (GHN, GHN)
+RNF = (QFF, CKV)
+PTT = (VNT, FNX)
+GRB = (SVJ, KHH)
+TRJ = (PVJ, QKP)
+MHS = (FCV, JXD)
+VBM = (SBN, DQF)
+DLM = (VNH, SCJ)
+PPJ = (DMH, PHJ)
+QJN = (LSX, KBN)
+HXV = (SMH, BJP)
+GVL = (VMV, DKF)
+QCG = (FKV, NVD)
+FNM = (XRV, RKM)
+JQJ = (NVT, HGR)
+KVX = (GRG, PMJ)
+JLV = (SMG, RPH)
+TXD = (MFN, HQG)
+TLJ = (FHD, MHN)
+RPV = (GKH, BPT)
+CPR = (JLH, PLC)
+FLQ = (TPR, LGG)
+BTF = (HGR, NVT)
+GCH = (QPT, FDV)
+JCF = (GHM, NKS)
+CLF = (PCT, XKJ)
+RMT = (QKM, XCP)
+KPL = (DJB, VLV)
+RMV = (NMS, HCC)
+XRV = (VPH, PHH)
+HBB = (XKH, FBQ)
+PXB = (QBF, CLH)
+HMR = (PCP, LMJ)
+KCT = (PFS, PFB)
+DCC = (MBP, BJC)
+VFV = (VBD, HQS)
+DJB = (BQX, SLD)
+MFS = (VML, QHT)
+RPC = (PHR, JFD)
+RDS = (LFC, RNK)
+KMC = (RPR, NRL)
+CJD = (VJN, GKK)
+VST = (VCS, CMQ)
+VMC = (RPC, MCV)
+VJV = (XTP, DRK)
+BXH = (RXT, BLP)
+PNQ = (DSF, PSH)
+RJJ = (FXH, QLX)
+NKS = (QDQ, DPP)
+QDQ = (SJV, MRP)
+HQQ = (CJD, DVT)
+LKV = (CGQ, XNQ)
+KTL = (HFF, FPS)
+MBP = (RGB, SQK)
+MQQ = (HCQ, MDL)
+BQS = (SCJ, VNH)
+NRT = (FJD, HTS)
+HHG = (RTC, RPQ)
+VNH = (XSD, HQH)
+QTS = (QTG, MHD)
+DJQ = (NRG, QCD)
+MDX = (BPT, GKH)
+QJV = (QQP, VLJ)
+HBD = (HBB, CKC)
+GBF = (HJG, FPV)
+VDC = (JFJ, VNF)
+MPH = (PFV, SHX)
+TPR = (BXD, FVX)
+KFX = (DJT, LLJ)
+LSX = (VKN, STS)
+HJL = (KFX, BBK)
+QLT = (KGC, DMM)
+QFF = (BJM, QCG)
+DVM = (GCD, FSC)
+MHD = (JCF, JPJ)
+DPQ = (JJX, GNL)
+NMS = (TRJ, RDN)
+VLJ = (XJB, HSJ)
+JSP = (MHN, FHD)
+BTR = (GMD, TLD)
+TTD = (SPC, DFJ)
+QKT = (XPV, BVJ)
+MKK = (HCQ, MDL)
+LFC = (LSS, GQN)
+QGL = (RPG, HGJ)
+JDT = (FPN, DTC)
+NCM = (RPG, HGJ)
+LCN = (QLT, MTG)
+VGS = (VJV, SRT)
+CGF = (FXF, STT)
+KQS = (PFB, PFS)
+PFF = (DLD, MRJ)
+LSH = (QTS, VRJ)
+FGF = (MPH, SRJ)
+BJG = (TVF, BDN)
+HQR = (CXG, CPR)
+JVF = (RGM, NCG)
+SNP = (BLN, DFD)
+DQH = (GSC, CFT)
+JVA = (RMT, DPF)
+VPH = (CRN, CHT)
+DFQ = (VLF, TCJ)
+DFD = (HQR, QDF)
+NJH = (RXG, PFF)
+DTK = (QLT, MTG)
+MJJ = (DJH, RDQ)
+GGB = (CFT, GSC)
+SMH = (RHQ, RJX)
+NFS = (SNP, QLP)
+LNV = (XLR, KQF)
+LCD = (FNM, XNT)
+GQH = (JDT, JRX)
+JPJ = (GHM, NKS)
+GMD = (VFL, JLJ)
+HTS = (KXR, KVB)
+KFT = (LCD, QCL)
+SGH = (NVR, HRC)
+QKP = (MQD, MLM)
+HFF = (MGM, KSX)
+HJM = (KBN, LSX)
+MJX = (VHC, PXF)
+TSF = (FHB, DFQ)
+MSH = (GFM, JHC)
+VBG = (HJM, QJN)
+CKS = (HCP, NVM)
+DQF = (LJC, KXM)
+FVP = (FJD, HTS)
+DPP = (SJV, MRP)
+FKM = (CSS, RBN)
+VCD = (FCH, GBX)
+DJV = (VMC, HVC)
+RKM = (VPH, PHH)
+TMP = (KHR, FGL)
+BVC = (TLJ, JSP)
+SRV = (HQS, VBD)
+FCN = (DHM, VDX)
+DJH = (FBG, MCQ)
+NGG = (RPL, DFV)
+SRT = (XTP, DRK)
+RMN = (QTD, JGS)
+MLH = (MQJ, VDR)
+KVL = (VFV, SRV)
+VDX = (FRV, HXV)
+RXT = (LJB, XVK)
+LSS = (RKT, NKK)
+LNN = (KTB, QRV)
+BCC = (CHL, QXP)
+GHN = (XBS, XBS)
+FCK = (FKM, BNR)
+QLP = (BLN, DFD)
+BDN = (JMC, MTV)
+MLX = (VLJ, QQP)
+RDH = (VNT, VNT)
+DFV = (JKJ, KDX)
+DXG = (JLV, MVL)
+TCF = (DSF, PSH)
+JJX = (MKM, TJJ)
+VFL = (GGB, DQH)
+VLV = (SLD, BQX)
+RBQ = (JDT, JRX)
+JXP = (QXB, QVT)
+PFV = (STX, XHF)
+BLN = (QDF, HQR)
+FVX = (QKQ, MLL)
+QTP = (DJV, GMN)
+JLP = (NJF, MFR)
+CXG = (PLC, JLH)
+VKF = (JLX, SNS)
+QQT = (GMN, DJV)
+KDX = (MHH, PMX)
+FJD = (KXR, KXR)
+XJB = (PHB, JTH)
+VMV = (RCN, XJS)
+MKM = (HPG, QLV)
+SQK = (GBF, JCS)
+PMT = (SGQ, DXG)
+LXQ = (GRB, TKB)
+RKK = (SSK, SSK)
+QXA = (VHC, PXF)
+QDP = (QTD, JGS)
+VQC = (KQF, XLR)
+QKQ = (PPJ, NHV)
+TXM = (JLP, JCJ)
+SPC = (LRR, SXC)
+BHG = (KFL, BCC)
+QBK = (VNF, JFJ)
+BPB = (LBJ, JGT)
+RNK = (LSS, GQN)
+BJP = (RHQ, RJX)
+VNT = (MJX, MJX)
+QLX = (GCH, KBD)
+DXF = (RNH, RNH)
+DLS = (VFV, SRV)
+SXR = (TLJ, JSP)
+SGQ = (JLV, MVL)
+NRL = (XPP, XGM)
+JFD = (LVD, LTQ)
+XNM = (JXF, LVT)
+PHH = (CHT, CRN)
+QTD = (CTJ, LPF)
+FCV = (GTC, CKJ)
+QRG = (JLP, JCJ)
+DKS = (KPL, KTR)
+TTQ = (BFV, LVR)
+RPR = (XGM, XPP)
+DVS = (FTH, FFG)
+RRH = (NJH, QDN)
+KTR = (DJB, VLV)
+KQM = (BJV, MND)
+GKS = (BXH, QCZ)
+FSV = (MPS, NRB)
+QXB = (DJQ, JCK)
+FHX = (QFS, TSF)
+FGL = (QGL, NCM)
+BHB = (KCN, NGH)
+KNA = (KTV, KPG)
+NBN = (LPH, XFB)
+NVM = (NVL, MPV)
+LVR = (CNB, FGX)
+QCL = (FNM, XNT)
+XRR = (MTB, HMR)
+LLS = (TXM, QRG)
+AAA = (MJJ, QBJ)
+RPL = (JKJ, KDX)
+QCM = (QVT, QXB)
+QVF = (BQS, DLM)
+LMQ = (LMK, BVF)
+BLS = (CQK, GTG)
+JMC = (PLP, HJL)
+KXM = (RNF, FNK)
+NDH = (FHJ, GML)
+SNS = (VJK, FMJ)
+KFL = (QXP, CHL)
+FSD = (XNH, MJF)
+DTC = (GLD, TCK)
+MRP = (CGF, VKD)
+JHX = (CJD, DVT)
+KPG = (LKK, VGH)
+DJT = (NVX, BTR)
+MQD = (FQT, KDB)
+CKJ = (BLS, CGP)
+JXD = (GTC, CKJ)
+NVL = (CGR, TSC)
+PKV = (DBR, PGB)
+JPL = (QLB, RQT)
+TSC = (FMS, KRS)
+XGL = (GML, FHJ)
+DJD = (PBL, CMM)
+FSC = (BFG, NTH)
+DMH = (PBN, HND)
+KRS = (FQR, PXB)
+LLM = (GMX, VLX)
+FJB = (XQV, KFT)
+KRH = (QHR, QHR)
+RDQ = (MCQ, FBG)
+GLD = (VST, JPF)
+RVP = (HBD, RBC)
+DHV = (RJJ, KFV)
+FMX = (RFL, GSG)
+SMX = (DBX, QTF)
+LPP = (FSD, PHM)
+TDG = (MKK, MQQ)
+HPL = (BDN, TVF)
+MGM = (RDH, RDH)
+FHJ = (XFJ, GVL)
+TQB = (VFP, VGF)
+JLJ = (DQH, GGB)
+FMS = (FQR, PXB)
+HQD = (BPR, SJK)
+VXR = (XQX, VBG)
+GML = (XFJ, GVL)
+GCS = (RKJ, CSC)
+CTJ = (SRD, BHH)
+CLH = (XHQ, VKF)
+HND = (RDL, PXS)
+QPT = (RRH, CKQ)
+NVD = (HKK, JVF)
+XGM = (VFK, MLH)
+GMN = (HVC, VMC)
+QDF = (CXG, CPR)
+TCK = (JPF, VST)
+BJH = (LSL, BHB)
+JNC = (BPB, SLZ)
+GSC = (QVF, MJM)
+XHG = (SRJ, MPH)
+CGQ = (GTJ, LXQ)
+CHL = (TGV, HPX)
+MRJ = (LDK, SSQ)
+GKH = (VQC, LNV)
+MLM = (FQT, KDB)
+BPT = (LNV, VQC)
+BXT = (TKD, ZZZ)
+PMP = (NHP, KJP)
+PLC = (XLV, CKG)
+FXA = (LBJ, JGT)
+PKP = (RFL, GSG)
+BQX = (MSH, NSN)
+LBJ = (SFN, GQT)
+KMD = (KFV, RJJ)
+PVJ = (MQD, MLM)
+LDQ = (LVR, BFV)
+SLS = (PGB, DBR)
+VTP = (HQQ, JHX)
+MPS = (QTX, DGF)
+VRJ = (QTG, MHD)
+HBH = (HNG, FKF)
+RTC = (RMD, FJB)
+PHB = (LPD, LPD)
+CMM = (DMS, KFB)
+QVR = (MKK, MQQ)
+XFJ = (DKF, VMV)
+TLV = (DLN, LLS)
+QRV = (SCL, BSJ)
+MFN = (GHK, RRL)
+NVT = (LFX, PVX)
+FVL = (HMR, MTB)
+VCS = (TQB, BBM)
+XHF = (QBK, VDC)
+JTV = (FSD, PHM)
+VML = (TTD, LBH)
+SCL = (DKS, TJH)
+VHC = (QXM, HDF)
+LPV = (GMX, VLX)
+CFG = (BTF, JQJ)
+MCV = (PHR, JFD)
+LDS = (FGF, XHG)
+VGF = (QCM, JXP)
+BVF = (QQT, QTP)
+VKN = (TMP, BSB)
+VJK = (KQM, DHQ)
+CTK = (GSF, HQN)
+PHM = (MJF, XNH)
+PVX = (MHK, SXL)
+JPC = (KQH, HQD)
+JGS = (CTJ, LPF)
+XNV = (CLR, BLB)
+PTS = (KCT, KQS)
+BXS = (BVF, LMK)
+BJB = (XPV, BVJ)
+MHK = (VTP, KKX)
+CJC = (NMS, HCC)
+RKT = (PMT, FCX)
+BFG = (QQV, MHS)
+LPH = (HDD, DVM)
+GSR = (GLN, NQG)
+MHH = (VGS, TRH)
+HMT = (BLB, CLR)
+JCJ = (NJF, MFR)
+MDK = (RPV, MDX)
+LRR = (DPQ, XTB)
+RKJ = (PDP, BLD)
+MJF = (RXX, SGS)
+NCG = (NRT, FVP)
+QQV = (JXD, FCV)
+MJQ = (BCC, KFL)
+TKD = (MJJ, QBJ)
+MND = (MDK, KBG)
+RXG = (MRJ, DLD)
+BGT = (DHM, VDX)
+XCP = (LPP, JTV)
+TRS = (QPH, GCS)
+FPS = (MGM, KSX)
+MVL = (SMG, RPH)
+BJM = (NVD, FKV)
+BSJ = (TJH, DKS)
+MTV = (PLP, HJL)
+GQC = (FTV, DJD)
+CQL = (FTK, MQF)
+VQM = (RMV, CJC)
+SLZ = (JGT, LBJ)
+HVC = (MCV, RPC)
+LFX = (MHK, SXL)
+BJQ = (LFC, RNK)
+BFV = (FGX, CNB)
+DRK = (HMT, XNV)
+VBD = (NKP, FRN)
+KBN = (STS, VKN)
+XQX = (HJM, QJN)
+MPR = (HQG, MFN)
+KFB = (MFS, QVD)
+GHM = (QDQ, DPP)
+KBD = (QPT, FDV)
