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#include<bits/stdc++.h>
using namespace std;
int main() {
set<int> s;
set<int>::iterator iter;
for(int i = 1 ; i <= 5; ++i) {
s.insert(i);
}
for(iter = s.begin() ; iter != s.end() ; ++iter) {
cout<<*iter<<" ";
cout<<endl;
pair<set<int>::const_iterator,set<int>::const_iterator> pr;
pr = s.equal_range(3);
cout<<"第一个大于等于 3 的数是 ："<<*pr.first<<endl;
cout<<"第一个大于 3的数是 ： "<<*pr.second<<endl;
return 0;
