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gistfile1.hpp

#include <iostream>
#include <algorithm>
#include <iterator>
#include <set>
using namespace std;

int main ()
{
        int a[] = { 1 , 2 , 3 , 5 };
        int b[] = { 2 , 3 , 4 };
        set<int> out;
        set<int> first( a , a + 4 );
        set<int> second( b , b + 3 );

        set_difference( first.begin() , first.end() ,
                        second.begin() , second.end() ,
                        inserter( out , out.begin() )
        );

        //output
        copy( out.begin() , out.end() , ostream_iterator<int>( cout , " " ) );
        cout << endl;

        return 0;
}