+MVH = (FVL, XRR)
+PGB = (RVG, TRS)
+RGM = (NRT, FVP)
+KKT = (QHR, GNZ)
+TCJ = (RDS, BJQ)
+MVQ = (HBD, RBC)
+CKC = (XKH, FBQ)
+SHX = (XHF, STX)
+NVR = (RFF, GRH)
+DKF = (RCN, XJS)
+KTB = (BSJ, SCL)
+HSJ = (PHB, JTH)
+RJH = (DCC, CCH)
+FNK = (QFF, CKV)
+XNH = (SGS, RXX)
+NRV = (DXF, DXF)
+HRM = (RNH, GKS)
+LJL = (GBX, FCH)
+RDN = (PVJ, QKP)
+JXM = (MVQ, RVP)
+XLR = (HBH, MGJ)
+QXP = (HPX, TGV)
+HQH = (TTQ, LDQ)
+HGJ = (FCK, HGS)
+JTH = (LPD, DDK)
+NKK = (FCX, PMT)
+DHQ = (MND, BJV)
+RFF = (FLV, QLQ)
+RGB = (GBF, JCS)
+RMX = (DFV, RPL)
+VXF = (XRR, FVL)
+SMG = (RSN, VBM)
+KBG = (RPV, MDX)
+QCZ = (BLP, RXT)
+CQK = (BJG, HPL)
+FDV = (RRH, CKQ)
+CKQ = (QDN, NJH)
+RRL = (JMM, VBN)
+RVG = (QPH, GCS)
+FTT = (GRG, PMJ)
+FHD = (KMD, DHV)
+GFM = (MRG, CDX)
+FFG = (QRK, FHX)
+RTG = (GSF, HQN)
+PXS = (MLX, QJV)
+MQJ = (JHT, SGH)
+KSX = (RDH, PTT)
+VXP = (VBG, XQX)
+PMX = (TRH, VGS)
+BPR = (GRQ, JXM)
+VKD = (STT, FXF)
+SXL = (KKX, VTP)
+HDD = (GCD, FSC)
+GTJ = (GRB, TKB)
+CHT = (VXP, VXR)
+RBC = (CKC, HBB)
+XBS = (TKD, TKD)
+KHH = (CQL, HQF)
+XTX = (TPR, LGG)
+LKK = (LLM, LPV)
+VFK = (VDR, MQJ)
+JLX = (VJK, FMJ)
+FRV = (SMH, BJP)
+GTC = (CGP, BLS)
+PHR = (LTQ, LVD)
+GCD = (BFG, NTH)
+SBN = (KXM, LJC)
+STX = (QBK, VDC)
+FBG = (RTG, CTK)
+CKV = (BJM, QCG)
+DPF = (XCP, QKM)
+FKF = (MVH, VXF)
+BLB = (PGK, NFS)
+XPV = (MJQ, BHG)
+GMX = (FTT, KVX)
+LBH = (DFJ, SPC)
+JHC = (CDX, MRG)
+GNL = (TJJ, MKM)
+DSM = (FTH, FFG)
+FFT = (QGN, LRB)
+GRG = (NPJ, LNN)
+JFJ = (HHG, LVQ)
+CGR = (FMS, KRS)
+LFS = (XTX, FLQ)
+DMF = (TCF, PNQ)
+LVQ = (RTC, RPQ)
+DFJ = (SXC, LRR)
+VLF = (RDS, BJQ)
+LMJ = (BPL, XSF)
+BVJ = (BHG, MJQ)
+NRB = (QTX, DGF)
+GKK = (RMN, QDP)
+CFD = (PNQ, TCF)
+GBX = (DSM, DVS)
+NTM = (BPB, BPB)
+XKH = (GHJ, FSV)
+LGG = (BXD, FVX)
+DBR = (RVG, TRS)
+GTG = (BJG, HPL)
+HKK = (NCG, RGM)
+CKG = (LKV, QNK)
+FKG = (RMT, DPF)
+QVQ = (DKD, QTM)
+LDK = (KTL, JMR)
+PHJ = (PBN, HND)
+PFZ = (PXF, VHC)
+VLX = (KVX, FTT)
+KQF = (HBH, MGJ)
+RQN = (SSK, PMP)
+CMQ = (TQB, BBM)
+NHP = (FKG, FKG)
+DVT = (GKK, VJN)
+RPG = (FCK, HGS)
+RBN = (RKK, RQN)
+PBN = (RDL, PXS)
+RCH = (QTM, DKD)
+CRN = (VXP, VXR)
+TNN = (KBF, TDV)
+RFL = (QJP, CLF)
+NJF = (DMF, CFD)
+NQG = (RMX, NGG)
+VDR = (JHT, SGH)
+FPV = (GHN, BRB)
+PBL = (DMS, KFB)
+XTB = (JJX, GNL)
+HGS = (FKM, BNR)
+CCH = (BJC, MBP)
+STT = (LMQ, BXS)
+LTQ = (SLS, PKV)
+SFN = (LCN, DTK)
+NGH = (QVR, TDG)
+RQK = (RPR, NRL)
+PDP = (NDH, XGL)
+FCH = (DSM, DVS)
+QCD = (SCH, LDS)
+TKF = (BTF, JQJ)
+BPL = (BGT, FCN)
+SVJ = (CQL, HQF)
+QTG = (JPJ, JCF)
+NSN = (GFM, JHC)
+JCS = (HJG, FPV)
+HRC = (GRH, RFF)
+VGH = (LLM, LPV)
+BRB = (XBS, BXT)
+JMR = (HFF, FPS)
+VJN = (RMN, QDP)
+HPX = (TKF, CFG)
+CFT = (QVF, MJM)
+DBX = (KVL, DLS)
+NHV = (PHJ, DMH)
+FTH = (QRK, FHX)
+XFB = (DVM, HDD)
+XPP = (MLH, VFK)
+CGP = (CQK, GTG)
+MDL = (FFT, CBC)
+GNZ = (KPG, KTV)
+BJV = (KBG, MDK)
+SCH = (FGF, XHG)
+RXX = (KMC, RQK)
+HQG = (GHK, RRL)
+KKX = (JHX, HQQ)
+LVD = (SLS, PKV)
+QQP = (XJB, HSJ)
+MTB = (LMJ, PCP)
+FMJ = (KQM, DHQ)
diff --git a/data/09.in b/data/09.in
new file mode 100644
index 0000000..4fb3525
--- /dev/null
+++ b/data/09.in
@@ -0,0 +1,200 @@
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diff --git a/data/12.in b/data/12.in
new file mode 100644
index 0000000..c18164d
--- /dev/null
+++ b/data/12.in
@@ -0,0 +1,1000 @@
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diff --git a/data/17.in b/data/17.in
new file mode 100644
index 0000000..0820b5c
--- /dev/null
+++ b/data/17.in
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diff --git a/data/19.in b/data/19.in
new file mode 100644
index 0000000..931cf9c
--- /dev/null
+++ b/data/19.in
@@ -0,0 +1,777 @@
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+nsz{s<2211:jn,x<2387:nb,R}
+tsj{x<3454:A,a<3740:R,x>3695:R,R}
+bxk{x<487:A,m<3001:jzs,m>3535:R,zgt}
+qq{a>2875:A,s<1314:A,m<982:A,R}
+ksq{s<1649:R,x>2393:R,R}
+hdz{x>3225:R,s>2321:A,R}
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+kf{a>748:A,A}
+vb{m>3549:gvm,m>3403:R,A}
+nx{s>486:R,A}
+vtk{x<3172:tr,a>3353:nz,jr}
+mlt{a>2987:A,s>286:A,A}
+mv{s>2214:A,s<1986:A,s<2104:R,A}
+fs{m<551:nll,hrj}
+nh{s<3247:R,m>693:A,a>2956:A,R}
+vpn{m<1447:R,gf}
+bpd{a<3269:A,A}
+mq{m<404:A,x>243:A,A}
+jjx{x>3138:A,a>670:R,s>3088:R,A}
+pn{s<1297:ds,m>1065:bj,bmf}
+xp{x<1214:A,a<3436:R,m>866:R,A}
+mpt{s>266:R,a>2276:A,A}
+vk{m<1307:hd,tsj}
+ql{a<1594:A,A}
+bsb{m>2463:lks,x>626:tz,kk}
+fn{a>1154:A,m<2652:R,s<1641:vtg,pzz}
+knc{x<883:rfg,s<731:lv,s<1274:jkh,vdh}
+kc{x<1160:jt,a>2721:qzg,m>1522:lrf,dg}
+px{s<239:R,s>302:A,R}
+bzf{m>3078:tln,s>575:gp,ml}
+qfg{x>1167:R,x<1086:R,a>705:R,A}
+ffn{a<1088:mbb,m<520:sb,vf}
+jhg{m<3331:R,R}
+llm{s>2346:R,a>2587:A,R}
+xdr{s>3119:jxb,x>714:R,m<1724:zxl,hp}
+cf{x<369:A,x<488:R,a<1340:A,A}
+pvt{s>301:A,x<1488:A,a>3250:A,R}
+dpm{x<3365:A,m>3696:A,R}
+dhk{a>611:R,m>497:A,a<349:A,R}
+dg{s>517:R,m<1250:fz,R}
+ph{x<3427:R,a<2511:R,A}
+hsx{x<1317:R,a<970:bzc,a<1412:cp,A}
+mzb{m<2475:A,a<3151:R,s<101:A,A}
+jtj{m<657:R,m<1047:R,s<1082:R,R}
+xv{x>1004:A,s<1572:R,R}
+cx{a<2527:A,A}
+zn{m<2693:A,s>2559:R,m>3231:A,A}
+nll{m<187:R,a>3715:A,R}
+dh{x<1366:A,fq}
+dr{a<3764:hf,a<3914:A,m<3290:A,R}
+qz{s<257:R,fsp}
+xfl{x>3188:A,x<2536:R,s<2342:A,A}
+cz{m>3153:R,x<1136:R,x<1184:A,A}
+qcf{s>2754:kmb,R}
+fm{m<1085:R,a>2556:A,a>2420:R,R}
+ld{s>737:A,s>489:R,a<88:A,R}
+rfg{s<1129:ft,m>1514:mk,m>934:jpb,ggs}
+lzh{m<1134:R,m<1308:R,A}
+ckk{s>1464:lzh,s>1179:qq,R}
+bvc{x>510:kt,m>1338:hh,pmm}
+xtr{x>1686:A,R}
+gxb{s<352:R,s<392:A,x>2751:A,R}
+npd{a<3087:A,m>1379:vg,R}
+hch{a>2219:R,A}
+nj{m<2605:R,s<2930:R,R}
+cvj{x<1520:R,qtm}
+cgx{a<3678:R,s<2581:R,R}
+tm{x>2596:A,A}
+qtm{s>1379:A,a<2574:R,R}
+ftt{s<2273:R,s>3405:A,m<609:R,A}
+gqk{m<2274:R,a>3345:A,a<3279:A,R}
+xqn{m<2098:R,a<1184:R,A}
+qpm{x<2347:rff,x<2776:A,x>2977:A,ntz}
+hvj{x<3486:R,A}
+tpb{m<2448:lh,rjg}
+shq{m>671:R,s>206:A,R}
+htg{a>904:A,x>231:R,A}
+jq{s<2890:dn,R}
+gf{a<1251:A,A}
+vl{m>913:ccb,a<1148:tb,s>2525:kbs,qtz}
+xhl{s>399:R,a>2578:zxp,A}
+ntz{m<273:A,R}
+ntb{m<3543:qf,m<3783:lss,jj}
+thm{a>1424:R,A}
+km{m>3338:R,m>2932:A,x<3299:R,A}
+fh{s>1157:xq,vk}
+ljt{a>2529:R,m<1762:R,A}
+hgv{s<1087:R,m<1627:A,x<1370:A,A}
+brj{a>3113:gdz,a<2926:gkc,a<3040:zz,khd}
+nz{x>3516:R,x<3380:A,A}
+nvx{a>3182:R,x<3714:R,x>3816:A,R}
+fx{a>3193:A,nhk}
+spv{a>2824:vbl,m>2404:vtb,kqz}
+zpn{s>2774:nj,m<2788:jmx,hvj}
+cnx{s<1825:R,A}
+jkl{a<2564:R,A}
+lhf{s>1439:A,s<718:A,m<3252:A,A}
+rm{x<225:A,A}
+jxz{a<2321:A,a>2367:A,m>185:A,R}
+hzq{a>651:R,x>2192:A,a>607:R,A}
+jhv{a>3199:knc,s>776:pn,m>1007:kc,bx}
+svj{a>3616:R,m>3421:R,m>2865:A,R}
+vcg{s>2903:R,R}
+vhm{m>1914:R,m<1754:R,x>1550:A,R}
+ccb{s>1843:qt,bvh}
+qr{x>2395:sv,A}
+tlg{m<1031:A,x>2590:xfh,zp}
+pt{s>435:A,a<2696:gg,s>170:mlt,xkz}
+rj{x>1493:A,m<523:R,s>2867:A,R}
+pr{a>2732:A,m<2650:A,A}
+hzp{a>1120:kvf,m>3388:mf,hv}
+btf{s<3748:xxc,A}
+tr{m>717:R,A}
+rv{a>672:R,R}
+qg{s<2427:R,m<319:R,R}
+lk{s<3170:A,A}
+ksr{m>3137:gs,a<3314:hbg,s<1465:R,zk}
