tasks a-s

Task/Non-continuous-subsequences/Ruby/non-continuous-subsequences.rb

@@ -0,0 +1,21 @@
+class Array
+  def func_power_set
+    inject([[]]) { |ps,item|    # for each item in the Array
+      ps +                      # take the powerset up to now and add
+      ps.map { |e| e + [item] } # it again, with the item appended to each element
+    }
+  end
+
+  def non_continuous_subsequences
+    func_power_set.find_all {|seq| not seq.continuous}
+  end
+
+  def continuous
+    each_cons(2) {|a, b| return false if a+1 != b}
+    true
+  end
+end
+
+p (1..3).to_a.non_continuous_subsequences
+p (1..4).to_a.non_continuous_subsequences
+p (1..5).to_a.non_continuous_subsequences