Merge remote-tracking branch 'upstream/master'

1 files changed, 48 insertions, 0 deletions

diff --git a/challenge-109/abigail/ruby/ch-2.rb b/challenge-109/abigail/ruby/ch-2.rb
new file mode 100644
index 0000000000..faaa7b8489
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+++ b/challenge-109/abigail/ruby/ch-2.rb
@@ -0,0 +1,48 @@
+#!/usr/bin/ruby
+
+#
+# See ../README.md
+#
+ 
+#
+# Run as: ruby ch-2.rb < input-file
+#
+
+SIZE = 7
+
+#
+# Brute force all possibilities, with early returns.
+#
+ARGF . each_line do |_|
+    numbers = (_ . split) . map {|_| _ . to_i}
+
+    numbers . each_with_index do |a, a_i|
+        numbers . each_with_index do |b, b_i|
+            next if a_i == b_i
+            target = a + b
+            numbers . each_with_index do |c, c_i|
+                next if a_i == c_i || b_i == c_i
+                numbers . each_with_index do |d, d_i|
+                    next if a_i == d_i || b_i == d_i || c_i == d_i
+                    next if target != b + c + d
+                    numbers . each_with_index do |e, e_i|
+                        next if a_i == e_i || b_i == e_i || c_i == e_i ||
+                                d_i == e_i
+                        numbers . each_with_index do |f, f_i|
+                            next if a_i == f_i || b_i == f_i || c_i == f_i ||
+                                    d_i == f_i || e_i == f_i
+                            next if target != d + e + f
+                            numbers . each_with_index do |g, g_i|
+                                next if a_i == g_i || b_i == g_i ||
+                                        c_i == g_i || d_i == g_i ||
+                                        e_i == g_i || f_i == g_i
+                                next if target != f + g
+                                puts "#{a} #{b} #{c} #{d} #{e} #{f} #{g}"
+                            end
+                        end
+                    end
+                end
+            end
+        end
+    end
+end