Ruby solution for week 111, part 1

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diff --git a/challenge-111/abigail/ruby/ch-1.rb b/challenge-111/abigail/ruby/ch-1.rb
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+#!/usr/bin/ruby
+
+#
+# See ../README.md
+#
+ 
+#
+# Run as: ruby ch-1.rb < input-file
+#
+
+matrix_size = 5
+
+#
+# Read in the matrix
+#
+matrix = {}
+(1 .. matrix_size) . each do
+    ARGF . readline . scan(/-?[0-9]+/) do
+        |number|
+        matrix [number] = 1
+    end
+end
+
+
+#
+# Read in the rest of the numbers, and print 1/0 whether or
+# not they're present in the matrix.
+#
+ARGF . each_line do
+    |number|
+    puts (matrix [number . strip] ? 1 : 0)
+end