solve day 18!

it was kinda ez

.envrc

@@ -1 +1 @@
-eval $(opam config env)
+eval $(opam env --switch=.)

.gitignore

@@ -1,2 +1,3 @@
 .DS_Store
 _build/
+_opam/

.ocamlformat

@@ -1,2 +1 @@
 profile = janestreet
-version = 0.26.0

.ocamlinit

@@ -0,0 +1,2 @@
+#install_printer Aoc.Vec2.pp;;
+#install_printer Aoc.Grid.pp;;

README.md

@@ -0,0 +1,6 @@
+## 2022 AOC problems in Ocaml 
+
+```sh
+$ opam switch create . --deps-only -y
+$ dune build
+```

aoc.opam

@@ -10,8 +10,21 @@ homepage: "https://github.com/username/reponame"
 doc: "https://url/to/documentation"
 bug-reports: "https://github.com/username/reponame/issues"
 depends: [
+  "utop"
+  "ocaml-lsp-server"
+  "ocamlformat"
   "ocaml"
   "dune" {>= "3.10"}
+  "re"
+  "containers"
+  "iter"
+  "dune-site"
+  "angstrom"
+  "ppx_deriving"
+  "ppx_deriving_hash"
+  "ppx_regexp"
+  "ppx_expect"
+  "ppx_inline_test"
   "odoc" {with-doc}
 ]
 build: [

dune-project

@@ -21,7 +21,28 @@
  (name aoc)
  (synopsis "A short synopsis")
  (description "A longer description")
- (depends ocaml dune)
+ (depends
+   ;; development env
+   utop
+   ocaml-lsp-server
+   ocamlformat
+
+   ;; deps
+   ocaml
+   dune
+   re
+   containers
+   iter
+   dune-site
+   angstrom
+
+   ;; ppx
+   ppx_deriving
+   ppx_deriving_hash
+   ppx_regexp
+   ppx_expect
+   ppx_inline_test
+ )
  (sites (lib inputs))
  (tags
   (topics "to describe" your project)))

exe/dune

@@ -1,4 +0,0 @@
-(executable
- (public_name aoc)
- (name main)
- (libraries aoc))

exe/main.ml

@@ -1,6 +0,0 @@
-open Aoc
-
-let () =
-  Day1.print ();
-  Day2.print ()
-;;

inputs/day10.tt

@@ -0,0 +1,143 @@
+addx 2
+addx 3
+noop
+noop
+addx 1
+addx 5
+addx -1
+addx 5
+addx 1
+noop
+noop
+addx 4
+noop
+noop
+addx 5
+addx -5
+addx 6
+addx 3
+addx 1
+addx 5
+addx 1
+noop
+addx -38
+addx 41
+addx -22
+addx -14
+addx 7
+noop
+noop
+addx 3
+addx -2
+addx 2
+noop
+addx 17
+addx -12
+addx 5
+addx 2
+addx -16
+addx 17
+addx 2
+addx 5
+addx 2
+addx -30
+noop
+addx -6
+addx 1
+noop
+addx 5
+noop
+noop
+noop
+addx 5
+addx -12
+addx 17
+noop
+noop
+noop
+noop
+addx 5
+addx 10
+addx -9
+addx 2
+addx 5
+addx 2
+addx -5
+addx 6
+addx 4
+noop
+noop
+addx -37
+noop
+noop
+addx 17
+addx -12
+addx 30
+addx -23
+addx 2
+noop
+addx 3
+addx -17
+addx 22
+noop
+noop
+noop
+addx 5
+noop
+addx -10
+addx 11
+addx 4
+noop
+addx 5
+addx -2
+noop
+addx -6
+addx -29
+addx 37
+addx -30
+addx 27
+addx -2
+addx -22
+noop
+addx 3
+addx 2
+noop
+addx 7
+addx -2
+addx 2
+addx 5
+addx -5
+addx 6
+addx 2
+addx 2
+addx 5
+addx -25
+noop
+addx -10
+noop
+addx 1
+noop
+addx 2
+noop
+noop
+noop
+noop
+addx 7
+addx 1
+addx 4
+addx 1
+noop
+addx 2
+noop
+addx 3
+addx 5
+addx -1
+noop
+addx 3
+addx 5
+addx 2
+addx 1
+noop
+noop
+noop
+noop

inputs/day11.tt

@@ -0,0 +1,55 @@
+Monkey 0:
+  Starting items: 97, 81, 57, 57, 91, 61
+  Operation: new = old * 7
+  Test: divisible by 11
+    If true: throw to monkey 5
+    If false: throw to monkey 6
+
+Monkey 1:
+  Starting items: 88, 62, 68, 90
+  Operation: new = old * 17
+  Test: divisible by 19
+    If true: throw to monkey 4
+    If false: throw to monkey 2
+
+Monkey 2:
+  Starting items: 74, 87
+  Operation: new = old + 2
+  Test: divisible by 5
+    If true: throw to monkey 7
+    If false: throw to monkey 4
+
+Monkey 3:
+  Starting items: 53, 81, 60, 87, 90, 99, 75
+  Operation: new = old + 1
+  Test: divisible by 2
+    If true: throw to monkey 2
+    If false: throw to monkey 1
+
+Monkey 4:
+  Starting items: 57
+  Operation: new = old + 6
+  Test: divisible by 13
+    If true: throw to monkey 7
+    If false: throw to monkey 0
+
+Monkey 5:
+  Starting items: 54, 84, 91, 55, 59, 72, 75, 70
+  Operation: new = old * old
+  Test: divisible by 7
+    If true: throw to monkey 6
+    If false: throw to monkey 3
+
+Monkey 6:
+  Starting items: 95, 79, 79, 68, 78
+  Operation: new = old + 3
+  Test: divisible by 3
+    If true: throw to monkey 1
+    If false: throw to monkey 3
+
+Monkey 7:
+  Starting items: 61, 97, 67
+  Operation: new = old + 4
+  Test: divisible by 17
+    If true: throw to monkey 0
+    If false: throw to monkey 5

inputs/day12.tt

@@ -0,0 +1,41 @@
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inputs/day13.tt

@@ -0,0 +1,449 @@
+[[9,[8,[7]],4,7,[[4,9,3,2],6,5,[1,10,2,4,5],[1,3,2,6,1]]],[4,[6],3],[4,[7,0,3,8,8],[7,[10],[10,10,10,7]]]]
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+
+[[[8,2],2,[[10],[],6,10,[10,10,3,10,3]]],[],[]]
+[[[[7,3,5],10,[4,1,0,8,7],9],10,[]]]
+
+[[6,2,[2,[10,10,0],[2]],7]]
+[[7,9],[5,[8,[0,5,5,10,4],6,8,6],3,[4],2],[4]]
+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+[[7,[10,1,[5,3,9],1,[]]]]
+
+[[[[8,2,10,7,3],8,[0,7,0]]]]
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inputs/day14.tt

