day08

3 files changed, 242 insertions, 0 deletions

diff --git a/day08 b/day08
new file mode 100644
index 0000000..657ffd4
--- /dev/null
+++ b/day08
@@ -0,0 +1,200 @@
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+fe bdcge ecfbdg ecf bdfe gdacbe gdefcab gfcad cdgef ceagbf | ef bdceg begdafc efgdc
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+agbef aebcfg cegfb ba adfeg bgac fdbcea ebcadgf bea gcdfeb | gcfbe bae eba feadcb
+gdbeca beadc eagb ecdgb cefdbg adefbgc fedgac aec ae dfacb | ae ea eacgdfb cfaedg
+egfdb ebgcda ceadbfg cfdgea aeb ba cbegaf agbef cfage cbfa | ab aeb fabc efabcgd
+fbaecgd bdafc dcgbf fgc bgca cg fcbgda gfdbe fadbec gadcfe | dbcfg gefdb gc dacbfeg
+ge gbced efabgd dbagec gbe agce agbdcf dbcef cgfaedb abcdg | bcgedfa efcbd dfgcba cdefb
+dcafbg cfegdb gfdeb dbegaf fab abcedfg gbae fdaec adbfe ba | fcdegba fegabd ab gfcabd
+gfe fcbe bgdfce gcdbe gedbf cadegb ceagbfd cadfge ef gdbfa | gfdab cfbe bcegd gfe
+bdcfae fbecd ecgdab afcd acefb edgfcb acb ca abfdceg egafb | ca edcfb dcfeb cfbeda
+dacb edfba cdbgeaf eadfg ecgfbd db ecabgf ceadbf acebf bfd | faebd dbca afecbg fegbca
+cdabe edfgca cgefb cfabed cfdbe cfd edabgc ecafbgd dfab fd | gdebac ecdba adfb bcefad
+dcgbe gdfeab efca gbdacf fcedb fcd efadcb dbefa fc cegbdfa | fdc fdebca abedf afce
+cdbfage fadc bdefga cafegb dag facgb da ebcgd gabcd abcdgf | afbgc edfabg ad bcadg
+cfgedba gdafec gafdb fecb aedcbf cbead deagbc adfbc dfc fc | acbfd cbgfaed facedg fcd
+gdea gdafbc dfebc gefdc feg ge gfceda cfdga fabegc cbgfead | ecgdf gfe dfceb afcegd
+adbfg ebcfg cdbafe acfbdeg cgea gaefb dgbcfe bea bcafge ae | febgc ae ea bea
+dcfaeg dcfbag gfcdeba fagb dgacb fgc cedbf fcgdb dbacge gf | fg fbcgd dcgafe fadgbc
diff --git a/day08.bqn b/day08.bqn
new file mode 100644
index 0000000..d9f1ac0
--- /dev/null
+++ b/day08.bqn
@@ -0,0 +1,9 @@
+str←•Import"bqn-libs/strings.bqn"
+Dec←(10⊸×+⊣)´∘⌽
+d ← 'a'-˜" "⊸str.Split¨¨ " | "⊸str.Split¨ •FLines"day08"
+
+•Out +´ 2‿3‿4‿7 ∊˜ ≠¨∾1⊑¨d
+
+c ← 'a'-˜"abcefg"‿"cf"‿"acdeg"‿"acdfg"‿"bdcf"‿"abdfg"‿"abdefg"‿"acf"‿"abcdefg"‿"abcdfg"
+P2 ← { ∧∘⊏⟜(+˝(∾𝕨)=⌜↕7)¨𝕩 }
+•Out +´Dec¨((P2˜ c) ⊐ P2´)¨d
diff --git a/day08.clj b/day08.clj
new file mode 100644
index 0000000..18091d8
--- /dev/null
+++ b/day08.clj
@@ -0,0 +1,33 @@
+(ns org.vuxu.aoc2021.day08
+  (:require [clojure.string :as str]
+            [clojure.set :as set]))
+
+(def data
+  (->> (slurp "day08")
+       str/split-lines
+       (map #(str/split % #" \| " 2))
+       (map (partial map #(str/split % #" ")))))
+  
+(def part1
+  (->> data
+       (map second)
+       flatten
+       (map count)
+       (filter #{2 4 3 7})   ; LCD 1 4 7 8
+       count))
+;; => 342
+
+(def part2
+  (let [canonical-pattern ["abcefg" "cf" "acdeg" "acdfg" "bdcf"
+                           "abdfg" "abdefg" "acf" "abcdefg" "abcdfg"]
+        freq (frequencies (apply str canonical-pattern))
+        dict (zipmap (map #(sort (map freq %)) canonical-pattern)
+                     (range 10))]
+    (apply + (for [[digits output] data]
+               (let [line-freq (frequencies (apply str digits))]
+                 (->> output
+                      (map #(sort (map line-freq %)))
+                      (map dict)
+                      (apply str)
+                      parse-long))))))
+;; => 1068933