+dbs{m>720:hk,a>2451:mvg,a<2212:kz,frl}
+zdx{x<3645:R,s>849:A,A}
+gvv{s>3441:R,A}
+jlj{x>3003:cl,mcj}
+vtb{s<2272:xgh,s>3350:ffz,vpj}
+bdt{x<2027:px,x<2238:qh,R}
+hbg{a<2847:R,A}
+xd{x>2897:rd,a<3376:qr,nsz}
+hb{m<77:R,a<1618:A,s>1205:nns,A}
+lzj{m>2039:R,A}
+ml{a>3118:R,s>304:R,zkv}
+mt{s>2057:A,x>3358:npn,xzh}
+htv{x>3422:A,a<1058:jjx,s>3318:R,mb}
+lrm{x<2442:jxt,s>1388:hcm,R}
+zjc{x>1530:A,a>3635:R,R}
+kgl{x<688:fn,a<795:prh,dk}
+pcz{m>3387:A,x<2362:A,A}
+sf{a>690:A,mhf}
+gqn{a<3554:A,A}
+xfh{a>2277:A,s<2581:A,x<3067:R,A}
+nlj{m<379:R,s<2220:A,R}
+mcj{a>3825:ncb,x>2185:xjm,m>3112:R,R}
+tln{s<565:pvt,a<3200:jlq,m>3598:lsx,A}
+xns{m>2818:A,x>1648:R,m<2614:A,ht}
+mx{s<940:R,s>1425:A,m>3518:tpn,A}
+qgs{s>3234:rml,x>1876:pht,s<2763:R,tfv}
+gt{s<3681:A,a<3251:R,R}
+rcq{s>317:R,m<747:A,x>1403:R,R}
+hzc{x<3241:A,s<1489:A,jbc}
+fq{x>1398:A,s>2516:A,m>2301:R,R}
+kvf{a<1562:cf,x>248:R,s>1776:qlm,A}
+jfj{x<3469:A,a<2580:jz,s<2074:dbj,A}
+vdh{s>1624:R,m>1500:rfd,zjn}
+mg{s>1357:cn,rjl}
+qnt{s<483:R,x>3442:R,A}
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+crp{a<3714:R,vj}
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+tjq{x<2908:btn,a<2595:dpm,mzg}
+vfr{s>2143:pg,bsv}
+bm{m<1791:R,m<1877:R,A}
+kv{m>1866:jlj,m<870:fs,x<3127:vm,fh}
+jpr{x<3038:R,a>3300:A,R}
+gs{s>1177:R,R}
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+gjj{m<3399:qzj,m<3784:cdl,a>2319:btf,ptj}
+tjl{m<2439:A,m<3400:R,a<3075:A,R}
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+npt{s<2730:A,s>3447:R,a<2249:R,A}
+xh{a<750:R,x<368:R,x>484:R,A}
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+lzk{m<3217:A,s>3712:trb,m>3591:qrz,A}
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+dph{x>3090:R,a>2301:A,x<2908:R,R}
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+xkz{s<107:A,A}
+ncb{s<760:R,s>1392:A,a>3927:R,A}
+zv{s<859:R,A}
+jzs{a<2665:A,s>2889:R,s>2655:A,A}
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+sxd{x<3268:R,a<3101:A,A}
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+rvs{x<2743:jng,s<71:A,m>1651:mzb,dm}
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+vt{s>2338:R,a<1268:A,R}
+zxl{x<637:A,R}
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+jm{a<2685:xhl,rlq}
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+gxs{a<2679:ljt,x>2149:A,s>2360:R,R}
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+cl{m>2802:cd,s<810:A,rfn}
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+xs{s>3692:brf,x<1496:kq,mnl}
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+xl{x>2732:kh,s<3328:jq,hzg}
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+zgr{m<1436:A,A}
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+mrg{x<2908:A,s<1375:R,x>3291:R,R}
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+xq{x>3521:psx,klg}
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+kck{m<2847:hzq,m>3005:R,m>2951:txt,dd}
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+mm{x<427:R,R}
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+tj{x>2413:blb,A}
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+lnj{s>408:A,m<3185:A,s<382:R,A}
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+nqj{m>3601:A,s<2462:A,R}
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+jsd{x<1697:R,a<2402:ff,m<3616:R,nhz}
+rjg{x<955:zbv,x<1405:bhj,fv}
+bpt{a>2950:lrm,m>712:ckk,kft}
+rbf{s>3056:R,m>2843:A,A}
+jqn{a>2437:A,x>2389:A,x<2155:R,R}
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+bq{s<2735:R,a<1253:R,s>2952:A,A}
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+xll{m>1829:A,x<1433:A,m<1592:A,R}
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+jxt{a>3018:R,a>2989:R,x<2081:A,A}
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+pkr{m>99:A,s<992:tjp,a>2330:R,R}
+msc{m<1704:vl,m<3193:rbv,vfr}
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+mnl{a<2870:R,s<3477:A,x>1527:A,A}
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+dxt{x>1973:R,x>1653:A,m<2147:R,A}
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+tb{x>3001:ncx,dhk}
+hpr{s>740:R,A}
+vg{m>1757:A,A}
+zk{x>699:A,a>3640:A,A}
+hns{x>1525:A,a<3550:R,a<3709:R,A}
+in{a<1943:sg,x<1758:tpb,spv}
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+nhf{x<1660:A,x<1701:A,a>3374:A,R}
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+mkk{s<1676:tqm,x>2973:mt,hpn}
+hz{a>2110:A,x>3216:R,a>2048:R,A}
+ggs{s<1546:R,x>545:R,a>3613:A,R}
+rgg{m>1130:A,R}
+gdz{a<3255:A,a>3354:R,x<2961:ksq,ncv}
+bmf{s>1655:R,a>2724:cgc,s>1420:xb,R}
+khx{a>3552:R,x<1651:R,A}
+qh{s>220:R,a<3157:R,R}
+br{m<2805:pr,a>2750:cj,R}
+jbc{a<2031:R,a<2059:A,m>600:R,R}
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diff --git a/data/20.in b/data/20.in
new file mode 100644
index 0000000..410063f
--- /dev/null
+++ b/data/20.in
@@ -0,0 +1,58 @@
+%fg -> nt, gt
+&zp -> rx
+%fh -> nt, xz
+%pj -> zj, zq
+%jc -> nt, nk
+%mr -> vv, pz
+%cl -> fp, zq
+%xb -> bl, vv
+%nc -> zq
+%mg -> vn
+%zj -> cf
+&sb -> zp
+%ht -> pp
+%gt -> jc
+%rq -> ft
+&nt -> rq, fg, ft, nd, gt, xz
+%ps -> xm
+%fs -> ff
+%nb -> dv
+%qd -> xb
+%kg -> mr, vv
+%dv -> vv, hr
+%rm -> zq, fs
+%nk -> rq, nt
+%hr -> dm, vv
+%xm -> vn, ht
+%pp -> mq
+%br -> vn, jz
+%gr -> ln
+%bh -> qd, vv
+%cf -> gr, zq
+&vv -> dm, bl, sb, nb, qd, bh
+%zc -> zv
+%zv -> dc, vn
+%jz -> qs
+&nd -> zp
+%rd -> nc, zq
+&ds -> zp
+%mq -> vn, zc
+%bl -> bb
+%qn -> nt
+%pz -> vv
+%qs -> vn, ps
+%lm -> nt, qn
+%xz -> dr
+%bb -> nb, vv
+%dm -> kg
+%ft -> fh
+&vn -> br, jz, ht, ps, zc, pp, ds
+%xd -> nt, lm
+&hf -> zp
+broadcaster -> pj, fg, bh, br
+%fp -> rd, zq
+&zq -> fs, gr, ff, hf, ln, zj, pj
+%ff -> cl
+%dr -> xd, nt
+%ln -> rm
+%dc -> mg, vn
diff --git a/data/21.in b/data/21.in
new file mode 100644
index 0000000..ed8b0bd
--- /dev/null
+++ b/data/21.in
@@ -0,0 +1,131 @@
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+..............#.............#...........#...........................#....#..........#..#...#.............#....#...........#........
+.#.#.......#..#.....#..#............#...........#.........#.....#....#.........................#.............#.#...#..........#....
+.......#.....#..#..#...............#...#...................##.#..........................................##.#......................
+.............#........##.....#.............................#.........#..#.......................#.....#.........................#..
+........#..............#......#......................#..........#..............................#...........#...........#...........
+.....#.....#........#..................#....#.............#....#.........#..........................##.............................
+....................#.#.....#...#........#..............#.......#.......#..#.........................#.............#.........#.....
+...##.#....#.......#..........#.#........##..........#............#...#....#...#.............#...............#.............#.......
