C++ map()和pair()用法

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#include <map> 
#include <iostream>
using namespace std;
int main( )
{
  map<int, int> m1;
  map<int, int>::iterator m1_Iter;
  //两种不同的插入方式,并用iterator迭代器来遍历打印.
  m1[0] = 10;
  m1[1] = 20;
  m1.insert(pair<int, int>(2, 20));
  m1.insert(pair<int, int>(3, 40));
  
  cout << "The original map m1 is:"<<endl;
  for(m1_Iter = m1.begin(); m1_Iter != m1.end(); m1_Iter++ )
    cout <<  m1_Iter->first<<" "<<m1_Iter->second<<endl;
  cout << endl;
  map<string, int> m2;
  map<string, int>::iterator m2_Iter;
  m2[string("张三")] = 1;
  m2[string("李四")] = 2;
  m2.insert(pair<string, int>(string("王朝"), 3));
  m2.insert(pair<string, int>(string("马汉"), 4));
  for(m2_Iter = m2.begin(); m2_Iter != m2.end(); m2_Iter++ )
    cout << m2_Iter->first<<" "<< m2_Iter->second<<endl;
  cout << endl;
  map<string, string> m3;
  map<string, string>::iterator m3_Iter;
  m3[string("张三")] = string("100");
  m3[string("李四")] = string("200");
  m3.insert(pair<string, string>(string("王朝"), string("300")));
  m3.insert(pair<string, string>(string("马汉"), string("400")));
  for(m3_Iter = m3.begin(); m3_Iter != m3.end(); m3_Iter++ )
    cout << m3_Iter->first<<" "<< m3_Iter->second<<endl;
}