题目内容
2 Assuming that the number of nodes of a binary tree is 18, its height is at least ().
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3 The relative position of the leaf node of any binary tree in its preorder, inorder, and postorder sequence ().
4 The condition for judging that a node P in the threaded binary-tree has a left child is ().
5 Suppose there are 4 trees in the forest T, and the number of nodes is n1, n2,n3,n4 respectively, then when the forest T is converted into a binary tree, there are ( ) nodes on the right subtree of the root node.
6 Construct a Huffman tree from 4 leaf nodes with weights of 9, 2, 5 and 7, then the weighted path length of the tree is ().
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