Merge branch 'main' of https://github.com/hunkyjimpjorps/AdventOfCode

133 files changed, 1085 insertions, 23 deletions

diff --git a/aoc2018/day-01/day-01.rkt b/aoc2018/day-01/day-01.rkt
new file mode 100644
index 0000000..b18f7c9
--- /dev/null
+++ b/aoc2018/day-01/day-01.rkt
@@ -0,0 +1,16 @@
+#lang racket
+
+(require advent-of-code
+         threading)
+
+(define deltas
+  (~>> (open-aoc-input (find-session) 2018 1 #:cache #true) port->lines (map string->number)))
+
+;; part 1
+(for/sum ([delta deltas]) delta)
+
+;; part 2
+(for/fold ([seen (set)] [current-frequency 0] #:result current-frequency) ([delta (in-cycle deltas)])
+  (define new-frequency (+ current-frequency delta))
+  #:final (set-member? seen new-frequency)
+  (values (set-add seen new-frequency) new-frequency))
diff --git a/aoc2018/day-02/day-02.rkt b/aoc2018/day-02/day-02.rkt
new file mode 100644
index 0000000..38155fb
--- /dev/null
+++ b/aoc2018/day-02/day-02.rkt
@@ -0,0 +1,27 @@
+#lang racket
+
+(require advent-of-code
+         threading)
+
+(define ids (port->lines (open-aoc-input (find-session) 2018 2 #:cache #true)))
+
+;; part 1
+(define (make-baskets str)
+  (for/fold ([baskets (hash)]) ([ch (in-string str)])
+    (hash-update baskets ch add1 0)))
+
+(define (has-count n ht)
+  (member n (hash-values ht)))
+
+(for/fold ([two 0] [three 0] #:result (* two three)) ([id (in-list ids)])
+  (define baskets (make-baskets id))
+  (values (if (has-count 2 baskets) (add1 two) two) (if (has-count 3 baskets) (add1 three) three)))
+
+;; part 2
+(define (string-difference str1 str2)
+  (for/sum ([ch1 (in-string str1)] [ch2 (in-string str2)]) (if (equal? ch1 ch2) 0 1)))
+
+(for*/first ([id1 (in-list ids)] [id2 (in-list ids)] #:when (= 1 (string-difference id1 id2)))
+  (~>> (for/list ([ch1 (in-string id1)] [ch2 (in-string id2)] #:when (equal? ch1 ch2))
+         ch1)
+       (apply string)))
diff --git a/aoc2018/day-03/day-03.rkt b/aoc2018/day-03/day-03.rkt
new file mode 100644
index 0000000..b486361
--- /dev/null
+++ b/aoc2018/day-03/day-03.rkt
@@ -0,0 +1,51 @@
+#lang racket
+
+(require advent-of-code
+         threading
+         data/applicative
+         data/monad
+         megaparsack
+         megaparsack/text)
+
+(struct claim (number start-x start-y size-x size-y) #:transparent)
+
+(define claim/p
+  (do (char/p #\#)
+      [number <- integer/p]
+      (string/p " @ ")
+      [start-x <- integer/p]
+      (char/p #\,)
+      [start-y <- integer/p]
+      (string/p ": ")
+      [size-x <- integer/p]
+      (char/p #\x)
+      [size-y <- integer/p]
+      (pure (claim number start-x start-y size-x size-y))))
+
+(define (parse-claim str)
+  (parse-result! (parse-string claim/p str)))
+
+(define (make-claim ht cl)
+  (for*/fold ([fabric ht])
+             ([x (in-range (claim-start-x cl) (+ (claim-start-x cl) (claim-size-x cl)))]
+              [y (in-range (claim-start-y cl) (+ (claim-start-y cl) (claim-size-y cl)))])
+    (hash-update fabric (cons x y) add1 0)))
+
+(define claims
+  (~> (port->lines (open-aoc-input (find-session) 2018 3 #:cache #true)) (map parse-claim _)))
+
+(define claimed-fabric
+  (for/fold ([fabric (hash)]) ([cl (in-list claims)])
+    (make-claim fabric cl)))
+
+;; part 1
+(for/sum ([claim-count (in-list (hash-values claimed-fabric))] #:when (< 1 claim-count)) 1)
+
+;; part 2
+(define (uncontested-claim? fabric cl)
+  (for*/and ([x (in-range (claim-start-x cl) (+ (claim-start-x cl) (claim-size-x cl)))]
+             [y (in-range (claim-start-y cl) (+ (claim-start-y cl) (claim-size-y cl)))])
+    (= 1 (hash-ref fabric (cons x y)))))
+
+(for/first ([cl (in-list claims)] #:when (uncontested-claim? claimed-fabric cl))
+  (claim-number cl))
diff --git a/aoc2018/day-04/day-04.rkt b/aoc2018/day-04/day-04.rkt
new file mode 100644
index 0000000..3660099
--- /dev/null
+++ b/aoc2018/day-04/day-04.rkt
@@ -0,0 +1,43 @@
+#lang racket
+
+(require advent-of-code
+         data/applicative
+         data/monad
+         megaparsack
+         megaparsack/text
+         threading)
+
+(struct entry (month day hour minute message) #:transparent)
+
+(define (parse-message chrs)
+  (define str (apply string chrs))
+  (match str
+    ["wakes up" 'awake]
+    ["falls asleep" 'asleep]
+    [shift (~> shift (string-trim "Guard #") (string-trim " begins shift") string->number)]))
+
+(define entry/p
+  (do (string/p "[1518-")
+      [month <- integer/p]
+      (char/p #\-)
+      [day <- integer/p]
+      space/p
+      [hour <- integer/p]
+      (char/p #\:)
+      [minute <- integer/p]
+      (string/p "] ")
+      [message <- (many/p any-char/p)]
+      (pure (entry month day hour minute (parse-message message)))))
+
+(define (parse-entry str)
+  (parse-result! (parse-string entry/p str)))
+
+(define entries
+  (~> (port->lines (open-aoc-input (find-session) 2018 4 #:cache #true)) (map parse-entry _)))
+
+(define sorted-entries
+  (~> entries
+      (sort < #:key entry-minute)
+      (sort < #:key entry-hour)
+      (sort < #:key entry-day)
+      (sort < #:key entry-month)))
diff --git a/aoc2018/day-05/day-05.rkt b/aoc2018/day-05/day-05.rkt
new file mode 100644
index 0000000..a78f5b5
--- /dev/null
+++ b/aoc2018/day-05/day-05.rkt
@@ -0,0 +1,31 @@
+#lang racket
+
+(require advent-of-code
+         threading)
+
+(define starting-chain
+  (~> (fetch-aoc-input (find-session) 2018 5 #:cache #true) string-trim string->list))
+
+(define (reactive-pair? ch1 ch2)
+  (and (equal? (char-downcase ch1) (char-downcase ch2)) (not (equal? ch1 ch2))))
+
+(define (remove-reactive-pairs chs [acc '()])
+  (match chs
+    [(list* ch1 ch2 rest-chs)
+     #:when (reactive-pair? ch1 ch2)
+     (remove-reactive-pairs rest-chs acc)]
+    [(list* ch rest-chs) (remove-reactive-pairs rest-chs (cons ch acc))]
+    [(list) (reverse acc)]))
+
+(define (keep-removing-reactive-pairs chs)
+  (define chs* (remove-reactive-pairs chs))
+  (if (equal? chs chs*) (length chs) (keep-removing-reactive-pairs chs*)))
+
+;; part 1
+(keep-removing-reactive-pairs starting-chain)
+
+;; part 2
+(~>> (for/list ([letter (in-string "abcdefghijklmnopqrstuvwxyz")])
+       (define tweaked-chain (filter (λ (c) (not (equal? (char-downcase c) letter))) starting-chain))
+       (keep-removing-reactive-pairs tweaked-chain))
+     (apply min))
diff --git a/aoc2018/day-06/day-06.rkt b/aoc2018/day-06/day-06.rkt
new file mode 100644
index 0000000..6f1f7b4
--- /dev/null
+++ b/aoc2018/day-06/day-06.rkt
@@ -0,0 +1 @@
+#lang racket
diff --git a/aoc2023/.DS_Store b/aoc2023-gleam/.DS_Store
