Arrays and Linked Lists - Python for Competitive Exams

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Arrays and Linked Lists - Implementations in Python - Advanced Concepts

Q. What is the primary advantage of using a queue over a stack?

A. LIFO order
B. FIFO order
C. Dynamic size
D. Memory efficiency

Solution

A queue operates in FIFO (First In, First Out) order, which is its primary advantage over a stack.

Correct Answer: B — FIFO order

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

A. O(1)
B. O(n)
C. O(log n)
D. O(n log n)

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)

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

A. O(1)
B. O(n)
C. O(log n)
D. O(n log n)

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)

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Q. Which of the following sorting algorithms has the best average time complexity?

A. Bubble Sort
B. Insertion Sort
C. Quick Sort
D. Selection Sort

Solution

Quick Sort has an average time complexity of O(n log n), which is better than the other options listed.

Correct Answer: C — Quick Sort

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