[c++] <Set>

 1 #include <iostream>
 2 #include <set>
 3 using namespace std;
 4 
 5 int main(){
 6     set<int> s1;
 7     
 8     s1.insert(10);
 9     s1.insert(12);
10     s1.insert(13);
11     s1.insert(9);
12     
13     cout<<"s1集合中元素数量："<<s1.size()<<endl;
14     
15     set<int>::iterator iter = s1.begin();
16     for(iter;iter!=s1.end();iter++)
17         cout<<*iter<<" ";
18     cout<<endl;
19 }