index 5172429..5172429 100644
--- a/aoc2023/.DS_Store
+++ b/aoc2023-gleam/.DS_Store
diff --git a/aoc2023/.github/workflows/test.yml b/aoc2023-gleam/.github/workflows/test.yml
index cf2096e..cf2096e 100644
--- a/aoc2023/.github/workflows/test.yml
+++ b/aoc2023-gleam/.github/workflows/test.yml
diff --git a/aoc2023/.gitignore b/aoc2023-gleam/.gitignore
index 8248306..8248306 100644
--- a/aoc2023/.gitignore
+++ b/aoc2023-gleam/.gitignore
diff --git a/aoc2023/README.md b/aoc2023-gleam/README.md
index 3f534e8..3f534e8 100644
--- a/aoc2023/README.md
+++ b/aoc2023-gleam/README.md
diff --git a/aoc2023/gleam.toml b/aoc2023-gleam/gleam.toml
index 8190aef..8190aef 100644
--- a/aoc2023/gleam.toml
+++ b/aoc2023-gleam/gleam.toml
diff --git a/aoc2023/manifest.toml b/aoc2023-gleam/manifest.toml
index 900b5c0..416a155 100644
--- a/aoc2023/manifest.toml
+++ b/aoc2023-gleam/manifest.toml
@@ -2,19 +2,19 @@
 # You typically do not need to edit this file
 
 packages = [
-  { name = "adglent", version = "1.2.0", build_tools = ["gleam"], requirements = ["glint", "gleam_http", "gleam_stdlib", "simplifile", "gleam_erlang", "gap", "gleam_httpc", "snag", "gleam_community_ansi", "tom", "gleam_otp"], otp_app = "adglent", source = "hex", outer_checksum = "A20D35001061F8AD602E3B92FB3AC0E1E4EEC642AD2AAE0ACEAD3A85F37DA7F0" },
-  { name = "gap", version = "1.0.1", build_tools = ["gleam"], requirements = ["gleam_community_ansi", "gleam_stdlib"], otp_app = "gap", source = "hex", outer_checksum = "5E369751DB547BFBDA7735878DC04DA31FCA3112193D61D5D7566010C7C8BA98" },
-  { name = "gleam_community_ansi", version = "1.2.0", build_tools = ["gleam"], requirements = ["gleam_community_colour", "gleam_stdlib"], otp_app = "gleam_community_ansi", source = "hex", outer_checksum = "8B5A9677BC5A2738712BBAF2BA289B1D8195FDF962BBC769569976AD5E9794E1" },
-  { name = "gleam_community_colour", version = "1.2.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_community_colour", source = "hex", outer_checksum = "036C206886AFB9F153C552700A7A0B4D2864E3BC96A20C77E5F34A013C051BE3" },
-  { name = "gleam_community_maths", version = "1.0.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_community_maths", source = "hex", outer_checksum = "1B9DB313E94A0E4674CA84C5D29F45ECFE211BFB38ABBD8B23737395F47D08B3" },
+  { name = "adglent", version = "1.2.0", build_tools = ["gleam"], requirements = ["gap", "gleam_community_ansi", "gleam_erlang", "gleam_http", "gleam_httpc", "gleam_otp", "gleam_stdlib", "glint", "simplifile", "snag", "tom"], otp_app = "adglent", source = "hex", outer_checksum = "A20D35001061F8AD602E3B92FB3AC0E1E4EEC642AD2AAE0ACEAD3A85F37DA7F0" },
+  { name = "gap", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_community_ansi", "gleam_stdlib"], otp_app = "gap", source = "hex", outer_checksum = "2EE1B0A17E85CF73A0C1D29DA315A2699117A8F549C8E8D89FA8261BE41EDEB1" },
+  { name = "gleam_community_ansi", version = "1.4.0", build_tools = ["gleam"], requirements = ["gleam_community_colour", "gleam_stdlib"], otp_app = "gleam_community_ansi", source = "hex", outer_checksum = "FE79E08BF97009729259B6357EC058315B6FBB916FAD1C2FF9355115FEB0D3A4" },
+  { name = "gleam_community_colour", version = "1.3.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_community_colour", source = "hex", outer_checksum = "A49A5E3AE8B637A5ACBA80ECB9B1AFE89FD3D5351FF6410A42B84F666D40D7D5" },
+  { name = "gleam_community_maths", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_community_maths", source = "hex", outer_checksum = "E30C61A75051DAF7CFD77C4FBAA04140FDA0B5D831955E7A74521E5576E2780D" },
   { name = "gleam_erlang", version = "0.23.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "C21CFB816C114784E669FFF4BBF433535EEA9960FA2F216209B8691E87156B96" },
-  { name = "gleam_http", version = "3.5.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_http", source = "hex", outer_checksum = "AECDA43AFD523D07A8F09068598A6E271C505278A0CB6F9C7A2E4365EAE8D11E" },
-  { name = "gleam_httpc", version = "2.1.1", build_tools = ["gleam"], requirements = ["gleam_http", "gleam_stdlib"], otp_app = "gleam_httpc", source = "hex", outer_checksum = "06AC1CA52C9BAA66C9D5C0303B2BF34E39AA1546BB96AEE496E4B06D513AB8C7" },
-  { name = "gleam_otp", version = "0.8.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "gleam_erlang"], otp_app = "gleam_otp", source = "hex", outer_checksum = "18EF8242A5E54BA92F717C7222F03B3228AEE00D1F286D4C56C3E8C18AA2588E" },
-  { name = "gleam_stdlib", version = "0.33.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "539E37A2AA5EBE8E75F4B74755E4CC604BD957C3000AC8D705A2024886A2738B" },
-  { name = "glint", version = "0.13.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "gleam_community_ansi", "gleam_community_colour", "snag"], otp_app = "glint", source = "hex", outer_checksum = "46E56049CD370D61F720D319D0AB970408C9336EEB918F08B5DCB1DCE9845FA3" },
+  { name = "gleam_http", version = "3.6.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_http", source = "hex", outer_checksum = "8C07DF9DF8CC7F054C650839A51C30A7D3C26482AC241C899C1CEA86B22DBE51" },
+  { name = "gleam_httpc", version = "2.1.2", build_tools = ["gleam"], requirements = ["gleam_http", "gleam_stdlib"], otp_app = "gleam_httpc", source = "hex", outer_checksum = "ACD05CA3BAC7780DF5FFAE334621FD199D1B490FAF6ECDFF74316CAA61CE88E6" },
+  { name = "gleam_otp", version = "0.8.0", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_stdlib"], otp_app = "gleam_otp", source = "hex", outer_checksum = "18EF8242A5E54BA92F717C7222F03B3228AEE00D1F286D4C56C3E8C18AA2588E" },
+  { name = "gleam_stdlib", version = "0.36.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "C0D14D807FEC6F8A08A7C9EF8DFDE6AE5C10E40E21325B2B29365965D82EB3D4" },
+  { name = "glint", version = "0.13.0", build_tools = ["gleam"], requirements = ["gleam_community_ansi", "gleam_community_colour", "gleam_stdlib", "snag"], otp_app = "glint", source = "hex", outer_checksum = "46E56049CD370D61F720D319D0AB970408C9336EEB918F08B5DCB1DCE9845FA3" },
   { name = "pqueue", version = "2.0.7", build_tools = ["rebar3"], requirements = [], otp_app = "pqueue", source = "hex", outer_checksum = "8B0204BB202335890E4E7F9B99A8EC0B84DDB8513EE298EB180EE9B3BCB4C859" },
-  { name = "simplifile", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "0BD6F0E7DA1A7E11D18B8AD48453225CAFCA4C8CFB4513D217B372D2866C501C" },
+  { name = "simplifile", version = "1.5.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "EB9AA8E65E5C1E3E0FDCFC81BC363FD433CB122D7D062750FFDF24DE4AC40116" },
