c++ map multimap操作

#include <iostream>
#include <map>
#include <string>

using namespace std;

int main()
{
　　map<int, string> map1;
　　multimap<int, string> multimap1;

　　map1.insert(map<int,string>::value_type(1,"One"));
　　map1.insert(map<int, string>::value_type(2, "Two"));
　　map1.insert(map<int, string>::value_type(3, "Three"));
　　map1.insert(make_pair(-1,"Minus One"));
　　map1.insert(pair<int,string>(1000,"Four"));
　　map1[100] = "Five";

　　cout << "map1 size:" << map1.size() << endl;
　　map<int, string>::const_iterator map_iter;
　　for (map_iter =map1.begin();map_iter !=map1.end();++map_iter)
　　{
　　　　cout << "key:" << map_iter->first << " value:" << map_iter->second.c_str() << endl;
　　}

　　cout << "---------------------------"<< endl;

　　multimap1.insert(multimap<int,string>::value_type(1,"One"));
　　multimap1.insert(multimap<int, string>::value_type(1, "One"));
　　multimap1.insert(multimap<int, string>::value_type(2, "Two"));
　　multimap1.insert(pair<int,string>(2,"Test"));
　　multimap1.insert(pair<int,string>(2,"Test2"));
　　multimap1.insert(make_pair<int,string>(3,"Test"));

　　cout << "multimap size:" << multimap1.size() << endl;
　　multimap<int, string>::const_iterator multimap_iter;
　　for (multimap_iter = multimap1.begin();multimap_iter != multimap1.end();++multimap_iter)
　　{
　　　　cout << "key:" << multimap_iter->first << " value:" << multimap_iter->second.c_str() << endl;
　　}

　　cout << "element count:" << multimap1.count(1) << endl;

　　cout << "-----------------------------------------" << endl;
　　multimap<int, string>::const_iterator iter2;
　　iter2 = multimap1.find(2);
　　if (iter2 != multimap1.end())
　　{
　　　　size_t element_count = multimap1.count(2);
　　　　for (int k=0;k<element_count;k++)
　　　　{
　　　　　　cout << "find: "<<k<<" " << iter2->first << " " << iter2->second.c_str() << endl;
　　　　　　++iter2;
　　　　}
　　　　
　　}
　　else
　　{
　　　　cout << "not found..." << endl;
　　}

　　cout << "---------------------------------------------"<<endl;
　　if (multimap1.erase(2)>0)
　　{
　　　　cout << "delete element success..."<<endl;
　　}
　　multimap<int, string>::const_iterator multimap_iter1;
　　for (multimap_iter1 = multimap1.begin(); multimap_iter1 != multimap1.end(); ++multimap_iter1)
　　{
　　　　cout << "key:" << multimap_iter1->first << " value:" << multimap_iter1->second.c_str() << endl;
　　}
　　cout << "---------------------------------------------" << endl;
　　multimap<int, string>::iterator iter3 = multimap1.find(1);
　　if (iter3 != multimap1.end())
　　{
　　　　size_t element_count = multimap1.count(1);
　　　　for (int k=0;k<element_count;k++)
　　　　{
　　　　　　iter3 = multimap1.find(1);
　　　　　　multimap1.erase(iter3);
　　　　　　//++iter3;
　　　　　　cout << "delete success..." << endl;
　　　　}
　　}
　　cout << "---------------------------------------------" << endl;
　　multimap<int, string>::const_iterator multimap_iter2;
　　for (multimap_iter2 = multimap1.begin(); multimap_iter2 != multimap1.end(); ++multimap_iter2)
　　{
　　　　cout << "key:" << multimap_iter2->first << " value:" << multimap_iter2->second.c_str() << endl;
　　}

　　system("pause");
　　return 0;
}

====================================== 

map1 size:6
key:-1 value:Minus One
key:1 value:One
key:2 value:Two
key:3 value:Three
key:100 value:Five
key:1000 value:Four
---------------------------
multimap size:6
key:1 value:One
key:1 value:One
key:2 value:Two
key:2 value:Test
key:2 value:Test2
key:3 value:Test
element count:2
-----------------------------------------
find: 0 2 Two
find: 1 2 Test
find: 2 2 Test2
---------------------------------------------
delete element success...
key:1 value:One
key:1 value:One
key:3 value:Test
---------------------------------------------
delete success...
delete success...
---------------------------------------------
key:3 value:Test
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