# Can we insert duplicate values in binary search tree?

## Can we insert duplicate values in binary search tree?

In a Binary Search Tree (BST), all keys in left subtree of a key must be smaller and all keys in right subtree must be greater. So a Binary Search Tree by definition has distinct keys and duplicates in binary search tree are not allowed.

## How does binary search handle duplicates?

How to handle duplicates in Binary Search Tree?

- 1) Height of tree is small irrespective of number of duplicates.
- 2) Search, Insert and Delete become easier to do.
- 3) This approach is suited for self-balancing BSTs (AVL Tree, Red-Black Tree, etc) also.

**How do you delete duplicates in binary tree?**

Remove duplicate algorithm for a Binary Search Tree:

- Start a tree walk (in/pre/post order)
- At each node, do a binary search on the subtree rooted at that node for the key value stored in the node. If the key value is found down the tree, call delete(key) and restart step 2 (Might have multiple duplicates).

### How do you copy a binary search tree?

Algorithm to create a duplicate binary tree

- If root is equal to NULL, then return NULL.
- Create a new node and copy data of root node into new node.
- Recursively, create clone of left sub tree and make it left sub tree of new node.
- Recursively, create clone of right sub tree and make it right sub tree of new node.

### What happens if you insert an item that is already present in the binary tree?

Inserting into a binary search tree The null tree is replaced by a leaf. If the value to be inserted is already in the tree, nothing is done.

**Does Red Black tree allow duplicates?**

For simplicity, the implementation does not allow duplicate values to be inserted in the tree. Also, we implement only insertion and searching because the algorithm to delete a node is more complicated.

#### Is binary search tree unique?

A binary search tree is a binary tree with the following properties: The data stored at each node has a distinguished key which is unique in the tree and belongs to a total order.

#### Can a TreeMap contain duplicate keys?

A TreeMap cannot contain duplicate keys. TreeMap cannot contain the null key. However, It can have null values.

**Can a HashTable have duplicate keys?**

Hashtable Features It does not accept duplicate keys. It stores key-value pairs in hash table data structure which internally maintains an array of list.

## What is a valid binary search tree?

“Validating” a binary search tree means that you check that it does indeed have all smaller items on the left and large items on the right. Essentially, it’s a check to see if a binary tree is a binary search tree.

## Why do we use binary search tree?

The main reason to use a binary search tree is the fact that it extends the capability of a normal array. An array is a data type that stores data points contiguously in sequence.

**Is B tree a binary search tree?**

In computer science, a B-tree is a self-balancing tree data structure that maintains sorted data and allows searches, sequential access, insertions, and deletions in logarithmic time. The B-tree generalizes the binary search tree, allowing for nodes with more than two children. Unlike other self-balancing binary search trees, the B-tree is well suited for storage systems that read and write relatively large blocks of data, such as disks. It is commonly used in databases and file systems.

### How is a binary search tree useful?

To sum up, Binary Search Trees are very useful data structures when handling any data type. Firstly they represent hierarchies across the massive data structure. Secondly, they provide an organized way of inserting and searching. Most importantly the relationship between the data that is being stored.