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Ans. Yes we can. But as the underlying structure of the collection class is double linked list, it will eventually have to traverse to the element linearlly and hence would result in bad performance.
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Q42. If a stack is implemented using an array, which end (head or tail) should represent the top ?
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Q48. What can we do if we need to retrieve Fibonacci value at a particular index faster ? Can we use Linked List ?
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Q49. How will you implement your own custom hashmap and linkedlist ?
Ans. The array index starts with 0 because program locates an element using the expression ( BaseAddress + ( Index * size of array Element ), where index is used as an offset. As the starting address is actually the address of first element, the index of first element is used as 0 and so on.
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Q51. Why does an array need continuous memory locations and not Linked List ?
Ans. Array needs continuous memory location because it need to provide random access of it's elements which is not required for Linked List.
Array index acts as an offset from the base address and hence can retrieve the respective element using the expression Base Address + ( Index * Element Size ). This expression could only hold true if the elements are in continuous memory location.
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Ans. Work with two pointers on the linked list - a slow pointer (increments by one node) and a fast pointer (increments by two nodes). If both of these pointers meet at the same node, then there is a cycle in the linked list. Otherwise, no cycle.
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Q61. Implement a Stack with 2 threads in which one thread push data and another pop data.
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Q68. What is the time complexity and space complexity of reversing a Linked List ?