+...#........#.#...................##.............#.#.......#...........#..#..................................#................#....
+.........#............................................##..........#...#..#.......#..............#.....#..##...##....#..#...........
+.#.....#.............#........#.......#...........#........#.#....##............................................#..............#...
+.......#....##...#.....###.#....#..#............#...#.........................#.................#..#.#...........#.................
+.................##....#.........#............##..#..........#.........#.....##.##............#...#.......#.......#......#.#.......
+..##..............#..#..#...#.......#.......#...#..........#..........#.......##....#..........##............#.#....#....#..#......
+........#...................#.#..###..............#...#.#.#.#.....#.....##..#...###..............#.......#..........#.....#........
+..........##.............#......#.#....................#.#...................#..........#.............#.#....................#..##.
+.#............................#..........#.#...#.........##..#...........#.#.....#...............#.........#.....#..#..............
+....................#....#...##..........................#...#....#.#.......#.#...........................#...................#..#.
+..........##......###....###.#............#.................................#..#...........#.......#..#.........................#..
+..#.........#......###..................................#..........................##.#.#..................#.........#.##..#.#.....
+.....#...................#...#...........#..#......#...................#...#...........#...#.........#...............#.............
+........#.#.#.....................................#.#.........##......#.##.....#.#...#...................#.....................#...
+..###..#......#.#.#.#................#.......#.#.....................#.#..#.#...............#....................#........#.##..#..
+.#........#......#.##.....#...........#.............#....#...........#................................................#............
+....#.........#..#................................#...............................#............................#...................
+....#...#....#..#......#.........#..........#.......#.......#..........#.........#.......#.....#.............#......#...#..........
+.....#..#......................................................#...#.........#................##...........#...........#..###......
+...##....#...........#..........#.........#..........#..........#....##.............#....................................#......#..
+....#........#.................#...........#..........#...##...................#....##...#.....#..#..............#..#..#....#......
+...#.#............#.#.......................................#..#..#..................................#...............#.#.#.........
+....#............#...........#...#..........#..#......................#.#...#.....#....................#.......##..........#.......
+................#...................#....#....................##.........................#........................#......#.........
+..............#...............#..#.......#..#......#....#...#.................#..#....#........#..#.....#.....................#....
+.......#........................#.#....#....#..#................#....#.........#..............#........#...........#...............
+...#.......#................#.....#........#....##.................#...#...............##.......#...#....................#.........
+........#.........................#..#...##..........................##......##....#.....#.#....#..##............................#.
+..#...##................##........#.........#..#.........##................................#.............#.#.................#.....
+....#.............................#.............#...............#...........#...............#....#.....#....#.#....................
+..........##.............#......#..................#.........#......#....#.......#....#......#....#................................
+.....#.#.#........................#..#.........#.....................#..##...#.......#......#..#.....#...#..#...#..........#.......
+...................#.#..........#...............#...#.#......#....#.................#.................###.....................#....
+.....................................#.......#....#................#..........................#..........#.................##...#..
+....#................#..#......#....#..................#..........................................#....#....#......#.......#.......
+......#..........#........#...#...#..#................#.........#.........#...#.........#.#....................#..#................
+.....#................#...#.#.#....#.#............##....#...........#......##..##............#......##.......#...#...............#.
+...#..........#..........................#.................................#................#..........###...##.......#............
+...........................#..........#......#.....#...#.#....#.....##.........##.....#.......................##..#..#..........#..
+....................#......##...#.............#.....#.#....#...........#...##..#..#............#...#...............#...............
+...............#.##.....#..........#..............#......#........#...........#..#.#......................#...#..#..##.............
+...................#....##...#..#..............#....................###.....#............#.........##..#.....#.##..#...............
+............................#......#.##.....#....#..#...#..###............#.............#.....................##...........#.......
+............#.....#.#.#.........#...#........................#......#...................#...##..#.................#........#.......
+................................#.........................................#...#.......#....#.........#.........#.....#...#.........
+.................................................................S.................................................................
+................#.......#.............................#.#......#................#..#..#......#..........#.............#............
+.............##........#.......#.#............#.......#.#.......#...#.....#...........#....#..#................#...........#.......
+............................#.#....##............#.##..###..............................#....#............#..#........#............
+..................#........#.........##.....#....#...##.#......................###.....#..#........#.#.......##.......#............
+...................#...##..........#.#..#................##....................###...................#.....#........#.#..........#.
+.................##........................#....#.#..#.....##................#...........................#......#................#.
+............................#........#........#..##.....#..#.......#......#.#...#...................................#...........##.
+..............#..........#............#...#...............#.........#.#...#...##..##.....#...........#...#..........#.#............
+.#.............#...#.........#.....###.#...............................#.....#.....#............#..#.........#.#.#.................
+....#...............#..#.....#.....#.......##....#.#........#.##.............##..#.............#.#.#...........................#...
+........................#.....#..#....#......#......#..#....#...#..#..........#....#...............#.........##..#.................
+....#................#.....#.#............#..................#..#................#.........#.....#.............#...................
+.................#.......#.....##.##.....#..................#..#......#....#...............#............#.#.#....#.........#....#..
+.......#................#..#.........#......###.....#.#........#....##......#.......#..#.#.......#.#....#.#...............#........
+...#.....#.#...............#....#..............#.........#...........#............#............#..#.#..##..........................
+......#...............##.............#.#...............#....................#..#..##.#.#.................#......................#..
+..#.....##..#.............#...#.......#.......................#........#.#.#............#...................#...................#..
+........................#..#..................#..#.#.#..............................#...#...#......#....#.#........................
+...#....................#................................#...#.....#...........#........#..#........#...................##.#.....#.
+......#...##...#.................#..#..#....#.....#.....#.....#...#..................#.............................#..#......#.....
+....................................#..................#....#...#.........#....#......................#.............#....###..#....
+.##..#..#...##..........................#..#..#...........#..............#....#.........#....#....................#......##........
+.##............#.#...............##....#.....#.......#..........#......#...............#..#...#........#.................#..#......
+.#..#.##.........##.#..........#...........#...#...#.....#.#..#............##.........##...#.....................#...#........#....
+.......#....#.#.....#........#..................#.............##........#..........##.........#..............#.#..#...#.....#.#..#.
+...#..#....#........#.......................#.......#........#....#.........#..............#...#..#.#.......##...........#.#.#..#..
+................#......#......................#...#...............#.#.....#......#..........#.##.#.........#....#...#......#..#....
+..............##.#..#...............#.#...........#..#......#......#..#.#..#.................#.....................#.........#.#...
+..#................#..#..#..........#........#.#.........#....#...........#...#.......#.#.......#......................#..#......#.
+......#............#...##..........#...#..................#.....#............##............................#...#..#........#....#..
+..................#..................................###.#..........#....##......#....#.................#..........#..#............
+...#..#.......#......#........................#...#......#..................#.#.#.#.#.....#...................#..#...#......##...#.
+....................#.#......#.......#......#....#.......#.#.......#.............#...#..#.........................#................
+.........#................#.#...........##......#..#..#..................#....#......#......#.......#.#......#.........#.....#.....
+..#..........#...........#.........................#.......#..........#....#...........#.#..............................#.....##...
+.....#.#..#......#....#....#.............................##.....#...#......#..#..#...#..............#..........#.................#.
+.............##....##.......................#.#............#................#....#.......#...................#.....................
+..#.......#.........#......................................................#..#..#..............#..#.##............................
+......#.......#....#............................................#.#...................##...............##......#.......#.........#.
+..............#..#..............#...........#...............................#...................................#....#......#.#....
+.........#....#......#.....#.................#..............#.................................................#........##..........
+......#...##..............#....#.#............#..#....#...........#.........#..........................#......#.#..........##.#....
+...#....#.....#........##...#...................#.#....#...........................#...........................#..........#........
+.#..........#.#.....#............#.#................#...#.#..#...............#....#..........#.........#............#.......#.#....
+.........#......#.#.#.......#....#...#.#......................#........#..#...#...................#.......#.........#............#.
+..........................#.....#.................................#.#.....#.................................#.#...#.###....#.......
+...#.................#..#.................#..............#........#.......#.#.............#................#...#..#...........#....
+....#..#....................#...............................#.#....#...........................#..#.....##..#................##..#.
+....#...#...#..##........##......#...#......#................#..#.......................#....#........#...#.......#..........#.....
+............#.....#................#.........#.............#...#...#.#................#...........#......#..#.......#........#.#...
+......#...#...........#....#..#.#..............................#......................................................#............
+................#.....#.....#....#.......#..#...#..........#.#......................#..#...#.....#...........#.............#..#....
+..............#.....#.......#.#.............#.................#.........##.............#......#..............#.....................
+...#......#.##...............#..........#...#....#............##................#........#.#......#.#.#............................
+.#....#......................#...............###.....................#..................#..#..........#...........#.....#..........
+............#..#.......#....#...........#...##..#...........##....#.............#..#.#....#............#..#.......#.#.#.....#......
+......#.....##.##.#.....#.#...........#.#.#...................#..................#..#..#..#........#........................#.#....
+....#.........#........................#..#....##.................#............#.......#..........................##.#.....#.......
+..#..#....................#..........#..........#...........................#..............#....................#..................
+..............#...#...............#...........##................#..........#........#.#....#......##.......#....#.......#...##.....
+......#...............#........#...#...........#.....#......................#............#.............#..........#...........##...
+..#..........#.#.#........#.#..#.#..##...........#.........................#........#.#....#.#........#.........#........#......##.
+..........#.#.#...#...#.#...............................#..............#....#......##..........#.#..........#...#....#.............
+.....................#............#......#.#..#....#..#..#..............#....#.#........................##......#............#.....
+...................................................................................................................................