@@ -0,0 +1,148 @@
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+523,63 -> 523,66 -> 515,66 -> 515,71 -> 529,71 -> 529,66 -> 528,66 -> 528,63
+508,28 -> 513,28
+501,161 -> 501,152 -> 501,161 -> 503,161 -> 503,157 -> 503,161 -> 505,161 -> 505,155 -> 505,161 -> 507,161 -> 507,154 -> 507,161 -> 509,161 -> 509,155 -> 509,161
+523,63 -> 523,66 -> 515,66 -> 515,71 -> 529,71 -> 529,66 -> 528,66 -> 528,63
+511,167 -> 516,167
+549,97 -> 554,97
+541,91 -> 546,91
+522,47 -> 522,43 -> 522,47 -> 524,47 -> 524,41 -> 524,47 -> 526,47 -> 526,39 -> 526,47 -> 528,47 -> 528,39 -> 528,47
+522,47 -> 522,43 -> 522,47 -> 524,47 -> 524,41 -> 524,47 -> 526,47 -> 526,39 -> 526,47 -> 528,47 -> 528,39 -> 528,47
+520,34 -> 525,34
+522,47 -> 522,43 -> 522,47 -> 524,47 -> 524,41 -> 524,47 -> 526,47 -> 526,39 -> 526,47 -> 528,47 -> 528,39 -> 528,47
+515,60 -> 515,52 -> 515,60 -> 517,60 -> 517,55 -> 517,60 -> 519,60 -> 519,50 -> 519,60 -> 521,60 -> 521,56 -> 521,60 -> 523,60 -> 523,53 -> 523,60 -> 525,60 -> 525,53 -> 525,60
+501,161 -> 501,152 -> 501,161 -> 503,161 -> 503,157 -> 503,161 -> 505,161 -> 505,155 -> 505,161 -> 507,161 -> 507,154 -> 507,161 -> 509,161 -> 509,155 -> 509,161
+522,47 -> 522,43 -> 522,47 -> 524,47 -> 524,41 -> 524,47 -> 526,47 -> 526,39 -> 526,47 -> 528,47 -> 528,39 -> 528,47
+501,161 -> 501,152 -> 501,161 -> 503,161 -> 503,157 -> 503,161 -> 505,161 -> 505,155 -> 505,161 -> 507,161 -> 507,154 -> 507,161 -> 509,161 -> 509,155 -> 509,161
+505,30 -> 510,30
+543,103 -> 548,103
+510,146 -> 515,146
+522,84 -> 522,76 -> 522,84 -> 524,84 -> 524,75 -> 524,84 -> 526,84 -> 526,81 -> 526,84 -> 528,84 -> 528,74 -> 528,84 -> 530,84 -> 530,79 -> 530,84 -> 532,84 -> 532,77 -> 532,84 -> 534,84 -> 534,78 -> 534,84 -> 536,84 -> 536,80 -> 536,84
+498,173 -> 503,173
+498,13 -> 498,15 -> 492,15 -> 492,23 -> 506,23 -> 506,15 -> 501,15 -> 501,13
+501,161 -> 501,152 -> 501,161 -> 503,161 -> 503,157 -> 503,161 -> 505,161 -> 505,155 -> 505,161 -> 507,161 -> 507,154 -> 507,161 -> 509,161 -> 509,155 -> 509,161
+523,63 -> 523,66 -> 515,66 -> 515,71 -> 529,71 -> 529,66 -> 528,66 -> 528,63
+515,60 -> 515,52 -> 515,60 -> 517,60 -> 517,55 -> 517,60 -> 519,60 -> 519,50 -> 519,60 -> 521,60 -> 521,56 -> 521,60 -> 523,60 -> 523,53 -> 523,60 -> 525,60 -> 525,53 -> 525,60
+522,47 -> 522,43 -> 522,47 -> 524,47 -> 524,41 -> 524,47 -> 526,47 -> 526,39 -> 526,47 -> 528,47 -> 528,39 -> 528,47
+498,13 -> 498,15 -> 492,15 -> 492,23 -> 506,23 -> 506,15 -> 501,15 -> 501,13
+515,60 -> 515,52 -> 515,60 -> 517,60 -> 517,55 -> 517,60 -> 519,60 -> 519,50 -> 519,60 -> 521,60 -> 521,56 -> 521,60 -> 523,60 -> 523,53 -> 523,60 -> 525,60 -> 525,53 -> 525,60
+533,108 -> 533,109 -> 538,109 -> 538,108
+517,146 -> 522,146
+515,60 -> 515,52 -> 515,60 -> 517,60 -> 517,55 -> 517,60 -> 519,60 -> 519,50 -> 519,60 -> 521,60 -> 521,56 -> 521,60 -> 523,60 -> 523,53 -> 523,60 -> 525,60 -> 525,53 -> 525,60
+501,161 -> 501,152 -> 501,161 -> 503,161 -> 503,157 -> 503,161 -> 505,161 -> 505,155 -> 505,161 -> 507,161 -> 507,154 -> 507,161 -> 509,161 -> 509,155 -> 509,161
+513,144 -> 518,144
+515,170 -> 520,170
+501,161 -> 501,152 -> 501,161 -> 503,161 -> 503,157 -> 503,161 -> 505,161 -> 505,155 -> 505,161 -> 507,161 -> 507,154 -> 507,161 -> 509,161 -> 509,155 -> 509,161
+520,130 -> 520,133 -> 515,133 -> 515,138 -> 533,138 -> 533,133 -> 525,133 -> 525,130
+515,60 -> 515,52 -> 515,60 -> 517,60 -> 517,55 -> 517,60 -> 519,60 -> 519,50 -> 519,60 -> 521,60 -> 521,56 -> 521,60 -> 523,60 -> 523,53 -> 523,60 -> 525,60 -> 525,53 -> 525,60
+523,63 -> 523,66 -> 515,66 -> 515,71 -> 529,71 -> 529,66 -> 528,66 -> 528,63
+522,84 -> 522,76 -> 522,84 -> 524,84 -> 524,75 -> 524,84 -> 526,84 -> 526,81 -> 526,84 -> 528,84 -> 528,74 -> 528,84 -> 530,84 -> 530,79 -> 530,84 -> 532,84 -> 532,77 -> 532,84 -> 534,84 -> 534,78 -> 534,84 -> 536,84 -> 536,80 -> 536,84
+519,173 -> 524,173
+532,100 -> 537,100
+524,126 -> 524,127 -> 528,127 -> 528,126
+522,84 -> 522,76 -> 522,84 -> 524,84 -> 524,75 -> 524,84 -> 526,84 -> 526,81 -> 526,84 -> 528,84 -> 528,74 -> 528,84 -> 530,84 -> 530,79 -> 530,84 -> 532,84 -> 532,77 -> 532,84 -> 534,84 -> 534,78 -> 534,84 -> 536,84 -> 536,80 -> 536,84
+522,84 -> 522,76 -> 522,84 -> 524,84 -> 524,75 -> 524,84 -> 526,84 -> 526,81 -> 526,84 -> 528,84 -> 528,74 -> 528,84 -> 530,84 -> 530,79 -> 530,84 -> 532,84 -> 532,77 -> 532,84 -> 534,84 -> 534,78 -> 534,84 -> 536,84 -> 536,80 -> 536,84
+529,112 -> 529,116 -> 526,116 -> 526,122 -> 541,122 -> 541,116 -> 535,116 -> 535,112
+522,84 -> 522,76 -> 522,84 -> 524,84 -> 524,75 -> 524,84 -> 526,84 -> 526,81 -> 526,84 -> 528,84 -> 528,74 -> 528,84 -> 530,84 -> 530,79 -> 530,84 -> 532,84 -> 532,77 -> 532,84 -> 534,84 -> 534,78 -> 534,84 -> 536,84 -> 536,80 -> 536,84
+521,148 -> 526,148
+504,167 -> 509,167
+522,84 -> 522,76 -> 522,84 -> 524,84 -> 524,75 -> 524,84 -> 526,84 -> 526,81 -> 526,84 -> 528,84 -> 528,74 -> 528,84 -> 530,84 -> 530,79 -> 530,84 -> 532,84 -> 532,77 -> 532,84 -> 534,84 -> 534,78 -> 534,84 -> 536,84 -> 536,80 -> 536,84
+529,112 -> 529,116 -> 526,116 -> 526,122 -> 541,122 -> 541,116 -> 535,116 -> 535,112
+520,130 -> 520,133 -> 515,133 -> 515,138 -> 533,138 -> 533,133 -> 525,133 -> 525,130
+514,148 -> 519,148
+510,141 -> 515,141
+515,60 -> 515,52 -> 515,60 -> 517,60 -> 517,55 -> 517,60 -> 519,60 -> 519,50 -> 519,60 -> 521,60 -> 521,56 -> 521,60 -> 523,60 -> 523,53 -> 523,60 -> 525,60 -> 525,53 -> 525,60
+515,60 -> 515,52 -> 515,60 -> 517,60 -> 517,55 -> 517,60 -> 519,60 -> 519,50 -> 519,60 -> 521,60 -> 521,56 -> 521,60 -> 523,60 -> 523,53 -> 523,60 -> 525,60 -> 525,53 -> 525,60
+533,108 -> 533,109 -> 538,109 -> 538,108
+524,126 -> 524,127 -> 528,127 -> 528,126
+550,103 -> 555,103
+515,60 -> 515,52 -> 515,60 -> 517,60 -> 517,55 -> 517,60 -> 519,60 -> 519,50 -> 519,60 -> 521,60 -> 521,56 -> 521,60 -> 523,60 -> 523,53 -> 523,60 -> 525,60 -> 525,53 -> 525,60
+501,161 -> 501,152 -> 501,161 -> 503,161 -> 503,157 -> 503,161 -> 505,161 -> 505,155 -> 505,161 -> 507,161 -> 507,154 -> 507,161 -> 509,161 -> 509,155 -> 509,161
+529,103 -> 534,103
+504,26 -> 509,26
+529,112 -> 529,116 -> 526,116 -> 526,122 -> 541,122 -> 541,116 -> 535,116 -> 535,112
+508,170 -> 513,170
+523,63 -> 523,66 -> 515,66 -> 515,71 -> 529,71 -> 529,66 -> 528,66 -> 528,63
+499,34 -> 504,34
+522,47 -> 522,43 -> 522,47 -> 524,47 -> 524,41 -> 524,47 -> 526,47 -> 526,39 -> 526,47 -> 528,47 -> 528,39 -> 528,47
+529,112 -> 529,116 -> 526,116 -> 526,122 -> 541,122 -> 541,116 -> 535,116 -> 535,112
+495,32 -> 500,32
+507,148 -> 512,148
+515,60 -> 515,52 -> 515,60 -> 517,60 -> 517,55 -> 517,60 -> 519,60 -> 519,50 -> 519,60 -> 521,60 -> 521,56 -> 521,60 -> 523,60 -> 523,53 -> 523,60 -> 525,60 -> 525,53 -> 525,60
+501,161 -> 501,152 -> 501,161 -> 503,161 -> 503,157 -> 503,161 -> 505,161 -> 505,155 -> 505,161 -> 507,161 -> 507,154 -> 507,161 -> 509,161 -> 509,155 -> 509,161
+531,87 -> 531,88 -> 543,88
+536,103 -> 541,103
+501,161 -> 501,152 -> 501,161 -> 503,161 -> 503,157 -> 503,161 -> 505,161 -> 505,155 -> 505,161 -> 507,161 -> 507,154 -> 507,161 -> 509,161 -> 509,155 -> 509,161
+522,84 -> 522,76 -> 522,84 -> 524,84 -> 524,75 -> 524,84 -> 526,84 -> 526,81 -> 526,84 -> 528,84 -> 528,74 -> 528,84 -> 530,84 -> 530,79 -> 530,84 -> 532,84 -> 532,77 -> 532,84 -> 534,84 -> 534,78 -> 534,84 -> 536,84 -> 536,80 -> 536,84
+522,47 -> 522,43 -> 522,47 -> 524,47 -> 524,41 -> 524,47 -> 526,47 -> 526,39 -> 526,47 -> 528,47 -> 528,39 -> 528,47
+498,30 -> 503,30
+492,34 -> 497,34
+529,112 -> 529,116 -> 526,116 -> 526,122 -> 541,122 -> 541,116 -> 535,116 -> 535,112

inputs/day15.tt

@@ -0,0 +1,36 @@
+Sensor at x=13820, y=3995710: closest beacon is at x=1532002, y=3577287
+Sensor at x=3286002, y=2959504: closest beacon is at x=3931431, y=2926694
+Sensor at x=3654160, y=2649422: closest beacon is at x=3702627, y=2598480
+Sensor at x=3702414, y=2602790: closest beacon is at x=3702627, y=2598480
+Sensor at x=375280, y=2377181: closest beacon is at x=2120140, y=2591883
+Sensor at x=3875726, y=2708666: closest beacon is at x=3931431, y=2926694
+Sensor at x=3786107, y=2547075: closest beacon is at x=3702627, y=2598480
+Sensor at x=2334266, y=3754737: closest beacon is at x=2707879, y=3424224
+Sensor at x=1613400, y=1057722: closest beacon is at x=1686376, y=-104303
+Sensor at x=3305964, y=2380628: closest beacon is at x=3702627, y=2598480
+Sensor at x=1744420, y=3927424: closest beacon is at x=1532002, y=3577287
+Sensor at x=3696849, y=2604845: closest beacon is at x=3702627, y=2598480
+Sensor at x=2357787, y=401688: closest beacon is at x=1686376, y=-104303
+Sensor at x=2127900, y=1984887: closest beacon is at x=2332340, y=2000000
+Sensor at x=3705551, y=2604421: closest beacon is at x=3702627, y=2598480
+Sensor at x=1783014, y=2978242: closest beacon is at x=2120140, y=2591883
+Sensor at x=2536648, y=2910642: closest beacon is at x=2707879, y=3424224
+Sensor at x=3999189, y=2989409: closest beacon is at x=3931431, y=2926694
+Sensor at x=3939169, y=2382534: closest beacon is at x=3702627, y=2598480
+Sensor at x=2792378, y=2002602: closest beacon is at x=2332340, y=2000000
+Sensor at x=3520934, y=3617637: closest beacon is at x=2707879, y=3424224
+Sensor at x=2614525, y=1628105: closest beacon is at x=2332340, y=2000000
+Sensor at x=2828931, y=3996545: closest beacon is at x=2707879, y=3424224
+Sensor at x=2184699, y=2161391: closest beacon is at x=2332340, y=2000000
+Sensor at x=2272873, y=1816621: closest beacon is at x=2332340, y=2000000
+Sensor at x=1630899, y=3675405: closest beacon is at x=1532002, y=3577287
+Sensor at x=3683190, y=2619409: closest beacon is at x=3702627, y=2598480
+Sensor at x=180960, y=185390: closest beacon is at x=187063, y=-1440697
+Sensor at x=1528472, y=3321640: closest beacon is at x=1532002, y=3577287
+Sensor at x=3993470, y=2905566: closest beacon is at x=3931431, y=2926694
+Sensor at x=1684313, y=20931: closest beacon is at x=1686376, y=-104303
+Sensor at x=2547761, y=2464195: closest beacon is at x=2120140, y=2591883
+Sensor at x=3711518, y=845968: closest beacon is at x=3702627, y=2598480
+Sensor at x=3925049, y=2897039: closest beacon is at x=3931431, y=2926694
+Sensor at x=1590740, y=3586256: closest beacon is at x=1532002, y=3577287
+Sensor at x=1033496, y=3762565: closest beacon is at x=1532002, y=3577287

