stl map2

#include <stdio.h>
#include <map>
#include <iostream>
using namespace std;
// 用insert插入数据时，当map中有这个关键字时，insert是插入不了的数据的。
// 但用数组它可以覆盖以前关键字对应的值

int main( )
{
    map<int,string> stu,stu2;
    stu[1] = "boy1";
    stu[1] = "boy2";
    stu[2] = "boy3";
    map<int,string>::iterator iter;
    for ( iter = stu.begin(); iter != stu.end( ); iter++)
        cout<<iter->first<<" "<<iter->second<<endl;
    stu2.insert(pair<int,string>(1,"student_one"));
    stu2.insert(pair<int,string>(2,"student_two"));
    stu2.insert(pair<int,string>(2,"student_three"));
    puts("");
    for ( iter = stu2.begin(); iter != stu2.end( ); iter++)
        cout<<iter->first<<" "<<iter->second<<endl;
}