1043 Is It a Binary Search Tree (25 分)。查找树的建立➕插入➕前后序遍历，都是模板一样的组合

#include<iostream>
#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=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> origine,pre,prem,post,postm;
int main(){
    int n,data;
    node* root=NULL;
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>data;
        origine.push_back(data);
        insert(root,data);
    }
    preorder(root,pre);
    preordermirror(root,prem);
    postorder(root,post);
    postordermirror(root,postm);
    if(origine==pre){
        if(origine==pre){
            cout<<"YES"<<endl;
            for(int i=0;i<post.size();i++){
                cout<<post[i];
                if(i!=post.size()-1) cout<<" ";
            }
        }
    }
    else if(origine==prem){
        cout<<"YES"<<endl;
        for(int i=0;i<postm.size();i++){
            cout<<postm[i];
            if(i<postm.size()-1) cout<<" ";
        }
    }
    else cout<<"NO"<<endl;
    return 0;
}

标签：1043,Binary,Search,right,node,data,vi,NULL,root
来源： https://blog.csdn.net/qq_42835526/article/details/113738504