diff --git a/flake.nix b/flake.nix
index f95f7ba..036871d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -20,6 +20,8 @@
         devShells = forAllSystems (pkgs: with pkgs; {
           default = mkShell {
             nativeBuildInputs = [ rustc cargo ];
+            buildInputs = [ hyperfine ];
+            RUST_SRC_PATH = "${rustPlatform.rustLibSrc}";
           };
         });
 
diff --git a/src/bin/day05.rs b/src/bin/day05.rs
index 24e0c87..a1afdf5 100644
--- a/src/bin/day05.rs
+++ b/src/bin/day05.rs
@@ -69,7 +69,7 @@ impl Entry {
 fn main() -> Result<()> {
     let filename = env::args()
         .nth(1)
-        .context("./day03 <path to puzzle input>")?;
+        .context("./day05 <path to puzzle input>")?;
     let input = fs::read_to_string(filename)?;
 
     let mut sections = input.split("\n\n");
diff --git a/src/bin/day06.rs b/src/bin/day06.rs
new file mode 100644
index 0000000..25d5ab1
--- /dev/null
+++ b/src/bin/day06.rs
@@ -0,0 +1,39 @@
+use anyhow::{Context, Result};
+use itertools::Itertools;
+
+fn win_bounds(time: u64, record: u64) -> (u64, u64) {
+    let det_sq = time * time - 4 * record;
+    let det = (det_sq as f64).sqrt();
+    let mut low = ((time as f64 - det) / 2.0).ceil() as u64;
+    low += ((time - low) * low <= record) as u64;
+    let mut high = ((time as f64 + det) / 2.0).floor() as u64;
+    high -= ((time - low) * low <= record) as u64;
+    (low, high)
+}
+
+fn main() -> Result<()> {
+    let filename = std::env::args()
+        .nth(1)
+        .context("./day06 <path to puzzle input>")?;
+    let input = std::fs::read_to_string(filename)?;
+
+    let mut nums = input.lines().map(|line| {
+        line.split_ascii_whitespace()
+            .skip(1)
+            .map(|d| d.parse().unwrap())
+            .collect::<Vec<_>>()
+    });
+
+	let (times, records) = nums.next_tuple().unwrap();
+    let races = times.iter().zip(records.iter());
+    let range = |(low, high)| high - low + 1;
+    let part1: u64 = races.map(|(&t, &r)| range(win_bounds(t, r))).product();
+
+    let concat = |v: Vec<_>| v.iter().join("").parse().unwrap();
+    let part2 = range(win_bounds(concat(times), concat(records)));
+
+    println!("1) {}", part1);
+    println!("2) {}", part2);
+
+    Ok(())
+}
diff --git a/src/bin/day07.rs b/src/bin/day07.rs
new file mode 100644
index 0000000..86829c8
--- /dev/null
+++ b/src/bin/day07.rs
@@ -0,0 +1,142 @@
+use std::env;
+use std::fs;
+
+#[derive(PartialEq, Eq, PartialOrd, Ord, Debug)]
+enum Kind {
+    HC,
+    OP,
+    TP,
+    THREE,
+    FH,
+    FOUR,
+    FIVE,
+}
+
+impl Kind {
+    fn from_sorted_frequencies(slice: &[u8]) -> Kind {
+        match slice {
+            &[5] => Kind::FIVE,
+            &[4, _] => Kind::FOUR,
+            &[3, _] => Kind::FH,
+            &[3, _, _] => Kind::THREE,
+            &[2, _, _] => Kind::TP,
+            &[2, _, _, _] => Kind::OP,
+            &[1, _, _, _, _] => Kind::HC,
+            _ => unreachable!(),
+        }
+    }
+}
+
+fn find_frequencies(hand: [u8; 5]) -> (u8, [u8; 5], [u8; 5]) {
+    let mut distinct = 0u8;
+    let mut cards = [0u8; 5];
+    let mut counts = [0u8; 5];
+
+    for c in hand {
+        let mut was_seen: bool = false;
+        for i in 0..5 {
+            if c == cards[i] {
+                counts[i] += 1;
+                was_seen = true;
+                break;
+            }
+        }
+
+        if !was_seen {
+            cards[distinct as usize] = c;
+            counts[distinct as usize] = 1;
+            distinct += 1;
+        }
+    }
+
+    (distinct, cards, counts)
+}
+
+fn kind(hand: [u8; 5]) -> Kind {
+    let (distinct, _, mut counts) = find_frequencies(hand);
+    counts.sort();
+    counts.reverse();
+    Kind::from_sorted_frequencies(&counts[..distinct as usize])
+}
+
+fn joker_kind(hand: [u8; 5], joker: u8) -> Kind {
+    let (mut distinct, cards, mut counts) = find_frequencies(hand);
+    let mut joker_count = 0;
+    for c in 0..distinct as usize {
+        if cards[c] == joker {
+            joker_count += counts[c];
+			distinct -= 1;
+            counts[c] = 0;
+			break;
+        }
+    }
+
+	distinct = distinct.max(1);
+    counts.sort();
+    counts.reverse();
+    counts[0] += joker_count;
+    Kind::from_sorted_frequencies(&counts[..distinct as usize])
+}
+
+fn solve(encoding: impl Fn(u8) -> u8, kind_eval: impl Fn([u8; 5]) -> Kind, input: &str) -> u64 {
+    let mut hand_bid_pairs: Vec<_> = input
+        .lines()
+        .map(|line| {
+            let mut hand: [u8; 5] = (&line.as_bytes()[..5]).try_into().unwrap();
+            for b in hand.iter_mut() {
+                *b = encoding(*b);
+            }
+            let kind = kind_eval(hand);
+
+            let bid = line
+                .bytes()
+                .skip(6)
+                .map(|c| (c - b'0') as u64)
+                .reduce(|a, b| a * 10 + b)
+                .unwrap();
+
+            (kind, hand, bid)
+        })
+        .collect();
+
+    hand_bid_pairs.sort();
+
+    hand_bid_pairs
+        .into_iter()
+        .zip(1..)
+        .map(|((_, _, bid), i)| bid * i)
+        .sum()
+}
+
+fn main() {
+    let filename = env::args().nth(1).unwrap();
+    let input = fs::read_to_string(filename).unwrap();
+
+    let encode_p1 = |byte| match byte {
+        b'T' => b'V',
+        b'J' => b'W',
+        b'Q' => b'X',
+        b'K' => b'Y',
+        b'A' => b'Z',
+        _ => byte,
+    };
+
+    let part1 = solve(encode_p1, kind, &input);
+
+    let encode_p2 = |byte| match byte {
+        b'T' => b'V',
+        b'J' => b'1',
+        b'Q' => b'X',
+        b'K' => b'Y',
+        b'A' => b'Z',
+        _ => byte,
+    };
+
+	let kind_eval = |hand| joker_kind(hand, encode_p2(b'J'));
+
+    let part2 = solve(encode_p2, kind_eval, &input);
+
+
+    println!("1) {}", part1);
+    println!("2) {}", part2);
+}
diff --git a/src/bin/day08.rs b/src/bin/day08.rs
new file mode 100644
index 0000000..3ae9fe0
--- /dev/null
+++ b/src/bin/day08.rs
@@ -0,0 +1,49 @@
+use gcd;
+use hashbrown::{HashMap, HashSet};
+use anyhow::{Context, Result};
+
+fn lcm(a: u64, b: u64) -> u64 {
+    (a * b) / gcd::binary_u64(a, b)
+}
+
+fn main() -> Result<()> {
+    let filename = std::env::args()
+        .nth(1)
+        .context("./day08 <path to puzle input>")?;
+    let input = std::fs::read_to_string(filename)?;
+    let mut lines = input.lines().map(|line| line.as_bytes());
+    let instructions = lines.next().unwrap();
+    let connections: Vec<_> = lines.skip(1).collect();
+    let sources = connections.iter().map(|c| &c[..3]);
+
+    let name_ids: HashMap<_, _> = sources.clone().zip(0..).collect();
+    let id = |name: &[u8]| name_ids[name];
+    let mut neighbours = vec![(0u32, 0u32); connections.len()];
+    for (from_id, conn) in connections.iter().enumerate() {
+        neighbours[from_id] = (id(&conn[7..10]), id(&conn[12..15]));
+    }
+
+    let cycle_len = |start: &[u8], ends: &HashSet<_>| -> u64 {
+        let mut step_count = 0;
+        let mut pos = id(start);
+        let mut plan = instructions.iter().cycle();
+
+        while !ends.contains(&pos) {
+            let (to_l, to_r) = neighbours[pos as usize];
+            pos = if plan.next().unwrap() == &b'L' { to_l } else { to_r };
+            step_count += 1;
+        }
+
+        step_count
+    };
+
+    let ends = sources.clone().filter(|s| s[2] == b'Z').map(id).collect();
+    let part1 = cycle_len("AAA".as_bytes(), &ends);
+    let starts = sources.filter(|s| s[2] == b'A');
+    let part2 = starts.map(|pos| cycle_len(pos, &ends)).reduce(lcm).unwrap();
+
+    println!("1) {}", part1);
+    println!("2) {}", part2);
+
+    Ok(())
+}
diff --git a/src/bin/day09.rs b/src/bin/day09.rs
new file mode 100644
index 0000000..b206b7e
--- /dev/null
+++ b/src/bin/day09.rs
@@ -0,0 +1,48 @@
+use anyhow::{Context, Result};
+
+fn extrapolate(sequence: &mut Vec<i64>) -> Option<(i64, i64)> {
+    let diff = |seq: &mut Vec<i64>| {
+        (0..seq.len() - 1).for_each(|i| seq[i] = seq[i + 1] - seq[i]);
+        seq.pop();
+    };
+
+    let mut fwd = 0;
+    let mut bwd = 0;
+    let mut f = 1;
+
+    while sequence.len() > 1 {
+        fwd += sequence[sequence.len() - 1];
+        bwd += f * sequence[0];
+        diff(sequence);
+        f *= -1;
+
+        if sequence.iter().all(|&num| num == 0) {
+            return Some((bwd, fwd));
+        }
+    }
+
+    None
+}
+
+fn main() -> Result<()> {
+    let filename = std::env::args()
+        .nth(1)
+        .context("./day09 <path to puzzle input>")?;
+    let input = std::fs::read_to_string(filename)?;
+
+    let mut part1 = 0;
+    let mut part2 = 0;
+
+    for line in input.lines() {
+        let parse_i64 = |str: &str| str.parse::<i64>().unwrap();
+        let mut initial: Vec<i64> = line.split_ascii_whitespace().map(parse_i64).collect();
+        let (p2, p1) = extrapolate(&mut initial).context("malformed input")?;
+        part1 += p1;
+        part2 += p2;
+    }
+
+    println!("1) {}", part1);
+    println!("2) {}", part2);
+
+    Ok(())
+}
diff --git a/src/bin/day10.rs b/src/bin/day10.rs
new file mode 100644
index 0000000..0f5cca1
--- /dev/null
+++ b/src/bin/day10.rs
@@ -0,0 +1,184 @@
+use std::env;
+use std::fs;
+
+use anyhow::{anyhow, Context, Result};
+
+#[derive(PartialEq, Eq, Copy, Clone, PartialOrd, Ord, Debug)]
+struct Point {
+    x: usize,
+    y: usize,
+}
+
+impl<T> From<(T, T)> for Point
+where
+    T: Into<usize>,
+{
+    fn from(p: (T, T)) -> Self {
+        return Point {
+            x: p.0.into(),
+            y: p.1.into(),
+        };
+    }
+}
+
+impl Point {
+    #[rustfmt::skip]
+    fn walk(&self, d: Dir) -> Self {
+        match d {
+            Dir::U => Self { x: self.x - 1, y: self.y },
+            Dir::D => Self { x: self.x + 1, y: self.y },
+            Dir::L => Self { x: self.x, y: self.y - 1 },
+            Dir::R => Self { x: self.x, y: self.y + 1 },
+        }
+    }
+}
+
+#[derive(PartialEq, Eq, Copy, Clone, Debug)]
+enum Dir {
+    U,
+    D,
+    L,
+    R,
+}
+
+impl Dir {
+    fn invert(&self) -> Dir {
+        match self {
+            Dir::U => Dir::D,
+            Dir::D => Dir::U,
+            Dir::L => Dir::R,
+            Dir::R => Dir::L,
+        }
+    }
+}
+
+struct Pipe {
+    end1: Dir,
+    end2: Dir,
+}
+
+impl TryFrom<u8> for Pipe {
+    type Error = anyhow::Error;
+
+    #[rustfmt::skip]
+    fn try_from(byte: u8) -> Result<Self, Self::Error> {
+        match byte {
+            b'|' => Ok(Pipe { end1: Dir::D, end2: Dir::U }),
+            b'-' => Ok(Pipe { end1: Dir::L, end2: Dir::R }),
+            b'F' => Ok(Pipe { end1: Dir::D, end2: Dir::R }),
+            b'7' => Ok(Pipe { end1: Dir::D, end2: Dir::L }),
+            b'J' => Ok(Pipe { end1: Dir::U, end2: Dir::L }),
+            b'L' => Ok(Pipe { end1: Dir::U, end2: Dir::R }),
+            _ => Err(anyhow!("{} ({}) is not a pipe,", byte as char, byte)),
+        }
+    }
+}
+
+impl Pipe {
+    fn other_end(&self, from: &Dir) -> Option<Dir> {
+        if *from == self.end1 {
+            Some(self.end2)
+        } else if *from == self.end2 {
+            Some(self.end1)
+        } else {
+            None
+        }
+    }
+}
+
+struct Grid<T> {
+    grid: Vec<T>,
+    width: usize,
+}
+
+impl<T> std::ops::Index<Point> for Grid<T> {
