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In a queue, the initial values of front pointer f rare pointer r should be

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Which data structure allows deleting data elements from front and inserting at rear?
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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 chosen by the implementation.POP is implemented as DELETEMIN(Q)(Q). For a sequence of operations, the keys chosen are in
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Which of the following is not an application of priority queue?
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