# Data Structures Trees Interview Preparation Guide **Download PDF** Add New Question

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Data Structures Trees frequently Asked Questions by expert members with experience in Data structures trees. These interview questions and answers on Data Structures Trees will help you strengthen your technical skills, prepare for the interviews and quickly revise the concepts. So get preparation for the Data Structures Trees job interview

## 14 Data Structures Trees Questions and Answers:

### 1 :: Explain Trees using C++ with an example?

Tree is a structure that is similar to linked list. A tree will have two nodes that point to the left part of the tree and the right part of the tree. These two nodes must be of the similar type.

The following code snippet describes the declaration of trees. The advantage of trees is that the data is placed in nodes in sorted order.

struct TreeNode

{

int item; // The data in this node.

TreeNode *left; // Pointer to the left subtree.

TreeNode *right; // Pointer to the right subtree.

}

The following code snippet illustrates the display of tree data.

void showTree( TreeNode *root )

{

if ( root != NULL ) { // (Otherwise, there's nothing to print.)

showTree(root->left); // Print items in left sub tree.

cout << root->item << " "; // Print the root item.

showTree(root->right ); // Print items in right sub tree.

}

} // end inorderPrint()

The following code snippet describes the declaration of trees. The advantage of trees is that the data is placed in nodes in sorted order.

struct TreeNode

{

int item; // The data in this node.

TreeNode *left; // Pointer to the left subtree.

TreeNode *right; // Pointer to the right subtree.

}

The following code snippet illustrates the display of tree data.

void showTree( TreeNode *root )

{

if ( root != NULL ) { // (Otherwise, there's nothing to print.)

showTree(root->left); // Print items in left sub tree.

cout << root->item << " "; // Print the root item.

showTree(root->right ); // Print items in right sub tree.

}

} // end inorderPrint()

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### 2 :: What is a B tree?

A B-tree of order m (the maximum number of children for each node) is a tree which satisfies the following properties :

1. Every node has <= m children.

2. Every node (except root and leaves) has >= m/2 children.

3. The root has at least 2 children.

4. All leaves appear in the same level, and carry no information.

5. A non-leaf node with k children contains k – 1 keys

1. Every node has <= m children.

2. Every node (except root and leaves) has >= m/2 children.

3. The root has at least 2 children.

4. All leaves appear in the same level, and carry no information.

5. A non-leaf node with k children contains k – 1 keys

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### 3 :: What is splay trees?

A splay tree is a self-balancing binary search tree. In this, recently accessed elements are quick to access again

It is useful for implementing caches and garbage collection algorithms.

When we move left going down this path, its called a zig and when we move right, its a zag.

Following are the splaying steps. There are six different splaying steps.

1. Zig Rotation (Right Rotation)

2. Zag Rotation (Left Rotation)

3. Zig-Zag (Zig followed by Zag)

4. Zag-Zig (Zag followed by Zig)

5. Zig-Zig

6. Zag-Zag

It is useful for implementing caches and garbage collection algorithms.

When we move left going down this path, its called a zig and when we move right, its a zag.

Following are the splaying steps. There are six different splaying steps.

1. Zig Rotation (Right Rotation)

2. Zag Rotation (Left Rotation)

3. Zig-Zag (Zig followed by Zag)

4. Zag-Zig (Zag followed by Zig)

5. Zig-Zig

6. Zag-Zag

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### 4 :: Explain red-black trees?

A red-black tree is a type of self-balancing binary search tree.

In red-black trees, the leaf nodes are not relevant and do not contain data.

Red-black trees, like all binary search trees, allow efficient in-order traversal of elements.

Each node has a color attribute, the value of which is either red or black.

Characteristics:

The root and leaves are black

Both children of every red node are black.

Every simple path from a node to a descendant leaf contains the same number of black nodes, either counting or not counting the null black nodes

In red-black trees, the leaf nodes are not relevant and do not contain data.

Red-black trees, like all binary search trees, allow efficient in-order traversal of elements.