+    type Output = T;
+
+    fn index(&self, p: Point) -> &T {
+        &self.grid[p.x * self.width + p.y]
+    }
+}
+
+impl<T> std::ops::IndexMut<Point> for Grid<T> {
+    fn index_mut(&mut self, p: Point) -> &mut T {
+        &mut self.grid[p.x * self.width + p.y]
+    }
+}
+
+fn main() -> Result<()> {
+    let filename = env::args()
+        .nth(1)
+        .context("./day10 <path to puzzle input>")?;
+    let input = fs::read_to_string(filename)?;
+
+    let width = input.lines().next().context("bad input")?.trim().len();
+    let grid: Vec<_> = input.lines().flat_map(|line| line.trim().bytes()).collect();
+    let height = grid.len() / width;
+    let grid = Grid { grid, width };
+
+    let mut all_points = (0..height).flat_map(|x| (0..width).map(move |y| (x, y).into()));
+    let start: Point = all_points
+        .find(|point: &Point| grid[point.clone()] == b'S')
+        .context("start not found")?;
+
+    let mut start_directions = Vec::new();
+    for dir in [Dir::U, Dir::D, Dir::L, Dir::R] {
+        let neighbour = start.walk(dir);
+        let byte = grid[neighbour];
+
+        if byte != b'.' {
+            let pipe = Pipe::try_from(byte)?;
+
+            if pipe.end1 == dir.invert() || pipe.end2 == dir.invert() {
+                start_directions.push(dir);
+            }
+        }
+    }
+
+    assert_eq!(start_directions.len(), 2);
+
+    let mut on_loop = Grid {
+        grid: vec![false; height * width],
+        width,
+    };
+
+    let end = start.walk(start_directions[0]);
+
+    on_loop[end] = true;
+    on_loop[start] = true;
+
+    let mut loop_length = 2;
+    let mut entry: Dir = start_directions[1].invert();
+    let mut position: Point = start.walk(start_directions[1]);
+
+    while position != end {
+        loop_length += 1;
+        on_loop[position] = true;
+        let pipe = Pipe::try_from(grid[position])?;
+        let exit = pipe.other_end(&entry).context("broken pipe")?;
+        position = position.walk(exit);
+        entry = exit.invert();
+    }
+
+    let is_vertical = |b| b == b'|' || b == b'L' || b == b'J';
+
+    let mut enclosed_count = 0;
+    for x in 0..height {
+        let mut parity: bool = false;
+        for y in 0..width {
+            let byte = grid.grid[x * width + y];
+            if !on_loop.grid[x * width + y] {
+                enclosed_count += parity as usize;
+            } else {
+                if is_vertical(byte) || byte == b'S' {
+                    parity = !parity;
+                }
+            }
+        }
+    }
+
+    println!("1) {}", loop_length / 2);
+    println!("2) {}", enclosed_count);
+
+    Ok(())
+}
diff --git a/src/bin/day11.rs b/src/bin/day11.rs
new file mode 100644
index 0000000..80d0656
--- /dev/null
+++ b/src/bin/day11.rs
@@ -0,0 +1,43 @@
+use anyhow::{Context, Result};
+use itertools::Itertools;
+
+fn main() -> Result<()> {
+    let filename = std::env::args()
+        .nth(1)
+        .context("./day11 <path to puzzle input>")?;
+    let input = std::fs::read_to_string(filename)?;
+    let lines: Vec<_> = input.lines().map(|line| line.as_bytes()).collect();
+
+    let height = lines.len();
+    let width = lines[0].len();
+
+    let galaxies: Vec<_> = (0..height)
+        .cartesian_product(0..width)
+        .filter(|&(x, y)| lines[x][y] == b'#')
+        .collect();
+
+    let mut is_empty_row = vec![true; height];
+    let mut is_empty_col = vec![true; width];
+
+    galaxies.iter().for_each(|&(x, y)| {
+        is_empty_row[x] = false;
+        is_empty_col[y] = false;
+    });
+
+    let empty_rows_count = |a: usize, b| (a.min(b)..a.max(b)).filter(|&x| is_empty_row[x]).count();
+    let empty_cols_count = |a: usize, b| (a.min(b)..a.max(b)).filter(|&y| is_empty_col[y]).count();
+
+    let distance = |(&(x1, y1), &(x2, y2)): (&(usize, usize), &(usize, usize)), scale: usize| {
+        let emptiness = empty_rows_count(x1, x2) + empty_cols_count(y1, y2);
+        x1.abs_diff(x2) + y1.abs_diff(y2) + (scale - 1) * emptiness
+    };
+
+    let galaxy_pairs = galaxies.iter().tuple_combinations();
+    let part1: usize = galaxy_pairs.clone().map(|p| distance(p, 2)).sum();
+    let part2: usize = galaxy_pairs.clone().map(|p| distance(p, 1000000)).sum();
+
+    println!("1) {}", part1);
+    println!("2) {}", part2);
+
+    Ok(())
+}
diff --git a/src/bin/day12.rs b/src/bin/day12.rs
new file mode 100644
index 0000000..b86357e
--- /dev/null
+++ b/src/bin/day12.rs
@@ -0,0 +1,99 @@
+use hashbrown::HashMap;
+use ndarray::Array3;
+
+use anyhow::{Context, Result};
+
+fn solve(str: &[u8], groups: &[usize]) -> usize {
+    if groups.iter().sum::<usize>() + groups.len() > str.len() + 1 {
+        return 0;
+    }
+
+    let groups_max = groups.iter().max().unwrap();
+    let mut dp = Array3::<usize>::zeros((str.len() + 1, groups.len() + 1, *groups_max + 1));
+    dp[[0, 0, 0]] = 1;
+
+    for s in 0..str.len() {
+        if str[s] == b'.' || str[s] == b'?' {
+            for g in 0..groups.len() {
+                dp[[s + 1, g, 0]] += dp[[s, g, 0]];
+                dp[[s + 1, g + 1, 0]] += dp[[s, g, groups[g]]];
+            }
+            dp[[s + 1, groups.len(), 0]] += dp[[s, groups.len(), 0]];
+        }
+
+        if str[s] == b'#' || str[s] == b'?' {
+            for g in 0..groups.len() {
+                for p in 0..groups[g] {
+                    dp[[s + 1, g, p + 1]] += dp[[s, g, p]];
+                }
+            }
+        }
+    }
+
+    dp[[str.len(), groups.len(), 0]] + dp[[str.len(), groups.len() - 1, groups[groups.len() - 1]]]
+}
+
+type Cache<'a> = HashMap<(&'a [u8], &'a [usize], usize), usize>;
+
+fn solve_rec<'a>(str: &'a [u8], groups: &'a [usize], pos: usize, cache: &mut Cache<'a>) -> usize {
+    let mut ans = 0;
+
+    if let Some(result) = cache.get(&(str, groups, pos)) {
+        return *result;
+    }
+
+    if str.len() == 0 {
+        return (groups.len() == 0 || (groups.len() == 1 && pos == groups[0])) as usize;
+    }
+
+    if str[0] == b'.' || str[0] == b'?' {
+        if groups.len() == 0 || pos == 0 {
+            ans += solve_rec(&str[1..], groups, pos, cache);
+        } else if pos == groups[0] {
+            ans += solve_rec(&str[1..], &groups[1..], 0, cache);
+        }
+    }
+
+    if str[0] == b'#' || str[0] == b'?' {
+        if groups.len() > 0 && pos < groups[0] {
+            ans += solve_rec(&str[1..], groups, pos + 1, cache);
+        }
+    }
+
+    cache.insert((str, groups, pos), ans);
+
+    return ans;
+}
+
+fn main() -> Result<()> {
+    let filename = std::env::args()
+        .nth(1)
+        .context("./day12 <path to puzzle input>")?;
+    let input = std::fs::read_to_string(filename)?;
+
+    let mut part1 = 0;
+    let mut part2 = 0;
+    for line in input.lines() {
+        let (record, groups) = line.split_once(' ').context("malformed input")?;
+        let groups: Vec<usize> = groups.split(',').map(|v| v.parse().unwrap()).collect();
+
+        part1 += solve_rec(record.as_bytes(), &groups, 0, &mut HashMap::new());
+
+        let mut record5 = record.to_string();
+        let mut groups5 = groups.clone();
+        record5.reserve_exact(4 * (record.len() + 1));
+        groups5.reserve_exact(4 * groups.len());
+        for _ in 0..4 {
+            record5.push('?');
+            record5.push_str(record);
+            groups5.extend(&groups);
+        }
+
+        part2 += solve(record5.as_bytes(), &groups5);
+    }
+
+    println!("1) {}", part1);
+    println!("2) {}", part2);
+
+    Ok(())
+}
diff --git a/src/bin/day13.rs b/src/bin/day13.rs
new file mode 100644
index 0000000..e9ba1a7
--- /dev/null
+++ b/src/bin/day13.rs
@@ -0,0 +1,47 @@
+use anyhow::{Context, Result};
+
+fn grid_count(x_max: usize, y_max: usize, predicate: impl Fn(usize, usize) -> bool) -> usize {
+    let mut count = 0;
+    for x in 0..x_max {
+        for y in 0..y_max {
+            count += predicate(x, y) as usize;
+        }
+    }
+    count
+}
+
+fn main() -> Result<()> {
+    let filename = std::env::args()
+        .nth(1)
+        .context("./day13 <path to puzzle input>")?;
+    let input = std::fs::read_to_string(filename)?;
+
+    let mut part1 = 0;
+    let mut part2 = 0;
+
+    for section in input.split("\n\n") {
+        let height = section.lines().count();
+        let grid: Vec<_> = section.lines().flat_map(|line| line.bytes()).collect();
+        let width = grid.len() / height;
+
+        let is_smudge_h = |i, x, y| grid[(i + x) * width + y] != grid[(i - x - 1) * width + y];
+        let is_smudge_v = |i, x, y| grid[x * width + i + y] != grid[x * width + (i - y - 1)];
+
+        for i in 1..height {
+            let smudge_count = grid_count(i.min(height - i), width, |x, y| is_smudge_h(i, x, y));
+            part1 += 100 * i * usize::from(smudge_count == 0);
+            part2 += 100 * i * usize::from(smudge_count == 1);
+        }
+
+        for i in 1..width {
+            let smudge_count = grid_count(height, i.min(width - i), |x, y| is_smudge_v(i, x, y));
+            part1 += i * usize::from(smudge_count == 0);
+            part2 += i * usize::from(smudge_count == 1);
+        }
+    }
+
+    println!("1) {}", part1);
+    println!("2) {}", part2);
+
+    Ok(())
+}
diff --git a/src/bin/day14.rs b/src/bin/day14.rs
new file mode 100644
index 0000000..03dccaf
--- /dev/null
+++ b/src/bin/day14.rs
@@ -0,0 +1,104 @@
+use hashbrown::HashMap;
+use itertools::iproduct;
+
+fn tilt_hori<I>(mut grid: Vec<u8>, h: usize, w: usize, range: I, y_delta: i64) -> Vec<u8>
+where
+    I: Iterator<Item = (usize, usize)>,
+{
+    let d = if y_delta == 1 { 0 } else { w - 1 };
+    let mut next_free = vec![d; h];
+    for (x, y) in range {
+        if grid[x * w + y] == b'#' {
+            next_free[x] = (y as i64 + y_delta) as usize;
+        }
+        if grid[x * w + y] == b'O' {
+            grid[x * w + y] = b'.';
+            grid[x * w + next_free[x]] = b'O';
+            next_free[x] = (next_free[x] as i64 + y_delta) as usize;
+        }
+    }
+
+    grid
+}
+
+fn tilt_vert<I>(mut grid: Vec<u8>, h: usize, w: usize, range: I, x_delta: i64) -> Vec<u8>
+where
+    I: Iterator<Item = (usize, usize)>,
+{
+    let d = if x_delta == 1 { 0 } else { h - 1 };
+    let mut next_free = vec![d; w];
+    for (x, y) in range {
+        if grid[x * w + y] == b'#' {
+            next_free[y] = (x as i64 + x_delta) as usize;
+        }
+        if grid[x * w + y] == b'O' {
+            grid[x * w + y] = b'.';
+            grid[next_free[y] * w + y] = b'O';
+            next_free[y] = (next_free[y] as i64 + x_delta) as usize;
+        }
+    }
+
+    grid
+}
+
+fn spin(mut grid: Vec<u8>, h: usize, w: usize) -> Vec<u8> {
+    grid = tilt_vert(grid, h, w, iproduct!(0..h, 0..w), 1); // north
+    grid = tilt_hori(grid, h, w, iproduct!(0..h, 0..w), 1); // west
+    grid = tilt_vert(grid, h, w, iproduct!((0..h).rev(), (0..w).rev()), -1); // south
+    grid = tilt_hori(grid, h, w, iproduct!((0..h).rev(), (0..w).rev()), -1); // east
+    return grid;
+}
+
+fn spin_n(mut grid: Vec<u8>, h: usize, w: usize, spin_count: usize) -> Vec<u8> {
+    let mut past: HashMap<(usize, usize), usize> = HashMap::new();
+    for spins in 0..spin_count {
+        let mut load = (0, 0);
+        for (x, y) in iproduct!(0..h, 0..w) {
+            if grid[x * w + y] == b'O' {
