题解：

用map存球 然后判断球

#include<iostream>
#include<cstring>
#include<map>

using namespace std;

int main()
{
    map<string,int>aaa;
    while(true)
    {
        map<string,int>aaa;
        int count=0;
        cin>>count;
        if(count>0&&count<=1000)
        {
            string colors;
            for(int i=0;i<count;i++)
            {
                cin>>colors;
                if(aaa.find(colors)==aaa.end())
                    {
                        aaa.insert(map<string,int>::value_type(colors,1));
                    }
                else
                {
                    aaa[colors]=aaa[colors]+1;
                }
            }
            int c=0;
            string color;
            for(map<string,int>::iterator it=aaa.begin();it!= aaa.end();++it)
            {
                if(c<it->second)
                {
                    c=it->second;
                    color=it->first;
                }
            }
            cout<<color<<endl;
        }
        else if(count==0)
        break;
    }
return 0;
}