Each node has a color attribute, the value of which is either red or black.

Characteristics:

The root and leaves are black

Both children of every red node are black.

Every simple path from a node to a descendant leaf contains the same number of black nodes, either counting or not counting the null black nodes

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### 5 :: What is threaded binary trees?

In a threaded binary tree, if a node 'A' has a right child 'B' then B's left pointer must be either a child, or a thread back to A.

In the case of a left child, that left child must also have a left child or a thread back to A, and so we can follow B's left children until we find a thread, pointing back to A.

This data structure is useful when stack memory is less and using this tree the treversal around the tree becomes faster.

In the case of a left child, that left child must also have a left child or a thread back to A, and so we can follow B's left children until we find a thread, pointing back to A.

This data structure is useful when stack memory is less and using this tree the treversal around the tree becomes faster.

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### 6 :: Explain a B+ tree?

It is a dynamic, multilevel index, with maximum and minimum bounds on the number of keys in each index segment. all records are stored at the lowest level of the tree; only keys are stored in interior blocks.

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### 7 :: Explain ree database. Explain its common uses?

A tree is a data structure which resembles a hierarchical tree structure. Every element in the structure is a node. Every node is linked with the next node, either to its left or to its right. Each node has zero or more child nodes. The length of the longest downward path to a leaf from that node is known as the height of the node and the length of the path to its root is known as the depth of a node.

Common Uses:

- To manipulate hierarchical data

- Makes the information search, called tree traversal, easier.

- To manipulate data that is in the form of sorted list.

- To give visual effects for digital images using as a work flow by compositing them.

Common Uses:

- To manipulate hierarchical data

- Makes the information search, called tree traversal, easier.

- To manipulate data that is in the form of sorted list.

- To give visual effects for digital images using as a work flow by compositing them.

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### 8 :: Explain binary tree? Explain its uses?

A binary tree is a tree structure, in which each node has only two child nodes. The first node is known as root node. The parent has two nodes namely left child and right child.

Uses of binary tree:

- To create sorting routine.

- Persisting data items for the purpose of fast lookup later.

- For inserting a new item faster

Uses of binary tree:

- To create sorting routine.

- Persisting data items for the purpose of fast lookup later.

- For inserting a new item faster

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### 9 :: How to find the depth of a binary tree?

The depth of a binary tree is found using the following process:

1. Send the root node of a binary tree to a function

2. If the tree node is null, then return false value.

3. Calculate the depth of the left tree; call it ‘d1’ by traversing every node. Increment the counter by 1, as the traversing progresses until it reaches the leaf node. These operations are done recursively.

4. Repeat the 3rd step for the left node. Name the counter variable ‘d2’.

5. Find the maximum value between d1 and d2. Add 1 to the max value. Let us call it ‘depth’.

6. The variable ‘depth’ is the depth of the binary tree.

1. Send the root node of a binary tree to a function

2. If the tree node is null, then return false value.

3. Calculate the depth of the left tree; call it ‘d1’ by traversing every node. Increment the counter by 1, as the traversing progresses until it reaches the leaf node. These operations are done recursively.

4. Repeat the 3rd step for the left node. Name the counter variable ‘d2’.

5. Find the maximum value between d1 and d2. Add 1 to the max value. Let us call it ‘depth’.

6. The variable ‘depth’ is the depth of the binary tree.

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### 10 :: What is pre-order and in-order tree traversal?

A non-empty binary tree is traversed in 3 types, namely pre-order, in-order and post-order in a recursive fashion.

Pre-order:

Pre-order process is as follows:

- Visit the root node

- Traverse the left sub tree

- Traverse the right sub tree

In-Order:

In order process is as follows:

- Traverse the left sub tree

- Visit the root node

- Traverse the right sub tree

Pre-order:

Pre-order process is as follows:

- Visit the root node

- Traverse the left sub tree

- Traverse the right sub tree

In-Order:

In order process is as follows:

- Traverse the left sub tree

- Visit the root node

- Traverse the right sub tree

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