Commit 3c51e47

@@ -0,0 +1,30 @@
+<<-DOC
+[2:10 PM] Marvin Liu: You are given a single linked list, and you are asked to determine if there is a circle inside it
+[2:11 PM] Marvin Liu: A circle means, a -> b -> c -> b, then it is a circle
+DOC
+
+def circle?(head)
+  true
+end
+
+class Node
+  attr_reader :next_item, :value
+
+  def initialize(value)
+    @value
+  end
+
+  def add(value)
+    @next_item = value.is_a?(Node) ? value : Node.new(value)
+  end
+end
+
+a = Node.new("A")
+b = Node.new("B")
+c = Node.new("C")
+
+a.add(b)
+b.add(c)
+c.add(b)
+
+raise 'heck' unless circle?(a)