   { name = "snag", version = "0.2.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "snag", source = "hex", outer_checksum = "8FD70D8FB3728E08AC425283BB509BB0F012BE1AE218424A597CDE001B0EE589" },
   { name = "tom", version = "0.2.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "tom", source = "hex", outer_checksum = "5C5A9B8586C547F1F39542B1A3BBD9FEE17AFEAB51CE53B32B13D0D46B421249" },
 ]
diff --git a/aoc2023/src/.gitignore b/aoc2023-gleam/src/.gitignore
index bc13a69..bc13a69 100644
--- a/aoc2023/src/.gitignore
+++ b/aoc2023-gleam/src/.gitignore
diff --git a/aoc2023/src/day1/.gitignore b/aoc2023-gleam/src/day1/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day1/.gitignore
+++ b/aoc2023-gleam/src/day1/.gitignore
diff --git a/aoc2023/src/day1/solve.gleam b/aoc2023-gleam/src/day1/solve.gleam
index 37a19d2..37a19d2 100644
--- a/aoc2023/src/day1/solve.gleam
+++ b/aoc2023-gleam/src/day1/solve.gleam
diff --git a/aoc2023/src/day10/.gitignore b/aoc2023-gleam/src/day10/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day10/.gitignore
+++ b/aoc2023-gleam/src/day10/.gitignore
diff --git a/aoc2023/src/day10/solve.gleam b/aoc2023-gleam/src/day10/solve.gleam
index c33634d..c33634d 100644
--- a/aoc2023/src/day10/solve.gleam
+++ b/aoc2023-gleam/src/day10/solve.gleam
diff --git a/aoc2023/src/day11/.gitignore b/aoc2023-gleam/src/day11/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day11/.gitignore
+++ b/aoc2023-gleam/src/day11/.gitignore
diff --git a/aoc2023/src/day11/solve.gleam b/aoc2023-gleam/src/day11/solve.gleam
index 35464a1..35464a1 100644
--- a/aoc2023/src/day11/solve.gleam
+++ b/aoc2023-gleam/src/day11/solve.gleam
diff --git a/aoc2023/src/day12/.gitignore b/aoc2023-gleam/src/day12/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day12/.gitignore
+++ b/aoc2023-gleam/src/day12/.gitignore
diff --git a/aoc2023/src/day12/solve.gleam b/aoc2023-gleam/src/day12/solve.gleam
index 893b83c..893b83c 100644
--- a/aoc2023/src/day12/solve.gleam
+++ b/aoc2023-gleam/src/day12/solve.gleam
diff --git a/aoc2023/src/day13/.gitignore b/aoc2023-gleam/src/day13/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day13/.gitignore
+++ b/aoc2023-gleam/src/day13/.gitignore
diff --git a/aoc2023/src/day13/solve.gleam b/aoc2023-gleam/src/day13/solve.gleam
index 6f9b9a0..6f9b9a0 100644
--- a/aoc2023/src/day13/solve.gleam
+++ b/aoc2023-gleam/src/day13/solve.gleam
diff --git a/aoc2023/src/day14/.gitignore b/aoc2023-gleam/src/day14/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day14/.gitignore
+++ b/aoc2023-gleam/src/day14/.gitignore
diff --git a/aoc2023/src/day14/solve.gleam b/aoc2023-gleam/src/day14/solve.gleam
index ecc5361..ecc5361 100644
--- a/aoc2023/src/day14/solve.gleam
+++ b/aoc2023-gleam/src/day14/solve.gleam
diff --git a/aoc2023/src/day15/.gitignore b/aoc2023-gleam/src/day15/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day15/.gitignore
+++ b/aoc2023-gleam/src/day15/.gitignore
diff --git a/aoc2023/src/day15/solve.gleam b/aoc2023-gleam/src/day15/solve.gleam
index a7d250c..a7d250c 100644
--- a/aoc2023/src/day15/solve.gleam
+++ b/aoc2023-gleam/src/day15/solve.gleam
diff --git a/aoc2023/src/day16/.gitignore b/aoc2023-gleam/src/day16/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day16/.gitignore
+++ b/aoc2023-gleam/src/day16/.gitignore
diff --git a/aoc2023/src/day16/solve.gleam b/aoc2023-gleam/src/day16/solve.gleam
index 65ce36b..65ce36b 100644
--- a/aoc2023/src/day16/solve.gleam
+++ b/aoc2023-gleam/src/day16/solve.gleam
diff --git a/aoc2023/src/day17/.gitignore b/aoc2023-gleam/src/day17/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day17/.gitignore
+++ b/aoc2023-gleam/src/day17/.gitignore
diff --git a/aoc2023/src/day17/solve.gleam b/aoc2023-gleam/src/day17/solve.gleam
index 7a01c4d..7a01c4d 100644
--- a/aoc2023/src/day17/solve.gleam
+++ b/aoc2023-gleam/src/day17/solve.gleam
diff --git a/aoc2023/src/day18/.gitignore b/aoc2023-gleam/src/day18/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day18/.gitignore
+++ b/aoc2023-gleam/src/day18/.gitignore
diff --git a/aoc2023/src/day18/solve.gleam b/aoc2023-gleam/src/day18/solve.gleam
index 2c000f9..2c000f9 100644
--- a/aoc2023/src/day18/solve.gleam
+++ b/aoc2023-gleam/src/day18/solve.gleam
diff --git a/aoc2023/src/day19/.gitignore b/aoc2023-gleam/src/day19/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day19/.gitignore
+++ b/aoc2023-gleam/src/day19/.gitignore
diff --git a/aoc2023/src/day19/solve.gleam b/aoc2023-gleam/src/day19/solve.gleam
index 186e783..186e783 100644
--- a/aoc2023/src/day19/solve.gleam
+++ b/aoc2023-gleam/src/day19/solve.gleam
diff --git a/aoc2023/src/day2/.gitignore b/aoc2023-gleam/src/day2/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day2/.gitignore
+++ b/aoc2023-gleam/src/day2/.gitignore
diff --git a/aoc2023/src/day2/solve.gleam b/aoc2023-gleam/src/day2/solve.gleam
index 608955f..608955f 100644
--- a/aoc2023/src/day2/solve.gleam
+++ b/aoc2023-gleam/src/day2/solve.gleam
diff --git a/aoc2023/src/day20/.gitignore b/aoc2023-gleam/src/day20/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day20/.gitignore
+++ b/aoc2023-gleam/src/day20/.gitignore
diff --git a/aoc2023/src/day20/solve.gleam b/aoc2023-gleam/src/day20/solve.gleam
index 9192dac..9192dac 100644
--- a/aoc2023/src/day20/solve.gleam
+++ b/aoc2023-gleam/src/day20/solve.gleam
diff --git a/aoc2023/src/day22/.gitignore b/aoc2023-gleam/src/day21/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day22/.gitignore
+++ b/aoc2023-gleam/src/day21/.gitignore
diff --git a/aoc2023-gleam/src/day21/solve.gleam b/aoc2023-gleam/src/day21/solve.gleam
new file mode 100644
index 0000000..4d5c246
--- /dev/null
+++ b/aoc2023-gleam/src/day21/solve.gleam
@@ -0,0 +1,25 @@
+import adglent.{First, Second}
+import gleam/io
+
+pub fn part1(input: String) {
+  todo as "Implement solution to part 1"
+}
+
+pub fn part2(input: String) {
+  todo as "Implement solution to part 2"
+}
+
+pub fn main() {
+  let assert Ok(part) = adglent.get_part()
+  let assert Ok(input) = adglent.get_input("21")
+  case part {
+    First ->
+      part1(input)
+      |> adglent.inspect
+      |> io.println
+    Second ->
+      part2(input)
+      |> adglent.inspect
+      |> io.println
+  }
+}
diff --git a/aoc2023/src/day23/.gitignore b/aoc2023-gleam/src/day22/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day23/.gitignore
+++ b/aoc2023-gleam/src/day22/.gitignore
diff --git a/aoc2023/src/day22/solve.gleam b/aoc2023-gleam/src/day22/solve.gleam