+                load.0 += h - x;
+                load.1 += w - y;
+            }
+        }
+
+        if let Some(first_seen) = past.get(&load) {
+            let offset = (spin_count - first_seen) % (spins - first_seen);
+            for _ in 0..offset {
+                grid = spin(grid, h, w);
+            }
+            return grid;
+        }
+
+        past.insert(load, spins);
+        grid = spin(grid, h, w);
+    }
+
+    grid
+}
+
+fn main() {
+    let filename = std::env::args().nth(1).unwrap();
+    let input = std::fs::read_to_string(filename).unwrap();
+    let w = input.lines().next().unwrap().len();
+    let grid: Vec<_> = input.lines().flat_map(|line| line.bytes()).collect();
+    let h = grid.len() / w;
+
+    let tilt_north = |grid: Vec<u8>| tilt_vert(grid, h, w, iproduct!(0..h, 0..w), 1);
+
+    let boulder_load = |(x, y), grid: &Vec<u8>| {
+        if grid[x * w + y] == b'O' {
+            h - x
+        } else {
+            0
+        }
+    };
+
+    let north_load = |grid| -> usize { iproduct!(0..h, 0..w).map(|p| boulder_load(p, grid)).sum() };
+
+    let grid1 = tilt_north(grid.clone());
+    let part1 = north_load(&grid1);
+    println!("{}", part1);
+
+    let grid2 = spin_n(grid, h, w, 1_000_000_000);
+    let part2 = north_load(&grid2);
+    println!("{}", part2);
+}
diff --git a/src/bin/day15.rs b/src/bin/day15.rs
new file mode 100644
index 0000000..9af9e58
--- /dev/null
+++ b/src/bin/day15.rs
@@ -0,0 +1,46 @@
+use std::collections::HashMap;
+
+use anyhow::{Context, Result};
+
+fn main() -> Result<()> {
+    let filename = std::env::args()
+        .nth(1)
+        .context("./day15 <path to puzzle input>")?;
+    let input = std::fs::read_to_string(filename)?;
+    let sequence: Vec<_> = input.trim().split(',').map(|s| s.as_bytes()).collect();
+
+    let update = |state, c| (state + c as usize) * 17 % 256;
+    let hash = |w: &[u8]| w.iter().copied().fold(0, update);
+    let part1: usize = sequence.iter().map(|w| hash(w)).sum();
+
+    let mut buckets = vec![HashMap::new(); 256];
+    for (counter, step) in sequence.into_iter().enumerate() {
+        if step[step.len() - 1] == b'-' {
+            let key = &step[..step.len() - 1];
+            buckets[hash(key)].remove(key);
+        } else {
+            let (key, focal) = step.split_at(step.len() - 2);
+            let focal = focal[1] - b'0';
+
+            buckets[hash(key)]
+                .entry(key)
+                .and_modify(|(_, old_focal)| *old_focal = focal)
+                .or_insert((counter, focal));
+        }
+    }
+
+    let mut part2 = 0;
+    for (bucket, b_id) in buckets.into_iter().zip(1..) {
+        let mut v: Vec<_> = bucket.into_values().collect();
+        v.sort();
+
+        for ((_, focal), position) in v.into_iter().zip(1..) {
+            part2 += b_id * position * (focal as usize);
+        }
+    }
+
+    println!("1) {}", part1);
+    println!("2) {}", part2);
+
+    Ok(())
+}
diff --git a/src/bin/day17.rs b/src/bin/day17.rs
new file mode 100644
index 0000000..7b48186
--- /dev/null
+++ b/src/bin/day17.rs
@@ -0,0 +1,78 @@
+use anyhow::{Context, Result};
+
+fn min_heat_loss(grid: &Vec<u8>, h: i32, w: i32, min_steps: i32, max_steps: i32) -> Option<usize> {
+    let is_valid = |x, y| 0 <= x && x < h && 0 <= y && y < w;
+    let read = |x, y| (grid[(x * w + y) as usize] - b'0') as usize;
+
+    let bucket_count = ((max_steps * 9) as usize).next_power_of_two();
+    let mut queue = vec![Vec::new(); bucket_count];
+    queue[0].push(((0, 0), (0, 1)));
+    queue[0].push(((0, 0), (1, 0)));
+    let mut dist = vec![[usize::MAX, usize::MAX]; grid.len()];
+    let mut heat_loss = 0;
+    let mut queue_size = 2;
+
+    while queue_size > 0 {
+        while let Some(((x, y), (dx, dy))) = queue[heat_loss % bucket_count].pop() {
+            queue_size -= 1;
+
+            if x == h - 1 && y == w - 1 {
+                return Some(heat_loss);
+            }
+
+            if heat_loss > dist[(x * w + y) as usize][(dx == 0) as usize] {
+                continue;
+            }
+
+            for (dx, dy) in [(dy, -dx), (-dy, dx)] {
+                let (mut nx, mut ny) = (x, y);
+                let mut path_loss = 0;
+
+                for i in 1..=max_steps {
+                    nx += dx;
+                    ny += dy;
+
+                    if !is_valid(nx, ny) {
+                        break;
+                    }
+
+                    path_loss += read(nx, ny);
+
+                    if i >= min_steps {
+                        let is_horizontal = dx == 0;
+                        let dist_pos = nx * w + ny;
+                        let old_dist = dist[dist_pos as usize][is_horizontal as usize];
+                        let new_dist = heat_loss + path_loss;
+                        if new_dist < old_dist {
+                            dist[dist_pos as usize][is_horizontal as usize] = new_dist;
+                            queue[new_dist % bucket_count].push(((nx, ny), (dx, dy)));
+                            queue_size += 1;
+                        }
+                    }
+                }
+            }
+        }
+
+        heat_loss += 1;
+    }
+
+    None
+}
+
+fn main() -> Result<()> {
+    let filename = std::env::args()
+        .nth(1)
+        .context("./day17 <path to puzzle input>")?;
+    let input = std::fs::read_to_string(filename)?;
+    let width = input.lines().next().unwrap().len();
+    let grid: Vec<_> = input.lines().flat_map(|l| l.bytes()).collect();
+    let height = grid.len() / width;
+
+    let part1 = min_heat_loss(&grid, height as i32, width as i32, 1, 3);
+    let part2 = min_heat_loss(&grid, height as i32, width as i32, 4, 10);
+
+    println!("1) {:?}", part1);
+    println!("2) {:?}", part2);
+
+    Ok(())
+}
diff --git a/src/bin/day18.rs b/src/bin/day18.rs
new file mode 100644
index 0000000..1555bbf
--- /dev/null
+++ b/src/bin/day18.rs
@@ -0,0 +1,56 @@
+use std::str;
+
+use anyhow::{Context, Result};
+
+fn area(moves: impl Iterator<Item = ((i64, i64), i64)>) -> i64 {
+    let (mut x, mut y) = (0i64, 0i64);
+    let mut area = 0;
+    for ((dx, dy), dist) in moves {
+        let (nx, ny) = (dist * dx + x, dist * dy + y);
+        area += x * ny - y * nx;
+        area -= i64::abs(nx - x) + i64::abs(ny - y);
+        (x, y) = (nx, ny);
+    }
+    i64::abs(area / 2) + 1
+}
+
+fn main() -> Result<()> {
+    let filename = std::env::args()
+        .nth(1)
+        .context("./day18 <path to puzzle input>")?;
+    let input = std::fs::read_to_string(filename)?;
+    let lines = input.lines().map(|line| line.as_bytes());
+
+    let dirs = [(0, 1), (1, 0), (0, -1), (-1, 0)];
+    let to_dir = |c| match c {
+        b'R' => dirs[0],
+        b'L' => dirs[2],
+        b'U' => dirs[3],
+        b'D' => dirs[1],
+        _ => unreachable!(),
+    };
+
+    let read_p1 = |line: &[u8]| {
+        let dir = line[0];
+        let dist = &line[2..line.len() - 10];
+        let dist = str::from_utf8(dist).unwrap().parse::<i64>().unwrap();
+        (to_dir(dir), dist)
+    };
+
+    let read_p2 = |line: &[u8]| {
+        let dir = line[line.len() - 2] - b'0';
+        let dist = &line[line.len() - 7..line.len() - 2];
+        let dist = str::from_utf8(dist).unwrap();
+        let dist = i64::from_str_radix(dist, 16).unwrap();
+
+        (dirs[dir as usize], dist)
+    };
+
+    let part1 = area(lines.clone().map(read_p1));
+    let part2 = area(lines.clone().map(read_p2));
+
+    println!("1) {}", part1);
+    println!("2) {}", part2);
+
+    Ok(())
+}
diff --git a/src/bin/day19.rs b/src/bin/day19.rs
new file mode 100644
index 0000000..9893365
--- /dev/null
+++ b/src/bin/day19.rs
@@ -0,0 +1,160 @@
+use std::cmp::Ordering;
+use std::collections::HashMap;
+
+use itertools::Itertools;
+
+use anyhow::{Context, Result};
+
+const MALFORMED: &str = "malformed input";
+
+struct Rule {
+    property: u8,
+    comp: Ordering,
+    value: u32,
+}
+
+struct Workflow<'a> {
+    rules: Vec<(Rule, &'a str)>,
+    default: &'a str,
+}
+
+impl<'a> TryFrom<&'a str> for Workflow<'a> {
+    type Error = anyhow::Error;
+
+    fn try_from(str: &'a str) -> Result<Self> {
+        match str.rsplit_once(',') {
+            Some((rules_str, default)) => {
+                let mut rules = Vec::new();
+                for rule in rules_str.split(',') {
+                    let (condition, dest) = rule.split_once(':').context("MALFORMED")?;
+                    let property = index(condition.as_bytes()[0]);
+                    let comp = condition.as_bytes()[1].cmp(&b'=');
+                    let value = (&condition[2..]).parse()?;
+                    rules.push((
+                        Rule {
+                            property,
+                            comp,
+                            value,
+                        },
+                        dest,
+                    ));
+                }
+                Ok(Workflow { rules, default })
+            }
+            None => Ok(Workflow {
+                rules: Vec::new(),
+                default: str,
+            }),
+        }
+    }
+}
+
+impl<'a> Workflow<'a> {
+    fn process(&self, state: &[u32; 4]) -> &'a str {
+        for (rule, dst) in self.rules.iter() {
+            if state[rule.property as usize].cmp(&rule.value) == rule.comp {
+                return dst;
+            }
+        }
+
+        return self.default;
+    }
+}
+
+fn index(b: u8) -> u8 {
+    match b {
+        b'x' => 0,
+        b'm' => 1,
+        b'a' => 2,
+        b's' => 3,
+        _ => unreachable!(),
+    }
+}
+
+fn main() -> Result<()> {
+    let filename = std::env::args()
+        .nth(1)
+        .context("./day19 <path to puzzle input>")?;
+    let input = std::fs::read_to_string(filename)?;
+    let (workflows_str, parts_str) = input.split("\n\n").next_tuple().context(MALFORMED)?;
+
+    let mut workflows = HashMap::new();
+    for workflow in workflows_str.lines() {
+        let (name, body) = workflow.split_once('{').context(MALFORMED)?;
+        workflows.insert(name, Workflow::try_from(&body[..body.len() - 1])?);
+    }
+
+    let mut parts = Vec::new();
+    for part_str in parts_str.lines() {
+        let mut part = [0, 0, 0, 0];
+        for (idx, property) in part_str[1..part.len() - 1].split(',').enumerate() {
+            part[idx] = property[2..].parse()?;
+        }
+
+        parts.push(part);
+    }
+
+    let mut part1: u64 = 0;
+    for part in parts.iter() {
+        let mut current = "in";
+        while (current != "A") & (current != "R") {
+            let workflow = workflows.get(&current).context(MALFORMED)?;
+            current = workflow.process(part);
+        }
+
+        if current == "A" {
+            part1 += part.iter().map(|&v| v as u64).sum::<u64>();
+        }
+    }
+
+    let split_bound = |rule: &Rule, bound: (u32, u32)| match rule.comp {
+        Ordering::Less => (
+            (bound.0, bound.1.min(rule.value)),
+            (bound.0.max(rule.value), bound.1),
+        ),
+        Ordering::Greater => (
+            (bound.0.max(rule.value + 1), bound.1),
+            (bound.0, bound.1.min(rule.value + 1)),
+        ),
+        _ => unreachable!(),
+    };
+
+    let mut part2 = 0;
+    let mut stack = Vec::new();
