STL---map 和 multimap

#include <iostream>
#include <map>
#include <string>
using namespace std;
int main()
{
    multimap<string,string>mulmap;
    multimap<string,string>::iterator p;
    typedef multimap<string,string>::value_type vt;
    typedef string s;
    mulmap.insert(vt(s("Tom "),s("is a student")));
    mulmap.insert(vt(s("Tom "),s("is a boy")));
    mulmap.insert(vt(s("Tom "),s("is a bad boy of blue!")));
    mulmap.insert(vt(s("Jerry"),s(" is a student")));
    mulmap.insert(vt(s("Jerry "),s("is a beatutiful girl")));
    mulmap.insert(vt(s("DJ "),s("is a student")));
    //输出初始化以后的多重映射mulmap:
    for(p=mulmap.begin();p!=mulmap.end();++p)
        cout<<(*p).first<<(*p).second<<endl;
    //检索并输出Jerry键所对应的所有的值
    cout<<"find Jerry :"<<endl;
    p=mulmap.find(s("Jerry "));
    while((*p).first=="Jerry ")
    {
        cout<<(*p).first<<(*p).second<<endl;
        ++p;
    }
    return 0;
}

#include <iostream>
#include <map>
using namespace std;
int main()
{
    map<char,int> map1;
    map<char,int>::iterator mapIter;
    //char 是键的类型，int是值的类型
    //下面是初始化，与数组类似
    //也可以用map1.insert(map<char,int,less<char> >::value_type(''c'',3));
    map1['c']=3;
    map1['z']=4;
    map1['a']=1;
    map1['k']=2;
    for(mapIter=map1.begin();mapIter!=map1.end();++mapIter)
        cout<<" "<<(*mapIter).first<<": "<<(*mapIter).second;
    //first对应定义中的char键，second对应定义中的int值
    //检索对应于d键的值是这样做的：
    map<char,int>::iterator ptr;
    ptr=map1.find('k');
    cout<<'\n'<<" "<<(*ptr).first<<" 键对应于值："<<(*ptr).second;
    return 0;
}