Arrays and Linked Lists - Exam Prep for Competitive Exams

Arrays and Linked Lists - Complexity Analysis - Real World Applications

Q. What is the average time complexity for searching an element in an unsorted array?

Solution

In an unsorted array, you may need to check each element, leading to an average time complexity of O(n).

Correct Answer: B — O(n)

Q. What is the time complexity of deleting an element from a linked list when you have a pointer to that node?

Solution

If you have a pointer to the node to be deleted, the deletion can be done in constant time, O(1).

Correct Answer: A — O(1)

Q. What is the worst-case time complexity for bubble sort?

Solution

The worst-case time complexity for bubble sort occurs when the array is sorted in reverse order, resulting in O(n^2).

Correct Answer: C — O(n^2)

Q. Which data structure is more memory efficient for dynamic data storage?

Solution

Linked lists are more memory efficient for dynamic data storage as they do not require a predefined size like arrays.

Correct Answer: B — Linked List

Q. Which data structure is more memory efficient for storing a list of items with frequent insertions and deletions?

Solution

Linked lists are more memory efficient for frequent insertions and deletions compared to arrays, which may require resizing.

Correct Answer: B — Linked List

Q. Which of the following is a real-world application of linked lists?

Solution

Linked lists can be used to implement stacks, store collections, and maintain playlists, making option 'All of the above' correct.

Correct Answer: D — All of the above

Q. Which of the following is NOT a characteristic of arrays?

Solution

Arrays have a fixed size and do not support dynamic resizing; this is a characteristic of linked lists.

Correct Answer: C — Dynamic resizing

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