Given Tree
TreeNode root = new TreeNode ( 0 ) ; root . left = new TreeNode ( 1 ) ; root . right = new TreeNode ( 0 ) ; root . left . left = new TreeNode ( 0 ) ; root . left . right = new TreeNode ( 1 ) ; root . right . left = new TreeNode ( 1 ) ; root . right . right = new TreeNode ( 1 ) ;