@Sagar: If you are not getting my logic, ask a question. Dave
On Jul 16, 12:35 pm, sagar pareek <sagarpar...@gmail.com> wrote: > Ok may be i m not getting ur logic... > > > > > > On Sat, Jul 16, 2011 at 11:03 PM, Dave <dave_and_da...@juno.com> wrote: > > @Sagar: No. I didn't say that they were in parallel or that one was > > inside the other. Go back and read it again and you will see that I > > said that they were being performed simultaneously, with each one > > being advanced in certain circumstances, and that in order to do that > > you would have to use explicit stacks instead of recursion. Perhaps, > > instead, you misread or misunderstood it. > > > Dave > > > On Jul 16, 12:24 pm, sagar pareek <sagarpar...@gmail.com> wrote: > > > ok i got it.... > > > actually u written wrong that f/w and reverse traversal are running > > > parallel > > > u must wrote that f/w traversal inside reverse or vice versa > > > > On Sat, Jul 16, 2011 at 10:35 PM, Dave <dave_and_da...@juno.com> wrote: > > > > @Sagar: No problem. The algorithm would do only forward traversal > > > > steps until it got to root_>left, whereupon F + R = K. > > > > > Dave > > > > > On Jul 16, 11:40 am, sagar pareek <sagarpar...@gmail.com> wrote: > > > > > @dave > > > > > what if the k= root->left + right most leaf ? > > > > > how ur algo works on it? > > > > > > On Sat, Jul 16, 2011 at 9:28 PM, Dave <dave_and_da...@juno.com> > > wrote: > > > > > > @Noobcoder: To do it in O(n) without destroying the BST, do two > > > > > > inorder traversals simultaneously, one in the normal forward (left > > > > > > subtree first) direction and one in the reverse direction (right > > > > > > subtree first). Let the two current nodes have value F and R > > > > > > respectively. If F + R = K, return success. If F = R, return > > failure. > > > > > > If F + R < K, advance the forward traversal. Otherwise (F + R > K), > > > > > > advance the reverse traversal. To do the traversals simultaneously, > > > > > > you will have to use explicit stacks instead of recursion. > > > > > > > Dave > > > > > > > On Jul 16, 9:01 am, noobcoder <ase.as...@gmail.com> wrote: > > > > > > > Given a BST containing integers, and a value K. You have to find > > two > > > > > > > nodes that give sum = K. > > > > > > > -- > > > > > > You received this message because you are subscribed to the Google > > > > Groups > > > > > > "Algorithm Geeks" group. > > > > > > To post to this group, send email to algogeeks@googlegroups.com. > > > > > > To unsubscribe from this group, send email to > > > > > > algogeeks+unsubscr...@googlegroups.com. > > > > > > For more options, visit this group at > > > > > >http://groups.google.com/group/algogeeks?hl=en. > > > > > > -- > > > > > **Regards > > > > > SAGAR PAREEK > > > > > COMPUTER SCIENCE AND ENGINEERING > > > > > NIT ALLAHABAD- Hide quoted text - > > > > > > - Show quoted text - > > > > > -- > > > > You received this message because you are subscribed to the Google > > Groups > > > > "Algorithm Geeks" group. > > > > To post to this group, send email to algogeeks@googlegroups.com. > > > > To unsubscribe from this group, send email to > > > > algogeeks+unsubscr...@googlegroups.com. > > > > For more options, visit this group at > > > >http://groups.google.com/group/algogeeks?hl=en. > > > > -- > > > **Regards > > > SAGAR PAREEK > > > COMPUTER SCIENCE AND ENGINEERING > > > NIT ALLAHABAD- Hide quoted text - > > > > - Show quoted text - > > > -- > > You received this message because you are subscribed to the Google Groups > > "Algorithm Geeks" group. > > To post to this group, send email to algogeeks@googlegroups.com. > > To unsubscribe from this group, send email to > > algogeeks+unsubscr...@googlegroups.com. > > For more options, visit this group at > >http://groups.google.com/group/algogeeks?hl=en. > > -- > **Regards > SAGAR PAREEK > COMPUTER SCIENCE AND ENGINEERING > NIT ALLAHABAD- Hide quoted text - > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
