#include
#include <string>
#include <set>
using namespace std;
int main()
{
string name[]={"tian","dsp","su","chu"};
set<string> setname;
for (int i=0;i<4;i++)
setname.insert(name[i]);
set<string>::iterator it;
for (it=setname.begin();it!=setname.end();it++)
cout<<*it<<" ";
it=setname.find("dsp");
cout<<endl;
cout<<*it<<endl;
setname.erase(it);
for (it=setname.begin();it!=setname.end();it++)
cout<<*it<<" ";
cout<endl;
for (int i=0;i<4;i++)
if (setname.count(name[i])>0)
cout<" in set"<<endl;
else
cout<" not in set"<<endl;
setname.clear();
if (setname.empty())
cout<<"empty"<<endl;
system("pause");
return 0;
}
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