day 3

Author: schoblaska

03/a.rb

@@ -0,0 +1,12 @@
+prios = ["-"] + ("a".."z").to_a + ("A".."Z").to_a
+
+puts(
+  File
+    .readlines("03/input.txt", chomp: true)
+    .sum do |line|
+      chars = line.chars
+      half1, half2 = chars.each_slice(chars.size / 2).to_a
+      common = (half1 & half2).first
+      prios.index(common)
+    end
+)

03/b.rb

@@ -0,0 +1,8 @@
+prios = ["-"] + ("a".."z").to_a + ("A".."Z").to_a
+
+puts(
+  File
+    .readlines("03/input.txt", chomp: true)
+    .each_slice(3)
+    .sum { |lines| prios.index(lines.map(&:chars).reduce(&:&).first) }
+)

03/input.txt

@@ -0,0 +1,300 @@
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