65.
How do you calculate the pointer difference in a memory efficient double linked list?

66.
What are the advantages of arrays?

67.
Given an array of size n, let's assume an element is 'touched' if and only if some operation is performed on it(for example, for performing a pop operation the top element is 'touched'). Now you need to perform Dequeue operation. Each element in the array is touched atleast?

69.
Which of the following real world scenarios would you associate with a stack data structure?

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