Data Structures MCQs with Answers
Practice important Data Structures MCQs with answers and explanations.
Multiple Choice Questions
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
View Answer
B
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)
View Answer
B
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
View Answer
B
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
View Answer
B
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
View Answer
C
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
View Answer
D
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
View Answer
B
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
View Answer
C
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
View Answer
B
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
View Answer
B