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sahnisol2-1

# sahnisol2-1 - Data Structures Algorithms Exam 2 Sample 1 75...

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Data Structures & Algorithms Exam 2, Sample 1 75 Minutes Solutions 1. (a) To perform the operation, we can do a postorder traversal of the binary tree. During the visit step, we exachange the left and right children of the node being visited. To implement this strategy we need to define a public and a private swapTree method. The public method can be defined as below: public void swapChildren() {swapChildren(root);} The private method is a class (i.e., static) method that does the actual swapping of children by performing a postorder traversal. The code is given below. private static void swapChildren(BinaryTreeNode t) {// Swap the children of every node in the subtree t. // Do a postorder traversal; swap left and right child // pointers in the visit step. if (t != null) { // swap in the left subtree swapChildren(t.leftChild); // swap in the right subtree swapChildren(t.rightChild); // swap children of t BinaryTreeNode temp = t.rightChild; t.rightChild = t.leftChild; t.leftChild = temp; } } (b)

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