STL_multimap

#include<iostream>
#include<string>
#include<map>
#include<algorithm>
using namespace std;
typedef int keytype;
typedef pair<const keytype,string> pair1;
typedef multimap<keytype,string> mapcode;

void main(){
    

mapcode codes;

codes.insert(pair1(415,"san francisco"));
codes.insert(pair1(510,"oakland"));
codes.insert(pair1(718,"brooklyn"));
codes.insert(pair1(718,"staten island"));
codes.insert(pair1(415,"san rafael"));
codes.insert(pair1(510,"berkeley"));

cout<<"number of cities with area code 415:"<<codes.count(415)<<endl;
cout<<"number of cities with area code 718:"<<codes.count(718)<<endl;
cout<<"number of cities with area code 510:"<<codes.count(510)<<endl;

cout<<"area code city\n";
mapcode::iterator it;
for(it=codes.begin();it!=codes.end();it++)
    cout<<"    "<<(*it).first<<"   "<<(*it).second<<endl;

pair<mapcode::iterator,mapcode::iterator> range=codes.equal_range(718);
cout<<"cities with area code 718:\n";
for(it=range.first;it!=range.second;it++)
   cout<<(*it).second<<endl;




}

转载于:https://www.cnblogs.com/hqu-ye/archive/2013/02/23/2923454.html