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In conversion from prefix to postfix using stack data-structure, if operators and operands are pushed and popped exactly once, then the run-time complexity is ............

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MCQ
1.
Consider these functions:
push() : push an element into the stack

pop() : pop the top-of-the-stack element

top() : returns the item stored in top-of-the-stack-node

What will be the output after performing these sequence of operations

push(20);

push(4);

top();

pop();

pop();

pop();

push(5);

top();
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Which of the following applications may use a stack?
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