/* 
** Binary Search Tree implementation in C++
** Harish R
*/
#include<iostream>
int n = 0 ;
using namespace std;

class BST {
    public :
    struct node {
        int data;
        node* left;
        node* right;
    };

    node* root;

    node* makeEmpty(node* t) {
        if(t == NULL)
            return NULL;
        {
            makeEmpty(t->left);
            makeEmpty(t->right);
            delete t;
        }
        return NULL;
    }

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

    node* findMin(node* t)
    {
        if(t == NULL)
            return NULL;
        else if(t->left == NULL)
            return t;
        else
            return findMin(t->left);
    }

    node* findMax(node* t) {
        if(t == NULL)
            return NULL;
        else if(t->right == NULL)
            return t;
        else
            return findMax(t->right);
    }

    node* remove(int x, node* t) {
        node* temp;
        if(t == NULL)
            return NULL;
        else if(x < t->data)
            t->left = remove(x, t->left);
        else if(x > t->data)
            t->right = remove(x, t->right);
        else if(t->left && t->right)
        {
            temp = findMin(t->right);
            t->data = temp->data;
            t->right = remove(t->data, t->right);
        }
        else
        {
            temp = t;
            if(t->left == NULL)
                t = t->right;
            else if(t->right == NULL)
                t = t->left;
            delete temp;
        }

        return t;
    }

    void inorder(node* t) {
        if(t == NULL)
            return;
        inorder(t->left);
        cout << t->data << " ";
        inorder(t->right);
    }

    node* find(node* t, int x) {
        if(t == NULL)
            return NULL;
        else if(x < t->data)
            return find(t->left, x);
        else if(x > t->data)
            return find(t->right, x);
        else
            return t;
    }

public:
    BST() {
        root = NULL;
    }

    ~BST() {
        root = makeEmpty(root);
    }

    void insert(int x) {
        root = insert(x, root);
    }

    void remove(int x) {
        root = remove(x, root);
    }

    void display() {
        inorder(root);
        cout << endl;
    }

    void search(int x) {
        root = find(root, x);
    }
    int getcount (node * root)
{
  if (root == NULL)
  return 0 ;
  if (root ->left != NULL)
  {cout<<root-> left -> data <<" " ;;
    n=n+1;
    n= getcount(root -> left);
  }
  if (root -> right !=NULL)
  {
    cout<<root->right->data <<" ";
    n=n+1 ; 
    n= getcount(root -> right);
  }
  return n ;
}
};


int main() {
    BST t;
    t.insert(20);
    t.insert(25);
    t.insert(15);
    t.insert(10);
    t.insert(30);
    t.insert(50);
    t.insert(39);
    t.insert(78);


    t.display();
    cout<<t.getcount(t.root);
    return 0; 
}