index 7bf2fb4..7bf2fb4 100644
--- a/aoc2023/src/day22/solve.gleam
+++ b/aoc2023-gleam/src/day22/solve.gleam
diff --git a/aoc2023/src/day3/.gitignore b/aoc2023-gleam/src/day23/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day3/.gitignore
+++ b/aoc2023-gleam/src/day23/.gitignore
diff --git a/aoc2023/src/day23/solve.gleam b/aoc2023-gleam/src/day23/solve.gleam
index e1fe638..e1fe638 100644
--- a/aoc2023/src/day23/solve.gleam
+++ b/aoc2023-gleam/src/day23/solve.gleam
diff --git a/aoc2023/src/day4/.gitignore b/aoc2023-gleam/src/day3/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day4/.gitignore
+++ b/aoc2023-gleam/src/day3/.gitignore
diff --git a/aoc2023/src/day3/solve.gleam b/aoc2023-gleam/src/day3/solve.gleam
index ad975aa..ad975aa 100644
--- a/aoc2023/src/day3/solve.gleam
+++ b/aoc2023-gleam/src/day3/solve.gleam
diff --git a/aoc2023/src/day5/.gitignore b/aoc2023-gleam/src/day4/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day5/.gitignore
+++ b/aoc2023-gleam/src/day4/.gitignore
diff --git a/aoc2023/src/day4/solve.gleam b/aoc2023-gleam/src/day4/solve.gleam
index 34d6098..34d6098 100644
--- a/aoc2023/src/day4/solve.gleam
+++ b/aoc2023-gleam/src/day4/solve.gleam
diff --git a/aoc2023/src/day6/.gitignore b/aoc2023-gleam/src/day5/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day6/.gitignore
+++ b/aoc2023-gleam/src/day5/.gitignore
diff --git a/aoc2023/src/day5/solve.gleam b/aoc2023-gleam/src/day5/solve.gleam
index 7c05310..7c05310 100644
--- a/aoc2023/src/day5/solve.gleam
+++ b/aoc2023-gleam/src/day5/solve.gleam
diff --git a/aoc2023/src/day7/.gitignore b/aoc2023-gleam/src/day6/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day7/.gitignore
+++ b/aoc2023-gleam/src/day6/.gitignore
diff --git a/aoc2023/src/day6/solve.gleam b/aoc2023-gleam/src/day6/solve.gleam
index 88044c4..88044c4 100644
--- a/aoc2023/src/day6/solve.gleam
+++ b/aoc2023-gleam/src/day6/solve.gleam
diff --git a/aoc2023/src/day8/.gitignore b/aoc2023-gleam/src/day7/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day8/.gitignore
+++ b/aoc2023-gleam/src/day7/.gitignore
diff --git a/aoc2023/src/day7/solve.gleam b/aoc2023-gleam/src/day7/solve.gleam
index 4454883..4454883 100644
--- a/aoc2023/src/day7/solve.gleam
+++ b/aoc2023-gleam/src/day7/solve.gleam
diff --git a/aoc2023/src/day9/.gitignore b/aoc2023-gleam/src/day8/.gitignore
index ae40cea..ae40cea 100644
--- a/aoc2023/src/day9/.gitignore
+++ b/aoc2023-gleam/src/day8/.gitignore
diff --git a/aoc2023/src/day8/solve.gleam b/aoc2023-gleam/src/day8/solve.gleam
index 6b36e2d..6b36e2d 100644
--- a/aoc2023/src/day8/solve.gleam
+++ b/aoc2023-gleam/src/day8/solve.gleam
diff --git a/aoc2023-gleam/src/day9/.gitignore b/aoc2023-gleam/src/day9/.gitignore
new file mode 100644
index 0000000..ae40cea
--- /dev/null
+++ b/aoc2023-gleam/src/day9/.gitignore
@@ -0,0 +1 @@
+input.txt
\ No newline at end of file
diff --git a/aoc2023/src/day9/solve.gleam b/aoc2023-gleam/src/day9/solve.gleam
index a2cc7ae..a2cc7ae 100644
--- a/aoc2023/src/day9/solve.gleam
+++ b/aoc2023-gleam/src/day9/solve.gleam
diff --git a/aoc2023/src/utilities/array2d.gleam b/aoc2023-gleam/src/utilities/array2d.gleam
index 8538129..8538129 100644
--- a/aoc2023/src/utilities/array2d.gleam
+++ b/aoc2023-gleam/src/utilities/array2d.gleam
diff --git a/aoc2023/src/utilities/memo.gleam b/aoc2023-gleam/src/utilities/memo.gleam
index b06d8fd..b06d8fd 100644
--- a/aoc2023/src/utilities/memo.gleam
+++ b/aoc2023-gleam/src/utilities/memo.gleam
diff --git a/aoc2023/src/utilities/prioqueue.gleam b/aoc2023-gleam/src/utilities/prioqueue.gleam
index abf21b9..abf21b9 100644
--- a/aoc2023/src/utilities/prioqueue.gleam
+++ b/aoc2023-gleam/src/utilities/prioqueue.gleam
diff --git a/aoc2023/test/aoc2023_test.gleam b/aoc2023-gleam/test/aoc2023_test.gleam
index 2b696a4..2b696a4 100644
--- a/aoc2023/test/aoc2023_test.gleam
+++ b/aoc2023-gleam/test/aoc2023_test.gleam
diff --git a/aoc2023/test/day1/day1_test.gleam b/aoc2023-gleam/test/day1/day1_test.gleam
index 374653c..374653c 100644
--- a/aoc2023/test/day1/day1_test.gleam
+++ b/aoc2023-gleam/test/day1/day1_test.gleam
diff --git a/aoc2023/test/day10/day10_test.gleam b/aoc2023-gleam/test/day10/day10_test.gleam
index be9d82e..be9d82e 100644
--- a/aoc2023/test/day10/day10_test.gleam
+++ b/aoc2023-gleam/test/day10/day10_test.gleam
diff --git a/aoc2023/test/day11/day11_test.gleam b/aoc2023-gleam/test/day11/day11_test.gleam
index 8bb8c06..8bb8c06 100644
--- a/aoc2023/test/day11/day11_test.gleam
+++ b/aoc2023-gleam/test/day11/day11_test.gleam
diff --git a/aoc2023/test/day12/day12_test.gleam b/aoc2023-gleam/test/day12/day12_test.gleam
index 3daf0e9..3daf0e9 100644
--- a/aoc2023/test/day12/day12_test.gleam
+++ b/aoc2023-gleam/test/day12/day12_test.gleam
diff --git a/aoc2023/test/day13/day13_test.gleam b/aoc2023-gleam/test/day13/day13_test.gleam
index 7c65bed..7c65bed 100644
--- a/aoc2023/test/day13/day13_test.gleam
+++ b/aoc2023-gleam/test/day13/day13_test.gleam
diff --git a/aoc2023/test/day14/day14_test.gleam b/aoc2023-gleam/test/day14/day14_test.gleam
index 8efa74e..8efa74e 100644
--- a/aoc2023/test/day14/day14_test.gleam
+++ b/aoc2023-gleam/test/day14/day14_test.gleam
diff --git a/aoc2023/test/day15/day15_test.gleam b/aoc2023-gleam/test/day15/day15_test.gleam
index 0ecaecc..0ecaecc 100644
--- a/aoc2023/test/day15/day15_test.gleam
+++ b/aoc2023-gleam/test/day15/day15_test.gleam
diff --git a/aoc2023/test/day16/day16_test.gleam b/aoc2023-gleam/test/day16/day16_test.gleam
index 036504e..036504e 100644
--- a/aoc2023/test/day16/day16_test.gleam
+++ b/aoc2023-gleam/test/day16/day16_test.gleam
diff --git a/aoc2023/test/day17/day17_test.gleam b/aoc2023-gleam/test/day17/day17_test.gleam
index 2ce48e2..2ce48e2 100644
--- a/aoc2023/test/day17/day17_test.gleam
+++ b/aoc2023-gleam/test/day17/day17_test.gleam
diff --git a/aoc2023/test/day18/day18_test.gleam b/aoc2023-gleam/test/day18/day18_test.gleam
index 7b510c8..7b510c8 100644
--- a/aoc2023/test/day18/day18_test.gleam
+++ b/aoc2023-gleam/test/day18/day18_test.gleam
diff --git a/aoc2023/test/day19/day19_test.gleam b/aoc2023-gleam/test/day19/day19_test.gleam
index c911de5..c911de5 100644
--- a/aoc2023/test/day19/day19_test.gleam
+++ b/aoc2023-gleam/test/day19/day19_test.gleam
diff --git a/aoc2023/test/day2/day2_test.gleam b/aoc2023-gleam/test/day2/day2_test.gleam
index 28a65da..28a65da 100644
--- a/aoc2023/test/day2/day2_test.gleam
+++ b/aoc2023-gleam/test/day2/day2_test.gleam
