Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Categories

problem on stack

cbrahmamcbrahmam Member Posts: 3
hi,
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

Comments

  • AsmGuru62AsmGuru62 Member Posts: 6,519
    [color=Blue]"Elements are removed from the stack in the reverse order to the order of their addition."

    [link=http://en.wikipedia.org/wiki/Stack_(data_structure)]http://en.wikipedia.org/wiki/Stack_(data_structure)[/link]
    [/color]
  • cbrahmamcbrahmam Member Posts: 3
    thanks a lot
    but my doubt is when we pop an element from the stack can we store it in a variable? if we can then all the four output order is possible. isnt it? when we pop an element its removed from the stack. can we re introduce the element to the same stack?
  • donggo_cndonggo_cn Member Posts: 1
    1) and 2) are correct.

  • amit1487amit1487 Member Posts: 1
    Yes, friend
    we can do it.....we can put all poped element again into the same stack..just create variable for each poped element n store...n as stack is empty push all those var. one by one into the stack...

    its my pleasure to answer your question......
    have a nice weekend
  • bilderbikkelbilderbikkel Member Posts: 754
    : 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

    Well, one can obtain any of these, when needed:

    [code]
    //Creates the std::stack as described
    const std::stack s = CreateStack();

    //Copy it to a std::vector
    const std::vector v(s);

    //Shuffle it!
    std::random_shuffle(v.begin(),v.end());
    [/code]
Sign In or Register to comment.