#include<iostream>
using namespace std;
class Node{
    public:
    int val;
    Node *parent;
    Node *left;
    Node *right;
};
 
class binarysearchtree
{
    Node *root;
 
public:
 
    binarysearchtree(){
        root =NULL;
    }
 
    void insertdata(int val)
    {
        Node *newnode=new Node;
        newnode->val=val;
        newnode->parent=NULL;
        newnode->left=NULL;
        newnode->right=NULL;
 
        if(root==NULL)
        {
            root=newnode;
        }
        else{
            Node *temp=root;
            Node *prev=NULL;
            while(temp!=NULL)
            {
                prev=temp;
                if(val < temp->val)
                {
                    temp=temp->left;
                }
                else{
                    temp=temp->right;
                }
            }
            temp=newnode;
            newnode->parent=prev;
            if(val < prev->val)
            {
                prev->left=newnode;
            }
            else{
                prev->right=newnode;
            }
           // cout<<prev->val<<" "<<newnode->val<<endl;
        }
    }
 
    Node* searchdata(int val)
    {
        Node *temp=root;
        while(temp!=NULL)
        {
            if(temp->val==val) return temp;
            if(val<temp->val)
            {
                temp=temp->left;
            }
            else
            {
                temp=temp->right;
            }
        }
        return temp;
    }
 
    Node* maximumnode(Node* cur)
    {
        if(cur==NULL)
        {
            cout << "Invalid!" << endl;
            return cur;
        }
        Node *temp=cur;
        while(temp->right!=NULL)
        {
            temp=temp->right;
        }
        cout<<"Maximum node: "<<temp->val<<endl;
        return temp;
    }
 
    Node* minimumnode(Node* cur)
    {
        if(cur==NULL)
        {
            cout << "Invalid!" << endl;
            return cur;
        }
        Node *temp=cur;
        while(temp->left!=NULL)
        {
            temp=temp->left;
        }
        cout<<"Minimum node: "<<temp->val<<endl;
        return temp;
    }
 
    void inorder(Node *temp)
    {
        if(temp==NULL)
        {
            return;
        }
        inorder(temp->left);
        cout<<temp->val<<" ";
        inorder(temp->right);
    }
 
    Node* getroot(){
        return root;
    }
 
    void deletenode(int val)
    {
        Node* found=searchdata(val);
        if(found==NULL)
        {
            cout<<"Not found"<<endl;
        }
        else if(found->left==NULL && found->right==NULL)
        {
            deletecase1(found);
        }
        else if(found->left==NULL || found->right==NULL)
        {
            deletecase2(found);
        }
        else{
            deletecase3(found);
        }
    }
 
    void deletecase1(Node *temp)
    {
        cout<<"Case 1:"<<endl;
        Node *par=temp->parent;
        if(temp->val < par->val)
        {
            par->left=NULL;
        }
        else{
            par->right=NULL;
        }
        delete temp;
    }
 
    void deletecase2(Node *temp)
    {
        cout<<"Case 2:"<<endl;
        Node *par=temp->parent;
        Node *child=temp->left;
        if(child==NULL)
        {
            child=temp->right;
        }
        if(temp->val < par->val)
        {
            par->left=child;
        }
        else{
            par->right=child;
        }
        child->parent=par;
        delete temp;
    }
 
    void deletecase3(Node *temp)
    {
        Node *suc=findsuccessor(temp);
        int temp1 = suc->val;
        deletenode(suc->val);
        temp->val = temp1;
    }
 
    Node* findsuccessor(Node *temp)
    {
        if(temp==NULL)
        {
            cout<<"Not found"<<endl;
            return NULL;
        }
        else if(temp->right!=NULL)
        {
            Node *cur=temp->right;
            cur=minimumnode(cur);
            cout<<"Successor: "<<cur->val<<endl;
            return cur;
        }
        else if(temp->parent!=NULL){
            Node *cur=temp->parent;
            while(cur->val < temp->val)
            {
                temp=cur;
                cur=cur->parent;
                if(cur==NULL){
                    cout<<"Not found"<<endl;
                    return NULL;
                }
            }
            cout<<"Successor: "<<cur->val<< endl;
            return cur;
        }
        else{
            cout<<"Not found"<<endl;
            return NULL;
        }
    }
 
