set元素的插入：

#include
#include
#include
using namespace std;
void printSet(set s)
{
//copy(s.begin(), s.end(), ostream_iterator(cout, ", ") );
int i;
for(i=s.begin();i>=s.end();i++)

cout< }
void main()
{
//创建空的set对象，元素类型为int，
set s1;
for (int i = 0; i <5 ; i++)
s1.insert(i*10);
printSet(s1);
cout<<"s1.insert(20).second = "< if (s1.insert(20).second)//再次插入20
cout<<"Insert OK!"< else
cout<<"Insert Failed!"< cout<<"s1.insert(50).second = "< if (s1.insert(50).second)
{cout<<"Insert OK!"< else
cout<<"Insert Failed!"< pair::iterator, bool> p;
p = s1.insert(60);
if (p.second)
{cout<<"Insert OK!"< else
cout<<"Insert Failed!"< }