inputs/day16.tt

@@ -0,0 +1,60 @@
+Valve XB has flow rate=0; tunnels lead to valves WZ, LE
+Valve BM has flow rate=0; tunnels lead to valves PL, RI
+Valve GC has flow rate=0; tunnels lead to valves HN, IT
+Valve RM has flow rate=0; tunnels lead to valves ZQ, YL
+Valve ZM has flow rate=5; tunnels lead to valves SN, KE, UW, MY, GW
+Valve UH has flow rate=0; tunnels lead to valves HM, HN
+Valve GW has flow rate=0; tunnels lead to valves LE, ZM
+Valve HN has flow rate=19; tunnels lead to valves UW, UH, GL, WZ, GC
+Valve VT has flow rate=0; tunnels lead to valves ZD, PE
+Valve VI has flow rate=0; tunnels lead to valves JS, AA
+Valve YL has flow rate=12; tunnels lead to valves PM, MH, RM, CM
+Valve LA has flow rate=0; tunnels lead to valves SN, IY
+Valve CM has flow rate=0; tunnels lead to valves YL, UL
+Valve JI has flow rate=24; tunnels lead to valves UV, WH, XW, OJ
+Valve ZD has flow rate=25; tunnels lead to valves VB, XW, VT
+Valve VB has flow rate=0; tunnels lead to valves QX, ZD
+Valve FO has flow rate=0; tunnels lead to valves WH, PE
+Valve JS has flow rate=0; tunnels lead to valves VI, IY
+Valve RI has flow rate=0; tunnels lead to valves PE, BM
+Valve XD has flow rate=14; tunnel leads to valve CP
+Valve ES has flow rate=11; tunnels lead to valves GU, WU
+Valve WZ has flow rate=0; tunnels lead to valves XB, HN
+Valve HW has flow rate=0; tunnels lead to valves QY, LE
+Valve KE has flow rate=0; tunnels lead to valves AA, ZM
+Valve IY has flow rate=22; tunnels lead to valves JS, AB, LA, IT
+Valve XW has flow rate=0; tunnels lead to valves ZD, JI
+Valve BE has flow rate=0; tunnels lead to valves AB, LE
+Valve QY has flow rate=23; tunnels lead to valves AM, HW, MY
+Valve MH has flow rate=0; tunnels lead to valves YL, AM
+Valve IT has flow rate=0; tunnels lead to valves GC, IY
+Valve DA has flow rate=0; tunnels lead to valves QR, CP
+Valve PM has flow rate=0; tunnels lead to valves LE, YL
+Valve WU has flow rate=0; tunnels lead to valves SM, ES
+Valve UL has flow rate=0; tunnels lead to valves CM, QR
+Valve SM has flow rate=13; tunnel leads to valve WU
+Valve XC has flow rate=0; tunnels lead to valves ZJ, AA
+Valve OJ has flow rate=0; tunnels lead to valves GI, JI
+Valve SN has flow rate=0; tunnels lead to valves LA, ZM
+Valve WH has flow rate=0; tunnels lead to valves JI, FO
+Valve UW has flow rate=0; tunnels lead to valves HN, ZM
+Valve HM has flow rate=0; tunnels lead to valves UH, PE
+Valve AB has flow rate=0; tunnels lead to valves BE, IY
+Valve QR has flow rate=8; tunnels lead to valves WW, UL, DA
+Valve UV has flow rate=0; tunnels lead to valves JI, FF
+Valve ZQ has flow rate=20; tunnel leads to valve RM
+Valve ZJ has flow rate=0; tunnels lead to valves PE, XC
+Valve GL has flow rate=0; tunnels lead to valves HN, PL
+Valve CP has flow rate=0; tunnels lead to valves DA, XD
+Valve AM has flow rate=0; tunnels lead to valves QY, MH
+Valve PL has flow rate=17; tunnels lead to valves GL, YE, BM, FF, QX
+Valve YE has flow rate=0; tunnels lead to valves PL, AA
+Valve PE has flow rate=4; tunnels lead to valves FO, RI, ZJ, VT, HM
+Valve MY has flow rate=0; tunnels lead to valves QY, ZM
+Valve QX has flow rate=0; tunnels lead to valves VB, PL
+Valve GI has flow rate=0; tunnels lead to valves OJ, AA
+Valve WW has flow rate=0; tunnels lead to valves GU, QR
+Valve FF has flow rate=0; tunnels lead to valves UV, PL
+Valve LE has flow rate=6; tunnels lead to valves HW, GW, XB, BE, PM
+Valve GU has flow rate=0; tunnels lead to valves ES, WW
+Valve AA has flow rate=0; tunnels lead to valves KE, GI, VI, YE, XC

inputs/day17.tt

@@ -0,0 +1 @@
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inputs/day5.tt

@@ -0,0 +1,511 @@
+[B]                     [N]     [H]
+[V]         [P] [T]     [V]     [P]
+[W]     [C] [T] [S]     [H]     [N]
+[T]     [J] [Z] [M] [N] [F]     [L]
+[Q]     [W] [N] [J] [T] [Q] [R] [B]
+[N] [B] [Q] [R] [V] [F] [D] [F] [M]
+[H] [W] [S] [J] [P] [W] [L] [P] [S]
+[D] [D] [T] [F] [G] [B] [B] [H] [Z]
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inputs/day6.tt

@@ -0,0 +1 @@
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inputs/day8.tt

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src/day1.ml

@@ -1,4 +1,5 @@
-let part1 lines =
+let part1 () =
+  let lines = Utils.lines_of_input 1 in
   let rec most_calories most current lines =
     match lines with
     | [] -> most
@@ -10,7 +11,8 @@ let part1 lines =
   most_calories 0 0 lines
 ;;
 
-let part2 lines =
+let part2 () =
+  let lines = Utils.lines_of_input 1 in
   let accum_calories elves calories =
     match elves, calories with
     | elves, "" -> 0 :: elves
@@ -23,9 +25,12 @@ let part2 lines =
   | _ -> failwith "wtf"
 ;;
 
-let print () =
-  let lines = Utils.lines_of_input 1 in
-  Printf.(
-    printf "Day 1.1: %d\n" @@ part1 lines;
-    printf "Day 1.2: %d\n" @@ part2 lines)
+let%expect_test "Day 1.1" =
+  Printf.printf "%d" @@ part1 ();
+  [%expect {| 75622 |}]
+;;
+
+let%expect_test "Day 1.2" =
+  Printf.printf "%d" @@ part2 ();
+  [%expect {| 213159 |}]
 ;;

src/day10.ml

@@ -0,0 +1,57 @@
+open Containers
+
+let parse_lines () =
+  let lines = Utils.lines_of_input 10 in
+  let _, state_history =
+    List.fold_flat_map
+      (fun (cycle, reg) instruction ->
+        match String.split ~by:" " instruction with
+        | [ "noop" ] -> (cycle + 1, reg), [ cycle + 1, reg ]
+        | [ "addx"; num ] ->
+          let num = int_of_string num in
+          (cycle + 2, reg + num), [ cycle + 1, reg; cycle + 2, reg ]
+        | _ -> failwith @@ Printf.sprintf "failed to parse '%s'" instruction)
+      (0, 1)
+      lines
+  in
+  state_history
+;;
+
+let part1 () =
+  let history = parse_lines () in
+  history
+  |> List.find_all (fun (cycle, _) ->
+    match cycle with
+    | 20 | 60 | 100 | 140 | 180 | 220 -> true
+    | _ -> false)
+  |> List.fold_left (fun acc (cycle, reg) -> acc + (cycle * reg)) 0
+;;
+
+let part2 () =
+  let screen_width = 40 in
+  let history = parse_lines () in
+  history
+  |> List.map (fun (cycle, reg) ->
+    let column = Int.(cycle mod screen_width) in
+    let sprite_dist = abs @@ (reg + 1 - column) in
+    if sprite_dist <= 1 then '#' else ' ')
+  |> List.chunks 40
+  |> List.map String.of_list
+  |> List.iter Fun.(print_string %> print_newline)
+;;
+
+let%expect_test "Day 10.1" =
+  Printf.printf "%d" @@ part1 ();
+  [%expect {| 14760 |}]
+;;
+
+let%expect_test "Day 10.2" =
+  part2 ();
+  [%expect {|
+    #### ####  ##  #### ###  #  # ###  #####
+    #    #    #  # #    #  # #  # #  # #   #
+    ###  ###  #    ###  #  # #  # #  # ### #
+    #    #    # ## #    ###  #  # ###  #
+    #    #    #  # #    # #  #  # # #  #
+    #### #     ### #### #  #  ##  #  # #### |}]
+;;

src/day11.ml

@@ -0,0 +1,87 @@
+open Containers
+
+type monkey =
+  { mutable items : int list
+  ; mutable inspected : int
+  ; operation : int -> int
+  ; test : int -> int
+  ; test_num : int
+  }
+
+let parse_monkeys () =
+  let lines = Utils.lines_of_input 11 in
+  let rec parse lines monkeys =
+    let lines = List.drop_while (String.equal "") lines in
+    let lines, rest = List.take_drop_while Fun.(String.equal "" %> not) lines in
+    let lines = List.map Fun.(String.trim %> String.split ~by:" ") lines in
+    match lines with
+    | [ [ "Monkey"; _ ]
+      ; "Starting" :: "items:" :: items
+      ; [ "Operation:"; "new"; "="; "old"; op; op_num ]
+      ; [ "Test:"; "divisible"; "by"; test_num ]
+      ; [ "If"; "true:"; "throw"; "to"; "monkey"; if_true ]
+      ; [ "If"; "false:"; "throw"; "to"; "monkey"; if_false ]
+      ] ->
+      let items =
+        List.map Fun.(String.replace ~which:`All ~sub:"," ~by:"" %> int_of_string) items
+      in
+      let op = if String.equal op "+" then ( + ) else ( * ) in
+      let operation =
+        match op_num with
+        | "old" -> fun old -> op old old
+        | num -> fun old -> op old @@ int_of_string num
+      in
+      let test_num = int_of_string test_num in
+      let if_true = int_of_string if_true in
+      let if_false = int_of_string if_false in
+      let test score = if Int.(score mod test_num) = 0 then if_true else if_false in
+      let monkey = { items; operation; test; test_num; inspected = 0 } in
+      parse rest (monkey :: monkeys)
+    | _ -> monkeys
+  in
+  Array.of_list @@ List.rev @@ parse lines []
+;;
+
+let throw item monkey = monkey.items <- List.append [ item ] monkey.items
+
+let round monkies ~manageable =
+  let divisor = Array.fold_left (fun acc monkey -> acc * monkey.test_num) 1 monkies in
+  let destress score = if manageable then score / 3 else Int.(score mod divisor) in
+  monkies
+  |> Array.iter (fun monkey ->
+    monkey.items
+    |> List.iter (fun item ->
+      let item = destress @@ monkey.operation item in
+      let throw_to = monkey.test item in
+      throw item monkies.(throw_to));
+    monkey.inspected <- monkey.inspected + List.length monkey.items;
+    monkey.items <- [])
+;;
+
+let solve rounds ~manageable =
+  let monkies = parse_monkeys () in
+  for _ = 1 to rounds do
+    round monkies ~manageable
+  done;
+  monkies
+  |> Array.to_list
+  |> List.map (fun monkey -> monkey.inspected)
+  |> List.sort Int.compare
+  |> List.rev
+  |> List.take 2
+  |> List.reduce ( * )
+  |> Option.get_exn_or "aoc goofed up the input"
+;;
+
+let part1 () = solve 20 ~manageable:true
+let part2 () = solve 10_000 ~manageable:false
+
+let%expect_test "Day 11.1" =
+  Printf.printf "%d" @@ part1 ();
+  [%expect {| 56350 |}]
+;;
+
+let%expect_test "Day 11.2" =
+  Printf.printf "%d" @@ part2 ();
+  [%expect {| 13954061248 |}]
+;;

src/day12.ml

@@ -0,0 +1,100 @@
+open Containers
+
+type node =
+  { char : char
+  ; mutable visited : bool
+  ; mutable distance : int
+  }
+[@@deriving show]
+
+let parse_grid start_anywhere =
+  let start_nodes = ref [] in
+  let end_node = ref @@ Vec2.origin in
+  let grid =
+    Utils.lines_of_input 12
+    |> Grid.of_lines (fun char -> { char; visited = false; distance = Int.max_int })
+  in
+  Grid.iter grid (fun pos ->
+    let node = Grid.at_e grid pos in
+    match node.char with
+    | 'E' -> end_node := pos
+    | 'S' -> start_nodes := pos :: !start_nodes
+    | 'a' when start_anywhere -> start_nodes := pos :: !start_nodes
+    | _ -> ());
+  grid, !end_node, !start_nodes
+;;
+
+let reachable f t =
+  let height c =
+    match c with
+    | 'S' -> 'a'
+    | 'E' -> 'z'
+    | c -> c
+  in
+  Char.compare (height f) (height t) >= -1
+;;
+
+let get_neighbors grid node_pos =
+  let node = Grid.at_e grid node_pos in
+  Vec2.directions
+  |> Iter.of_list
+  |> Iter.filter_map (fun dir ->
+    let neighbor_pos = Vec2.(node_pos + dir) in
+    match Grid.at grid neighbor_pos with
+    | Some neighbor when reachable node.char neighbor.char -> Some neighbor_pos
+    | _ -> None)
+;;
+
+let path_distance grid goal start_nodes =
+  let set_info position (dist, visited) =
+    let node = Grid.at_e grid position in
+    node.distance <- dist;
+    node.visited <- visited
+  in
+  let get_info position =
+    let { char = _; distance; visited } = Grid.at_e grid position in
+    distance, visited
+  in
+  Utils.djikstra
+    ~set_info
+    ~get_info
+    ~eq:Vec2.( = )
+    ~get_weight:(fun _ _ -> 1)
+    ~get_neighbors:(get_neighbors grid)
+    ~goal
+    ~start_nodes
+  |> Option.get_exn_or "couldn't find"
+;;
+
+let%expect_test "Day 12.1" =
+  let grid, goal, start_nodes = parse_grid false in
+  Printf.printf "%i" @@ path_distance grid (Some goal) start_nodes;
+  [%expect {| 497 |}]
+;;
+
+let%expect_test "Day 12.2" =
+  let grid, goal, start_nodes = parse_grid true in
+  Printf.printf "%i" @@ path_distance grid (Some goal) start_nodes;
+  [%expect {| 492 |}]
+;;
+
+let%expect_test "Day 12 test" =
+  let grid, goal, start_nodes = parse_grid false in
+  let _ = path_distance grid None start_nodes in
+  let print_dist_to pos =
+    let node = Option.get_exn_or "invalid pos!" grid.Grid.%(pos) in
+    Printf.printf "%s %c %i\n" (Vec2.show pos) node.char node.distance
+  in
+  print_dist_to goal;
+  print_dist_to Vec2.(goal + right);
+  print_dist_to Vec2.(goal + down);
+  print_dist_to Vec2.(of_tuple (121, 23));
+  print_dist_to Vec2.(origin + right);
+  [%expect
+    {|
+    (149, 20) E 497
+    (150, 20) z 498
+    (149, 21) y 496
+    (121, 23) a 138
+    (1, 0) b 21 |}]
+;;

