BST—— Is it a Binary Search Tree

在这里插入图片描述

#include<stdio.h>
#include<vector>
using namespace std;
struct node{
    
    
	int data;
	node *left, *right;
};

void insert(node* &root, int data)
{
    
    
	if(root == NULL)
	{
    
    
		root = new node;
		root->data = data;
		root->left = NULL;
		root->right = NULL;
		return;
	}
	if(data < root->data) insert(root->left, data);
	else insert(root->right, data);
}

void preOrder(node* root, vector<int> &vi)
{
    
    
	if(root == NULL) return;
	vi.push_back(root->data);
	preOrder(root->left, vi);
	preOrder(root->right, vi); 
}

void preOrderMirror(node* root, vector<int> &vi)
{
    
    
	if(root == NULL) return;
	vi.push_back(root->data);
	preOrderMirror(root->right, vi);
	preOrderMirror(root->left, vi); 
}

void postOrder(node* root, vector<int> &vi)
{
    
    
	if(root == NULL) return;
	postOrder(root->left, vi);
	postOrder(root->right, vi);
	vi.push_back(root->data); 
}

void postOrderMirror(node* root, vector<int> &vi)
{
    
    
	if(root == NULL) return;
	postOrderMirror(root->right, vi);
	postOrderMirror(root->left, vi);
	vi.push_back(root->data); 
}

vector<int> origin, pre, preM, post, postM;

int main()
{
    
    
   int n, data;
   node* root = NULL;
   scanf("%d", &n);
   for(int i = 0; i < n; i++)
   {
    
    
       scanf("%d", &data);
	   origin.push_back(data);
	   insert(root, data); 	
   }	
   preOrder(root, pre);
   preOrderMirror(root, preM);
   postOrder(root, post);
   postOrder(root, postM);
   if(origin == pre)
   {
    
    
   	  printf("YES\n");
   	  for(int i = 0; i < post.size(); i++)
   	  {
    
    
   	     printf("%d", post[i]);	
   	     if(i < post.size() - 1) printf(" ");
	  }
   }
   else if(origin == preM){
    
    
   	  printf("YES\n");
   	  for(int i = 0; i < postM.size(); i++)
   	  {
    
    
   	     printf("%d", postM[i]);
		 if(i < postM.size() - 1) printf(" ");	
	  }
   } else printf("NO\n");
   return 0;
}

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转载自blog.csdn.net/tian__si/article/details/114280456