# How do you delete a node from a binary search tree?

## How do you delete a node from a binary search tree?

Delete function is used to delete the specified node from a binary search tree….Function:

1. void deletion(Node*& root, int item)
2. {
3. Node* parent = NULL;
4. Node* cur = root;
5. search(cur, item, parent);
6. if (cur == NULL)
7. return;
8. if (cur->left == NULL && cur->right == NULL)

## How is a binary search tree constructed?

Construct a Binary Search Tree

• Set the current node to be the root node of the tree.
• If the target value equals the key value for the current node, then the target value is found.
• If the target value is less than the key value for a node, make the current node the left child.

How do you add and remove an element from a binary search tree?

Method-01:

1. Visit to the right subtree of the deleting node.
2. Pluck the least value element called as inorder successor.
3. Replace the deleting element with its inorder successor.

### How do I remove a root node from AVL tree?

Solution: in this case, node B has balance factor -1. Deleting the node 60, disturbs the balance factor of the node 50 therefore, it needs to be R-1 rotated. The node C i.e. 45 becomes the root of the tree with the node B(40) and A(50) as its left and right child.

### What are the rules to construct expression tree?

How to construct an expression tree?

• If we get an operand in the given expression, then push it in the stack.
• If an operator gets two values in the expression, then add in the expression tree as its child, and push them in the current node.
• Repeat Step-1 and Step-2 until we do not complete over the given expression.

What is a binary search tree How can you insert and delete an element in a BST explain using suitable examples?

Basic operations on a BST

1. Create: creates an empty tree.
2. Insert: insert a node in the tree.
3. Search: Searches for a node in the tree.
4. Delete: deletes a node from the tree.
5. Inorder: in-order traversal of the tree.
6. Preorder: pre-order traversal of the tree.
7. Postorder: post-order traversal of the tree.

#### How do insertions and deletions differ in a BST?

Insertion: For inserting element as left child of 2, we have to traverse all elements. Therefore, insertion in binary tree has worst case complexity of O(n). Deletion: For deletion of element 2, we have to traverse all elements to find 2 (assuming we do breadth first traversal).

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