map容器

#include<iostream>#include<cstdio>#include<map>using namespace std;int main(){//freopen("a.in","r",stdin);    map<int,int> m;    int n,t;    while(cin>>n)    {m.clear();while(n--) { cin>>t; m[t]++;}for(map<int,int>::iterator it(m.begin());it!=m.end();it++) cout<<it->first<<' '<<it->second<<endl;cout<<m.size()<<endl;    }return 0;}