Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > The five items P,Q,R,S and T are pushed in a ...
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The five items P,Q,R,S and T are pushed in a stack, one after the other starting from P. The stack is popped four times and each element is inserted in a queue. Then two elements are deleted from the queue and pushed back on the stack. now one item is popped from the stack. The popped item is:
- a)P
- b)R
- c)Q
- d)S
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
The five items P,Q,R,S and T are pushed in a stack, one after the othe...
Explanation:
- Pushing items into the stack:
- Items P, Q, R, S, and T are pushed into the stack, one after the other starting from P.
- Popping items from the stack and inserting into the queue:
- The stack is popped four times, and each element is inserted into a queue. So, the order of elements in the queue will be T, S, R, Q.
- Deleting two elements from the queue and pushing back on the stack:
- Two elements are deleted from the queue, so the remaining elements are R and Q. These elements are then pushed back onto the stack.
- Popping one item from the stack:
- Finally, one item is popped from the stack. Since the last two elements pushed onto the stack were R and Q, the item that will be popped from the stack is S.
Therefore, the correct answer is option 'D' - S.
- Pushing items into the stack:
- Items P, Q, R, S, and T are pushed into the stack, one after the other starting from P.
- Popping items from the stack and inserting into the queue:
- The stack is popped four times, and each element is inserted into a queue. So, the order of elements in the queue will be T, S, R, Q.
- Deleting two elements from the queue and pushing back on the stack:
- Two elements are deleted from the queue, so the remaining elements are R and Q. These elements are then pushed back onto the stack.
- Popping one item from the stack:
- Finally, one item is popped from the stack. Since the last two elements pushed onto the stack were R and Q, the item that will be popped from the stack is S.
Therefore, the correct answer is option 'D' - S.
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Community Answer
The five items P,Q,R,S and T are pushed in a stack, one after the othe...
Given five items P, Q, R, S, and T.
These are pushed into the stack as :
Now stack is popped four times, and each item popped is inserted into the queue.
So, items that are popped from the stack are: T, S, R, Q
After insertion into queue, queue looks like this:
Now, two items are deleted from the queue which is: T, S
These are inserted back into the stack.
Stack will be :
Queue will be :
Now, one item is popped from the stack which is S.
These are pushed into the stack as :
Now stack is popped four times, and each item popped is inserted into the queue.
So, items that are popped from the stack are: T, S, R, Q
After insertion into queue, queue looks like this:
Now, two items are deleted from the queue which is: T, S
These are inserted back into the stack.
Stack will be :
Queue will be :
Now, one item is popped from the stack which is S.
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The five items P,Q,R,S and T are pushed in a stack, one after the other starting from P. The stack is popped four times and each element is inserted in a queue. Then two elements are deleted from the queue and pushed back on the stack. now one item is popped from the stack. The popped item is: a)Pb)Rc)Qd)SCorrect answer is option 'D'. Can you explain this answer?
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