Homework Help: Questions and Answers: Which of the following points is/are not true about Linked List data structure when it is compared with an array?
a) Random access is not allowed in a typical implementation of Linked Lists
b) Access of elements in linked list takes less time than compared to arrays
c) Arrays have better cache locality that can make them better in terms of performance
d) It is easy to insert and delete elements in Linked List
Answer:
To solve this problem, let’s analyze each option one by one to determine which statements about Linked Lists are not true when compared to arrays.
a) Random access is not allowed in a typical implementation of Linked Lists
- This is correct. In a linked list, elements are connected via pointers, and there is no direct way to access an element at a specific index. You have to traverse the list from the head to access an element.
b) Access of elements in linked list takes less time than compared to arrays
- This is incorrect. Accessing elements in an array is faster because arrays provide constant-time random access due to their contiguous memory allocation. In contrast, accessing an element in a linked list requires traversing the list, which takes linear time O(n).
c) Arrays have better cache locality that can make them better in terms of performance
- This is correct. Arrays have better cache locality because their elements are stored in contiguous memory locations. This allows for better use of the CPU cache, making them faster in many cases, especially for iteration.
d) It is easy to insert and delete elements in Linked List
- This is correct. Insertion and deletion operations in a linked list are generally easier and more efficient compared to arrays, especially for inserting or deleting elements in the middle of the list.
Final Answer
Based on the above analysis, the correct answer is b), as it is not true that accessing elements in a linked list takes less time than accessing elements in an array.
b) Access of elements in linked list takes less time than compared to arrays
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