multimap的使用 in C++，同一个关键码存在多个值

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <map>
#include <fstream>
#include <sstream>
void ReadDataFromFile(std::string &filename, std::vector<std::vector<std::string> > &lines_feat) {
    std::ifstream vm_info(filename.c_str());
    std::string lines, var;
    std::vector<std::string> row;
    lines_feat.clear();
    while(!vm_info.eof()) {
        getline(vm_info, lines);
        if(lines.empty())
            break;
        std::stringstream stringin(lines);
        row.clear();
        while(stringin >> var) {
            row.push_back(var);
        }
        lines_feat.push_back(row);
    }
}
template <class T>
void Display2DVector(std::vector<std::vector<T> > &vv) {
    /*field0 field1 field2...*/
    for(size_t i=0;i<vv.size();++i) {
        for(typename::std::vector<T>::const_iterator it=vv.at(i).begin(); it!=vv.at(i).end(); ++it) {
            std::cout<<*it<<" ";
        }
        std::cout<<"
";
    }
    std::cout<<"--------the total rows of the raw data is: "<<vv.size()<<" rows.
";
}
template <class T>
void DisplayMapData(std::map<std::string, std::vector<T> > &mymap) {
    /*the format of map_data is (key, vector), in which value is a vector of optional info*/
    for(typename::std::map<std::string, std::vector<T> >::const_iterator it=mymap.begin(); it!=mymap.end(); ++it) {
        std::cout<<it->first<<", ";
        typename::std::vector<T>::const_iterator sit;
        for(sit=it->second.begin(); sit!=it->second.end(); ++sit) {
            std::cout<<*sit<<" ";
        }
        std::cout<<"
";
    }
    std::cout<<"--------the total records of the Map is: "<<mymap.size()<<"
";
}
template <class T>
void Vectors2Multimap(std::vector<std::vector<T> > &vv, std::multimap<std::string, std::vector<T> > &mymap) {
    /*-----convert the 2d vector(the original data) to multimap(ip, <vector>)-------*/
    for(size_t i=0; i<vv.size(); ++i) {
        size_t field=0;
        std::vector<std::string> vm_s;
        vm_s.clear();
        for(typename::std::vector<T>::const_iterator it=vv.at(i).begin();it!=vv.at(i).end();++it) {
            size_t len=vv.at(i).size();
            if(len == 1) {
                vm_s.push_back("value is none");
            }
            else if(len > 1 && field) {
                vm_s.push_back(*it);
                field++;
            }
            else {
                field++;
            }
        }
        mymap.insert(make_pair(vv.at(i).front(), vm_s));
    }
}
template <class T>
void ProcessFun(std::vector<std::vector<T> > &vv, std::map<std::string, std::vector<T> > &mymap) {
    typedef typename::std::multimap<std::string, std::vector<T> >::const_iterator I;
    std::multimap<std::string, std::vector<T> > mulmap;
    Vectors2Multimap(vv, mulmap);
    std::ofstream outfile;
    outfile.open("out.csv", std::ios::out);
    for(typename::std::map<std::string, std::vector<T> >::const_iterator it=mymap.begin(); it!=mymap.end(); ++it) {
        std::string ip=it->first;
        std::cout<<ip<<"*********************************************************
";
        std::pair<I, I> Info=mulmap.equal_range(ip);
        typename::std::vector<T>::const_iterator sit;
        if(Info.second==Info.first) {
            for(sit=it->second.begin(); sit!=it->second.end(); ++sit) {
                std::cout<<ip<<", "<<*sit<<", 未反馈"<<std::endl;
                outfile<<ip<<", "<<*sit<<", 未反馈"<<std::endl;
            }
        }
        else {
            std::vector<std::string> v_ac;
            v_ac.clear();
            for(I i=Info.first; i!=Info.second; ++i) {
                v_ac.push_back(i->second.front());
            }
            for(sit=it->second.begin(); sit!=it->second.end(); ++sit) {
                typename::std::vector<T>::const_iterator find_it;   
                find_it=std::find(v_ac.begin(), v_ac.end(), *sit);
                if(find_it == v_ac.end()) {
                    std::cout<<ip<<", "<<*sit<<", 未反馈"<<std::endl;
                    outfile<<ip<<", "<<*sit<<", 未反馈"<<std::endl;
                }
                else {
                    std::cout<<ip<<", "<<*sit<<", 反馈"<<", 已授权";
                    outfile<<ip<<", "<<*sit<<", 反馈"<<", 已授权";
                    for(I i=Info.first; i!=Info.second; ++i) {
                        std::string a_ip=i->first, ac=i->second.front();
                        if(a_ip == ip && ac == *sit && i->second.size() > 1) {
                            std::cout<<", "<<i->second.at(1)<<", ";
                            outfile<<", "<<i->second.at(1)<<", ";
                            std::cout<<i->second.back()<<"
";
                            outfile<<i->second.back()<<"
";
                        }
                        if(a_ip == ip && ac == *sit && i->second.size() == 1) {
                            std::cout<<std::endl;
                            outfile<<std::endl;
                        }
                    }
                }
            }
        }
    }
    outfile.close();
}
template <class T>
void Vectors2Map(std::vector<std::vector<T> > &vv, std::map<std::string, std::vector<T> > &mymap) {
    /*-----convert the 2d vector(the original data) to map(key, value) (ip, <vector>)-------*/
    for(size_t i=0; i<vv.size(); ++i) {
        size_t field=0;
        std::vector<std::string> vm_s;
        vm_s.clear();
        for(typename::std::vector<T>::const_iterator it=vv.at(i).begin();it!=vv.at(i).end();++it) {
            size_t len=vv.at(i).size();
            if(len == 1) {
                vm_s.push_back("value is none");
            }
            else if(len > 1 && field) {
                vm_s.push_back(*it);
                field++;
            }
            else {
                field++;
            }
        }
        mymap.insert(make_pair(vv.at(i).front(), vm_s));
    }
}
int main() {
    std::map<std::string, std::vector<std::string> > my_mapa, my_mapb;;
    std::vector<std::vector<std::string> > lines_feata, lines_featb;;
    std::string filename_a="serverAC.txt", filename_b="boss4a.txt";
    /*read data from file to 2d vector*/
    ReadDataFromFile(filename_a, lines_feata);
    ReadDataFromFile(filename_b, lines_featb);
    /*display the raw data*/
    //Display2DVector(lines_feata);
    //Display2DVector(lines_featb);
    /*convert the 2d vectors to map*/
    Vectors2Map(lines_feata, my_mapa);
    //DisplayMapData(my_mapa);
 
    ProcessFun(lines_featb, my_mapa);
    return 0;
}