Create InsertionAndDeletationInBST.cpp

Here Insertion and deletion of a Node in Binary search tree is given

InsertionAndDeletationInBST.cpp

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+#include <iostream>
+using namespace std;
+
+struct Node {
+    int data;
+    Node* left;
+    Node* right;
+    Node(int val) : data(val), left(NULL), right(NULL) {}
+};
+
+// Helper function to find the minimum value node in a subtree
+Node* findMin(Node* root) {
+    while (root->left != NULL) root = root->left;
+    return root;
+}
+
+Node* deleteValue(Node* root, int key) {
+    // Base case: if the tree is empty
+    if (root == NULL) return root;
+
+    // Recursive case: traverse the tree to find the node to delete
+    if (key < root->data) {
+        root->left = deleteValue(root->left, key);
+    } else if (key > root->data) {
+        root->right = deleteValue(root->right, key);
+    } else {
+        // Node with only one child or no child
+        if (root->left == NULL) {
+            Node* temp = root->right;
+            delete root;
+            return temp;
+        } else if (root->right == NULL) {
+            Node* temp = root->left;
+            delete root;
+            return temp;
+        }
+
+        // Node with two children: get the inorder successor (smallest in the right subtree)
+        Node* temp = findMin(root->right);
+
+        // Copy the inorder successor's content to this node
+        root->data = temp->data;
+
+        // Delete the inorder successor
+        root->right = deleteValue(root->right, temp->data);
+    }
+
+    return root;
+}
+
+// Helper function to perform inorder traversal
+void inorder(Node* root) {
+    if (root == NULL) return;
+    inorder(root->left);
+    cout << root->data << " ";
+    inorder(root->right);
+}
+
+int main() {
+    Node* root = new Node(50);
+    root->left = new Node(30);
+    root->right = new Node(70);
+    root->left->left = new Node(20);
+    root->left->right = new Node(40);
+    root->right->left = new Node(60);
+    root->right->right = new Node(80);
+
+    cout << "Inorder traversal of the given tree: ";
+    inorder(root);
+    cout << endl;
+
+    cout << "\nDelete 20\n";
+    root = deleteValue(root, 20);
+    cout << "Inorder traversal of the modified tree: ";
+    inorder(root);
+    cout << endl;
+
+    cout << "\nDelete 30\n";
+    root = deleteValue(root, 30);
+    cout << "Inorder traversal of the modified tree: ";
+    inorder(root);
+    cout << endl;
+
+    cout << "\nDelete 50\n";
+    root = deleteValue(root, 50);
+    cout << "Inorder traversal of the modified tree: ";
+    inorder(root);
+    cout << endl;
+
+    return 0;
+}