diff --git a/aoc2023/test/day20/day20_test.gleam b/aoc2023-gleam/test/day20/day20_test.gleam
index 9b79b05..9b79b05 100644
--- a/aoc2023/test/day20/day20_test.gleam
+++ b/aoc2023-gleam/test/day20/day20_test.gleam
diff --git a/aoc2023-gleam/test/day21/day21_test.gleam b/aoc2023-gleam/test/day21/day21_test.gleam
new file mode 100644
index 0000000..5f46808
--- /dev/null
+++ b/aoc2023-gleam/test/day21/day21_test.gleam
@@ -0,0 +1,38 @@
+import gleam/list
+import showtime/tests/should
+import adglent.{type Example, Example}
+import day21/solve
+
+type Problem1AnswerType =
+  String
+
+type Problem2AnswerType =
+  String
+
+/// Add examples for part 1 here:
+/// ```gleam
+///const part1_examples: List(Example(Problem1AnswerType)) = [Example("some input", "")]
+/// ```
+const part1_examples: List(Example(Problem1AnswerType)) = []
+
+/// Add examples for part 2 here:
+/// ```gleam
+///const part2_examples: List(Example(Problem2AnswerType)) = [Example("some input", "")]
+/// ```
+const part2_examples: List(Example(Problem2AnswerType)) = []
+
+pub fn part1_test() {
+  part1_examples
+  |> should.not_equal([])
+  use example <- list.map(part1_examples)
+  solve.part1(example.input)
+  |> should.equal(example.answer)
+}
+
+pub fn part2_test() {
+  part2_examples
+  |> should.not_equal([])
+  use example <- list.map(part2_examples)
+  solve.part2(example.input)
+  |> should.equal(example.answer)
+}
diff --git a/aoc2023/test/day22/day22_test.gleam b/aoc2023-gleam/test/day22/day22_test.gleam
index 3f8c0ca..3f8c0ca 100644
--- a/aoc2023/test/day22/day22_test.gleam
+++ b/aoc2023-gleam/test/day22/day22_test.gleam
diff --git a/aoc2023/test/day23/day23_test.gleam b/aoc2023-gleam/test/day23/day23_test.gleam
index 206571c..206571c 100644
--- a/aoc2023/test/day23/day23_test.gleam
+++ b/aoc2023-gleam/test/day23/day23_test.gleam
diff --git a/aoc2023/test/day3/day3_test.gleam b/aoc2023-gleam/test/day3/day3_test.gleam
index 30e17a9..30e17a9 100644
--- a/aoc2023/test/day3/day3_test.gleam
+++ b/aoc2023-gleam/test/day3/day3_test.gleam
diff --git a/aoc2023/test/day4/day4_test.gleam b/aoc2023-gleam/test/day4/day4_test.gleam
index 324fe36..324fe36 100644
--- a/aoc2023/test/day4/day4_test.gleam
+++ b/aoc2023-gleam/test/day4/day4_test.gleam
diff --git a/aoc2023/test/day5/day5_test.gleam b/aoc2023-gleam/test/day5/day5_test.gleam
index 86a8692..86a8692 100644
--- a/aoc2023/test/day5/day5_test.gleam
+++ b/aoc2023-gleam/test/day5/day5_test.gleam
diff --git a/aoc2023/test/day6/day6_test.gleam b/aoc2023-gleam/test/day6/day6_test.gleam
index c551993..c551993 100644
--- a/aoc2023/test/day6/day6_test.gleam
+++ b/aoc2023-gleam/test/day6/day6_test.gleam
diff --git a/aoc2023/test/day7/day7_test.gleam b/aoc2023-gleam/test/day7/day7_test.gleam
index f7f8454..f7f8454 100644
--- a/aoc2023/test/day7/day7_test.gleam
+++ b/aoc2023-gleam/test/day7/day7_test.gleam
diff --git a/aoc2023/test/day8/day8_test.gleam b/aoc2023-gleam/test/day8/day8_test.gleam
index 2cd499a..2cd499a 100644
--- a/aoc2023/test/day8/day8_test.gleam
+++ b/aoc2023-gleam/test/day8/day8_test.gleam
diff --git a/aoc2023/test/day9/day9_test.gleam b/aoc2023-gleam/test/day9/day9_test.gleam
index 84fd3ba..84fd3ba 100644
--- a/aoc2023/test/day9/day9_test.gleam
+++ b/aoc2023-gleam/test/day9/day9_test.gleam
diff --git a/aoc2023-other/day-01/day-01.rkt b/aoc2023-racket/day-01/day-01.rkt
index b720f79..b720f79 100644
--- a/aoc2023-other/day-01/day-01.rkt
+++ b/aoc2023-racket/day-01/day-01.rkt
diff --git a/aoc2023-other/day-02/day-02-parser.rkt b/aoc2023-racket/day-02/day-02-parser.rkt
index 76cc24f..76cc24f 100644
--- a/aoc2023-other/day-02/day-02-parser.rkt
+++ b/aoc2023-racket/day-02/day-02-parser.rkt
diff --git a/aoc2023-other/day-02/day-02.rkt b/aoc2023-racket/day-02/day-02.rkt
index 973d20c..973d20c 100644
--- a/aoc2023-other/day-02/day-02.rkt
+++ b/aoc2023-racket/day-02/day-02.rkt
diff --git a/aoc2023-other/day-03/day-03.rkt b/aoc2023-racket/day-03/day-03.rkt
index 60e81a6..60e81a6 100644
--- a/aoc2023-other/day-03/day-03.rkt
+++ b/aoc2023-racket/day-03/day-03.rkt
diff --git a/aoc2023-other/day-04/day-04.rkt b/aoc2023-racket/day-04/day-04.rkt
index 7a357c5..7a357c5 100644
--- a/aoc2023-other/day-04/day-04.rkt
+++ b/aoc2023-racket/day-04/day-04.rkt
diff --git a/aoc2023-other/day-05/day-05.rkt b/aoc2023-racket/day-05/day-05.rkt
index 5b9aa52..5b9aa52 100644
--- a/aoc2023-other/day-05/day-05.rkt
+++ b/aoc2023-racket/day-05/day-05.rkt
diff --git a/aoc2023-other/day-06/day-06.rkt b/aoc2023-racket/day-06/day-06.rkt
index 53ca9ee..53ca9ee 100644
--- a/aoc2023-other/day-06/day-06.rkt
+++ b/aoc2023-racket/day-06/day-06.rkt
diff --git a/aoc2023-other/day-07/day-07.rkt b/aoc2023-racket/day-07/day-07.rkt
index 30e629b..30e629b 100644
--- a/aoc2023-other/day-07/day-07.rkt
+++ b/aoc2023-racket/day-07/day-07.rkt
diff --git a/aoc2023-other/day-08/day-08.rkt b/aoc2023-racket/day-08/day-08.rkt
index 06daafa..06daafa 100644
--- a/aoc2023-other/day-08/day-08.rkt
+++ b/aoc2023-racket/day-08/day-08.rkt
diff --git a/aoc2023-other/day-09/day-09-polynomial.rkt b/aoc2023-racket/day-09/day-09-polynomial.rkt
index 5bacb1f..5bacb1f 100644
--- a/aoc2023-other/day-09/day-09-polynomial.rkt
+++ b/aoc2023-racket/day-09/day-09-polynomial.rkt
diff --git a/aoc2023-other/day-09/day-09.rkt b/aoc2023-racket/day-09/day-09.rkt
index 5eda1eb..5eda1eb 100644
--- a/aoc2023-other/day-09/day-09.rkt
+++ b/aoc2023-racket/day-09/day-09.rkt
diff --git a/aoc2023-other/day-10/day-10.rkt b/aoc2023-racket/day-10/day-10.rkt
index 64d8727..64d8727 100644
--- a/aoc2023-other/day-10/day-10.rkt
+++ b/aoc2023-racket/day-10/day-10.rkt
diff --git a/aoc2023-other/day-11/day-11.rkt b/aoc2023-racket/day-11/day-11.rkt
index dba617b..dba617b 100644
--- a/aoc2023-other/day-11/day-11.rkt
+++ b/aoc2023-racket/day-11/day-11.rkt
diff --git a/aoc2023-other/day-12/day-12.rkt b/aoc2023-racket/day-12/day-12.rkt
index 50b14bb..50b14bb 100644
--- a/aoc2023-other/day-12/day-12.rkt
+++ b/aoc2023-racket/day-12/day-12.rkt
diff --git a/aoc2023-other/day-13/day-13.rkt b/aoc2023-racket/day-13/day-13.rkt
index 47718f8..47718f8 100644
--- a/aoc2023-other/day-13/day-13.rkt
+++ b/aoc2023-racket/day-13/day-13.rkt
diff --git a/aoc2023-other/day-14/day-14.rkt b/aoc2023-racket/day-14/day-14.rkt
index d0b7cad..d0b7cad 100644
--- a/aoc2023-other/day-14/day-14.rkt
+++ b/aoc2023-racket/day-14/day-14.rkt
diff --git a/aoc2023-other/day-15/day-15.rkt b/aoc2023-racket/day-15/day-15.rkt
index d049565..d049565 100644
--- a/aoc2023-other/day-15/day-15.rkt
+++ b/aoc2023-racket/day-15/day-15.rkt
