Practice linked-list Quizzes
Sharpen your technical edge with advanced linked-list quizzes built for serious learners and professionals. These quizzes challenge your reasoning, improve retention and provide hands-on practice similar to real engineering scenarios. Perfect for upskilling and interview preparation.
Explore All linked-list Quizzes
Learn linked-list step by step with interactive quizzes designed for beginners and learners revising key concepts. Build a strong foundation with clear, structured practice in linked-list.
Question 1
Which of the following is a disadvantage of linked lists over arrays?
1
Ease of insertion and deletion
2
More memory usage
3
Dynamic size
4
No memory wastage
Question 2
What is the time complexity of inserting an element at the head of a singly linked list?
1
O(n)
2
O(n log n)
3
O(log n)
4
O(1)
Question 3
How many pointers are required to implement a singly linked list of size n?
1
2n
2
n
3
n - 1
4
n + 1
Question 4
In the worst case, the number of comparisons needed to search a singly linked list of length n for a given element is
1
log(2*n) -1
2
n
3
n log n
4
log n/2
Question 5
Let M be a singly linked list. Let N be the pointer to an intermediate node p in the list. What is the worst-case time complexity of the best known algorithm to delete the node N from the list?
1
O(log n)
2
O(n)
3
O(1)
4
O(log(2*n))
Question 6
What is the worst case time complexity of inserting n elements into an empty linked list, if the linked list needs to be maintained in sorted order ?
1
O(n)
2
O(1)
3
O(n log n)
4
O(n^2)
Question 7
In a doubly linked list containing nodes A ↔ B ↔ C ↔ D ↔ E ↔ F, if a pointer p points to node E, then what does p.previous.next refer to?
1
F
2
A
3
E
4
D
Question 8
Which of the following implementations allows concatenation of two lists in O(1) time, assuming you maintain head and tail pointers?
1
Doubly linked list
2
Array-based list
3
Singly linked list
4
Circular doubly linked list
Question 9
What is the time complexity of searching for an arbitrary element in a singly linked list of size n?
1
log(2*n) -1
2
log n/2
3
n
4
n log n
Question 10
Which of the following data-structures is a variation of a linked list that stores multiple elements per node to improve cache performance and reduce pointer overhead?
1
XOR Linked List
2
Skip List
3
Unrolled Linked List
4
Circular Doubly Linked List
Question 11
For a doubly linked list supporting insertion and deletion at arbitrary positions with head and tail pointers maintained, what is the worst-case time complexity of inserting after a given node when you already have the reference to that node?
1
O(n)
2
O(n log n)
3
O(log n)
4
O(1)
Question 12
Given a linked list implementation that uses only a single pointer field per node (i.e. no “prev”), but supports efficient reverse traversal, which technique is most likely used?
1
Skip list layering
2
Unrolled linked list
3
Maintaining a tail pointer and storing “prev” implicitly
4
XOR Linked List (storing XOR of next and prev addresses)
Question 13
Suppose you define a “skip linked list” where each node has additional forward pointers (“levels”) allowing jumps further ahead (similar to skip list concept). What is the expected time complexity to search for an element in this structure (assuming uniform level distribution)?
1
O(n)
2
O(log n)
3
O(√n)
4
O(1)
Question 14
What is the space complexity to completely delete all nodes in a linked list (i.e. deallocate or free all nodes) assuming you traverse from head and free one by one?
1
O(n) extra space
2
O(log n) extra space
3
O(n²) extra space
4
O(1) extra space
Question 15
Which of the following is not a typical advantage of using a linked list over an array?
1
Constant-time insertion/deletion at known position (given node)
2
Direct random access to the i-th element in O(1) time
3
Dynamic size (can grow/shrink easily)
4
Efficient memory when large contiguous block is not available
Question 16
If you have a circular singly linked list (i.e. tail -> head link) with only a pointer to the tail node (and thus tail.next is the head), what is the time complexity to insert a new node at the beginning?
1
O(n)
2
O(log n)
3
O(1)
4
O(n²)
Question 17
In the context of a skip list implemented over a linked list backbone, what trade-off does increasing the number of levels (forward links) per node typically involve?
1
Higher memory overhead, lower search time
2
Higher memory overhead, higher search time
3
Lower memory overhead, lower search time
4
Lower memory overhead, higher search time
Question 18
Which of the following sorting algorithms can be used to sort a random linked list with minimum time complexity?
1
Heap Sort
2
Quick Sort
3
Insertion Sort
4
Merge Sort
Question 19
In Java’s java.util.LinkedList<E>, which of the following interfaces does it implement?
1
List, Deque, Cloneable, Serializable
2
Deque only
3
List only
4
List and Deque
Question 20
For Java’s LinkedList<E>, what is the time complexity of accessing the element at index i (i.e. get(i)) in worst‐case?
1
O(n)
2
O(n²)
3
O(1)
4
O(log n)