# Can a binary tree be doubly linked list?

## Can a binary tree be doubly linked list?

The binary tree is a tree data structure in which each node has at most two children node. This can be achieved by traversing the tree in the in-order manner that is, left the child -> root ->right node. Traverse left sub-tree and convert it into the doubly linked list by adding nodes to the end of the list.

### Can we use binary search tree in linked list?

Yes, Binary search is possible on the linked list if the list is ordered and you know the count of elements in list. But While sorting the list, you can access a single element at a time through a pointer to that node i.e. either a previous node or next node.

**What does a binary tree not have in common with a doubly linked list?**

A linked list is a sequence of element where each element is linked to the next one, and in the case of a doubly linked list, the previous one. A binary search tree is something totally different. It has a root node, the root node has up to two child nodes, and each child node can have up to two child notes etc etc.

**Is binary tree symmetric?**

A binary tree is a mirror image of itself if its left and right subtrees are identical mirror images i.e., the binary tree is symmetrical.

## How do you turn a tree into a list?

Converting trees to lists

- Definition (Preorder traversal) First visit the root, then traverse the left and right subtrees in preorder.
- Definition (Inorder traversal)
- Definition (Postorder traversal)
- Exercise.

### How do you convert a binary tree to an array?

Step 1 − store data in order traversal of a binary tree into array arr[]. Step 2 − sort the array arr[] using any sorting technique. Step 3 − Now, do the inorder traversal of the tree and e copy the elements of an array to the nodes of the tree one by one.

**Why is binary search not suitable for linked list?**

A linked list only allows sequential access, so binary search is impossible even if the list is sorted.

**Why is binary search tree better than linked list?**

A binary search tree can be implemented in any fashion, it doesn’t need to use a linked list. A linked list is simply a structure which contains nodes and pointers/references to other nodes inside a node. Given the head node of a list, you may browse to any other node in a linked list.

## Can you traverse tree without recursion?

Using Stack is the obvious way to traverse tree without recursion. Below is an algorithm for traversing binary tree using stack.

### How do you iterate through BST without recursion?

in-order:

- Create an empty stack S.
- Initialize current node as root.
- Push the current node to S and set current = current->left until current is NULL.
- If current is NULL and stack is not empty then. -> Pop the top item from stack.
- If current is NULL and stack is empty then we are done.

**Why does binary search not work on linked lists?**

The main problem that binary search takes O(n) time in Linked List due to fact that in linked list we are not able to do indexing which led traversing of each element in Linked list take O(n) time. In this paper a method is implemented through which binary search can be done with time complexity of O(log2n).

**Is Mirror Image binary tree?**

## How can you tell if two binary trees are mirror images?

For two trees ‘a’ and ‘b’ to be mirror images, the following three conditions must be true:

- Their root node’s key must be same.
- Left subtree of root of ‘a’ and right subtree root of ‘b’ are mirror.
- Right subtree of ‘a’ and left subtree of ‘b’ are mirror.

### How do you flatten a tree in data structure?

A “flattening” of a tree is merely a list resulting from a traversal; your data structure is no longer nested, but flat instead. To flatten a tree, begin with an empty linked list. Then traverse the tree in the order of your choosing, appending each visited node to the linked list.

**Can a binary search tree be implemented with an array?**

Given an array that represents a tree in such a way that array indexes are values in tree nodes and array values give the parent node of that particular index (or node). The value of the root node index would always be -1 as there is no parent for root.

**Can you implement a binary tree using arrays or Linkedlist?**

Binary Tree with Array implementation in C++ These child nodes are known as right child and left child. For representing trees, there are two ways, dynamic node representation which uses linked list. Sequential representation which uses array.

## What is the disadvantage of a binary search?

Binary Search Algorithm Disadvantages- It employs recursive approach which requires more stack space. Programming binary search algorithm is error prone and difficult. The interaction of binary search with memory hierarchy i.e. caching is poor.