#include <iostream>
#include <set>

using namespace std;

typedef struct tagStudentInfo
{
??int nID;
??string strName;
??bool operator <(tagStudentInfo const& _A) const//升序排列

????{
???? if(nID<_A.nID)
???? return true;
???? if(nID == _A.nID)
???? return strName.compare(_A.strName) < 0;
????????return false;
????}
}sInfo,*PsInfo;

int main()
{
??set<sInfo>setS;
??sInfo stuInfo;

??stuInfo.nID = 10;
??stuInfo.strName = "test1";
??setS.insert(stuInfo);
??
??stuInfo.nID = 20;
??stuInfo.strName = "test2";
??setS.insert(stuInfo);

??set<sInfo>::iterator sIter;
??for(sIter=setS.begin(); sIter!=setS.end(); sIter++)
??{
????cout <<(*sIter).nID <<" "<< (*sIter).strName << endl;
??}

??set<int>a;
??set<int>b;
??set<int>c;
??set<int>d;
??set<int>e;
???
??a.insert(1);
??a.insert(2);
??a.insert(3);
??a.insert(4);
??a.insert(5);

??b.insert(3);
??b.insert(4);
??b.insert(5);
??
??set_union(a.begin(), a.end(), b.begin(), b.end(), inserter(c, c.begin()));
??set<int>::iterator s;
??for(s=c.begin(); s!=c.end(); s++)
??{
????cout <<(*s)<<",";
??}
??cout << endl;
??
??set_intersection(a.begin(), a.end(), b.begin(), b.end(), inserter(d, d.begin()));
??for(s=d.begin(); s!=d.end(); s++)
??{
????cout <<(*s) <<",";
??}
??cout << endl;
??
??set_difference(a.begin(), a.end(), b.begin(), b.end(), inserter(e, e.begin()));
??for(s=e.begin(); s!=e.end(); s++)
??{
????cout <<(*s)<<",";
??}
??cout <<endl;
??
??return 0;
}????