Master Arrays and Linked Lists: Enhance Your Data Structures Skills

Question 1

Which operation on an array has a time complexity of O(1)?

Accepted Answer

Searching for an element by its index

Answer

Inserting an element at the end

Answer

Deleting an element from the middle

Answer

Sorting the array

Question 2

What is the time complexity of inserting an element at the beginning of a singly linked list?

Accepted Answer

O(1)

Answer

O(n)

Answer

O(log n)

Answer

O(n^2)

Question 3

What is the time complexity of performing a binary search on a sorted array?

Accepted Answer

O(log n)

Answer

O(1)

Answer

O(n)

Answer

O(n^2)

Question 4

In a large dataset, which data structure, array or linked list, typically offers superior performance for searching?

Accepted Answer

Array

Answer

Linked list

Question 5

Which operation on a singly linked list necessitates traversing the list to locate the predecessor of the target element, resulting in an O(n) time complexity?

Accepted Answer

Deleting an element from the middle

Answer

Inserting an element at the start

Answer

Traversing the list

Answer

Searching for an element

Question 6

Which of the following is NOT a characteristic of an array?

Accepted Answer

Dynamic memory expansion

Answer

Fixed size

Answer

Elements of the same type

Answer

Random access

Question 7

What is the average-case time complexity of searching for an element in a singly linked list?

Accepted Answer

O(n)

Answer

O(1)

Answer

O(log n)

Answer

O(n^2)

Question 8

What is the fundamental difference between an array and a linked list?

Accepted Answer

Arrays occupy contiguous memory, while linked lists do not

Answer

Linked lists allow for more efficient insertion and deletion

Answer

Arrays are faster to access than linked lists

Answer

Linked lists can store any type of data, while arrays are limited to primitive types

Question 9

What is the primary advantage of using a doubly linked list over a singly linked list?

Accepted Answer

Constant-time traversal in both directions

Answer

Faster insertions and deletions

Answer

Improved memory efficiency

Answer

Support for random access

Question 10

What is the purpose of a dummy node in a linked list?

Accepted Answer

To simplify insertion and deletion operations at the beginning of the list

Answer

To mark the end of the list

Answer

To improve the efficiency of search operations

Answer

To store additional data associated with the list

Question 11

To efficiently retrieve a student's record from a large, sorted database, which search technique is most suitable?

Accepted Answer

Binary search

Answer

Linear search

Question 12

Which of the following operations on a linked list has a time complexity of O(1)?

Accepted Answer

Inserting a new node at the beginning of a linked list can be performed in constant time.

Answer

Deleting a node from the end of a linked list typically takes O(n) time, where n is the number of nodes in the list.

Answer

Searching for an element in a linked list requires traversing the list, resulting in a time complexity of O(n).

Answer

Inserting a new node in the middle of a linked list generally requires O(n) time, as the list elements need to be traversed to find the correct insertion point.

Question 13

In a linked list, what is the primary distinction between the head and tail nodes?

Accepted Answer

The head node points to the first node in the list, while the tail node points to the last node.

Answer

The head node points to the last node, while the tail node points to the first node.

Answer

Both the head and tail nodes store data values.

Question 14

Which of the following options is NOT a valid operation that can be performed on an array?

Accepted Answer

The 'pop' operation, which removes the last element from an array, is not a valid array operation.

Answer

The 'shift' operation removes the first element from an array.

Answer

The 'push' operation appends a new element to the end of an array.

Answer

The 'unshift' operation allows insertion at the beginning of an array.

Question 15

What advantage does a doubly linked list offer over a singly linked list?

Accepted Answer

A doubly linked list enables faster traversal in both directions, as each node contains references to both the previous and next nodes in the list.

Answer

Doubly linked lists require less memory compared to singly linked lists.

Answer

Doubly linked lists provide improved efficiency for random access to list elements.

Question 16

In an array of length n, what is the time complexity of searching for a specific element using linear search?

Accepted Answer

Linear search in an array has a time complexity of O(n), as it requires iterating through the entire array to locate the desired element.

Answer

In the best case, linear search can have a time complexity of O(n log n).

Answer

Linear search in an array typically has a constant time complexity of O(1).

Answer

Linear search has a logarithmic time complexity of O(log n) in an array.

Question 17

Identify a scenario where an array would be a more appropriate data structure compared to a linked list.

Accepted Answer

Arrays are particularly suitable for storing a fixed-size collection of data and accessing the elements directly using their index.

Answer

Arrays are more efficient for implementing queue data structures.

Answer

Arrays are more appropriate for representing graph structures.

Answer

In all cases, linked lists should be preferred over arrays.

Question 18

Which of the following is not an advantage of arrays?

Accepted Answer

Dynamic memory allocation

Answer

Storage of elements of the same type

Answer

Easy insertion and deletion of elements at the end

Answer

Efficient access to elements

Question 19

What is the primary distinction between a one-dimensional array and a multi-dimensional array?

Accepted Answer

The number of indices required to access an element

Answer

The maximum size of the array

Answer

The type of elements stored in the array

Question 20

Consider the following linked list represented as: HEAD -> [A] -> [B] -> [C] -> NULL. If node [B] is deleted, what will be the modified structure of the linked list?

Accepted Answer

HEAD -> [A] -> [C] -> NULL

Answer

HEAD -> [B] -> [C] -> NULL

Answer

HEAD -> [A] -> [B] -> [C] -> NULL

Question 21

Which of the following represents the time complexity of traversing a linked list?

Accepted Answer

O(n)

Answer

O(log n)

Answer

O(1)

Answer

O(n^2)

Question 22

What is the key advantage of using a circular linked list over a singly linked list?

Accepted Answer

Facilitates traversal without losing track of the start

Answer

Enables faster insertion and deletion of elements

Answer

Optimizes memory usage more efficiently

Question 23

Which operation can be performed more efficiently using an array compared to a linked list?

Accepted Answer

Random access to elements

Answer

Searching for a specific element

Answer

Deletion from the middle of the data structure

Answer

Insertion at the beginning of the data structure

Question 24

What is the primary purpose of using a doubly linked list compared to a singly linked list?

Accepted Answer

Enables traversal in both directions

Answer

Allows for additional data to be stored with each node

Answer

Reduces the memory usage

Answer

Enhances the time complexity for insertion and deletion

Question 25

Which of the following operations is not applicable to linked lists?

Accepted Answer

Direct access to a node using its index

Answer

Insertion at any position

Answer

Traversal from the start to the end

Answer

Deletion of any node

Question 26

What is the primary use case for an array?

Accepted Answer

Storing a collection of elements of the same type with a fixed size

Answer

Representing a graph data structure

Answer

Implementing a first-in-first-out (FIFO) queue data structure