includes, set_difference, set_intersection, set_symmetric_difference and set_union. : set_difference « STL Algorithms Merge « C++ Tutorial

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C++ Tutorial » STL Algorithms Merge » set_difference 
28.4.3.includes, set_difference, set_intersection, set_symmetric_difference and set_union.
#include <iostream>
#include <algorithm>

using namespace std;

int main()
{
   const int SIZE1 = 10, SIZE2 = 5, SIZE3 = 20;
   int a1SIZE1 12345678910 };
   int a2SIZE2 4567};
   int a3SIZE2 4561115 };

   if includesa1, a1 + SIZE1, a2, a2 + SIZE2 ) )
      cout << "\na1 includes a2";
   else
      cout << "\na1 does not include a2";
      
   if includesa1, a1 + SIZE1, a3, a3 + SIZE2 ) )
      cout << "\na1 includes a3";
   else
      cout << "\na1 does not include a3";

   int differenceSIZE1 ];
   int *ptr = set_differencea1, a1 + SIZE1, a2, a2 + SIZE2, difference );

   int intersectionSIZE1 ];
   ptr = set_intersectiona1, a1 + SIZE1, a2, a2 + SIZE2, intersection );

   int symmetric_differenceSIZE1 ];
   ptr = set_symmetric_differencea1, a1 + SIZE1,a2, a2 + SIZE2, symmetric_difference );

   int unionSetSIZE3 ];
   ptr = set_uniona1, a1 + SIZE1, a3, a3 + SIZE2, unionSet );
   return 0;
}
28.4.set_difference
28.4.1.Determine elements in one set but not in another set
28.4.2.Determine elements of first range without elements of second range by using set_difference()
28.4.3.includes, set_difference, set_intersection, set_symmetric_difference and set_union.
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