    Node* findpredeccessor(Node *temp)
    {
        if(temp==NULL)
        {
            cout<<"Not found in the list"<<endl;
            return NULL;
        }
        else if(temp->left!=NULL)
        {
            Node *cur=temp->left;
            cur=maximumnode(cur);
            cout<<"Predecessor: "<<cur->val<<endl;
            return cur;
        }
        else if(temp->parent!=NULL){
            Node *cur=temp->parent;
            while(cur->val > temp->val)
            {
                temp=cur;
                cur=cur->parent;
                if(cur==NULL){
                    cout<<"Not found"<<endl;
                    return NULL;
                }
            }
            cout<<"Predecessor: "<<cur->val<< endl;
            return cur;
        }
        else{
            cout<<"Not found"<<endl;
            return NULL;
        }
    }
};
 
int main()
{
    //freopen("input.txt","r",stdin);
    int n;
    cin>>n;
    binarysearchtree bst;
    for(int i=0;i<n;i++)
    {
        int a;
        cin>>a;
        bst.insertdata(a);
    }
    Node *temp=bst.getroot();
    bst.inorder(temp);
    cout << endl;
    int i;
    cin>>i;
    Node* found=bst.searchdata(i);
    if(found==NULL)
    {
        cout<<"Not found"<<endl;
    }
    else{
        cout<<"found"<<endl;
    }
    bst.minimumnode(bst.getroot());
    bst.maximumnode(bst.getroot());
    Node *temp1=bst.getroot();
    bst.inorder(temp1);
    cout << endl;
    int del;
    cout<<"Want to del:"<<endl;
    cin>>del;
    bst.deletenode(del);
    Node *temp2=bst.getroot();
    bst.inorder(temp2);
    cout << endl;
 
    int p;
    cout<<"Find the successor: "<<endl;
    cin>>p;
 
    Node* found2=bst.searchdata(p);
    if(found2==NULL)
    {
        cout<<"Not found"<<endl;
    }
    else{
        cout<<"found"<<endl;
    }
 
    cout<<"Find the successor: "<<endl;
    bst.findsuccessor(found2);
 
 
    int q;
    cout<<"Find the predecessor: "<<endl;
    cin>>q;
 
    Node* found3=bst.searchdata(q);
    if(found3==NULL)
    {
        cout<<"Not found"<<endl;
    }
    else{
        cout<<"found"<<endl;
    }
 
    cout<<"Find the successor: "<<endl;
    bst.findpredeccessor(found3);
    //bst.inorder(temp2);
 
 
   // bst.deletecase1();
}
 
/*
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82
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*/
 

#include<iostream>
using namespace std;
class Node{
    public:
    int val;
    Node *parent;
    Node *left;
    Node *right;
};

class binarysearchtree
{
    Node *root;

public:

    binarysearchtree(){
        root =NULL;
    }

    void insertdata(int val)
    {
        Node *newnode=new Node;
        newnode->val=val;
        newnode->parent=NULL;
        newnode->left=NULL;
        newnode->right=NULL;

        if(root==NULL)
        {
            root=newnode;
        }
        else{
            Node *temp=root;
            Node *prev=NULL;
            while(temp!=NULL)
            {
                prev=temp;
                if(val < temp->val)
                {
                    temp=temp->left;
                }
                else{
                    temp=temp->right;
                }
            }
            temp=newnode;
            newnode->parent=prev;
            if(val < prev->val)
            {
                prev->left=newnode;
            }
            else{
                prev->right=newnode;
            }
           // cout<<prev->val<<" "<<newnode->val<<endl;
        }
    }

    Node* searchdata(int val)
    {
        Node *temp=root;
        while(temp!=NULL)
        {
            if(temp->val==val) return temp;
            if(val<temp->val)
            {
                temp=temp->left;
            }
            else
            {
                temp=temp->right;
            }
        }
        return temp;
    }

    Node* maximumnode(Node* cur)
    {
        if(cur==NULL)
        {
            cout << "Invalid!" << endl;
            return cur;
        }
        Node *temp=cur;
        while(temp->right!=NULL)
        {
            temp=temp->right;
        }
        cout<<"Maximum node: "<<temp->val<<endl;
        return temp;
    }

    Node* minimumnode(Node* cur)
    {
        if(cur==NULL)
        {
            cout << "Invalid!" << endl;
            return cur;
        }
        Node *temp=cur;
        while(temp->left!=NULL)
        {
            temp=temp->left;
        }
        cout<<"Minimum node: "<<temp->val<<endl;
        return temp;
    }

    void inorder(Node *temp)
    {
        if(temp==NULL)
        {
            return;
        }
        inorder(temp->left);
        cout<<temp->val<<" ";
        inorder(temp->right);
    }