src/day13.ml

@@ -0,0 +1,55 @@
+open Containers
+
+module Packet = struct
+  type t =
+    | I of int
+    | L of t list
+  [@@deriving show { with_path = false }]
+
+  let of_str line =
+    let open Utils.Parse in
+    let int = int >>= fun i -> return @@ I i in
+    let packet =
+      fix (fun packet ->
+        let lb, delimited, rb = char '[', sep_by (char ','), char ']' in
+        let list = lb *> delimited packet <* rb >>= fun p -> return @@ L p <?> "list" in
+        choice [ int; list ])
+      <?> "packet"
+    in
+    Result.get_or_failwith @@ parse_string ~consume:All packet line
+  ;;
+
+  let rec compare a b =
+    match a, b with
+    | I a, I b -> Int.compare a b
+    | L a, L b -> List.compare compare a b
+    | (I _ as a), (L _ as b) -> compare (L [ a ]) b
+    | (L _ as a), (I _ as b) -> compare a (L [ b ])
+  ;;
+end
+
+let%expect_test "Day 13.1" =
+  Utils.lines_of_input 13
+  |> List.filter Fun.(not % String.is_empty)
+  |> List.map Packet.of_str
+  |> List.chunks 2
+  |> List.mapi (fun i packets ->
+    match packets with
+    | [ a; b ] when Packet.compare a b < 0 -> i + 1
+    | _ -> 0)
+  |> List.reduce_exn ( + )
+  |> print_int;
+  [%expect {| 6272 |}]
+;;
+
+let%expect_test "Day 13.2" =
+  Utils.lines_of_input 13
+  |> List.filter Fun.(not % String.is_empty)
+  |> List.map (fun line -> false, Packet.of_str line)
+  |> List.append [ true, Packet.of_str "[[2]]"; true, Packet.of_str "[[6]]" ]
+  |> List.sort (fun (_, a) (_, b) -> Packet.compare a b)
+  |> List.mapi (fun i (is_divider, _) -> if is_divider then i + 1 else 1)
+  |> List.reduce_exn ( * )
+  |> print_int;
+  [%expect {| 22288 |}]
+;;

src/day14.ml

@@ -0,0 +1,190 @@
+open Containers
+
+type tile =
+  | Empty
+  | Rock
+  | Sand
+  | Start
+  | Path_D
+  | Path_L
+  | Path_R
+
+let char_of_tile _ = function
+  | Empty -> '-'
+  | Rock -> '#'
+  | Sand -> 'o'
+  | Start -> 'v'
+  | Path_D -> '|'
+  | Path_L -> '/'
+  | Path_R -> '\\'
+;;
+
+let is_sand = function
+  | Sand -> true
+  | _ -> false
+;;
+
+let parse_line line =
+  let open Utils.Parse in
+  let vec = Vec2.of_tuple <$> both int (char ',' *> int) in
+  let vec_list = sep_by (string " -> ") vec in
+  Result.get_or_failwith @@ parse_string ~consume:All vec_list line
+;;
+
+let draw_rocks grid points =
+  let open Grid in
+  let _ =
+    points
+    |> List.reduce (fun a b ->
+      iter_region grid a b (fun pos -> grid.%(pos) <- Rock);
+      b)
+  in
+  ()
+;;
+
+let parse_grid lines start =
+  let points = Iter.map Fun.(parse_line %> Iter.of_list) lines in
+  let Vec2.{ x = lx; y = ly }, Vec2.{ x = hx; y = hy } =
+    points |> Iter.flatten |> Iter.cons start |> Vec2.find_bounds 0
+  in
+  let pad_floor = 1 in
+  let pad_x = 2 in
+  let height = 1 + hy - ly + pad_floor in
+  let lx = min lx (start.x - height) in
+  let hx = max hx (start.x + height) in
+  let width = 1 + hx - lx + (pad_x * 2) in
+  let extra = Vec2.of_tuple (lx - pad_x, ly) in
+  let start = Vec2.(start - extra) in
+  let open Grid in
+  let grid = init ~width ~height (fun _ -> Empty) in
+  grid.%(start) <- Start;
+  Iter.iter
+    Fun.(Iter.map (fun point -> Vec2.(point - extra)) %> Iter.to_list %> draw_rocks grid)
+    points;
+  grid, start
+;;
+
+type is_done =
+  | Continue
+  | Done
+
+let rec drop_sand_abyss draw_path grid start =
+  let d = Vec2.(start + down) in
+  let l = Vec2.(d + left) in
+  let r = Vec2.(d + right) in
+  let open Grid in
+  match grid.%(l), grid.%(d), grid.%(r) with
+  | _, None, _ -> Done
+  | _, Some Empty, _ ->
+    if draw_path then grid.%(d) <- Path_D;
+    drop_sand_abyss draw_path grid d
+  | Some Empty, _, _ ->
+    if draw_path then grid.%(l) <- Path_L;
+    drop_sand_abyss draw_path grid l
+  | _, _, Some Empty ->
+    if draw_path then grid.%(r) <- Path_R;
+    drop_sand_abyss draw_path grid r
+  | _, _, _ ->
+    (match grid.%(start) with
+     | Some Empty ->
+       grid.%(start) <- Sand;
+       Continue
+     | _ -> failwith "oh no!")
+;;
+
+let rec drop_sand_floor grid start =
+  let d = Vec2.(start + down) in
+  let l = Vec2.(d + left) in
+  let r = Vec2.(d + right) in
+  let open Grid in
+  match grid.%(l), grid.%(d), grid.%(r) with
+  | _, Some Empty, _ -> drop_sand_floor grid d
+  | Some Empty, _, _ -> drop_sand_floor grid l
+  | _, _, Some Empty -> drop_sand_floor grid r
+  | _, _, _ ->
+    (match grid.%(start) with
+     | Some Empty ->
+       grid.%(start) <- Sand;
+       Continue
+     | Some Start ->
+       grid.%(start) <- Sand;
+       Done
+     | _ -> failwith "oh no!")
+;;
+
+let rec drop_all_sand drop grid start =
+  match drop grid start with
+  | Continue -> drop_all_sand drop grid start
+  | Done -> ()
+;;
+
+let%expect_test "Day 14.1 example" =
+  let lines =
+    Iter.of_list [ "498,4 -> 498,6 -> 496,6"; "503,4 -> 502,4 -> 502,9 -> 494,9" ]
+  in
+  let start = Vec2.of_tuple (500, 0) in
+  let grid, start = parse_grid lines start in
+  drop_all_sand (drop_sand_abyss false) grid start;
+  let _ = drop_sand_abyss true grid start in
+  let count = Grid.count grid is_sand in
+  Printf.printf "%i grains\n%s" count @@ Grid.draw grid char_of_tile;
+  [%expect
+    {|
+    24 grains
+    -------------v-------------
+    -------------|-------------
+    ------------/o-------------
+    -----------/ooo------------
+    ----------/#ooo##----------
+    ---------/o#ooo#-----------
+    --------/###ooo#-----------
+    --------|--oooo#-----------
+    -------/o-ooooo#-----------
+    ------/#########-----------
+    ------|-------------------- |}]
+;;
+
+let%expect_test "Day 14.2 example" =
+  let lines =
+    Iter.of_list [ "498,4 -> 498,6 -> 496,6"; "503,4 -> 502,4 -> 502,9 -> 494,9" ]
+  in
+  let start = Vec2.of_tuple (500, 0) in
+  let grid, start = parse_grid lines start in
+  drop_all_sand drop_sand_floor grid start;
+  let count = Grid.count grid is_sand in
+  Printf.printf "%i grains\n%s" count @@ Grid.draw grid char_of_tile;
+  [%expect
+    {|
+    93 grains
+    -------------o-------------
+    ------------ooo------------
+    -----------ooooo-----------
+    ----------ooooooo----------
+    ---------oo#ooo##o---------
+    --------ooo#ooo#ooo--------
+    -------oo###ooo#oooo-------
+    ------oooo-oooo#ooooo------
+    -----oooooooooo#oooooo-----
+    ----ooo#########ooooooo----
+    ---ooooo-------ooooooooo--- |}]
+;;
+
+let%expect_test "Day 14.1" =
+  let lines = Iter.of_list @@ Utils.lines_of_input 14 in
+  let start = Vec2.of_tuple (500, 0) in
+  let grid, start = parse_grid lines start in
+  drop_all_sand (drop_sand_abyss false) grid start;
+  let count = Grid.count grid is_sand in
+  Printf.printf "%i" count;
+  [%expect {| 683 |}]
+;;
+
+let%expect_test "Day 14.2" =
+  let lines = Iter.of_list @@ Utils.lines_of_input 14 in
+  let start = Vec2.of_tuple (500, 0) in
+  let grid, start = parse_grid lines start in
+  drop_all_sand drop_sand_floor grid start;
+  let count = Grid.count grid is_sand in
+  Printf.printf "%i" count;
+  [%expect {| 28821 |}]
+;;

