day03

3 files changed, 1043 insertions, 0 deletions

diff --git a/day03 b/day03
new file mode 100644
index 0000000..b19b6a2
--- /dev/null
+++ b/day03
@@ -0,0 +1,1000 @@
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diff --git a/day03.bqn b/day03.bqn
new file mode 100644
index 0000000..b68d8e2
--- /dev/null
+++ b/day03.bqn
@@ -0,0 +1,7 @@
+d←'0'-˜•FLines"day03"
+Dec←(2⊸×+⊣)´∘⌽
+
+•Out (2×+´⍉d)(≤×○Dec>)≠d
+
+_part2 ← { 1=≠𝕩 ? ⊑𝕩 ; (𝕨+1) 𝕊 𝕩/˜ =⟜(+´ 𝔽 ÷⟜2∘≠) 𝕨 ⊑¨ 𝕩 }
+•Out (0 ≥_part2 d) ×○Dec (0 <_part2 d)
diff --git a/day03.clj b/day03.clj
new file mode 100644
index 0000000..ca68729
--- /dev/null
+++ b/day03.clj
@@ -0,0 +1,36 @@
+(ns org.vuxu.aoc2021.day03
+  (:require [clojure.string :as str]))
+
+(defn parse-digit [char]
+  (Character/digit char 10))
+
+(defn bits->number [bits]
+  (Integer/parseInt (apply str bits) 2))
+
+(def data
+  (->> (slurp "day03")
+       (str/split-lines)
+       (mapv (partial mapv parse-digit))))
+
+(def part1
+  (let [gamma (->> data       
+                   (apply mapv +)
+                   (map #(if (>= % (/ (count data) 2)) 1 0)))
+        epsilon (map (partial - 1) gamma)]
+    (* (bits->number gamma) (bits->number epsilon))))
+;; => 2003336
+
+(def part2
+  (letfn [(helper [selector]
+            (loop [cands data
+                   i 0]
+              (let [freqs (->> cands
+                               (map #(get % i))
+                               frequencies)
+                    choice (if (selector (freqs 0 0) (freqs 1 0)) 1 0)
+                    new-cands (filter #(= (get % i) choice) cands)]
+            (if (> (count new-cands) 1)
+              (recur new-cands (inc i))
+              (bits->number (first new-cands))))))]
+    (* (helper <=) (helper >))))
+;; => 1877139