C++ 迭代器 容器

#include<iostream>
#include<string>
#include<iterator>
#include<map>
using namespace std;
int main(){
    int n;
    while(cin>>n&&n)
    {
        map<string, int> Balloon;
        string s;
        for(int i=0;i<n;i++)
        {
            cin >> s;
            Balloon[s]++;
        }

        int iMax = 0;
        map<string,int>::iterator point,loc;
        for(point = Balloon.begin();point!=Balloon.end();point++)
        {
            if(iMax<point->second)
            {
                iMax = point->second;
                loc = point;
            }
        }
        cout<<loc->first<<endl;
    }
    return 0;
}

#include<iostream>
#include<vector>
using namespace std;
void display(vector<int> &v);
int main(){
    cout<<"Hello"<<endl;
    int i;
    vector<int> v,v2(10);
    cout<<"v1 length:"<<v.size()<<endl;
    cout<<"v2 length:"<<v2.size()<<endl;

    v.push_back(111);

    return 0;
}
void display(vector<int> &v)
{
    
}