src/day15.ml

@@ -0,0 +1,167 @@
+open Containers
+
+let example_lines =
+  [ "Sensor at x=2, y=18: closest beacon is at x=-2, y=15"
+  ; "Sensor at x=9, y=16: closest beacon is at x=10, y=16"
+  ; "Sensor at x=13, y=2: closest beacon is at x=15, y=3"
+  ; "Sensor at x=12, y=14: closest beacon is at x=10, y=16"
+  ; "Sensor at x=10, y=20: closest beacon is at x=10, y=16"
+  ; "Sensor at x=14, y=17: closest beacon is at x=10, y=16"
+  ; "Sensor at x=8, y=7: closest beacon is at x=2, y=10"
+  ; "Sensor at x=2, y=0: closest beacon is at x=2, y=10"
+  ; "Sensor at x=0, y=11: closest beacon is at x=2, y=10"
+  ; "Sensor at x=20, y=14: closest beacon is at x=25, y=17"
+  ; "Sensor at x=17, y=20: closest beacon is at x=21, y=22"
+  ; "Sensor at x=16, y=7: closest beacon is at x=15, y=3"
+  ; "Sensor at x=14, y=3: closest beacon is at x=15, y=3"
+  ; "Sensor at x=20, y=1: closest beacon is at x=15, y=3"
+  ]
+;;
+
+type sensor =
+  { pos : Vec2.t
+  ; beacon : Vec2.t
+  ; dist : int
+  }
+[@@deriving show { with_path = false }]
+
+let taxicab_dist a b =
+  let x, y = Vec2.(abs (a - b) |> to_tuple) in
+  x + y
+;;
+
+let parse_sensor line =
+  match List.map int_of_string Re.(matches (Pcre.regexp {|-?\d+|}) line) with
+  | [ sx; sy; bx; by ] ->
+    let pos, beacon = Vec2.(of_tuple (sx, sy), of_tuple (bx, by)) in
+    { pos; beacon; dist = taxicab_dist pos beacon }
+  | _ -> failwith "parse error"
+;;
+
+let could_be_beacon sensors ignore_known pos =
+  sensors
+  |> Iter.fold_while
+       (fun _ s ->
+         let d = taxicab_dist pos s.pos in
+         if d <= s.dist && (ignore_known || not Vec2.(pos = s.beacon))
+         then false, `Stop
+         else true, `Continue)
+       true
+;;
+
+(*{[
+    equation for line
+      y = m*x + c
+
+    beacon range boundaries are made up of four lines:
+      slope  1 passing thru bx + dist + 1, by
+      slope  1 passing thru bx - dist - 1, by
+      slope -1 passing thru bx + dist + 1, by
+      slope -1 passing thru bx - dist - 1, by
+
+    to find the constant given a slope, plug a point into
+      c = y - m*x
+
+    constants are stored separately for boundaries with positive and negative
+    slope so that they can be handled separately
+      p1 = y - bx - dist - 1
+      p2 = y - bx + dist + 1
+      n1 = y + bx + dist + 1
+      n2 = y + bx - dist - 1
+  ]}*)
+let get_consts sensors extra =
+  sensors
+  |> Iter.fold
+       (fun (p_slope_consts, n_slope_consts) { pos; beacon = _; dist } ->
+         let p1 = pos.y - pos.x + dist + extra in
+         let p2 = pos.y - pos.x - dist - extra in
+         let n1 = pos.y + pos.x + dist + extra in
+         let n2 = pos.y + pos.x - dist - extra in
+         Iter.(
+           ( append p_slope_consts (of_list [ p1; p2 ])
+           , append n_slope_consts (of_list [ n1; n2 ]) )))
+       (Iter.empty, Iter.empty)
+;;
+
+let solve_part_1 lines scan_y =
+  let sensors = lines |> Iter.of_list |> Iter.map parse_sensor in
+  let p_slope_consts, n_slope_consts = get_consts sensors 0 in
+  (*{[
+      for a known y to intersect with a positive slope boundary:
+        y = x + p
+        x = y - p
+
+      and for a negative slope boundary:
+        y = -x + n
+        x = n - y
+    ]}*)
+  let intersection_xs =
+    Iter.append
+      (Iter.map (fun p -> scan_y - p) p_slope_consts)
+      (Iter.map (fun n -> n - scan_y) n_slope_consts)
+    |> Iter.sort_uniq ~cmp:Int.compare
+  in
+  let check x = could_be_beacon sensors false @@ Vec2.of_tuple (x, scan_y) in
+  let rec count_not_beacons count xs =
+    match xs with
+    | x :: next :: rest ->
+      (* if there is a region [x+1, next), the value of check
+         is the same for each point within it. intersection points
+         must be checked separately from the regions between them  *)
+      let intersection = if check x then 0 else 1 in
+      let region = if x + 1 < next && check (x + 1) then 0 else next - (x + 1) in
+      count_not_beacons (count + intersection + region) (next :: rest)
+    | _ -> count
+  in
+  count_not_beacons 0 @@ Iter.to_list intersection_xs
+;;
+
+let%expect_test "Day 15.1 example" =
+  Printf.printf "%i\n" @@ solve_part_1 example_lines 10;
+  [%expect {| 26 |}]
+;;
+
+let%expect_test "Day 15.1" =
+  Printf.printf "%i\n" @@ solve_part_1 (Utils.lines_of_input 15) 2000000;
+  [%expect {| 5525990 |}]
+;;
+
+let solve_part_2 lines range mult =
+  let sensors = lines |> Iter.of_list |> Iter.map parse_sensor in
+  let in_bounds = Vec2.(in_bounds origin @@ of_tuple (range, range)) in
+  let p_slope_consts, n_slope_consts = get_consts sensors 1 in
+  (*{[
+      boundaries only itersect if they have opposite slope.
+      to find the intersection, set equations to be equal and solve.
+         y =  x + p
+         y = -x + n        // set equal
+         x + p = -x + n    // add x and subtract p
+         2x = n - p        // divide 2
+      -> x = (n - p)/2     // substitute x into original
+         y = (n - p)/2 + p // multiply 2
+         2y = n + p        // div 2
+      -> y = (n + p)/2
+    ]}*)
+  let point =
+    Iter.product p_slope_consts n_slope_consts
+    |> Iter.fold_while
+         (fun _ (p, n) ->
+           let i = Vec2.of_tuple ((n - p) / 2, (n + p) / 2) in
+           if in_bounds i && could_be_beacon sensors true i
+           then Some i, `Stop
+           else None, `Continue)
+         None
+    |> Option.get_exn_or "no distress beacon found :("
+  in
+  (mult * point.x) + point.y
+;;
+
+let%expect_test "Day 15.2 example" =
+  Printf.printf "%i\n" @@ solve_part_2 example_lines 20 4000000;
+  [%expect {| 56000011 |}]
+;;
+
+let%expect_test "Day 15.2" =
+  Printf.printf "%i\n" @@ solve_part_2 (Utils.lines_of_input 15) 4000000 4000000;
+  [%expect {| 11756174628223 |}]
+;;

src/day16.ml

@@ -0,0 +1,141 @@
+open Containers
+
+let example_lines =
+  String.lines
+    {|Valve AA has flow rate=0; tunnels lead to valves DD, II, BB
+Valve BB has flow rate=13; tunnels lead to valves CC, AA
+Valve CC has flow rate=2; tunnels lead to valves DD, BB
+Valve DD has flow rate=20; tunnels lead to valves CC, AA, EE
+Valve EE has flow rate=3; tunnels lead to valves FF, DD
+Valve FF has flow rate=0; tunnels lead to valves EE, GG
+Valve GG has flow rate=0; tunnels lead to valves FF, HH
+Valve HH has flow rate=22; tunnel leads to valve GG
+Valve II has flow rate=0; tunnels lead to valves AA, JJ
+Valve JJ has flow rate=21; tunnel leads to valve II
+|}
+;;
+
+type valve =
+  { flow : int
+  ; mask : int
+  }
+
+let parse_valves lines =
+  let rooms = Hashtbl.create 100 in
+  lines
+  |> List.iter (fun line ->
+    let int_matches = List.map int_of_string Re.(matches (Pcre.regexp {|\d+|}) line) in
+    let valve_matches = Re.(matches (Pcre.regexp {|[A-Z]{2}|}) line) in
+    match int_matches, valve_matches with
+    | [ flow ], name :: tunnels -> Hashtbl.add rooms name (flow, tunnels)
+    | _ -> failwith "parse error");
+  let valves =
+    Hashtbl.to_list rooms
+    |> List.filter (fun (_, (flow, _)) -> flow > 0)
+    |> List.mapi (fun i (name, (flow, _)) ->
+      let mask = Int.(1 lsl i) in
+      name, { flow; mask })
+  in
+  let distances = Hashtbl.create 100 in
+  valves
+  |> List.map (fun (valve, _) -> valve)
+  |> List.cons "AA"
+  |> List.iter (fun from ->
+    let dist_of =
+      Fun.(
+        Utils.djikstra_hash
+          ~get_weight:(fun _ _ -> 1)
+          ~get_neighbors:(fun room ->
+            match Hashtbl.get rooms room with
+            | Some (_, tunnels) -> Iter.of_list tunnels
+            | None -> failwith "sad")
+          ~start_nodes:[ from ]
+          ()
+        %> Option.get_exn_or "big sad")
+    in
+    valves
+    |> List.remove_assoc ~eq:String.equal from
+    |> List.iter (fun (valve, _) ->
+      Hashtbl.replace distances (from, valve) (dist_of valve)));
+  let get_dist f t =
+    match Hashtbl.get distances (f, t) with
+    | Some dist -> dist
+    | None -> failwith @@ Printf.sprintf "cant find distance %s -> %s" f t
+  in
+  valves, get_dist
+;;
+
+let traverse
+  get_dist
+  (valves : (string * valve) list)
+  ?(current = "AA")
+  ?(released = 0)
+  ?(opened = 0)
+  time
+  =
+  let states = Hashtbl.create 1000 in
+  let rec traverse' current time released opened =
+    Hashtbl.update
+      states
+      ~f:(fun _ current ->
+        match current with
+        | Some r when r >= released -> Some r
+        | _ -> Some released)
+      ~k:opened;
+    valves
+    |> List.iter (fun (name, { flow; mask }) ->
+      if Int.(mask land opened) = 0
+      then (
+        let dist = get_dist current name in
+        let time' = time - (dist + 1) in
+        if time' > 0
+        then (
+          let released' = released + (flow * time') in
+          let opened' = Int.(mask lor opened) in
+          traverse' name time' released' opened')))
+  in
+  traverse' current time released opened;
+  states
+  |> Iter.of_hashtbl
+  |> Iter.sort ~cmp:(fun (_, a_score) (_, b_score) -> b_score - a_score)
+;;
+
+let solve_part_1 lines =
+  let valves, get_dist = parse_valves lines in
+  let states = traverse get_dist valves 30 in
+  match states |> Iter.take 1 |> Iter.to_list with
+  | [ (_, score) ] -> score
+  | _ -> failwith "no traversals ?"
+;;
+
+let%expect_test "Day 16.1 example" =
+  Printf.printf "%i\n" @@ solve_part_1 example_lines;
+  [%expect {| 1651 |}]
+;;
+
+let%expect_test "Day 16.1" =
+  Printf.printf "%i\n" @@ solve_part_1 @@ Utils.lines_of_input 16;
+  [%expect {| 2265 |}]
+;;
+
+let solve_part_2 lines =
+  let valves, get_dist = parse_valves @@ lines in
+  let states = traverse get_dist valves 26 in
+  states
+  |> Iter.filter_map (fun (a_set, a_score) ->
+    match Iter.find_pred (fun (b_set, _) -> Int.(a_set land b_set) = 0) states with
+    | Some (_, b_score) -> Some (a_score + b_score)
+    | None -> None)
+  |> Iter.fold Int.max 0
+;;
+
+let%expect_test "Day 16.2 example" =
+  Printf.printf "%i\n" @@ solve_part_2 example_lines;
+  [%expect {| 1707 |}]
+;;
+
+(* god damn bitmasks are fast, 30x speedup from StrSet! down to 50ms now *)
+let%expect_test "Day 16.2" =
+  Printf.printf "%i\n" @@ solve_part_2 @@ Utils.lines_of_input 16;
+  [%expect {| 2811 |}]
+;;

