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Sorting algorithm

Scheduled Pinned Locked Moved C / C++ / MFC
algorithms
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  • B Offline
    B Offline
    brucewayn
    wrote on last edited by
    #1

    I have 20 names and there makes stored in a map. My requirement is to get hghest marks of top 10 studens. please let me know the sorting algorithim to find that out. Thanks in Advance

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    • B brucewayn

      I have 20 names and there makes stored in a map. My requirement is to get hghest marks of top 10 studens. please let me know the sorting algorithim to find that out. Thanks in Advance

      Q Offline
      Q Offline
      quixqx
      wrote on last edited by
      #2

      find out how value_compare(), it will compare the values that way you will know which key comes first

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      • B brucewayn

        I have 20 names and there makes stored in a map. My requirement is to get hghest marks of top 10 studens. please let me know the sorting algorithim to find that out. Thanks in Advance

        S Offline
        S Offline
        Swapnil Shah
        wrote on last edited by
        #3

        u can use STL <algorithm> http://msdn.microsoft.com/en-us/library/ecdecxh1(VS.80).aspx[^]

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        • B brucewayn

          I have 20 names and there makes stored in a map. My requirement is to get hghest marks of top 10 studens. please let me know the sorting algorithim to find that out. Thanks in Advance

          C Offline
          C Offline
          CPallini
          wrote on last edited by
          #4

          You may try to implement yourself a simple sorting algorithm, like, for instance [^], it maybe an interesting experience. :)

          If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
          This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
          [My articles]

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          • B brucewayn

            I have 20 names and there makes stored in a map. My requirement is to get hghest marks of top 10 studens. please let me know the sorting algorithim to find that out. Thanks in Advance

            S Offline
            S Offline
            Stuart Dootson
            wrote on last edited by
            #5

            If you used this:

            std::map<MarkType, NameType> marksAndStudents;

            (where MarkType is the type you use for a students marks and NameType is the type you use for a students name, then *rbegin() points at the student with the highest mark - try this:

            std::map<int, std::string> s;
            s.insert(std::make_pair(10, "10"));
            s.insert(std::make_pair(20, "20"));
            s.insert(std::make_pair(30, "30"));
            s.insert(std::make_pair(40, "40"));
            s.insert(std::make_pair(50, "50"));
            s.insert(std::make_pair(60, "60"));
            s.insert(std::make_pair(70, "70"));
            s.insert(std::make_pair(80, "80"));
            s.insert(std::make_pair(90, "90"));
            s.insert(std::make_pair(100, "100"));
            s.insert(std::make_pair(110, "110"));
            s.insert(std::make_pair(120, "120"));

            std::map<int, std::string>::const_reverse_iterator it = s.rbegin();
            for (int i=0;i<10;++i)
            {
            std::cout << it->second << std::endl;++it;
            }

            Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

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