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A priority queue is used to implement a stack S that stores characters. PUSH (C) is implemented as INSERT (Q, C, K), where K is an appropriate integer key closed by the implementation. POP is implemented as DELETEMIN (Q). For a sequence of operation, the keys chosen are in
  • a)
    strictly decreasing order 
  • b)
    strictly increasing order
  • c)
    non-decreasing order
  • d)
    non-increasing order
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A priority queue is used to implement a stack S that stores characters...
We are implementing a stack using a priority queue. Stack implementation is always Last In First Out (LIFO) order.
As given, POP is implemented as DELETEMIN (Q), that means the stack returns minimum element always.
So, we need to implement PUSH (C) using INSERT (Q, C, K), where K is the key chosen from a strictly-decreasing order (only this order will ensure that the stack will return minimum element when we POP an element). It will satisfy the Last In First Out (LIFO) property of stack. That is, answer option (1) is true.
Option (4) (non-increasing order) cannot be true because two same (identical) numbers cannot have same priority as priority should be distinguishable for each number.
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A priority queue is used to implement a stack S that stores characters. PUSH (C) is implemented as INSERT (Q, C, K), where K is an appropriate integer key closed by the implementation. POP is implemented as DELETEMIN (Q). For a sequence of operation, the keys chosen are ina)strictly decreasing orderb)strictly increasing orderc)non-decreasing orderd)non-increasing orderCorrect answer is option 'A'. Can you explain this answer?
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A priority queue is used to implement a stack S that stores characters. PUSH (C) is implemented as INSERT (Q, C, K), where K is an appropriate integer key closed by the implementation. POP is implemented as DELETEMIN (Q). For a sequence of operation, the keys chosen are ina)strictly decreasing orderb)strictly increasing orderc)non-decreasing orderd)non-increasing orderCorrect answer is option 'A'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about A priority queue is used to implement a stack S that stores characters. PUSH (C) is implemented as INSERT (Q, C, K), where K is an appropriate integer key closed by the implementation. POP is implemented as DELETEMIN (Q). For a sequence of operation, the keys chosen are ina)strictly decreasing orderb)strictly increasing orderc)non-decreasing orderd)non-increasing orderCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A priority queue is used to implement a stack S that stores characters. PUSH (C) is implemented as INSERT (Q, C, K), where K is an appropriate integer key closed by the implementation. POP is implemented as DELETEMIN (Q). For a sequence of operation, the keys chosen are ina)strictly decreasing orderb)strictly increasing orderc)non-decreasing orderd)non-increasing orderCorrect answer is option 'A'. Can you explain this answer?.
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