set 基础知识

#include <iostream>
#include <set>using namespace std;int main()
{
set<int> s;
s.insert();
s.insert();
s.insert();
s.insert();
s.insert();
set<int>::iterator it; // mo ren pai xu;
for(it = s.begin(); it != s.end(); it++)
cout<<*it<<" "; cout<<endl;
cout<<s.size()<<endl;
s.clear();
cout<<s.size()<<endl;
s.insert();
s.insert();
s.insert();
s.insert();
s.insert();
for(it = s.begin(); it != s.end(); it++)
cout<<*it<<" "; cout<<endl;
s.erase();
for(it = s.begin(); it != s.end(); it++)
cout<<(*it)<<" "; cout<<endl;
it=s.lower_bound(); cout<<*it<<endl;
while(!s.empty())
{
cout<<" long de "<<endl; s.clear();
}}