src/day17.ml

@@ -0,0 +1,201 @@
+open Containers
+
+let cave_width = 7
+let example_lines = [ ">>><<><>><<<>><>>><<<>>><<<><<<>><>><<>>" ]
+
+let dir_of_char = function
+  | '<' -> Vec2.left
+  | '>' -> Vec2.right
+  | _ -> failwith "oof"
+;;
+
+let next_stream_idx stream idx = (idx + 1) mod Array.length stream
+
+(*[{
+                       #
+         #       #     #
+        ###      #     #     ##
+ ####    #     ###     #     ##
+
+ row    plus   angle   col   square
+
+}]*)
+type shape =
+  | Row
+  | Plus
+  | Angle
+  | Col
+  | Square
+
+let get_shape idx = [| Row; Plus; Angle; Col; Square |].(idx mod 5)
+
+let shape_points shape pos =
+  let points =
+    match shape with
+    | Row -> [ 0, 0; 1, 0; 2, 0; 3, 0 ]
+    | Plus -> [ 0, 1; 1, 0; 1, 1; 1, 2; 2, 1 ]
+    | Angle -> [ 0, 0; 1, 0; 2, 0; 2, 1; 2, 2 ]
+    | Col -> [ 0, 0; 0, 1; 0, 2; 0, 3 ]
+    | Square -> [ 0, 0; 1, 0; 0, 1; 1, 1 ]
+  in
+  points |> List.map (fun point -> Vec2.(pos + of_tuple point))
+;;
+
+type loop_key =
+  { rock : shape
+  ; stream_idx : int
+  ; normalized_topo : int array
+  }
+
+type loop =
+  { rock_idx : int
+  ; height : int
+  }
+
+type cave =
+  { grid : char Grid.t
+  ; mutable grid_topo : int array
+  ; mutable grid_height : int
+  ; total_rocks : int
+  ; mutable rocks : int
+  ; mutable stream_idx : int
+  ; loop_cache : (loop_key, loop) Hashtbl.t
+  ; mutable height : int
+  }
+
+let init_cave max_height total_rocks =
+  let grid = Grid.init ~width:7 ~height:max_height (Fun.const '.') in
+  { grid
+  ; height = -1
+  ; grid_height = -1
+  ; rocks = 0
+  ; stream_idx = 0
+  ; grid_topo = Array.init cave_width (Fun.const 0)
+  ; loop_cache = Hashtbl.create max_height
+  ; total_rocks
+  }
+;;
+
+let draw_cave cave = Grid.draw cave.grid ~rev_y:true (fun _ contents -> contents)
+
+let place_shape cave shape pos =
+  shape_points shape pos
+  |> List.iter (fun point ->
+    let delta = point.Vec2.y - cave.grid_height in
+    if delta > 0
+    then (
+      cave.height <- cave.height + delta;
+      cave.grid_height <- cave.grid_height + delta);
+    cave.grid_topo.(point.x) <- max point.y cave.grid_topo.(point.x);
+    Grid.set_e cave.grid point '#')
+;;
+
+let can_place_shape cave shape pos =
+  shape_points shape pos
+  |> List.fold_while
+       (fun _ point ->
+         match cave.grid.Grid.%(point) with
+         | Some '.' -> true, `Continue
+         | _ -> false, `Stop)
+       false
+;;
+
+let drop_shape cave stream =
+  let shape = get_shape cave.rocks in
+  let rec drop pos =
+    let stream_pos = Vec2.(pos + stream.(cave.stream_idx)) in
+    cave.stream_idx <- next_stream_idx stream cave.stream_idx;
+    let pos = if can_place_shape cave shape stream_pos then stream_pos else pos in
+    let drop_pos = Vec2.(pos + Vec2.up) in
+    if can_place_shape cave shape drop_pos
+    then drop drop_pos
+    else place_shape cave shape pos
+  in
+  cave.rocks <- cave.rocks + 1;
+  drop Vec2.{ x = 2; y = Int.(cave.grid_height + 4) }
+;;
+
+let normalize_topo topo =
+  let min = Array.min_exn Int.compare topo in
+  Array.map (fun x -> x - min) topo
+;;
+
+let rec drop_shapes cave stream =
+  let loop_key =
+    { rock = get_shape cave.rocks
+    ; stream_idx = cave.stream_idx
+    ; normalized_topo = normalize_topo cave.grid_topo
+    }
+  in
+  let remaining_rocks cave = cave.total_rocks - cave.rocks in
+  let loop_rocks loop = cave.rocks - loop.rock_idx in
+  let loop_fits loop = loop_rocks loop < remaining_rocks cave in
+  match Hashtbl.get cave.loop_cache loop_key with
+  | Some loop when loop_fits loop ->
+    let loop_height = cave.height - loop.height in
+    cave.height <- cave.height + loop_height;
+    cave.rocks <- cave.rocks + loop_rocks loop;
+    drop_shapes cave stream
+  | _ when remaining_rocks cave > 0 ->
+    let loop = { height = cave.height; rock_idx = cave.rocks } in
+    Hashtbl.add cave.loop_cache loop_key loop;
+    drop_shape cave stream;
+    drop_shapes cave stream
+  | _ -> ()
+;;
+
+let solve remaining_rocks lines =
+  let stream = lines |> List.hd |> Iter.of_str |> Iter.map dir_of_char |> Iter.to_array in
+  let cave = init_cave 100_000 remaining_rocks in
+  drop_shapes cave stream;
+  cave.height + 1
+;;
+
+let%expect_test "Day 17.1 Example" =
+  Printf.printf "height: %i\n" @@ solve 2022 example_lines;
+  [%expect {| height: 3068 |}]
+;;
+
+let%expect_test "Day 17.1" =
+  Printf.printf "height: %i\n" @@ solve 2022 (Utils.lines_of_input 17);
+  [%expect {| height: 3227 |}]
+;;
+
+let%expect_test "Day 17.2 Example" =
+  Printf.printf "height: %i\n" @@ solve 1_000_000_000_000 example_lines;
+  [%expect {| height: 1514285714288 |}]
+;;
+
+let%expect_test "Day 17.2" =
+  Printf.printf "height: %i\n" @@ solve 1_000_000_000_000 (Utils.lines_of_input 17);
+  [%expect {| height: 1597714285698 |}]
+;;
+
+let%expect_test "Smol tower" =
+  let stream =
+    example_lines |> List.hd |> Iter.of_str |> Iter.map dir_of_char |> Iter.to_array
+  in
+  let cave = init_cave 18 8 in
+  drop_shapes cave stream;
+  Printf.printf "%s" @@ draw_cave cave;
+  [%expect
+    {|
+    .......
+    .......
+    .......
+    .....#.
+    .....#.
+    ..####.
+    .###...
+    ..#....
+    .####..
+    ....##.
+    ....##.
+    ....#..
+    ..#.#..
+    ..#.#..
+    #####..
+    ..###..
+    ...#...
+    ..####. |}]
+;;

src/day18.ml

@@ -0,0 +1,121 @@
+open Containers
+
+let example_lines =
+  String.lines
+    {|2,2,2
+1,2,2
+3,2,2
+2,1,2
+2,3,2
+2,2,1
+2,2,3
+2,2,4
+2,2,6
+1,2,5
+3,2,5
+2,1,5
+2,3,5|}
+;;
+
+module Vec3 = struct
+  type t = int * int * int [@@deriving show, eq, ord, hash]
+
+  let directions = [ 1, 0, 0; -1, 0, 0; 0, 1, 0; 0, -1, 0; 0, 0, 1; 0, 0, -1 ]
+  let ( + ) (x1, y1, z1) (x2, y2, z2) = x1 + x2, y1 + y2, z1 + z2
+  let ( - ) (x1, y1, z1) (x2, y2, z2) = x1 - x2, y1 - y2, z1 - z2
+  let ( = ) = equal
+
+  let iter_region (ax, ay, az) (bx, by, bz) callback =
+    for z = az to bz do
+      for y = ay to by do
+        for x = ax to bx do
+          let p = x, y, z in
+          callback p
+        done
+      done
+    done
+  ;;
+
+  let in_bounds (lx, ly, lz) (hx, hy, hz) (x, y, z) =
+    not (x < lx || x > hx || y < ly || y > hy || z < lz || z > hz)
+  ;;
+
+  let find_bounds points =
+    let first = Iter.head_exn points in
+    let padding = 1, 1, 1 in
+    let min, max =
+      points
+      |> Iter.drop 1
+      |> Iter.fold
+           (fun ((lx, ly, lz), (hx, hy, hz)) (x, y, z) ->
+             (min lx x, min ly y, min lz z), (max hx x, max hy y, max hz z))
+           (first, first)
+    in
+    min - padding, max + padding
+  ;;
+end
+
+module Vec3Set = Set.Make (Vec3)
+
+let parse_points lines =
+  lines
+  |> List.map (fun line ->
+    match List.map Int.of_string_exn Re.(matches (Pcre.regexp {|\d+|}) line) with
+    | [ x; y; z ] -> x, y, z
+    | _ -> failwith "oopzi doopers")
+  |> Vec3Set.of_list
+;;
+
+let solve_part_1 lines =
+  let points = parse_points lines in
+  let min, max = Vec3.find_bounds @@ Vec3Set.to_iter points in
+  let surface_area = ref 0 in
+  Vec3.iter_region min max (fun point ->
+    if not @@ Vec3Set.mem point points
+    then
+      Vec3.directions
+      |> List.iter (fun dir ->
+        let n = Vec3.(point + dir) in
+        if Vec3Set.mem n points then incr surface_area));
+  !surface_area
+;;
+
+let%expect_test "Day 18.1 example" =
+  Format.printf "%i" @@ solve_part_1 example_lines;
+  [%expect {| 64 |}]
+;;
+
+let%expect_test "Day 18.1" =
+  Format.printf "%i" @@ solve_part_1 @@ Utils.lines_of_input 18;
+  [%expect {| 3662 |}]
+;;
+
+let solve_part_2 lines =
+  let points = parse_points lines in
+  let min, max = Vec3.find_bounds @@ Vec3Set.to_iter points in
+  let in_bounds = Vec3.in_bounds min max in
+  let surface_area = ref 0 in
+  let directions_iter = Iter.of_list Vec3.directions in
+  let get_neighbors point =
+    directions_iter
+    |> Iter.map Vec3.(fun dir -> point + dir)
+    |> Iter.filter (fun neighbor ->
+      let in_droplet = Vec3Set.mem neighbor points in
+      if in_droplet then incr surface_area;
+      (not in_droplet) && in_bounds neighbor)
+  in
+  let _ignore =
+    Utils.djikstra_hash ~get_weight:(fun _ _ -> 1) ~get_neighbors ~start_nodes:[ min ] ()
+  in
+  !surface_area
+;;
+
+let%expect_test "Day 18.2 example" =
+  Format.printf "%i" @@ solve_part_2 example_lines;
+  [%expect {| 58 |}]
+;;
+
+let%expect_test "Day 18.2" =
+  Format.printf "%i" @@ solve_part_2 @@ Utils.lines_of_input 18;
+  [%expect {| 2060 |}]
+;;

src/day2.ml

@@ -52,7 +52,8 @@ let match_outcome = function
   | _, _ -> Lose
 ;;
 
-let part1 lines =
+let part1 () =
+  let lines = Utils.lines_of_input 2 in
   let parse_line line =
     match Re.Pcre.(split ~rex:(regexp {|\s+|}) line) with
     | them :: me :: _ -> parse_move them, parse_move me
@@ -66,7 +67,8 @@ let part1 lines =
     lines
 ;;
 
-let part2 lines =
+let part2 () =
+  let lines = Utils.lines_of_input 2 in
   let parse_line =
     function%pcre
     | {|(?<them>\w)\s*(?<outcome>\w)|} -> parse_move them, parse_outcome outcome
@@ -86,9 +88,12 @@ let part2 lines =
     lines
 ;;
 
-let print () =
-  let lines = Utils.lines_of_input 2 in
-  Printf.(
-    printf "Day 2.1: %d\n" @@ part1 lines;
-    printf "Day 2.2: %d\n" @@ part2 lines)
+let%expect_test "Day 2.1" =
+  Printf.printf "%d" @@ part1 ();
+  [%expect {| 11841 |}]
+;;
+
+let%expect_test "Day 2.2" =
+  Printf.printf "%d" @@ part2 ();
+  [%expect {| 13022 |}]
 ;;

src/day3.ml

@@ -10,22 +10,17 @@ let priority char =
   | _ -> failwith @@ Printf.sprintf "'%c' is not a valid item" char
 ;;
 
-
-let parse_line line =
-  let half_len = String.length line / 2 in
-  let first_half = String.sub line 0 half_len in
-  let second_half = String.sub line half_len half_len in
-  set_of_string first_half, set_of_string second_half
-;;
-
-let part1 lines =
+let part1 () =
+  let lines = Utils.lines_of_input 3 in
   List.fold_left
     (fun acc line ->
-      let first, second = parse_line line in
+      let half_len = String.length line / 2 in
+      let first, second = Pair.map_same set_of_string (String.take_drop half_len line) in
       let item =
         match CharSet.elements @@ CharSet.inter first second with
         | [ item ] -> item
-        | _ -> failwith "sad"
+        | _ ->
+          failwith "first and second half of each line should only have 1 intersection"
       in
       acc + priority item)
     0
@@ -33,26 +28,30 @@ let part1 lines =
 ;;
 
 (*
-x thank you https://doc.sherlocode.com/ for helping me find Containers and its
-x List.chunks and List.reduce functions
-x*)
-let part2 lines =
+   shout out https://doc.sherlocode.com/ for helping me find Containers and its
+   List.chunks and List.reduce functions
+*)
+let part2 () =
+  let lines = Utils.lines_of_input 3 in
   let groups = List.chunks 3 (List.map set_of_string lines) in
   List.fold_left
     (fun acc group ->
       let item =
         match CharSet.elements @@ List.reduce_exn CharSet.inter group with
         | [ item ] -> item
-        | _ -> failwith "sad"
+        | _ -> failwith "each group of 3 lines should only have 1 intersection"
       in
       acc + priority item)
     0
     groups
 ;;
 
