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Data Structures & Alogs HW_Part_11

Data Structures & Alogs HW_Part_11 - 41...

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41 if (t1->val() != t2->val()) return false; if (Compare2(t1->leftchild(), t2->leftchild()) if (Compare2(t1->rightchild(), t2->rightchild()) return true; if (Compare2(t1->leftchild(), t2->rightchild()) if (Compare2(t1->rightchild(), t2->leftchild)) return true; return false; } 6.3 template <class Elem> // Print, postorder traversal void postprint(GTNode<Elem>* subroot) { for (GTNode<Elem>* temp = subroot->leftmost_child(); temp != NULL; temp = temp->right_sibling()) postprint(temp); if (subroot->isLeaf()) cout << "Leaf: "; else cout << "Internal: "; cout << subroot->value() << "\n"; } 6.4 template <class Elem> // Count the number of nodes int gencount(GTNode<Elem>* subroot) { if (subroot == NULL) return 0 int count = 1; GTNode<Elem>* temp = rt->leftmost_child(); while (temp != NULL) { count += gencount(temp); temp = temp->right_sibling(); } return count; } 6.5 The Weighted Union Rule requires that when two parent-pointer trees are merged, the smaller one’s root becomes a child of the larger one’s root. Thus, we need to keep track of the number of nodes in a tree. To do so, modify the node array to store an integer value with each node. Initially, each node is in its own tree, so the weights for each node begin as 1. Whenever we wish to merge two trees, check the weights of the roots to determine which has more nodes. Then, add to the weight of the fi nal root the weight of the new subtree.
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