ruby - alphametics

ruby/alphametics/alphametics.rb

@@ -0,0 +1,12 @@
+# Alphametics class
+class Alphametics
+  def self.solve(puzzle)
+    chars = puzzle.chars & ('A'..'Z').to_a
+    (0..9).to_a.permutation(chars.length).each do |numbers|
+      equation = puzzle.tr(chars.join, numbers.join)
+      next if equation =~ /\b0/
+      return Hash[chars.zip(numbers)] if eval(equation)
+    end
+    {}
+  end
+end