-let print () =
-  let lines = Utils.lines_of_input 3 in
-  Printf.(
-    printf "Day 3.1: %d\n" @@ part1 lines;
-    printf "Day 3.2: %d\n" @@ part2 lines)
+let%expect_test "Day 3.1" =
+  Printf.printf "%d" @@ part1 ();
+  [%expect {| 7446 |}]
+;;
+
+let%expect_test "Day 3.2" =
+  Printf.printf "%d" @@ part2 ();
+  [%expect {| 2646 |}]
 ;;

src/day4.ml

@@ -0,0 +1,44 @@
+open Containers
+
+let lines = Utils.lines_of_input 4
+
+let parse_line =
+  function%pcre
+  | {|(?<a>\d+)-(?<b>\d+),(?<c>\d+)-(?<d>\d+)|} ->
+    (int_of_string a, int_of_string b), (int_of_string c, int_of_string d)
+  | line -> failwith @@ Printf.sprintf "cannot parse line '%s'" line
+;;
+
+let count_overlaps is_overlapping =
+  lines
+  |> List.fold_left
+       (fun acc line ->
+         match is_overlapping @@ parse_line line with
+         | true -> acc + 1
+         | false -> acc)
+       0
+;;
+
+let part1 () =
+  count_overlaps (fun pairs ->
+    match pairs with
+    | (l1, r1), (l2, r2) when (l1 <= l2 && r1 >= r2) || (l2 <= l1 && r2 >= r1) -> true
+    | _ -> false)
+;;
+
+let part2 () =
+  count_overlaps (fun pairs ->
+    match pairs with
+    | (l1, r1), (l2, r2) when r1 < l2 || r2 < l1 -> false
+    | _ -> true)
+;;
+
+let%expect_test "Day 4.1" =
+  Printf.printf "%d" @@ part1 ();
+  [%expect {| 547 |}]
+;;
+
+let%expect_test "Day 4.2" =
+  Printf.printf "%d" @@ part2 ();
+  [%expect {| 843 |}]
+;;

src/day5.ml

@@ -0,0 +1,84 @@
+open Containers
+
+let crane_drop stacks index boxes = stacks.(index) <- boxes @ stacks.(index)
+
+let crane_lift stacks index count =
+  let stack = stacks.(index) in
+  let boxes, rest = List.take_drop count stack in
+  stacks.(index) <- rest;
+  boxes
+;;
+
+let crane_move1 stacks (count, lift, drop) =
+  List.iter
+    (fun _ ->
+      let box = crane_lift stacks lift 1 in
+      crane_drop stacks drop box)
+    List.Infix.(0 --^ count)
+;;
+
+let crane_move stacks (count, lift, drop) =
+  let boxes = crane_lift stacks lift count in
+  crane_drop stacks drop boxes
+;;
+
+let init_stacks lines =
+  let stacks = Array.init 10 (fun _ -> []) in
+  let rec parse_line index line =
+    let chunk, rest = String.take_drop 4 line in
+    match%pcre chunk with
+    | {|(?<letter>\w)|} ->
+      crane_drop stacks index [ letter ];
+      parse_line (index + 1) rest
+    | {| |} -> parse_line (index + 1) rest
+    | _ -> ()
+  in
+  List.iter (parse_line 1) (List.rev lines);
+  stacks
+;;
+
+let move_stacks stacks lines crane_move =
+  let parse_line =
+    function%pcre
+    | {|move (?<count>\d+) from (?<lift>\d+) to (?<drop>\d+)|} ->
+      int_of_string count, int_of_string lift, int_of_string drop
+    | line -> failwith @@ Printf.sprintf "could not parse line '%s'" line
+  in
+  List.iter
+    (fun line ->
+      let instructions = parse_line line in
+      crane_move stacks instructions)
+    lines
+;;
+
+let parse_input lines =
+  let init_lines, lines = List.take_drop_while (String.starts_with ~prefix:"[") lines in
+  let move_lines = List.drop_while Fun.(not % String.starts_with ~prefix:"move") lines in
+  init_lines, move_lines
+;;
+
+let solve crane_move =
+  let init_lines, move_lines = parse_input @@ Utils.lines_of_input 5 in
+  let stacks = init_stacks init_lines in
+  let () = move_stacks stacks move_lines crane_move in
+  Array.fold_left
+    (fun acc stack ->
+      match stack with
+      | top :: _ -> acc ^ top
+      | [] -> acc)
+    ""
+    stacks
+;;
+
+let part1 () = solve crane_move1
+let part2 () = solve crane_move
+
+let%expect_test "Day 5.1" =
+  Printf.printf "%s" @@ part1 ();
+  [%expect {| PSNRGBTFT |}]
+;;
+
+let%expect_test "Day 5.2" =
+  Printf.printf "%s" @@ part2 ();
+  [%expect {| BNTZFPMMW |}]
+;;

src/day6.ml

@@ -0,0 +1,35 @@
+open Containers
+module CharSet = Set.Make (Char)
+
+let window = 4
+
+let stream =
+  match Utils.lines_of_input 6 with
+  | [ line ] -> line
+  | _ -> failwith "more than one line in input"
+;;
+
+let find_start window =
+  let length = String.length stream in
+  let start_index =
+    List.Infix.(0 --^ (length - window))
+    |> List.drop_while (fun index ->
+      let chunk = String.take window (String.drop index stream) in
+      window <> (chunk |> String.to_list |> CharSet.of_list |> CharSet.cardinal))
+    |> List.hd
+  in
+  start_index + window
+;;
+
+let part1 () = find_start 4
+let part2 () = find_start 14
+
+let%expect_test "Day 6.1" =
+  Printf.printf "%d" @@ part1 ();
+  [%expect {| 1833 |}]
+;;
+
+let%expect_test "Day 6.2" =
+  Printf.printf "%d" @@ part2 ();
+  [%expect {| 3425 |}]
+;;

src/day7.ml

@@ -0,0 +1,112 @@
+open Containers
+
+(* could have simplified this a lot by getting rid of File *)
+type node =
+  | File of
+      { name : string
+      ; size : int
+      }
+  | Dir of
+      { name : string
+      ; parent : node option
+      ; mutable children : node list
+      }
+
+let get_dir_tree () =
+  let lines = List.drop 1 @@ Utils.lines_of_input 7 in
+  let line_num = ref 0 in
+  let tree = Dir { name = "/"; children = []; parent = None } in
+  let _ =
+    lines
+    |> List.fold_left
+         (fun node line ->
+           incr line_num;
+           match node with
+           | File _ -> failwith "current directory cannot be a file"
+           | Dir dir ->
+             (match String.split ~by:" " line with
+              | [ "$"; "ls" ] -> node
+              | [ "dir"; name ] ->
+                let new_dir = Dir { name; parent = Some (Dir dir); children = [] } in
+                dir.children <- new_dir :: dir.children;
+                node
+              | [ "$"; "cd"; ".." ] ->
+                (match dir.parent with
+                 | Some parent -> parent
+                 | _ ->
+                   failwith
+                   @@ Printf.sprintf
+                        "ERROR:%d: cant cd .. because node '%s' has no parent"
+                        !line_num
+                        dir.name)
+              | [ "$"; "cd"; name ] ->
+                dir.children
+                |> List.find (fun child ->
+                  match child with
+                  | Dir child_dir -> String.Infix.(name = child_dir.name)
+                  | _ -> false)
+              | [ size; name ] ->
+                let new_file = File { name; size = int_of_string size } in
+                dir.children <- new_file :: dir.children;
+                node
+              | _ -> failwith @@ Printf.sprintf "failed to parse line '%s'" line))
+         tree
+  in
+  tree
+;;
+
+let rec get_node_size fn node =
+  let get_node_size' = get_node_size fn in
+  match node with
+  | File file -> file.size
+  | Dir dir ->
+    let size =
+      match List.reduce ( + ) @@ List.map get_node_size' dir.children with
+      | Some size -> size
+      | None -> 0
+    in
+    fn size;
+    size
+;;
+
+let part1 () =
+  let tree = get_dir_tree () in
+  let answer = ref 0 in
+  let build_answer dir_size =
+    if dir_size <= 100000 then answer := !answer + dir_size;
+    ()
+  in
+  let _ = get_node_size build_answer tree in
+  !answer
+;;
+
+let part2 () =
+  let tree = get_dir_tree () in
+  let dir_sizes = ref [] in
+  let collect_dir_sizes dir_size =
+    dir_sizes := dir_size :: !dir_sizes;
+    ()
+  in
+  let used_space = get_node_size collect_dir_sizes tree in
+  let total_space = 70_000_000 in
+  let required_space = 30_000_000 in
+  let free_space = total_space - used_space in
+  match
+    !dir_sizes
+    |> List.sort ( - )
+    |> List.drop_while (fun size -> size < required_space - free_space)
+    |> List.head_opt
+  with
+  | Some size -> size
+  | None -> failwith "not possible!!"
+;;
+
+let%expect_test "Day 7.1" =
+  Printf.printf "%d" @@ part1 ();
+  [%expect {| 1453349 |}]
+;;
+
+let%expect_test "Day 7.2" =
+  Printf.printf "%d" @@ part2 ();
+  [%expect {| 2948823 |}]
+;;

src/day8.ml

@@ -0,0 +1,55 @@
+open Containers
+
+let parse_grid () =
+  Grid.of_lines Fun.(Char.to_string %> int_of_string) @@ Utils.lines_of_input 8
+;;
+
+let part1 () =
+  let grid = parse_grid () in
+  let num_visible = ref 0 in
+  Grid.iter grid (fun start ->
+    let start_height = Option.get_exn_or "unreachable" @@ Grid.at grid start in
+    let rec walk_shorter_trees start step =
+      let next = Vec2.(start + step) in
+      match Grid.at grid next with
+      | Some height when height < start_height -> walk_shorter_trees next step
+      | opt -> opt
+    in
+    let visible =
+      Vec2.directions
+      |> List.map @@ walk_shorter_trees start
+      |> List.map Option.is_none
+      |> List.reduce_exn ( || )
+    in
+    if visible then incr num_visible);
+  !num_visible
+;;
+
+let part2 () =
+  let grid = parse_grid () in
+  let best_score = ref 0 in
+  Grid.iter grid (fun start ->
+    let start_height = Option.get_exn_or "unreachable" @@ Grid.at grid start in
+    let rec trees_in_view start in_view step =
+      let next = Vec2.(start + step) in
+      match Grid.at grid next with
+      | Some height when height < start_height -> trees_in_view next (in_view + 1) step
+      | Some _ -> in_view + 1
+      | None -> in_view
+    in
+    let score =
+      Vec2.directions |> List.map @@ trees_in_view start 0 |> List.reduce_exn ( * )
+    in
+    if score > !best_score then best_score := score);
+  !best_score
+;;
+
+let%expect_test "Day 8.1" =
+  Printf.printf "%d" @@ part1 ();
+  [%expect {| 1803 |}]
+;;
+
+let%expect_test "Day 8.2" =
+  Printf.printf "%d" @@ part2 ();
+  [%expect {| 268912 |}]
+;;

src/day9.ml

@@ -0,0 +1,72 @@
+open Containers
+
+let parse_input () =
+  Utils.lines_of_input 9
+  |> List.concat_map (fun line ->
+    match String.split ~by:" " line with
+    | [ dir; count ] ->
+      let count = int_of_string count in
+      let dir =
+        match dir with
+        | "U" -> Vec2.up
+        | "D" -> Vec2.down
+        | "L" -> Vec2.left
+        | "R" -> Vec2.right
+        | _ -> failwith "failed to parse instructions"
+      in
+      List.init count (fun _ -> dir)
+    | _ -> failwith "failed to parse instructions")
+;;
+
+let next_pos head tail =
+  let dx, dy = Vec2.(to_tuple @@ (tail - head)) in
+  if abs dx <= 1 && abs dy <= 1
+  then tail
+  else (
+    let x_dir = if dx > 0 then Vec2.right else Vec2.left in
+    let y_dir = if dy > 0 then Vec2.down else Vec2.up in
+    let dir =
+      if abs dx = abs dy
+      then Vec2.(x_dir + y_dir)
+      else if abs dx > abs dy
+      then x_dir
+      else y_dir
+    in
+    Vec2.(head + dir))
+;;
+
+let solve length =
+  let moves = parse_input () in
+  let start = Vec2.origin in
+  let tail = List.init (length - 1) (fun _ -> start) in
+  let _, _, last_knot_hist =
+    List.fold_left
+      (fun (head, tail, last_knot_hist) dir ->
+        let new_head = Vec2.(head + dir) in
+        let last_knot, new_tail =
+          List.fold_map
+            (fun head knot ->
+              let new_knot = next_pos head knot in
+              new_knot, new_knot)
+            new_head
+            tail
+        in
+        new_head, new_tail, last_knot :: last_knot_hist)
+      (start, tail, [ start ])
+      moves
+  in
+  last_knot_hist |> List.uniq ~eq:Vec2.( = ) |> List.length
+;;
+
+let part1 () = solve 2
+let part2 () = solve 10
+
+let%expect_test "Day 9.1" =
+  Printf.printf "%d" @@ part1 ();
+  [%expect {| 6030 |}]
+;;
+
+let%expect_test "Day 9.2" =
+  Printf.printf "%d" @@ part2 ();
+  [%expect {| 2545 |}]
+;;

src/dune

@@ -1,7 +1,19 @@
 (library
  (name aoc)
- (libraries re containers dune-site)
- (preprocess (pps ppx_regexp)))
+ (libraries re containers iter dune-site angstrom)
+ (inline_tests)
+ (preprocess (pps
+               ppx_regexp
+               ppx_deriving.show
+               ppx_deriving.eq
+               ppx_deriving.ord
+               ppx_deriving_hash
+               ppx_expect
+               ppx_inline_test)))
+
+(env
+ (dev
+  (flags (:standard -warn-error -A))))
 
