Which of the following operations cannot be implemented in O(1) for a unsorted singly linked list with head and tail pointers?
a) deletion of the last node
b) Insertion at the end
c) Deletion of the front node
d) Insertion at front

• a) deletion of the last node
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• answer is A) deletion of the last node
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• a) deletion of last node
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• A) deletion of last node
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• D) Insertion at front
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• Deletion of the last node. As you can't simply delete the last node if you do you'll lose the tail pointer. first, you need to point at the second last node for which you have to start from the head. it'll take more than O(n).
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