标准模板5

#include<iostream>
#include<map>
#include<utility>
#include<string>
using namespace std;
int main()
{
multimap<string,string>courses;
typedef multimap<string,string>::iterator CourseIter;
courses.insert(make_pair("C++","2-6"));
courses.insert(make_pair("COMPILER","3-1"));
courses.insert(make_pair("COMPILER","5-2"));
courses.insert(make_pair("OS","1-2"));
courses.insert(make_pair("OS","4-1"));
courses.insert(make_pair("OS","5-5"));
string name;
int count;
do{
cin>>name;
count=courses.count(name);
if(count==0)
cout<<"Cannot find this course!"<<endl;
}while(count==0);
cout<<count<<" lession(s) per week: ";
auto range=courses.equal_range(name);
for(CourseIter iter=range.first;iter!=range.second;++iter)
cout<<iter->second<<" ";
cout<<endl;
return 0;
}