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problem on stack

cbrahmamcbrahmam Posts: 3Member
i am a student of mca. i have a problem for my assignment. i need help from the esteemed members.

suppose the input to a stack is 1,2,3,4,5 in the order, i.e., 1 comes first,then 2 and so on. Which of the following rearrangements can be obtained in the output order? for those that can, explain how, giving the sequence of operations. for those outputs that cannot be so obtained, explaing why.
1) 1 2 4 5 3
2) 2 1 4 3 5
3) 2 1 5 3 4
4) 3 1 2 4 5

ok. thanks for your help in advance


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