Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > The five items: A, B, C, D, and E are pushed ...
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The five items: A, B, C, D, and E are pushed in a stack, one after other starting from A. The stack is popped four items and each element is inserted in a queue. The 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)A
- b)B
- c)C
- d)D
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
The five items: A, B, C, D, and E are pushed in a stack, one after oth...
Explanation:
The given problem involves operations on a stack and a queue. Let's go step by step to understand the solution.
Step 1:
The items A, B, C, D, and E are pushed onto the stack one after another in the order A, B, C, D, E.
Stack: E -> D -> C -> B -> A
Step 2:
The stack is popped four times, and each popped element is inserted into a queue.
Queue: A -> B -> C -> D
Step 3:
The two elements are deleted from the queue, which means the first two elements from the front of the queue are removed.
Queue: C -> D
Step 4:
The two deleted elements, C and D, are pushed back onto the stack. Since the last element pushed onto the stack will be at the top, the order of insertion will be D followed by C.
Stack: C -> D -> E -> B -> A
Step 5:
Now, one item is popped from the stack. As per the order of insertion, the topmost element of the stack is popped.
Popped Item: C
Therefore, the correct answer is option D.
Summary:
- The items A, B, C, D, and E are pushed onto the stack in the order A, B, C, D, E.
- The stack is popped four times, and each popped element is inserted into a queue.
- The two elements, C and D, are deleted from the queue.
- The two deleted elements, C and D, are pushed back onto the stack in the order D, C.
- One item is popped from the stack, resulting in the popped item being C.
The given problem involves operations on a stack and a queue. Let's go step by step to understand the solution.
Step 1:
The items A, B, C, D, and E are pushed onto the stack one after another in the order A, B, C, D, E.
Stack: E -> D -> C -> B -> A
Step 2:
The stack is popped four times, and each popped element is inserted into a queue.
Queue: A -> B -> C -> D
Step 3:
The two elements are deleted from the queue, which means the first two elements from the front of the queue are removed.
Queue: C -> D
Step 4:
The two deleted elements, C and D, are pushed back onto the stack. Since the last element pushed onto the stack will be at the top, the order of insertion will be D followed by C.
Stack: C -> D -> E -> B -> A
Step 5:
Now, one item is popped from the stack. As per the order of insertion, the topmost element of the stack is popped.
Popped Item: C
Therefore, the correct answer is option D.
Summary:
- The items A, B, C, D, and E are pushed onto the stack in the order A, B, C, D, E.
- The stack is popped four times, and each popped element is inserted into a queue.
- The two elements, C and D, are deleted from the queue.
- The two deleted elements, C and D, are pushed back onto the stack in the order D, C.
- One item is popped from the stack, resulting in the popped item being C.
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Community Answer
The five items: A, B, C, D, and E are pushed in a stack, one after oth...
When five items: A, B, C, D, and E are pushed in a stack: Order of stack becomes: A, B, C, D, and E (A at the bottom and E at the top.) stack is popped four items and each element is inserted in a queue: Order of queue: B, C, D, E (B at rear and E at the front) Order of stack after pop operations = A. Two elements deleted from the queue and pushed back on the stack: New order of stack = A, E, D(A at the bottom, D at the top) As D is on the top so when pop operation occurs D will be popped out. So, correct option is (D).
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The five items: A, B, C, D, and E are pushed in a stack, one after other starting from A. The stack is popped four items and each element is inserted in a queue. The two elements are deleted from the queue and pushed back on the stack. Now one item is popped from the stack. The popped item isa)Ab)Bc)Cd)DCorrect answer is option 'D'. Can you explain this answer?
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