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Create an in-order threaded binary search tree and perform the traversals.(Double Thread)

 CODE:


#include <iostream>


using namespace std;


struct Node {

    int data;

    Node* left;

    Node* right;

    bool leftThread;

    bool rightThread;

};


Node* createThreadedBST(int arr[], int n) {

    Node* root = nullptr;


    for (int i = 0; i < n; ++i) {

        Node* newNode = new Node;

        newNode->data = arr[i];

        newNode->left = newNode->right = nullptr;

        newNode->leftThread = newNode->rightThread = true;


        if (root == nullptr) {

            root = newNode;

        } else {

            Node* current = root;

            Node* parent = nullptr;


            while (true) {

                parent = current;


                if (newNode->data < current->data) {

                    if (!current->leftThread) {

                        current = current->left;

                    } else {

                        newNode->left = current->left;

                        newNode->right = current;

                        current->leftThread = false;

                        current->left = newNode;

                        break;

                    }

                } else {

                    if (!current->rightThread) {

                        current = current->right;

                    } else {

                        newNode->left = current;

                        newNode->right = current->right;

                        current->rightThread = false;

                        current->right = newNode;

                        break;

                    }

                }

            }

        }

    }


    return root;

}


void inOrderTraversal(Node* root) {

    Node* current = root;


    while (current != nullptr) {

        while (!current->leftThread) {

            current = current->left;

        }


        cout << current->data << " ";


        while (current->rightThread && current->right != nullptr) {

            current = current->right;

            cout << current->data << " ";

        }


        current = current->right;

    }

}


int main() {

    int arr[] = {6, 3, 8, 1, 5, 7, 9};

    int n = sizeof(arr) / sizeof(arr[0]);


    Node* root = createThreadedBST(arr, n);


    cout << "In-order traversal of the threaded BST: ";

    inOrderTraversal(root);

    cout << endl;


    return 0;

}







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