[2024][ruby][1.x]
diff --git a/2024/ruby/day_01.rb b/2024/ruby/day_01.rb
new file mode 100644
index 0000000..546d620
--- /dev/null
+++ b/2024/ruby/day_01.rb
@@ -0,0 +1,1014 @@
+input = DATA.read.chomp
+ .lines
+ .map { _1.split.map(&:to_i) }
+ .transpose
+ .map(&:sort)
+
+a, b = input
+
+# pp a.zip(b).map { _1 - _2 }.map(&:abs).sum
+
+b = b.tally
+pp a.sum { _1 * b.fetch(_1, 0) }
+
+__END__
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