    Node* getroot(){
        return root;
    }

    void deletenode(int val)
    {
        Node* found=searchdata(val);
        if(found==NULL)
        {
            cout<<"Not found"<<endl;
        }
        else if(found->left==NULL && found->right==NULL)
        {
            deletecase1(found);
        }
        else if(found->left==NULL || found->right==NULL)
        {
            deletecase2(found);
        }
        else{
            deletecase3(found);
        }
    }

    void deletecase1(Node *temp)
    {
        cout<<"Case 1:"<<endl;
        Node *par=temp->parent;
        if(temp->val < par->val)
        {
            par->left=NULL;
        }
        else{
            par->right=NULL;
        }
        delete temp;
    }

    void deletecase2(Node *temp)
    {
        cout<<"Case 2:"<<endl;
        Node *par=temp->parent;
        Node *child=temp->left;
        if(child==NULL)
        {
            child=temp->right;
        }
        if(temp->val < par->val)
        {
            par->left=child;
        }
        else{
            par->right=child;
        }
        child->parent=par;
        delete temp;
    }

    void deletecase3(Node *temp)
    {
        Node *suc=findsuccessor(temp);
        int temp1 = suc->val;
        deletenode(suc->val);
        temp->val = temp1;
    }

    Node* findsuccessor(Node *temp)
    {
        if(temp==NULL)
        {
            cout<<"Not found"<<endl;
            return NULL;
        }
        else if(temp->right!=NULL)
        {
            Node *cur=temp->right;
            cur=minimumnode(cur);
            cout<<"Successor: "<<cur->val<<endl;
            return cur;
        }
        else if(temp->parent!=NULL){
            Node *cur=temp->parent;
            while(cur->val < temp->val)
            {
                temp=cur;
                cur=cur->parent;
                if(cur==NULL){
                    cout<<"Not found"<<endl;
                    return NULL;
                }
            }
            cout<<"Successor: "<<cur->val<< endl;
            return cur;
        }
        else{
            cout<<"Not found"<<endl;
            return NULL;
        }
    }

    Node* findpredeccessor(Node *temp)
    {
        if(temp==NULL)
        {
            cout<<"Not found in the list"<<endl;
            return NULL;
        }
        else if(temp->left!=NULL)
        {
            Node *cur=temp->left;
            cur=maximumnode(cur);
            cout<<"Predecessor: "<<cur->val<<endl;
            return cur;
        }
        else if(temp->parent!=NULL){
            Node *cur=temp->parent;
            while(cur->val > temp->val)
            {
                temp=cur;
                cur=cur->parent;
                if(cur==NULL){
                    cout<<"Not found"<<endl;
                    return NULL;
                }
            }
            cout<<"Predecessor: "<<cur->val<< endl;
            return cur;
        }
        else{
            cout<<"Not found"<<endl;
            return NULL;
        }
    }
};

int main()
{
    //freopen("input.txt","r",stdin);
    int n;
    cin>>n;
    binarysearchtree bst;
    for(int i=0;i<n;i++)
    {
        int a;
        cin>>a;
        bst.insertdata(a);
    }
    Node *temp=bst.getroot();
    bst.inorder(temp);
    cout << endl;
    int i;
    cin>>i;
    Node* found=bst.searchdata(i);
    if(found==NULL)
    {
        cout<<"Not found"<<endl;
    }
    else{
        cout<<"found"<<endl;
    }
    bst.minimumnode(bst.getroot());
    bst.maximumnode(bst.getroot());
    Node *temp1=bst.getroot();
    bst.inorder(temp1);
    cout << endl;
    int del;
    cout<<"Want to del:"<<endl;
    cin>>del;
    bst.deletenode(del);
    Node *temp2=bst.getroot();
    bst.inorder(temp2);
    cout << endl;

    int p;
    cout<<"Find the successor: "<<endl;
    cin>>p;

    Node* found2=bst.searchdata(p);
    if(found2==NULL)
    {
        cout<<"Not found"<<endl;
    }
    else{
        cout<<"found"<<endl;
    }

    cout<<"Find the successor: "<<endl;
    bst.findsuccessor(found2);


    int q;
    cout<<"Find the predecessor: "<<endl;
    cin>>q;

    Node* found3=bst.searchdata(q);
    if(found3==NULL)
    {
        cout<<"Not found"<<endl;
    }
    else{
        cout<<"found"<<endl;
    }

    cout<<"Find the successor: "<<endl;
    bst.findpredeccessor(found3);
    //bst.inorder(temp2);


   // bst.deletecase1();
}

/*
12
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82
44
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54
*/
