Q. Stack A has 3 Elements in it Say X,Y and Z with X on top.

1. Stack B is empty.
2. An Element popped out from Stack A can be printed immediately or pushed to stack B.
3. An Element popped out from Stack B can only be printed.

In this arrangement, which of the following permutations of X,Y,Z are not possible ?

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Q. An item that is read as input can be either pushed to a stack and later popped and printed, or printed directly. Which of the following will be the output if the input is the sequence of items 1, 2, 3, 4, 5 ?

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Q. Which of the following is a collection of items into which items can be inserted arbitrarity and from which only the smallest item can be removed?

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Q. 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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Q. Queues serve major role in

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Q. Which of the following data structure may give overflow error,even though the current number of element in it is less than its size?

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Q. Number of "ADD" and "REMOVE" operations required to access n/2th elements of a queue of "n" elements so that the original queue remain the same after the access is (take help of another queue.)

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Q. The initial configuration of a queue is a, b, c, d, ('a' is in the front end). To get the configuration d, c, b, a, one needs a minimum of

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Q. Queue can be used to implement

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Q. The postfix form of the expression (A+B)∗(C∗D-E)∗F/G is

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Q. What is the postfix form of the following prefix expression -A/B*C$DE

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Q. Which of the following types of expressions does not require precedence rule when evaluated?

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Q. If memory for the run-time stack is only 150 cells(words), how big can N be in Factorial(N) before encounterring stack overflow?

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Q. Using Pop(S1, Item) Push(S1,Item) Read(Item) Print(Item) the variables S1 represents (stack) and Item are given the input file: A,B,C,D,E,F Which stacks are possible:

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Q. Using Pop (S1,Item) ,Push(S1, Item), Getlist(Item), Pop(S2,Item), and the variables S1,S2(stacks with Top1 and Top2) and Item and given the input file: A,B,C,D,E,F Which stack are possible?

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Q. Following sequence of operations is performed on a stack push(1),push(2),pop, push(1),push(2)pop,pop,pop,push(2),pop.The sequence of poped out values are

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Q. In eveluating the arithmetic expression 2*3-(4+5),using stacks to evaluate its equivalent postfix form, which of the following stack configuration is not possible?

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Q. Stack A has the entries a,b,c(with a on top). Stack B is empty.An entry popped out of stack A can be printed immediately or pushed to stack B.An entry popped out of the stack B can only be printed. In this arrangement, which of the following permutations of a,b,c are not possible?

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Q. Stack can't be used to

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Q. Which of the following permutations can be obtained in the output(in the same order),using a stack assuming that the input is the sequence 1,2,3,4,5 in that order?

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