Answer :
The scenario involves the manipulation of a stack and a queue, showcasing the difference between LIFO and FIFO principles.
1. Items A, B, C, D, and E are pushed onto an initially empty stack S in that order.
2. The stack S follows the Last-In-First-Out (LIFO) principle, meaning the last item pushed onto the stack is the first one to be popped off.
3. After pushing the items onto the stack, we need to pop them three times and insert each popped item into an initially empty queue.
4. The queue follows the First-In-First-Out (FIFO) principle, so the first item to be popped off the stack will be the first one to be inserted into the queue.
5. After popping and inserting three items, the remaining items in the stack will remain in the same order.
6. The items in the queue will be in the order of the items popped off the stack, with the first popped item at the front of the queue.
The given scenario describes pushing items A, B, C, D, and E onto an empty stack in order, then popping them three times and inserting each popped item into an empty queue. The stack follows the LIFO principle, so the last item pushed is the first one popped.
The queue, on the other hand, follows the FIFO principle, meaning the first item to be popped from the stack is the first one inserted into the queue. After three pops, the remaining items in the stack retain their original order, while the queue contains the popped items in the order they were popped.
Therefore, the scenario involves the manipulation of a stack and a queue, showcasing the difference between LIFO and FIFO principles.
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