diff --git a/aoc2023-other/day-16/day-16.rkt b/aoc2023-racket/day-16/day-16.rkt
index 4a70de8..4a70de8 100644
--- a/aoc2023-other/day-16/day-16.rkt
+++ b/aoc2023-racket/day-16/day-16.rkt
diff --git a/aoc2023-other/day-17/day-17.rkt b/aoc2023-racket/day-17/day-17.rkt
index 05709ad..05709ad 100644
--- a/aoc2023-other/day-17/day-17.rkt
+++ b/aoc2023-racket/day-17/day-17.rkt
diff --git a/aoc2023-other/day-18/day-18.rkt b/aoc2023-racket/day-18/day-18.rkt
index b589e41..b589e41 100644
--- a/aoc2023-other/day-18/day-18.rkt
+++ b/aoc2023-racket/day-18/day-18.rkt
diff --git a/aoc2023-other/day-19/day-19.rkt b/aoc2023-racket/day-19/day-19.rkt
index f7561f6..f7561f6 100644
--- a/aoc2023-other/day-19/day-19.rkt
+++ b/aoc2023-racket/day-19/day-19.rkt
diff --git a/aoc2023-other/day-20/day-20.rkt b/aoc2023-racket/day-20/day-20.rkt
index 2e3852d..2e3852d 100644
--- a/aoc2023-other/day-20/day-20.rkt
+++ b/aoc2023-racket/day-20/day-20.rkt
diff --git a/aoc2023-other/day-21/day-21.rkt b/aoc2023-racket/day-21/day-21.rkt
index b5478eb..b5478eb 100644
--- a/aoc2023-other/day-21/day-21.rkt
+++ b/aoc2023-racket/day-21/day-21.rkt
diff --git a/aoc2023-other/day-22/day-22.rkt b/aoc2023-racket/day-22/day-22.rkt
index 53668c0..53668c0 100644
--- a/aoc2023-other/day-22/day-22.rkt
+++ b/aoc2023-racket/day-22/day-22.rkt
diff --git a/aoc2023-other/day-23/day-23.rkt b/aoc2023-racket/day-23/day-23.rkt
index c048013..c048013 100644
--- a/aoc2023-other/day-23/day-23.rkt
+++ b/aoc2023-racket/day-23/day-23.rkt
diff --git a/aoc2023-other/day-24/day-24a.rkt b/aoc2023-racket/day-24/day-24a.rkt
index 31f526d..31f526d 100644
--- a/aoc2023-other/day-24/day-24a.rkt
+++ b/aoc2023-racket/day-24/day-24a.rkt
diff --git a/aoc2023-other/day-24/day-24b.rkt b/aoc2023-racket/day-24/day-24b.rkt
index b106b30..b106b30 100644
--- a/aoc2023-other/day-24/day-24b.rkt
+++ b/aoc2023-racket/day-24/day-24b.rkt
diff --git a/aoc2023-other/day-25/day-25.rkt b/aoc2023-racket/day-25/day-25.rkt
index aa32e43..aa32e43 100644
--- a/aoc2023-other/day-25/day-25.rkt
+++ b/aoc2023-racket/day-25/day-25.rkt
diff --git a/aoc2023/src/aoc2023.gleam b/aoc2023/src/aoc2023.gleam
deleted file mode 100644
index aab904d..0000000
--- a/aoc2023/src/aoc2023.gleam
+++ /dev/null
@@ -1,12 +0,0 @@
-import gleam/io
-import gleam/bit_array
-
-const str = "abcdefgh
-abcdefgh"
-
-pub fn main() {
-  let trim = 8
-  let assert <<_:bytes-size(trim), "\n":utf8, rest:bytes>> =
-    bit_array.from_string(str)
-  io.debug(rest)
-}
diff --git a/codingquest2024/.github/workflows/test.yml b/codingquest2024/.github/workflows/test.yml
new file mode 100644
index 0000000..916edea
--- /dev/null
+++ b/codingquest2024/.github/workflows/test.yml
@@ -0,0 +1,23 @@
+name: test
+
+on:
+  push:
+    branches:
+      - master
+      - main
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: "26.0.2"
+          gleam-version: "1.0.0"
+          rebar3-version: "3"
+          # elixir-version: "1.15.4"
+      - run: gleam deps download
+      - run: gleam test
+      - run: gleam format --check src test
diff --git a/codingquest2024/.gitignore b/codingquest2024/.gitignore
new file mode 100644
index 0000000..6fdd6db
--- /dev/null
+++ b/codingquest2024/.gitignore
@@ -0,0 +1,5 @@
+*.beam
+*.ez
+/build
+erl_crash.dump
+data.txt
diff --git a/codingquest2024/README.md b/codingquest2024/README.md
new file mode 100644
index 0000000..8412b48
--- /dev/null
+++ b/codingquest2024/README.md
@@ -0,0 +1,25 @@
+# codingquest2024
+
+[![Package Version](https://img.shields.io/hexpm/v/codingquest2024)](https://hex.pm/packages/codingquest2024)
+[![Hex Docs](https://img.shields.io/badge/hex-docs-ffaff3)](https://hexdocs.pm/codingquest2024/)
+
+```sh
+gleam add codingquest2024
+```
+```gleam
+import codingquest2024
+
+pub fn main() {
+  // TODO: An example of the project in use
+}
+```
+
+Further documentation can be found at <https://hexdocs.pm/codingquest2024>.
+
+## Development
+
+```sh
+gleam run   # Run the project
+gleam test  # Run the tests
+gleam shell # Run an Erlang shell
+```
diff --git a/codingquest2024/gleam.toml b/codingquest2024/gleam.toml
new file mode 100644
index 0000000..f39baa5
--- /dev/null
+++ b/codingquest2024/gleam.toml
@@ -0,0 +1,22 @@
+name = "codingquest2024"
+version = "1.0.0"
+
+# Fill out these fields if you intend to generate HTML documentation or publish
+# your project to the Hex package manager.
+#
+# description = ""
+# licences = ["Apache-2.0"]
+# repository = { type = "github", user = "username", repo = "project" }
+# links = [{ title = "Website", href = "https://gleam.run" }]
+#
+# For a full reference of all the available options, you can have a look at
+# https://gleam.run/writing-gleam/gleam-toml/. 
+
+[dependencies]
+gleam_stdlib = "~> 0.34 or ~> 1.0"
+simplifile = "~> 1.5"
+gleam_otp = "~> 0.10"
+gleam_erlang = "~> 0.24"
+
+[dev-dependencies]
+gleeunit = "~> 1.0"
diff --git a/codingquest2024/manifest.toml b/codingquest2024/manifest.toml
new file mode 100644
index 0000000..55b1f61
--- /dev/null
+++ b/codingquest2024/manifest.toml
@@ -0,0 +1,17 @@
+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "gleam_erlang", version = "0.24.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "26BDB52E61889F56A291CB34167315780EE4AA20961917314446542C90D1C1A0" },
+  { name = "gleam_otp", version = "0.10.0", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_stdlib"], otp_app = "gleam_otp", source = "hex", outer_checksum = "0B04FE915ACECE539B317F9652CAADBBC0F000184D586AAAF2D94C100945D72B" },
+  { name = "gleam_stdlib", version = "0.36.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "C0D14D807FEC6F8A08A7C9EF8DFDE6AE5C10E40E21325B2B29365965D82EB3D4" },
+  { name = "gleeunit", version = "1.0.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "D364C87AFEB26BDB4FB8A5ABDE67D635DC9FA52D6AB68416044C35B096C6882D" },
+  { name = "simplifile", version = "1.5.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "EB9AA8E65E5C1E3E0FDCFC81BC363FD433CB122D7D062750FFDF24DE4AC40116" },
+]
+
+[requirements]
+gleam_erlang = { version = "~> 0.24"}
+gleam_otp = { version = "~> 0.10" }
+gleam_stdlib = { version = "~> 0.34 or ~> 1.0" }
+gleeunit = { version = "~> 1.0" }
+simplifile = { version = "~> 1.5" }
diff --git a/codingquest2024/src/codingquest2024.gleam b/codingquest2024/src/codingquest2024.gleam
new file mode 100644
index 0000000..5af4a2a
--- /dev/null
+++ b/codingquest2024/src/codingquest2024.gleam
@@ -0,0 +1,5 @@
+import gleam/io
+
+pub fn main() {
+  io.println("Hello from codingquest2024!")
