Merge remote-tracking branch 'upstream/master'

2 files changed, 92 insertions, 0 deletions

diff --git a/challenge-109/abigail/ruby/ch-1.rb b/challenge-109/abigail/ruby/ch-1.rb
new file mode 100644
index 0000000000..0c73c368dd
--- /dev/null
+++ b/challenge-109/abigail/ruby/ch-1.rb
@@ -0,0 +1,44 @@
+#!/usr/bin/ruby
+
+#
+# See ../README.md
+#
+ 
+#
+# Run as: ruby ch-1.rb [plain | compute]
+#
+
+PLAIN   =  0
+COMPUTE =  1
+
+COUNT   = 20
+
+def divisor_sum (n)
+    sum = 0
+    for i in 2 .. n / 2
+        if   n % i == 0
+        then sum += i
+        end
+    end
+    return sum
+end
+
+type = PLAIN
+
+if   ARGV . length > 0 && ARGV[0] == "compute"
+then type = COMPUTE
+end
+
+if   type == PLAIN
+then puts ("0, 0, 0, 2, 0, 5, 0, 6, 3, 7, 0, 15, 0, 9, 8, 14, 0, 20, 0, 21");
+end
+
+if   type == COMPUTE
+then for n in 1 .. COUNT
+         if n > 1
+         then print (", ")
+         end
+         print divisor_sum (n)
+     end
+     puts ("")
+end
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
--- /dev/null
+++ 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