+    stack.push(("in", [(1, 4001), (1, 4001), (1, 4001), (1, 4001)]));
+    'outer: while let Some((current, mut bounds)) = stack.pop() {
+        if current == "A" {
+            part2 += bounds.iter().map(|(a, b)| (b - a) as u64).product::<u64>();
+            continue;
+        }
+
+        if current == "R" {
+            continue;
+        }
+
+        let workflow = workflows.get(&current).context(MALFORMED)?;
+
+        for (rule, dest) in workflow.rules.iter() {
+            let bound = bounds[rule.property as usize];
+            let (send, carry) = split_bound(rule, bound);
+            if send.0 < send.1 {
+                let mut new_bounds = bounds;
+                new_bounds[rule.property as usize] = send;
+                stack.push((dest, new_bounds));
+            }
+
+            if carry.0 < carry.1 {
+                bounds[rule.property as usize] = carry;
+            } else {
+                continue 'outer;
+            }
+        }
+
+        stack.push((workflow.default, bounds));
+    }
+
+    println!("1) {}", part1);
+    println!("2) {}", part2);
+
+    Ok(())
+}
diff --git a/src/bin/day20.rs b/src/bin/day20.rs
new file mode 100644
index 0000000..95fc920
--- /dev/null
+++ b/src/bin/day20.rs
@@ -0,0 +1,175 @@
+use std::collections::VecDeque;
+
+use anyhow::{Context, Result};
+use hashbrown::{HashMap, HashSet};
+
+#[derive(Clone)]
+enum Gate<'a> {
+    FlipFlop {
+        high: bool,
+    },
+    Conjugation {
+        memory: HashSet<&'a str>,
+        in_count: usize,
+    },
+    Negate,
+    Broadcast,
+}
+
+fn main() -> Result<()> {
+    let filename = std::env::args()
+        .nth(1)
+        .context("./day20 <path to puzzle input>")?;
+    let input = std::fs::read_to_string(filename)?;
+
+    let mut gates: HashMap<&str, Gate> = HashMap::new();
+    let mut outs = HashMap::new();
+    let mut ins = HashMap::new();
+    for line in input.lines() {
+        let (source, dsts) = line.split_once(" -> ").context("malformed input.")?;
+        let dsts: Vec<_> = dsts.split(", ").collect();
+        let name = source.trim_start_matches(['&', '%']);
+
+        for dst in dsts.iter().copied() {
+            ins.entry(dst).or_insert(Vec::new()).push(name);
+        }
+        outs.insert(name, dsts);
+
+        let gate = match source.chars().next().unwrap() {
+            '%' => Gate::FlipFlop { high: false },
+            '&' => Gate::Conjugation {
+                memory: HashSet::new(),
+                in_count: 0,
+            },
+            'b' => Gate::Broadcast,
+            _ => unreachable!(),
+        };
+
+        gates.insert(name, gate);
+    }
+
+    for (name, gate) in gates.iter_mut() {
+        if let Gate::Conjugation {
+            memory: _,
+            in_count,
+        } = gate
+        {
+            *in_count = ins[name].len();
+
+            if *in_count == 1 {
+                *gate = Gate::Negate;
+            }
+        }
+    }
+
+    let mut counts = [0, 0];
+    let mut queue = VecDeque::new();
+    for _ in 0..1000 {
+        queue.push_back(("broadcaster", "button", false));
+
+        while let Some((dest, source, is_high)) = queue.pop_back() {
+            counts[is_high as usize] += 1;
+
+            let outs = match outs.get(dest) {
+                Some(v) => v,
+                None => {
+                    continue;
+                }
+            };
+
+            if let Some(gate) = gates.get_mut(dest) {
+                match gate {
+                    Gate::Broadcast => {
+                        for out in outs {
+                            queue.push_back((out, dest, false));
+                        }
+                    }
+                    Gate::Negate => {
+                        for out in outs {
+                            queue.push_back((out, dest, !is_high));
+                        }
+                    }
+                    Gate::FlipFlop { high } => {
+                        if !is_high {
+                            *high = !(*high);
+                            for out in outs {
+                                queue.push_back((out, dest, *high));
+                            }
+                        }
+                    }
+                    Gate::Conjugation { memory, in_count } => {
+                        if is_high {
+                            memory.insert(source);
+                        } else {
+                            memory.remove(source);
+                        }
+
+                        let signal = memory.len() < *in_count;
+                        for out in outs {
+                            queue.push_back((out, dest, signal));
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    let part1 = counts[0] * counts[1];
+
+    // Assumed structure:
+    // broadcast ----> COUNTER1 ----> NEGATE -----> CONJ ----> rx
+    //    |----------> COUNTER2 ----> NEGATE --------|
+    //    |----------> COUNTER3 ----> NEGATE --------|
+    //    `----------> COUNTER4 ----> NEGATE --------´
+    //
+    // Where Counter:
+    //  IN
+    //  |
+    //  v
+    //  FF <-> Core --> OUT
+    //  |       ? ^
+    //  V       | |
+    //  FF ?----´ |
+    //  |         |
+    //  v         |
+    //  FF--------´
+	//
+	//  Counters are assumed to trigger on prime values
+	//
+
+
+    let mut part2 = 1;
+    for mut root in outs["broadcaster"].iter().copied() {
+        let core = match &gates[&outs[root][0]] {
+            Gate::Conjugation {
+                memory: _,
+                in_count: _,
+            } => outs[root][0],
+            _ => outs[root][1],
+        };
+
+        let mut period = 0u64;
+        let mut exp = 0u64;
+
+        loop {
+            if outs[root].contains(&core) {
+                period += 1 << exp;
+            }
+            exp += 1;
+
+            root = match outs[root].iter().find(|&&v| v != core) {
+                Some(v) => v,
+                None => {
+                    break;
+                }
+            };
+        }
+
+        part2 *= period;
+    }
+
+    println!("1) {}", part1);
+    println!("2) {}", part2);
+
+    Ok(())
+}
diff --git a/src/bin/day21.rs b/src/bin/day21.rs
new file mode 100644
index 0000000..8c47cd7
--- /dev/null
+++ b/src/bin/day21.rs
@@ -0,0 +1,160 @@
+use anyhow::{Context, Result};
+
+fn bfs(grid: &Vec<u8>, height: usize, width: usize, start: (i64, i64)) -> Vec<u64> {
+    let mut distances = vec![u64::MAX; grid.len()];
+    distances[start.0 as usize * width + start.1 as usize] = 0;
+
+    let height = height as i64;
+    let width = width as i64;
+
+    let mut todo = Vec::from([start]);
+    let mut next = Vec::new();
+    let mut distance = 0;
+    while !todo.is_empty() {
+        for (x, y) in todo.iter() {
+            for (dx, dy) in [(1, 0), (-1, 0), (0, 1), (0, -1)] {
+                let (nx, ny) = (x + dx, y + dy);
+                if 0 <= nx && nx < height && 0 <= ny && ny < width {
+                    let index = (nx * width + ny) as usize;
+                    if grid[index] != b'#' && distance + 1 < distances[index] {
+                        distances[index] = distance + 1;
+                        next.push((nx, ny));
+                    }
+                }
+            }
+        }
+
+        todo.clear();
+        todo.append(&mut next);
+        distance += 1;
+    }
+
+    return distances;
+}
+
+fn repeat_grid(factor: usize, grid: &Vec<u8>, height: usize, width: usize) -> Vec<u8> {
+    let mut result = vec![0; height * width * factor * factor];
+
+    for xf in 0..factor {
+        for yf in 0..factor {
+            let base = xf * height * width * factor + yf * width;
+            for x in 0..height {
+                for y in 0..width {
+                    result[base + x * width * factor + y] = grid[x * width + y];
+                }
+            }
+        }
+    }
+    return result;
+}
+
+fn main() -> Result<()> {
+    let filename = std::env::args()
+        .nth(1)
+        .context("./day21 <path to puzzle input>")?;
+    let input = std::fs::read_to_string(filename)?;
+    let width = input.lines().next().unwrap().len();
+    let grid: Vec<_> = input.lines().flat_map(|line| line.bytes()).collect();
+    let height = grid.len() / width;
+
+    let mut start1 = (0, 0);
+    for x in 0..height {
+        for y in 0..width {
+            if grid[x * width + y] == b'S' {
+                start1 = (x as i64, y as i64);
+            }
+        }
+    }
+
+    let distances = bfs(&grid, height, width, start1);
+
+    let steps_p1 = 64;
+    let mut part1 = 0;
+    for x in 0..height {
+        for y in 0..width {
+            let distance = distances[x * width + y];
+            if distance <= steps_p1 && distance % 2 == steps_p1 % 2 {
+                part1 += 1;
+            }
+        }
+    }
+
+    let center = (height as i64 / 2, width as i64 / 2);
+    let scale = 2usize;
+    let repeats = scale * 2 + 1;
+    let scale_center = (
+        center.0 + (scale * height) as i64,
+        center.1 + (scale * width) as i64,
+    );
+    let scale_grid = repeat_grid(repeats, &grid, height, width);
+
+    let distances = bfs(&scale_grid, height * repeats, width * repeats, scale_center);
+
+    let mut counts = vec![vec![0; repeats]; repeats];
+    let limit = (scale * height + height / 2) as u64;
+    for qx in 0..repeats {
+        for qy in 0..repeats {
+            let base = qx * height * width * repeats + qy * width;
+            for x in 0..height {
+                for y in 0..width {
+                    let distance = distances[base + x * width * repeats + y];
+                    if distance <= limit as u64 && limit as u64 % 2 == distance % 2 {
+                        counts[qx][qy] += 1;
+                    }
+                }
+            }
+        }
+    }
+
+    let part_2_steps = 26501365;
+    let part_2_scale: u64 = ((part_2_steps - height / 2) / height) as u64;
+
+    let mut part2 = 0;
+
+    for x in 0..repeats {
+        for y in 0..repeats {
+            print!("{: >6} ", counts[x][y]);
+        }
+
+        println!();
+    }
+
+    // ..*#*..
+    // .*'o'*.
+    // *'o+o'*
+    // #o+o+o#
+    // *'o+o'*
+    // .*'o'*.
+    // ..*#*..
+
+    // o Even centers
+    let inner_even_count = ((part_2_scale - 1) | 0x1) * ((part_2_scale - 1) | 0x1);
+    part2 += inner_even_count * counts[scale][scale];
+
+    let inner_odd_count = (part_2_scale & (!0x1)) * (part_2_scale & (!0x1));
+    // + Odd centers
+    part2 += inner_odd_count * counts[scale][scale + 1];
+
+    // # Pointy ends
+    part2 += counts[0][scale];
+    part2 += counts[repeats - 1][scale];
+    part2 += counts[scale][0];
+    part2 += counts[scale][repeats - 1];
+
+    // * Outer edges
+    part2 += part_2_scale * counts[0][scale - 1];
+    part2 += part_2_scale * counts[0][scale + 1];
+    part2 += part_2_scale * counts[repeats - 1][scale - 1];
+    part2 += part_2_scale * counts[repeats - 1][scale + 1];
+
+    // ' Inner edges
+    part2 += (part_2_scale - 1) * counts[1][scale - 1];
+    part2 += (part_2_scale - 1) * counts[1][scale + 1];
+    part2 += (part_2_scale - 1) * counts[repeats - 2][scale - 1];
+    part2 += (part_2_scale - 1) * counts[repeats - 2][scale + 1];
+
+    println!("1) {}", part1);
+    println!("2) {}", part2);
+
+    Ok(())
+}