+}
diff --git a/codingquest2024/src/day1/solution.gleam b/codingquest2024/src/day1/solution.gleam
new file mode 100644
index 0000000..abef2eb
--- /dev/null
+++ b/codingquest2024/src/day1/solution.gleam
@@ -0,0 +1,55 @@
+import gleam/dict.{type Dict}
+import gleam/int
+import gleam/io
+import gleam/list
+import gleam/option.{None, Some}
+import gleam/regex
+import gleam/result
+import gleam/string
+import simplifile
+
+pub type Adjustment {
+  Adjustment(spaceliner: String, value: Int)
+}
+
+pub fn main() {
+  let assert Ok(data) = simplifile.read(from: "./src/day1/data.txt")
+
+  let raw_adjustments = string.split(data, "\n")
+
+  raw_adjustments
+  |> collate_adjustments
+  |> dict.values
+  |> list.reduce(with: int.min)
+  |> result.unwrap(0)
+  |> int.to_string()
+  |> io.println()
+}
+
+fn parse_line(line: String) -> Adjustment {
+  let assert Ok(re) = regex.from_string("[\\s:]+")
+
+  let assert [spaceliner, kind, raw_value] =
+    regex.split(with: re, content: line)
+
+  let assert Ok(value) = int.parse(raw_value)
+  Adjustment(spaceliner, classify_adjustment(kind) * value)
+}
+
+fn classify_adjustment(name: String) -> Int {
+  case name {
+    "Seat" | "Meals" | "Luggage" | "Fee" | "Tax" -> 1
+    "Discount" | "Rebate" -> -1
+    _ -> panic as "unknown adjustment kind"
+  }
+}
+
+fn collate_adjustments(raw_adjustments: List(String)) -> Dict(String, Int) {
+  use acc, this <- list.fold(over: raw_adjustments, from: dict.new())
+  let adjustment = parse_line(this)
+  use maybe_v <- dict.update(in: acc, update: adjustment.spaceliner)
+  case maybe_v {
+    None -> adjustment.value
+    Some(v) -> v + adjustment.value
+  }
+}
diff --git a/codingquest2024/src/day2/solution.gleam b/codingquest2024/src/day2/solution.gleam
new file mode 100644
index 0000000..59f8d29
--- /dev/null
+++ b/codingquest2024/src/day2/solution.gleam
@@ -0,0 +1,66 @@
+import gleam/bit_array
+import gleam/list
+import gleam/int
+import gleam/io
+import gleam/string
+import simplifile
+
+pub type Location {
+  Internal
+  Passenger
+  Other
+}
+
+pub type Packet {
+  Packet(length: Int, endpoint: Location)
+}
+
+pub fn main() {
+  let assert Ok(data) = simplifile.read(from: "./src/day2/data.txt")
+
+  let #(internal_packets, passenger_packets) =
+    data
+    |> string.split("\n")
+    |> list.map(parse_packet)
+    |> list.partition(fn(p) { p.endpoint == Internal })
+
+  {
+    int.to_string(sum_packet_lengths(internal_packets))
+    <> "/"
+    <> int.to_string(sum_packet_lengths(passenger_packets))
+  }
+  |> io.println()
+}
+
+fn parse_packet(raw_packet: String) {
+  let assert Ok(<<
+    _:bytes-size(2),
+    length:int-size(16),
+    _:bytes-size(8),
+    source:bytes-size(4),
+    destination:bytes-size(4),
+  >>) = bit_array.base16_decode(raw_packet)
+
+  Packet(length, set_endpoint(source, destination))
+}
+
+fn set_endpoint(source: BitArray, dest: BitArray) -> Location {
+  case identify_location(source), identify_location(dest) {
+    Other, Internal | Internal, Other -> Internal
+    Other, Passenger | Passenger, Other -> Passenger
+    _, _ -> Other
+  }
+}
+
+fn identify_location(ip: BitArray) -> Location {
+  case ip {
+    <<192, 168, _, _>> -> Internal
+    <<10, 0, _, _>> -> Passenger
+    _ -> Other
+  }
+}
+
+fn sum_packet_lengths(packets: List(Packet)) -> Int {
+  use acc, p <- list.fold(packets, 0)
+  acc + p.length
+}
diff --git a/codingquest2024/src/day3/solution.gleam b/codingquest2024/src/day3/solution.gleam
new file mode 100644
index 0000000..6314060
--- /dev/null
+++ b/codingquest2024/src/day3/solution.gleam
@@ -0,0 +1,50 @@
+import gleam/bit_array
+import gleam/int
+import gleam/io
+import gleam/string
+import gleam/string_builder.{type StringBuilder}
+import simplifile
+
+pub fn main() {
+  let assert Ok(data) = simplifile.read(from: "./src/day3/data.txt")
+
+  data
+  |> string.split(" ")
+  |> build_flat_image(" ", string_builder.new())
+  |> bit_array.from_string()
+  |> print_next_slice()
+}
+
+fn build_flat_image(
+  nums: List(String),
+  pixel: String,
+  acc: StringBuilder,
+) -> String {
+  case nums {
+    [] -> string_builder.to_string(acc)
+    [h, ..t] -> {
+      let assert Ok(n) = int.parse(h)
+      let pixels = string.repeat(pixel, n)
+      build_flat_image(t, next_pixel(pixel), string_builder.append(acc, pixels))
+    }
+  }
+}
+
+fn print_next_slice(str: BitArray) -> Nil {
+  case str {
+    <<slice:bytes-size(100), rest:bytes>> -> {
+      let assert Ok(out) = bit_array.to_string(slice)
+      io.println(out)
+      print_next_slice(rest)
+    }
+    _ -> Nil
+  }
+}
+
+fn next_pixel(p: String) -> String {
+  case p {
+    " " -> "#"
+    "#" -> " "
+    _ -> panic
+  }
+}
diff --git a/codingquest2024/src/day4/solution.gleam b/codingquest2024/src/day4/solution.gleam
new file mode 100644
index 0000000..a03b2be
--- /dev/null
+++ b/codingquest2024/src/day4/solution.gleam
@@ -0,0 +1,49 @@
+import gleam/float
+import gleam/io
+import gleam/list
+import gleam/regex
+import gleam/result
+import gleam/string
+import simplifile
+
+pub type Star {
+  Star(name: String, x: Float, y: Float, z: Float)
+}
+
+pub fn main() {
+  let assert Ok(data) = simplifile.read(from: "./src/day4/data.txt")
+
+  let assert [_, ..stars] = string.split(data, "\n")
+
+  stars
+  |> list.map(parse_star_record)
+  |> list.combination_pairs()
+  |> list.map(star_distance)
+  |> list.reduce(float.min)
+  |> io.debug
+}
+
+fn parse_star_record(str: String) -> Star {
+  let assert Ok(re) = regex.from_string("\\s{2,}")
+
+  let assert [name, ..coords] = regex.split(with: re, content: str)
+  let assert [_, x, y, z] =
+    coords
+    |> list.map(float.parse)
+    |> result.values
+
+  Star(name, x, y, z)
+}
+
+fn star_distance(stars: #(Star, Star)) -> Float {
+  let #(star1, star2) = stars
+  let assert Ok(dist) =
+    float.square_root(
+      sq(star1.x -. star2.x) +. sq(star1.y -. star2.y) +. sq(star1.z -. star2.z),
+    )
+  dist
+}
+
+fn sq(x: Float) -> Float {
+  x *. x
+}
diff --git a/codingquest2024/src/day5/solution.gleam b/codingquest2024/src/day5/solution.gleam
new file mode 100644
index 0000000..6c10693
--- /dev/null
+++ b/codingquest2024/src/day5/solution.gleam
@@ -0,0 +1,67 @@
+import gleam/dict.{type Dict}
+import gleam/io
+import gleam/int
+import gleam/list
+import gleam/regex
+import gleam/result
+import gleam/string
+import simplifile
+
+type Atlas =
+  Dict(String, Dict(String, Int))
+
+pub fn main() {
+  let assert Ok(data) = simplifile.read(from: "./src/day5/data.txt")
+
+  let assert [table, routes] = string.split(data, "\n\n")
+  let assert [header, ..rows] = string.split(table, "\n")
+
+  let dests =
+    header
+    |> string.trim()
+    |> split_on_many_spaces
+
+  let atlas = build_atlas(rows, dests)
+
+  routes
+  |> string.split("\n")
+  |> list.fold(0, fn(acc, route) { acc + find_total_distance(route, atlas) })
+  |> io.debug
+}
+
+fn split_on_many_spaces(str) {
+  let assert Ok(re_spaces) = regex.from_string("\\s+")
+  regex.split(re_spaces, str)
+}
+
+fn build_atlas(rows, dests) {
+  rows
+  |> list.map(split_on_many_spaces)
+  |> list.fold(dict.new(), fn(acc, row) {
+    let assert [from, ..raw_dists] = row
+    let assert Ok(dists) = list.try_map(raw_dists, int.parse)
+    let to_dict =
+      dests
+      |> list.zip(dists)
+      |> dict.from_list()
+
+    dict.insert(acc, from, to_dict)
+  })
+}
+
+fn dist_between(leg: #(String, String), dict: Atlas) -> Int {
+  let assert Ok(dist) =
+    dict
+    |> dict.get(leg.0)
+    |> result.try(dict.get(_, leg.1))
+
+  dist
+}
+
+fn find_total_distance(row: String, atlas: Atlas) {
+  let assert [_, route] = string.split(row, ": ")
+
+  string.split(route, " -> ")
+  |> list.window_by_2
+  |> list.fold(0, fn(acc, leg) { acc + dist_between(leg, atlas) })
+}
