@Navneet, What you are talking about are "quasi-isomorphic" trees where trees can be changed a bit (flip right/left sub-trees to be precise) to make them isomorphic. An "isomorphic" tree does not need any transformation, they are similar in structure by themselves.
On Aug 28, 1:44 pm, Navneet <[email protected]> wrote: > @Dave, > > From the definition of isomorphic trees(not in ques given), what i > know of is that one can be transformed into another. The above three > are then isomorphic to each other. > > @Bugaboo, can you clarify what exactly do you mean by isomorphic > here? > > On Aug 28, 9:25 pm, Dave <[email protected]> wrote: > > > > > > > > > @Naveet: So we have a question of semantics. Do these three trees have > > the same structure: > > > a > > / > > b > > / > > c > > > and > > > a > > \ > > b > > \ > > c > > > and > > > a > > \ > > b > > / > > c > > > I say "no," but perhaps you say "yes." > > > Dave > > > On Aug 28, 9:35 am, Navneet <[email protected]> wrote: > > > > Dave, that is why i have an OR condition between. Each side of OR has > > > two calls with AND in between. > > > > Basically at any node, you will have to invoke with two combinations > > > ((left,left) AND (right,right) OR (left,right) AND (right,left)) > > > > Let me know if you think that's not required. > > > > On Aug 28, 6:02 pm, Dave <[email protected]> wrote: > > > > > @Navneet: Don't we want both subtrees to be isomorphic? > > > > > Dave > > > > > On Aug 28, 6:40 am, Navneet <[email protected]> wrote: > > > > > > Dave, > > > > > > I think the last condition should be > > > > > > return (AreIsomorphic(tree1->left, tree2->left) && > > > > > AreIsomorphic(tree1->right,tree2->right)) || > > > > > > (AreIsomorphic(tree1->left, tree2->right) && > > > > > AreIsomorphic(tree1->right,tree2->left)) > > > > > > On Aug 28, 3:39 pm, Ankur Garg <[email protected]> wrote: > > > > > > > Daves solution looks cool to me...shud work :) > > > > > > > Nice one Dave :) > > > > > > > Regards > > > > > > Ankur > > > > > > > On Sun, Aug 28, 2011 at 4:08 PM, Ankur Garg <[email protected]> > > > > > > wrote: > > > > > > > cant we just count the no of nodes in each level and compare them > > > > > > > with the > > > > > > > second one.. > > > > > > > > if the numbers are same trees can be said to be isomorphic > > > > > > > > On Sun, Aug 28, 2011 at 3:54 AM, Dave <[email protected]> > > > > > > > wrote: > > > > > > > >> @Bugaboo: Use recursion. Assuming > > > > > > > >> struct tree_node { > > > > > > >> tree_node *left; > > > > > > >> tree_node *right; > > > > > > >> int data; > > > > > > >> }; > > > > > > > >> int AreIsomorphic(tree_node tree1, tree_node tree2) > > > > > > >> { > > > > > > >> if( tree1 == NULL && tree2 == NULL ) > > > > > > >> return TRUE; // both trees are null > > > > > > >> if( tree1 == NULL || tree2 == NULL) > > > > > > >> return FALSE; // one tree is null, the other is not > > > > > > >> return AreIsomorphic(tree1->left,tree2->left) && > > > > > > >> AreIsomorphic(tree1->right,tree2->right); > > > > > > >> } > > > > > > > >> Dave > > > > > > > >> On Aug 27, 12:05 pm, bugaboo <[email protected]> wrote: > > > > > > >> > Considering the definition of binary tree isomorphism is the > > > > > > >> > following: > > > > > > >> > - 2 binary trees are isomorphic if they have the same > > > > > > >> > structure but > > > > > > >> > differ just by values. > > > > > > > >> > What is the logic (or pseudo code) for checking if two binary > > > > > > >> > trees > > > > > > >> > are isomorphic? > > > > > > > >> -- > > > > > > >> You received this message because you are subscribed to the > > > > > > >> Google Groups > > > > > > >> "Algorithm Geeks" group. > > > > > > >> To post to this group, send email to [email protected]. > > > > > > >> To unsubscribe from this group, send email to > > > > > > >> [email protected]. > > > > > > >> For more options, visit this group at > > > > > > >>http://groups.google.com/group/algogeeks?hl=en.-Hidequotedtext- > > > > > > - Show quoted text -- 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
