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二叉树的高度

进击的铁雾 2022-03-11 阅读 61
#include<iostream>

using namespace std;

struct BstNode
{
	int data;
	BstNode* left;
	BstNode* right;
};

BstNode* GetNewNode(int data)
{
	BstNode* newNode = new BstNode;
	newNode->data = data;
	newNode->left = newNode->right = NULL;
	return newNode;
}

BstNode* Insert(BstNode* root, int data)
{
	if(root == NULL)//数是空的
	{
		root = GetNewNode(data);
		return root; 	
	}
	
	else if(data <= root->data)
		root->left = Insert(root->left,data);
		 
	else root->right = Insert(root->right,data);
	return root; 
}

int FindHeight(BstNode* root)//时间复杂度O(n)
{
	if(root == NULL) return -1;
	return max(FindHeight(root->left),FindHeight(root->right)) + 1;
}

int main()
{
	BstNode* root = NULL;//表示树是空的
	root = Insert(root,15);
	root = Insert(root,10);
	root = Insert(root,20);
	root = Insert(root,25);
	root = Insert(root,8);
	root = Insert(root,12);  
	
	int height = FindHeight(root);
	printf("The height of tree is %d \n", height );
	return 0;
}

 

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