Add 2023 day 12, first part, sloooooow version

Author: bewuethr

2023/day12/day12a

@@ -0,0 +1,40 @@
+#!/usr/bin/env -S ruby -W0
+
+def to_list(record)
+  record.scan(/#+/).map(&:length).join(",")
+end
+
+def generate(record)
+  locs = record.chars.each_with_object([]).with_index do |(c, locs), idx|
+    locs << idx if c == "?"
+  end
+
+  warn "Question mark locations: #{locs}"
+
+  len = locs.length
+  warn "Generating #{2**len} patterns"
+  (0...2**len).to_a.map do |n|
+    arrangement = n.to_s(2).rjust(len, "0").tr("01", ".#")
+    new_record = record.clone
+    arrangement.chars.zip(locs).each { |spring, idx| new_record[idx] = spring }
+
+    new_record
+  end
+end
+
+file = File.open(ARGV[0])
+
+entries = file.readlines.map do |line|
+  (record, list) = line.split
+  {record:, list:}
+end
+
+sum_counts = entries.sum do |entry|
+  warn "Original: #{entry[:record]}"
+  generate(entry[:record]).count do |record|
+    warn "#{record} vs. #{entry[:list]}"
+    to_list(record) == entry[:list]
+  end
+end
+
+puts sum_counts