diff --git a/codingquest2024/src/day6/solution.gleam b/codingquest2024/src/day6/solution.gleam
new file mode 100644
index 0000000..8a0319c
--- /dev/null
+++ b/codingquest2024/src/day6/solution.gleam
@@ -0,0 +1,86 @@
+import gleam/dict
+import gleam/io
+import gleam/list
+import gleam/regex
+import gleam/result
+import gleam/string
+import simplifile
+
+pub opaque type Location {
+  Location(row: Int, col: Int)
+}
+
+pub fn main() {
+  let assert Ok(data) = simplifile.read(from: "./src/day6/data.txt")
+  let assert ["Cipher key: " <> key, "Message: " <> raw_message] =
+    string.split(data, "\n")
+
+  let letter_to_location = make_cipher_grid(key)
+  let location_to_letter =
+    letter_to_location
+    |> dict.fold(dict.new(), fn(acc, k, v) { dict.insert(acc, v, k) })
+
+  raw_message
+  |> string.split(" ")
+  |> list.map(fn(s) {
+    s
+    |> string.to_graphemes
+    |> list.sized_chunk(2)
+  })
+  |> list.map(fn(s) {
+    s
+    |> decode_word(letter_to_location, location_to_letter)
+    |> string.concat()
+  })
+  |> string.join(" ")
+  |> io.println()
+}
+
+fn make_cipher_grid(key) {
+  let assert Ok(in_key) = regex.from_string("[" <> key <> "]")
+  let grid =
+    regex.split(in_key, "abcdefghiklmnopqrstuvwxyz")
+    |> string.concat
+    |> string.append(key, _)
+    |> string.to_graphemes
+    |> list.sized_chunk(5)
+
+  list.index_map(grid, fn(row, r) {
+    list.index_map(row, fn(cell, c) { #(cell, Location(r, c)) })
+  })
+  |> list.flatten
+  |> dict.from_list
+}
+
+fn decode_word(word: List(List(String)), to_loc, to_letter) {
+  case word {
+    [] -> []
+    [[a, b], ..rest] -> [
+      transform_pair(a, b, to_loc, to_letter),
+      ..decode_word(rest, to_loc, to_letter)
+    ]
+    _ -> panic as "bad playfair format"
+  }
+}
+
+fn transform_pair(a, b, to_loc, to_letter) {
+  let assert Ok(Location(r_a, c_a)) = dict.get(to_loc, a)
+  let assert Ok(Location(r_b, c_b)) = dict.get(to_loc, b)
+
+  case r_a == r_b, c_a == c_b {
+    True, _ -> [
+      dict.get(to_letter, Location(r_a, { c_a + 4 } % 5)),
+      dict.get(to_letter, Location(r_b, { c_b + 4 } % 5)),
+    ]
+    _, True -> [
+      dict.get(to_letter, Location({ r_a + 4 } % 5, c_a)),
+      dict.get(to_letter, Location({ r_b + 4 } % 5, c_b)),
+    ]
+    _, _ -> [
+      dict.get(to_letter, Location(r_a, c_b)),
+      dict.get(to_letter, Location(r_b, c_a)),
+    ]
+  }
+  |> result.values
+  |> string.concat
+}
diff --git a/codingquest2024/src/day7/solution.gleam b/codingquest2024/src/day7/solution.gleam
new file mode 100644
index 0000000..2ca7cbf
--- /dev/null
+++ b/codingquest2024/src/day7/solution.gleam
@@ -0,0 +1,73 @@
+import gleam/io
+import gleam/string
+import gleam/set.{type Set}
+import gleam/int
+import gleam/regex.{Match}
+import gleam/option.{Some}
+import simplifile
+
+pub opaque type Item {
+  File(name: String, size: Int)
+  Directory(name: String)
+}
+
+pub fn main() {
+  let assert Ok(data) = simplifile.read(from: "./src/day7/data.txt")
+  let lines = string.split(data, "\n")
+
+  mark_for_deletion(lines, 0, "", set.new())
+  |> io.debug()
+}
+
+fn mark_for_deletion(
+  lines: List(String),
+  deleted: Int,
+  current_folder: String,
+  deleted_folders: Set(String),
+) {
+  case lines {
+    [] -> deleted
+    ["Folder: " <> folder, ..rest] ->
+      mark_for_deletion(rest, deleted, folder, deleted_folders)
+    [file, ..rest] -> {
+      case
+        string.contains(file, "temporary")
+        || string.contains(file, "delete")
+        || set.contains(deleted_folders, current_folder)
+      {
+        True ->
+          case string.contains(file, "[FOLDER") {
+            True -> {
+              file
+              |> get_folder_number()
+              |> set.insert(deleted_folders, _)
+              |> mark_for_deletion(rest, deleted, current_folder, _)
+            }
+            False -> {
+              file
+              |> get_file_size()
+              |> int.add(deleted, _)
+              |> mark_for_deletion(rest, _, current_folder, deleted_folders)
+            }
+          }
+        False ->
+          mark_for_deletion(rest, deleted, current_folder, deleted_folders)
+      }
+    }
+  }
+}
+
+fn get_folder_number(file) {
+  let assert Ok(re) = regex.from_string("\\[FOLDER ([0-9]+)\\]")
+
+  let assert [Match(submatches: [Some(n)], ..)] = regex.scan(re, file)
+  n
+}
+
+fn get_file_size(file) {
+  let assert Ok(re) = regex.from_string("- .+ ([0-9]+)$")
+
+  let assert [Match(submatches: [Some(n)], ..)] = regex.scan(re, file)
+  let assert Ok(n) = int.parse(n)
+  n
+}
diff --git a/codingquest2024/src/day8/solution.gleam b/codingquest2024/src/day8/solution.gleam
new file mode 100644
index 0000000..cb4d907
--- /dev/null
+++ b/codingquest2024/src/day8/solution.gleam
@@ -0,0 +1,26 @@
+import gleam/io
+import gleam/int
+import gleam/list
+import utilities/memo
+
+const options = [40, 12, 2, 1]
+
+const distance = 856
+
+pub fn main() {
+  use cache <- memo.create()
+  solve(distance, cache)
+  |> io.debug
+}
+
+fn solve(target, cache) {
+  use <- memo.memoize(cache, target)
+  case target {
+    0 -> 1
+    _ ->
+      options
+      |> list.filter(fn(n) { n <= target })
+      |> list.map(fn(n) { solve(target - n, cache) })
+      |> int.sum
+  }
+}
diff --git a/codingquest2024/src/day9/input.txt b/codingquest2024/src/day9/input.txt
new file mode 100644
index 0000000..1d30914
--- /dev/null
+++ b/codingquest2024/src/day9/input.txt
@@ -0,0 +1,203 @@
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\ No newline at end of file
diff --git a/codingquest2024/src/day9/solution.gleam b/codingquest2024/src/day9/solution.gleam
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/codingquest2024/src/day9/solution.gleam
diff --git a/codingquest2024/src/utilities/memo.gleam b/codingquest2024/src/utilities/memo.gleam
new file mode 100644
index 0000000..b06d8fd
--- /dev/null
+++ b/codingquest2024/src/utilities/memo.gleam
@@ -0,0 +1,57 @@
+import gleam/dict.{type Dict}
+import gleam/otp/actor.{type Next, Continue, Stop}
+import gleam/erlang/process.{type Subject, Normal}
+import gleam/option.{None}
+
+const timeout = 1000
+
+type Message(k, v) {
+  Shutdown
+  Get(key: k, client: Subject(Result(v, Nil)))
+  Set(key: k, value: v)
+}
+
+type Server(k, v) =
+  Subject(Message(k, v))
+
+pub opaque type Cache(k, v) {
+  Cache(server: Server(k, v))
+}
+
+fn handle_message(
+  message: Message(k, v),
+  dict: Dict(k, v),
+) -> Next(Message(k, v), Dict(k, v)) {
+  case message {
+    Shutdown -> Stop(Normal)
+    Get(key, client) -> {
+      process.send(client, dict.get(dict, key))
+      Continue(dict, None)
+    }
+    Set(key, value) -> Continue(dict.insert(dict, key, value), None)
+  }
+}
+
+pub fn create(apply fun: fn(Cache(k, v)) -> t) -> t {
+  let assert Ok(server) = actor.start(dict.new(), handle_message)
+  let result = fun(Cache(server))
+  process.send(server, Shutdown)
+  result
+}
+
+pub fn set(in cache: Cache(k, v), for key: k, insert value: v) -> Nil {
+  process.send(cache.server, Set(key, value))
+}
+
+pub fn get(from cache: Cache(k, v), fetch key: k) -> Result(v, Nil) {
+  process.call(cache.server, fn(c) { Get(key, c) }, timeout)
+}
+
+pub fn memoize(with cache: Cache(k, v), this key: k, apply fun: fn() -> v) -> v {
+  let result = case get(from: cache, fetch: key) {
+    Ok(value) -> value
+    Error(Nil) -> fun()
+  }
+  set(in: cache, for: key, insert: result)
+  result
+}
diff --git a/codingquest2024/test/codingquest2024_test.gleam b/codingquest2024/test/codingquest2024_test.gleam
new file mode 100644
index 0000000..3831e7a
--- /dev/null
+++ b/codingquest2024/test/codingquest2024_test.gleam
@@ -0,0 +1,12 @@
+import gleeunit
+import gleeunit/should
+
+pub fn main() {
+  gleeunit.main()
+}
+
+// gleeunit test functions end in `_test`
+pub fn hello_world_test() {
+  1
+  |> should.equal(1)
+}