http://commoninterview.com/Programming_Interview_Questions/write-the-method-void-cleannode-root-which-would-clean-nodes-but-don%E2%80%99t-use-the-recursion-/ The solution is to use an additional data structure such as Stack to maintain a list of unprocessed nodes, keep adding children to the stack, and then ... Thu, 03 Jun 2010 22:48:15 MDT en