Data Structures MCQs with Answers
Practice important Data Structures MCQs with answers and explanations.
Chapter: 40
Q621:
In a skip list, what happens when dropping down past the bottom list during a search?
A. The search continues in the current list
B. The search is terminated with NO_SUCH_KEY
C. The search continues in the upper list
D. The search results in an error
Correct Answer:
B
Chapter: 40
Q622:
What is the time complexity of the search operation in a skip list?
A. O(N)
B. O(log N)
C. O(N log N)
D. O(1)
Correct Answer:
B
Chapter: 40
Q623:
How is the insertion of a new item performed in a skip list?
A. By adding it to every list
B. By using a randomized algorithm and inserting based on the result
C. By directly placing it in the bottom list
D. By using a binary search approach
Correct Answer:
B
Chapter: 40
Q624:
What does the removal process in a skip list involve?
A. Removing all nodes and reconstructing the lists
B. Removing only the specified item and updating pointers
C. Rebalancing the skip list
D. Replacing the item with a placeholder
Correct Answer:
B
Chapter: 40
Q625:
How does a skip list handle the insertion of an item when i is less than h?
A. The item is added to all lists
B. The item is added only to the list S0
C. The item is added to S0 and some lists
D. The item is inserted randomly into different lists
Correct Answer:
C
Chapter: 40
Q626:
What is the primary advantage of using a skip list over a simple linked list?
A. It maintains sorted order efficiently
B. It requires less memory
C. It supports direct access to elements
D. It allows for faster search operations
Correct Answer:
D
Chapter: 40
Q627:
What happens to the lists S1, S2, etc., when deleting an item from a skip list?
A. They are all updated to remove the item
B. Lists with only the special keys are kept
C. Lists are completely removed
D. All lists except the one containing special keys are removed
Correct Answer:
B
Chapter: 40
Q628:
In the context of skip lists, what does a randomized algorithm for insertion use to determine the number of levels?
A. A fixed number of levels
B. A deterministic function
C. A coin toss process
D. A binary search method
Correct Answer:
C
Chapter: 40
Q629:
What does each level in a skip list Si represent?
A. A complete copy of the list S0
B. A subset of the list S0
C. A random selection of elements
D. An ordered list of elements in S0
Correct Answer:
B
Chapter: 40
Q630:
How is the search for an item x initiated in a skip list?
A. From the bottom list S0
B. From the top list S3
C. From the middle of the list
D. From any random list
Correct Answer:
B
Chapter: 41
Q631:
What is a key characteristic of a skip list's structure?
A. Array of next pointers
B. Array of previous pointers
C. Doubly linked nodes
D. Quadruple linked nodes
Correct Answer:
A
Chapter: 41
Q632:
How does a TowerNode in a skip list manage multiple pointers?
A. Uses an array of pointers
B. Uses a single linked list
C. Uses a doubly linked list
D. Uses a multi-level array
Correct Answer:
A
Chapter: 41
Q633:
What does MAXLEVEL specify in the context of a skip list?
A. The maximum number of data elements
B. The maximum number of next pointers
C. The maximum height of the skip list
D. The maximum number of skip list levels
Correct Answer:
C
Chapter: 41
Q634:
What is a major advantage of using a Quad Node compared to a TowerNode?
A. It does not require an array of pointers
B. It requires fewer memory allocations
C. It allows for faster insertions
D. It simplifies the pointer management
Correct Answer:
A
Chapter: 41
Q635:
In a skip list, how is the insertion level of a node determined?
A. By flipping a coin
B. By generating a random number
C. By calculating the node's data value
D. By counting the number of nodes
Correct Answer:
A
Chapter: 41
Q636:
What is the expected time complexity for search operations in a skip list?
A. O(1)
B. O(n)
C. O(log n)
D. O(n^2)
Correct Answer:
C
Chapter: 41
Q637:
How does hashing improve the performance of data retrieval?
A. By storing data in sorted order
B. By using a hash function to map keys to indices
C. By using a balanced tree structure
D. By allocating memory dynamically
Correct Answer:
B
Chapter: 41
Q638:
What is the primary role of a hash function in hashing?
A. To generate unique keys for each data entry
B. To map a key to a specific index in the array
C. To sort the data entries
D. To encrypt the data entries
Correct Answer:
B
Chapter: 41
Q639:
What is the expected space complexity of a skip list with n items?
A. O(n)
B. O(n^2)
C. O(log n)
D. O(n log n)
Correct Answer:
A
Chapter: 41
Q640:
Which of the following hash functions is used in the provided C++ example?
A. sum = sum + s[i];
B. sum = s[i] * i;
C. sum = s[i] ^ i;
D. sum = s[i] + i * TABLESIZE;
Correct Answer:
A