set容器

#include<set>#include<iostream>#include<cstdio>using namespace std;int main(){//freopen("a.in","r",stdin);set<int> s;int m,t;s.clear();      //清空 cin>>m; while(m--){cin>>t;s.insert(t);}cout<<s.size()<<endl;  //计算总个数 for(set<int>::iterator it(s.begin());it!=s.end();it++) cout<<*it<<' ';cout<<endl;return 0;}