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bst using c++

Thoughtful Trout answered on November 24, 2022 Popularity 10/10 Helpfulness 2/10

answer bst using c++

related bst with cpp

bst using c++

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// by mohanad moumen
#include <iostream>

// Defining a class Node to represent a node in a binary search tree
class Node{
public:
    int data;
    Node *left,*right;

    Node(int value){
        data = value;
        left = right = NULL;
    }
};

// Defining a class BST to represent a binary search tree
class BST{
public:
    Node* root;
    
    // Constructor to initialize an empty binary search tree
    BST(){
        root=NULL;
    }
    
    // Function to insert a node with value v into the binary search tree rooted at r
    Node* insert(Node* r,int v){
        if(r == NULL){
            // If the root is NULL, create a new node with value v and make it the root
            Node* newNode = new Node(v);
            r = newNode;
        }
        
        else if(v < r->data)
            // If v is less than the data in the current node, recursively insert v in the left subtree
            r->left = insert(r->left, v);
        else
            // If v is greater than or equal to the data in the current node, recursively insert v in the right subtree
            r->right = insert(r->right, v);
        
        return r;
    }
    
    // Function to insert a node with value v into the binary search tree
    void insert(int v){
        // Call the insert function with the root of the tree and value v
        root = insert(root, v);
    }
    
    // Function to traverse the binary search tree in pre-order (NLR) and print the nodes
    void preOrder(Node *r){
        if(r==NULL)
            return;
            
        // Print the data in the current node
        std::cout<< r->data <<"\t";
        
        // Recursively traverse the left subtree
        preOrder(r->left);
        
        // Recursively traverse the right subtree
        preOrder(r->right);
    }  
    
    // Function to traverse the binary search tree in in-order (LNR) and print the nodes
    void inOrder(Node *r){
        if(r==NULL)
            return;
            
        // Recursively traverse the left subtree
        inOrder(r->left);
        
        // Print the data in the current node
        std::cout<<r->data<<"\t";
        
        // Recursively traverse the right subtree
        inOrder(r->right);
    }   
    
    // Function to traverse the binary search tree in post-order (LRN) and print the nodes
    void postOrder(Node *r){
        if(r==NULL)
            return;
            
        // Recursively traverse the left subtree
        postOrder(r->left);
        
        // Recursively traverse the right subtree
        postOrder(r->right);
        
        // Print the data in the current node
        std::cout<<r->data<<"\t";
    }  
};

int main() {
    // Create an instance of the BST class
    BST tree;
    
    // Insert nodes with values into the binary search tree
    tree.insert(45);
    tree.insert(15);
    tree.insert(79);
    tree.insert(90);
    tree.insert(10);
    tree.insert(55);
    tree.insert(12);
    tree.insert(20);
    tree.insert(50);

    // Print the nodes in the binary search tree in pre-order (NLR)
    std::cout<<"\npre-order!! \n";
    tree.preOrder(tree.root);
    
    // Print the nodes in the binary search tree in in-order (LNR)
    std::cout<<"\n\nin-order!! \n";
    tree.inOrder(tree.root);
    
    // Print the nodes in the binary search tree in post-order (LRN)
    std::cout<<"\n\npost-order!! \n";
    tree.postOrder(tree.root);
    
    return 0;
}

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: Grepper

Tags: binary-search-tree c++ inorder insert postorder preorder using

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Contributed on Dec 09 2023

Thoughtful Trout

0 Answers Avg Quality 2/10

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bst with cpp

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// Binary Search Tree operations in C++

#include <iostream>
using namespace std;

struct node {
  int key;
  struct node *left, *right;
};

// Create a node
struct node *newNode(int item) {
  struct node *temp = (struct node *)malloc(sizeof(struct node));
  temp->key = item;
  temp->left = temp->right = NULL;
  return temp;
}

// Inorder Traversal
void inorder(struct node *root) {
  if (root != NULL) {
    // Traverse left
    inorder(root->left);

    // Traverse root
    cout << root->key << " -> ";

    // Traverse right
    inorder(root->right);
  }
}

// Insert a node
struct node *insert(struct node *node, int key) {
  // Return a new node if the tree is empty
  if (node == NULL) return newNode(key);

  // Traverse to the right place and insert the node
  if (key < node->key)
    node->left = insert(node->left, key);
  else
    node->right = insert(node->right, key);

  return node;
}

// Find the inorder successor
struct node *minValueNode(struct node *node) {
  struct node *current = node;

  // Find the leftmost leaf
  while (current && current->left != NULL)
    current = current->left;

  return current;
}

// Deleting a node
struct node *deleteNode(struct node *root, int key) {
  // Return if the tree is empty
  if (root == NULL) return root;

  // Find the node to be deleted
  if (key < root->key)
    root->left = deleteNode(root->left, key);
  else if (key > root->key)
    root->right = deleteNode(root->right, key);
  else {
    // If the node is with only one child or no child
    if (root->left == NULL) {
      struct node *temp = root->right;
      free(root);
      return temp;
    } else if (root->right == NULL) {
      struct node *temp = root->left;
      free(root);
      return temp;
    }

    // If the node has two children
    struct node *temp = minValueNode(root->right);

    // Place the inorder successor in position of the node to be deleted
    root->key = temp->key;

    // Delete the inorder successor
    root->right = deleteNode(root->right, temp->key);
  }
  return root;
}

// Driver code
int main() {
  struct node *root = NULL;
  root = insert(root, 8);
  root = insert(root, 3);
  root = insert(root, 1);
  root = insert(root, 6);
  root = insert(root, 7);
  root = insert(root, 10);
  root = insert(root, 14);
  root = insert(root, 4);

  cout << "Inorder traversal: ";
  inorder(root);

  cout << "\nAfter deleting 10\n";
  root = deleteNode(root, 10);
  cout << "Inorder traversal: ";
  inorder(root);
}

Popularity 8/10 Helpfulness 4/10 Language cpp

Source: www.programiz.com

Tags: c++

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Contributed on Nov 24 2022

Sajid

0 Answers Avg Quality 2/10

bst using c++

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