#include<iostream>
#include<set>
using namespace std;
int main(){
set<int> se;
se.insert(10);
se.insert(10);
se.insert(5);
cout<<se.size()<<endl;
cout<<endl;
if(se.empty()){
cout<<"empty 1"<<endl;
}
set<int>::iterator it;
int ans=0;
for(it=se.begin(); it!=se.end();it++){
cout<<++ans<<":"<<*it<<endl;
}
cout<<endl;
cout<<"clear"<<endl;
se.clear();
if(se.empty()){
cout<<"empty 2"<<endl;
}
return 0;
}
set
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