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  1. #1
    Registered User
    Join Date
    Mar 2010
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    40

    Question How to compare 2 Lists?

    Hi,

    I have two lists, QList<int>list1;and QList<int>list2; List1 have 20 elements and list2 have 10 elements. I want to compare these two list and also want to store the matched elements in third list.

    Thanks,
    Monali.

  2. #2
    Super Contributor
    Join Date
    Oct 2009
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    4,326

    Re: How to compare 2 Lists?

    You can get idea how to do that from this sample program
    http://www.experts-exchange.com/Prog..._22974817.html
    Complexity of algorithm is O(M * N), however, it can be reduced to O(M + N) in case lists are sorted.

  3. #3
    Super Contributor
    Join Date
    Jul 2008
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    2,020

    Re: How to compare 2 Lists?

    In case you are looking for a way to do this with a Qt call: forget it.

    I suggest you just u8se two for() lists, especially as the lists are so small...
    The lines above are the best I have to offer.If anyone of you is of more advanced knowledge, I ask for your patience and understanding! - unknown arab poet
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  4. #4
    Super Contributor
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    Nov 2009
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    Re: How to compare 2 Lists?

    Well, you either compare every element in one to every element in the other, with two nested loops, or you use qSort to sort the lists and step through them in sync with each other.

    Either way requires some actual programming skill, I'm afraid -- no cookbook.

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