 (install
  (section (site (aoc inputs)))

src/grid.ml

@@ -0,0 +1,99 @@
+open Containers
+
+type 'a t =
+  { width : int
+  ; height : int
+  ; items : 'a array
+  }
+[@@deriving show]
+
+let vec2_of_idx ~width ~idx =
+  let y = idx / width in
+  let x = idx mod width in
+  Vec2.of_tuple (x, y)
+;;
+
+let idx_of_vec2 width vec = Vec2.(Int.((width * vec.y) + vec.x))
+
+let in_bounds grid point =
+  let x, y = Vec2.to_tuple point in
+  x >= 0 && x < grid.width && y >= 0 && y < grid.height
+;;
+
+let at grid point =
+  if in_bounds grid point
+  then Array.get_safe grid.items @@ idx_of_vec2 grid.width point
+  else None
+;;
+
+let at_e (grid : 'a t) (point : Vec2.t) =
+  match at grid point with
+  | Some point -> point
+  | None -> failwith @@ Format.sprintf "point %a out of bounds!" Vec2.pp point
+;;
+
+let set_e grid point item =
+  if in_bounds grid point
+  then Array.set grid.items (idx_of_vec2 grid.width point) item
+  else failwith (Format.sprintf "point %a out of bounds!" Vec2.pp point)
+;;
+
+let ( .%() ) = at
+let ( .%()<- ) = set_e
+
+let find (grid : 'a t) pred =
+  let open Option.Infix in
+  let* idx, item = Array.find_idx pred grid.items in
+  Some (vec2_of_idx ~width:grid.width ~idx, item)
+;;
+
+let count grid pred =
+  Array.fold (fun count item -> if pred item then count + 1 else count) 0 grid.items
+;;
+
+let init ~width ~height init =
+  { width
+  ; height
+  ; items = Array.init (width * height) (fun idx -> init @@ vec2_of_idx ~width ~idx)
+  }
+;;
+
+let of_lines parse_char lines : 'a t =
+  match lines with
+  | first_line :: _ ->
+    let width = String.length first_line in
+    let height = List.length lines in
+    let yeet =
+      lines
+      |> List.map String.to_list
+      |> List.flatten
+      |> List.map parse_char
+      |> Array.of_list
+    in
+    { width; height; items = yeet }
+  | _ -> failwith "somethin fucd up"
+;;
+
+let iter_region grid a b callback =
+  Vec2.iter_region a b (fun pos -> if in_bounds grid pos then callback pos)
+;;
+
+let iter grid callback =
+  let a = Vec2.of_tuple (0, 0) in
+  let b = Vec2.of_tuple (grid.width - 1, grid.height - 1) in
+  iter_region grid a b callback
+;;
+
+let draw grid ?(rev_y = false) ?(rev_x = false) printer =
+  let line = ref [] in
+  let lines = ref [] in
+  iter grid (fun point ->
+    let item = grid.%(point) in
+    let char = printer point (Option.get_exn_or "iter is broken" item) in
+    line := if rev_x then char :: !line else !line @ [ char ];
+    if List.length !line = grid.width
+    then (
+      lines := !lines @ [ String.of_list !line ];
+      line := []));
+  String.concat "\n" (if rev_y then List.rev !lines else !lines)
+;;

src/grid.mli

@@ -0,0 +1,14 @@
+type 'a t [@@deriving show]
+
+val at : 'a t -> Vec2.t -> 'a option
+val at_e : 'a t -> Vec2.t -> 'a
+val set_e : 'a t -> Vec2.t -> 'a -> unit
+val ( .%() ) : 'a t -> Vec2.t -> 'a option
+val ( .%()<- ) : 'a t -> Vec2.t -> 'a -> unit
+val init : width:int -> height:int -> (Vec2.t -> 'a) -> 'a t
+val of_lines : (char -> 'a) -> string list -> 'a t
+val find : 'a t -> ('a -> bool) -> (Vec2.t * 'a) option
+val count : 'a t -> ('a -> bool) -> int
+val iter_region : 'a t -> Vec2.t -> Vec2.t -> (Vec2.t -> unit) -> unit
+val iter : 'a t -> (Vec2.t -> unit) -> unit
+val draw : 'a t -> ?rev_y:bool -> ?rev_x:bool -> (Vec2.t -> 'a -> char) -> string

src/utils.ml

@@ -9,3 +9,124 @@ let lines_of_input day =
   let path = Printf.sprintf "%s/day%d.tt" base_path day in
   IO.(with_in path read_lines_l)
 ;;
+
+(** [f] in [memo f] should be a function that makes recursive calls
+    via the memoized function passed as its first argument. ie:
+    {[
+      let fib_m =
+        memo (fun self x ->
+          match x with
+          | 0 | 1 -> 1
+          | x -> self (x - 1) + self (x - 2))
+      ;;
+    ]} *)
+let memo f =
+  let open Hashtbl in
+  let cache = create 100000 in
+  let rec f_mem k =
+    try find cache k with
+    | Not_found ->
+      let v = f f_mem k in
+      add cache k v;
+      v
+  in
+  f_mem
+;;
+
+let%expect_test "fib memoized" =
+  let fib_m =
+    memo (fun fib_m x ->
+      match x with
+      | 0 | 1 -> 1
+      | x -> fib_m (x - 1) + fib_m (x - 2))
+  in
+  Printf.printf "%i\n" @@ fib_m 100;
+  [%expect {| 1298777728820984005 |}]
+;;
+
+let djikstra ~eq ~get_info ~set_info ~get_weight ~get_neighbors ~goal ~start_nodes =
+  let seen = ref [] in
+  let rec djikstra' c_node =
+    let c_dist, _ = get_info c_node in
+    set_info c_node (c_dist, true);
+    get_neighbors c_node
+    |> Iter.iter (fun neighbor ->
+      let n_dist, n_visited = get_info neighbor in
+      if not n_visited
+      then (
+        let new_dist = c_dist + get_weight c_node neighbor in
+        if new_dist < n_dist then set_info neighbor (new_dist, n_visited);
+        seen := List.add_nodup ~eq neighbor !seen));
+    seen
+    := List.fast_sort
+         (fun a b ->
+           let a_dist, _ = get_info a in
+           let b_dist, _ = get_info b in
+           Int.compare a_dist b_dist)
+         !seen;
+    match goal, !seen with
+    | Some goal_node, next :: _ when eq goal_node next ->
+      let dist, _ = get_info next in
+      Some dist
+    | None, [] -> Some 0
+    | _, next :: rest ->
+      seen := rest;
+      djikstra' next
+    | Some _, [] -> None
+  in
+  List.iter (fun node -> set_info node (0, false)) start_nodes;
+  match start_nodes with
+  | first :: rest ->
+    seen := rest;
+    djikstra' first
+  | _ -> failwith "start_nodes cannot be empty"
+;;
+
+let djikstra_hash
+  (type k)
+  ?(hash = Hashtbl.hash)
+  ?(eq = Stdlib.( = ))
+  ?(slots = 100)
+  ~get_weight
+  ~get_neighbors
+  ~start_nodes
+  ()
+  =
+  let module Tbl =
+    CCHashtbl.Make (struct
+      type t = k
+
+      let equal = eq
+      let hash = hash
+    end)
+  in
+  let table = Tbl.create slots in
+  let get_info node = Tbl.get_or ~default:(Int.max_int, false) table node in
+  let set_info node info = Tbl.replace table node info in
+  let dist_of node = Option.(Tbl.get table node >|= fun (dist, _) -> dist) in
+  let _ =
+    djikstra ~eq ~get_info ~set_info ~get_weight ~get_neighbors ~goal:None ~start_nodes
+  in
+  dist_of
+;;
+
+module Parse = struct
+  include Angstrom
+
+  let sign = option 1 (char '-' >>= fun _ -> return (-1))
+
+  let digits =
+    take_while1 (function
+      | '0' .. '9' -> true
+      | _ -> false)
+    >>| int_of_string
+  ;;
+
+  let int = map2 sign digits ~f:( * )
+
+  let not_int =
+    skip_while (function
+      | '0' .. '9' | '-' -> false
+      | _ -> true)
+  ;;
+end

src/vec2.ml

@@ -0,0 +1,57 @@
+open Containers
+
+type t =
+  { x : int
+  ; y : int
+  }
+[@@deriving eq, ord, hash]
+
+let pp (fmt : Format.formatter) v = Format.fprintf fmt "(%i, %i)" v.x v.y
+let show v = Format.asprintf "%a" pp v
+let origin = { x = 0; y = 0 }
+let up = { x = 0; y = -1 }
+let down = { x = 0; y = 1 }
+let right = { x = 1; y = 0 }
+let left = { x = -1; y = 0 }
+let directions = [ up; down; left; right ]
+let of_tuple (x, y) = { x; y }
+let to_tuple { x; y } = x, y
+let ( + ) a b = { x = a.x + b.x; y = a.y + b.y }
+let ( - ) a b = { x = a.x - b.x; y = a.y - b.y }
+let ( = ) = equal
+let abs a = Int.{ x = abs a.x; y = abs a.y }
+
+let iter_region a b callback =
+  for y = min a.y b.y to max a.y b.y do
+    for x = min a.x b.x to max a.x b.x do
+      callback { x; y }
+    done
+  done
+;;
+
+let fold_region a b callback init =
+  let acc = ref init in
+  iter_region a b (fun pos -> acc := callback !acc pos);
+  !acc
+;;
+
+let find_bounds padding points =
+  let lx, hx, ly, hy =
+    points
+    |> Iter.fold
+         (fun (lx, hx, ly, hy) { x; y } ->
+           let lx = min lx x in
+           let hx = max hx x in
+           let ly = min ly y in
+           let hy = max hy y in
+           lx, hx, ly, hy)
+         (Int.max_int, 0, Int.max_int, 0)
+  in
+  let lx = Int.(lx - padding) in
+  let hx = Int.(hx + padding) in
+  let ly = Int.(ly - padding) in
+  let hy = Int.(hy + padding) in
+  of_tuple (lx, ly), of_tuple (hx, hy)
+;;
+
+let in_bounds l h p = p.x >= l.x && p.x <= h.x && p.y >= l.y && p.y <= h.y

src/vec2.mli

@@ -0,0 +1,24 @@
+type t =
+  { x : int
+  ; y : int
+  }
+[@@deriving eq, ord, hash]
+
+val show : t -> string
+val pp : Format.formatter -> t -> unit
+val origin : t
+val up : t
+val down : t
+val left : t
+val right : t
+val directions : t list
+val of_tuple : int * int -> t
+val to_tuple : t -> int * int
+val ( + ) : t -> t -> t
+val ( - ) : t -> t -> t
+val ( = ) : t -> t -> bool
+val abs : t -> t
+val iter_region : t -> t -> (t -> unit) -> unit
+val fold_region : t -> t -> ('a -> t -> 'a) -> 'a -> 'a
+val find_bounds : int -> t Iter.t -> t * t
+val in_bounds : t -> t -> t -> bool